/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009 Sun Microsystems, Inc.
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*/
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package org.opends.sdk.util;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.ByteBuffer;
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import java.util.logging.Level;
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/**
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* A mutable sequence of bytes backed by a byte array.
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*/
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public final class ByteStringBuilder implements ByteSequence
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{
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/**
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* A sub-sequence of the parent byte string builder. The sub-sequence
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* will be robust against all updates to the byte string builder
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* except for invocations of the method {@code clear()}.
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*/
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private final class SubSequence implements ByteSequence
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{
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// The length of the sub-sequence.
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private final int subLength;
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// The offset of the sub-sequence.
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private final int subOffset;
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/**
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* Creates a new sub-sequence.
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*
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* @param offset
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* The offset of the sub-sequence.
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* @param length
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* The length of the sub-sequence.
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*/
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private SubSequence(int offset, int length)
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{
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this.subOffset = offset;
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this.subLength = length;
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}
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/**
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* {@inheritDoc}
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*/
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public ByteSequenceReader asReader()
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{
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return new ByteSequenceReader(this);
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}
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/**
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* {@inheritDoc}
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*/
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public byte byteAt(int index) throws IndexOutOfBoundsException
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{
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if (index >= subLength || index < 0)
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{
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throw new IndexOutOfBoundsException();
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}
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// Protect against reallocation: use builder's buffer.
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return buffer[subOffset + index];
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}
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/**
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* {@inheritDoc}
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*/
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public int compareTo(byte[] b, int offset, int length)
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throws IndexOutOfBoundsException
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{
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ByteString.checkArrayBounds(b, offset, length);
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// Protect against reallocation: use builder's buffer.
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return ByteString.compareTo(buffer, subOffset, subLength, b,
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offset, length);
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}
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/**
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* {@inheritDoc}
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*/
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public int compareTo(ByteSequence o)
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{
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if (this == o)
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{
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return 0;
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}
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// Protect against reallocation: use builder's buffer.
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return -o.compareTo(buffer, subOffset, subLength);
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}
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/**
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* {@inheritDoc}
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*/
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public byte[] copyTo(byte[] b)
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{
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copyTo(b, 0);
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return b;
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}
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/**
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* {@inheritDoc}
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*/
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public byte[] copyTo(byte[] b, int offset)
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throws IndexOutOfBoundsException
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{
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if (offset < 0)
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{
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throw new IndexOutOfBoundsException();
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}
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// Protect against reallocation: use builder's buffer.
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System.arraycopy(buffer, subOffset, b, offset, Math.min(
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subLength, b.length - offset));
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return b;
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}
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/**
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* {@inheritDoc}
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*/
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public ByteStringBuilder copyTo(ByteStringBuilder builder)
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{
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// Protect against reallocation: use builder's buffer.
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return builder.append(buffer, subOffset, subLength);
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}
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/**
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* {@inheritDoc}
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*/
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public OutputStream copyTo(OutputStream stream) throws IOException
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{
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// Protect against reallocation: use builder's buffer.
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stream.write(buffer, subOffset, subLength);
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return stream;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean equals(byte[] b, int offset, int length)
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throws IndexOutOfBoundsException
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{
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ByteString.checkArrayBounds(b, offset, length);
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// Protect against reallocation: use builder's buffer.
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return ByteString.equals(buffer, subOffset, subLength, b, offset,
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length);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean equals(Object o)
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{
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if (this == o)
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{
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return true;
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}
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else if (o instanceof ByteSequence)
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{
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final ByteSequence other = (ByteSequence) o;
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// Protect against reallocation: use builder's buffer.
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return other.equals(buffer, subOffset, subLength);
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}
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else
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{
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return false;
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int hashCode()
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{
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// Protect against reallocation: use builder's buffer.
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return ByteString.hashCode(buffer, subOffset, subLength);
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}
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/**
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* {@inheritDoc}
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*/
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public int length()
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{
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return subLength;
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}
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/**
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* {@inheritDoc}
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*/
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public ByteSequence subSequence(int start, int end)
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throws IndexOutOfBoundsException
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{
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if (start < 0 || start > end || end > subLength)
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{
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throw new IndexOutOfBoundsException();
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}
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return new SubSequence(subOffset + start, end - start);
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}
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/**
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* {@inheritDoc}
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*/
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public byte[] toByteArray()
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{
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return copyTo(new byte[subLength]);
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}
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/**
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* {@inheritDoc}
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*/
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public ByteString toByteString()
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{
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// Protect against reallocation: use builder's buffer.
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final byte[] b = new byte[subLength];
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System.arraycopy(buffer, subOffset, b, 0, subLength);
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return ByteString.wrap(b);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString()
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{
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// Protect against reallocation: use builder's buffer.
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return ByteString.toString(buffer, subOffset, subLength);
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}
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}
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// These are package private so that compression and crypto
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// functionality may directly access the fields.
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// The buffer where data is stored.
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byte[] buffer;
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// The number of bytes to expose from the buffer.
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int length;
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/**
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* Creates a new byte string builder with an initial capacity of 32
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* bytes.
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*/
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public ByteStringBuilder()
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{
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// Initially create a 32 byte buffer.
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this(32);
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}
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/**
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* Creates a new byte string builder with the specified initial
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* capacity.
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*
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* @param capacity
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* The initial capacity.
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* @throws IllegalArgumentException
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* If the {@code capacity} is negative.
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*/
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public ByteStringBuilder(int capacity)
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throws IllegalArgumentException
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{
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if (capacity < 0)
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{
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throw new IllegalArgumentException();
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}
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this.buffer = new byte[capacity];
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this.length = 0;
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}
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/**
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* Appends the provided byte to this byte string builder.
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*
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* @param b
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* The byte to be appended to this byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(byte b)
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{
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ensureAdditionalCapacity(1);
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buffer[length++] = b;
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return this;
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}
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/**
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* Appends the provided byte array to this byte string builder.
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* <p>
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* An invocation of the form:
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*
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* <pre>
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* src.append(b)
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* </pre>
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*
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* Behaves in exactly the same way as the invocation:
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*
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* <pre>
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* src.append(b, 0, b.length);
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* </pre>
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*
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* @param b
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* The byte array to be appended to this byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(byte[] b)
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{
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return append(b, 0, b.length);
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}
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/**
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* Appends the provided byte array to this byte string builder.
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*
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* @param b
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* The byte array to be appended to this byte string builder.
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* @param offset
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* The offset of the byte array to be used; must be
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* non-negative and no larger than {@code b.length} .
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* @param length
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* The length of the byte array to be used; must be
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* non-negative and no larger than {@code b.length - offset}.
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* @return This byte string builder.
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* @throws IndexOutOfBoundsException
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* If {@code offset} is negative or if {@code length} is
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* negative or if {@code offset + length} is greater than
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* {@code b.length}.
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*/
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public ByteStringBuilder append(byte[] b, int offset, int length)
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throws IndexOutOfBoundsException
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{
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ByteString.checkArrayBounds(b, offset, length);
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if (length != 0)
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{
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ensureAdditionalCapacity(length);
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System.arraycopy(b, offset, buffer, this.length, length);
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this.length += length;
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}
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return this;
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}
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/**
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* Appends the provided {@code ByteBuffer} to this byte string
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* builder.
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*
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* @param buffer
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* The byte buffer to be appended to this byte string
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* builder.
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* @param length
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* The number of bytes to be appended from {@code buffer}.
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* @return This byte string builder.
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* @throws IndexOutOfBoundsException
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* If {@code length} is less than zero or greater than
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* {@code buffer.remaining()}.
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*/
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public ByteStringBuilder append(ByteBuffer buffer, int length)
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throws IndexOutOfBoundsException
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{
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if (length < 0 || length > buffer.remaining())
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{
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throw new IndexOutOfBoundsException();
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}
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if (length != 0)
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{
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ensureAdditionalCapacity(length);
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buffer.get(this.buffer, this.length, length);
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this.length += length;
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}
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return this;
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}
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/**
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* Appends the provided {@link ByteSequence} to this byte string
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* builder.
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*
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* @param bytes
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* The byte sequence to be appended to this byte string
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* builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(ByteSequence bytes)
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{
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return bytes.copyTo(this);
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}
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/**
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* Appends the provided {@link ByteSequenceReader} to this byte string
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* builder.
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*
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* @param reader
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* The byte sequence reader to be appended to this byte
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* string builder.
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* @param length
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* The number of bytes to be appended from {@code reader}.
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* @return This byte string builder.
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* @throws IndexOutOfBoundsException
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* If {@code length} is less than zero or greater than
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* {@code reader.remaining()}.
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*/
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public ByteStringBuilder append(ByteSequenceReader reader, int length)
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throws IndexOutOfBoundsException
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{
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if (length < 0 || length > reader.remaining())
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{
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throw new IndexOutOfBoundsException();
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}
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if (length != 0)
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{
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ensureAdditionalCapacity(length);
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reader.get(buffer, this.length, length);
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this.length += length;
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}
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return this;
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}
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/**
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* Appends the provided {@code InputStream} to this byte string
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* builder.
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*
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* @param stream
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* The input stream to be appended to this byte string
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* builder.
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* @param length
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* The maximum number of bytes to be appended from {@code
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* buffer}.
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* @return The number of bytes read from the input stream, or {@code
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* -1} if the end of the input stream has been reached.
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* @throws IndexOutOfBoundsException
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* If {@code length} is less than zero.
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* @throws IOException
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* If an I/O error occurs.
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*/
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public int append(InputStream stream, int length)
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throws IndexOutOfBoundsException, IOException
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{
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if (length < 0)
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{
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throw new IndexOutOfBoundsException();
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}
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ensureAdditionalCapacity(length);
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final int bytesRead = stream.read(buffer, this.length, length);
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if (bytesRead > 0)
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{
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this.length += bytesRead;
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}
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return bytesRead;
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}
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/**
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* Appends the big-endian encoded bytes of the provided integer to
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* this byte string builder.
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*
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* @param i
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* The integer whose big-endian encoding is to be appended to
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* this byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(int i)
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{
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ensureAdditionalCapacity(4);
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for (int j = length + 3; j >= length; j--)
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{
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buffer[j] = (byte) (i & 0xFF);
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i >>>= 8;
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}
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length += 4;
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return this;
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}
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/**
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* Appends the big-endian encoded bytes of the provided long to this
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* byte string builder.
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*
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* @param l
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* The long whose big-endian encoding is to be appended to
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* this byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(long l)
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{
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ensureAdditionalCapacity(8);
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for (int i = length + 7; i >= length; i--)
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{
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buffer[i] = (byte) (l & 0xFF);
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l >>>= 8;
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}
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length += 8;
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return this;
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}
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|
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/**
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* Appends the big-endian encoded bytes of the provided short to this
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* byte string builder.
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*
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* @param i
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* The short whose big-endian encoding is to be appended to
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* this byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(short i)
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{
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ensureAdditionalCapacity(2);
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for (int j = length + 1; j >= length; j--)
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{
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buffer[j] = (byte) (i & 0xFF);
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i >>>= 8;
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}
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length += 2;
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return this;
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}
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|
|
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/**
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* Appends the UTF-8 encoded bytes of the provided string to this byte
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* string builder.
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*
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* @param s
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* The string whose UTF-8 encoding is to be appended to this
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* byte string builder.
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* @return This byte string builder.
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*/
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public ByteStringBuilder append(String s)
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{
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if (s == null)
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{
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return this;
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}
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// Assume that each char is 1 byte
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final int len = s.length();
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ensureAdditionalCapacity(len);
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for (int i = 0; i < len; i++)
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{
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final char c = s.charAt(i);
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final byte b = (byte) (c & 0x0000007F);
|
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if (c == b)
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{
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buffer[this.length + i] = b;
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}
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else
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{
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// There is a multi-byte char. Defer to JDK
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try
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{
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return append(s.getBytes("UTF-8"));
|
}
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catch (final Exception e)
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{
|
if (StaticUtils.DEBUG_LOG.isLoggable(Level.WARNING))
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{
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StaticUtils.DEBUG_LOG.warning("Unable to encode String "
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+ "to UTF-8 bytes: " + e.toString());
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}
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return append(s.getBytes());
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}
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}
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}
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// The 1 byte char assumption was correct
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this.length += len;
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return this;
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}
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|
|
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/**
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* Appends the ASN.1 BER length encoding representation of the
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* provided integer to this byte string builder.
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*
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* @param length
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* The value to encode using the BER length encoding rules.
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* @return This byte string builder.
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*/
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public ByteStringBuilder appendBERLength(int length)
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{
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if ((length & 0x0000007F) == length)
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{
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ensureAdditionalCapacity(1);
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buffer[this.length++] = (byte) (length & 0xFF);
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}
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else if ((length & 0x000000FF) == length)
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{
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ensureAdditionalCapacity(2);
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buffer[this.length++] = (byte) 0x81;
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buffer[this.length++] = (byte) (length & 0xFF);
|
}
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else if ((length & 0x0000FFFF) == length)
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{
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ensureAdditionalCapacity(3);
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buffer[this.length++] = (byte) 0x82;
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buffer[this.length++] = (byte) (length >> 8 & 0xFF);
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buffer[this.length++] = (byte) (length & 0xFF);
|
}
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else if ((length & 0x00FFFFFF) == length)
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{
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ensureAdditionalCapacity(4);
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buffer[this.length++] = (byte) 0x83;
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buffer[this.length++] = (byte) (length >> 16 & 0xFF);
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buffer[this.length++] = (byte) (length >> 8 & 0xFF);
|
buffer[this.length++] = (byte) (length & 0xFF);
|
}
|
else
|
{
|
ensureAdditionalCapacity(5);
|
|
buffer[this.length++] = (byte) 0x84;
|
buffer[this.length++] = (byte) (length >> 24 & 0xFF);
|
buffer[this.length++] = (byte) (length >> 16 & 0xFF);
|
buffer[this.length++] = (byte) (length >> 8 & 0xFF);
|
buffer[this.length++] = (byte) (length & 0xFF);
|
}
|
return this;
|
}
|
|
|
|
/**
|
* Returns a {@link ByteSequenceReader} which can be used to
|
* incrementally read and decode data from this byte string builder.
|
* <p>
|
* <b>NOTE:</b> all concurrent updates to this byte string builder are
|
* supported with the exception of {@link #clear()}. Any invocations
|
* of {@link #clear()} must be accompanied by a subsequent call to
|
* {@code ByteSequenceReader.rewind()}.
|
*
|
* @return The {@link ByteSequenceReader} which can be used to
|
* incrementally read and decode data from this byte string
|
* builder.
|
* @see #clear()
|
*/
|
public ByteSequenceReader asReader()
|
{
|
return new ByteSequenceReader(this);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public byte byteAt(int index) throws IndexOutOfBoundsException
|
{
|
if (index >= length || index < 0)
|
{
|
throw new IndexOutOfBoundsException();
|
}
|
return buffer[index];
|
}
|
|
|
|
/**
|
* Sets the length of this byte string builder to zero.
|
* <p>
|
* <b>NOTE:</b> if this method is called, then {@code
|
* ByteSequenceReader.rewind()} must also be called on any associated
|
* byte sequence readers in order for them to remain valid.
|
*
|
* @return This byte string builder.
|
* @see #asReader()
|
*/
|
public ByteStringBuilder clear()
|
{
|
length = 0;
|
return this;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public int compareTo(byte[] b, int offset, int length)
|
throws IndexOutOfBoundsException
|
{
|
ByteString.checkArrayBounds(b, offset, length);
|
return ByteString.compareTo(this.buffer, 0, this.length, b, offset,
|
length);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public int compareTo(ByteSequence o)
|
{
|
if (this == o)
|
{
|
return 0;
|
}
|
return -o.compareTo(buffer, 0, length);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public byte[] copyTo(byte[] b)
|
{
|
copyTo(b, 0);
|
return b;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public byte[] copyTo(byte[] b, int offset)
|
throws IndexOutOfBoundsException
|
{
|
if (offset < 0)
|
{
|
throw new IndexOutOfBoundsException();
|
}
|
System.arraycopy(buffer, 0, b, offset, Math.min(length, b.length
|
- offset));
|
return b;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public ByteStringBuilder copyTo(ByteStringBuilder builder)
|
{
|
builder.append(buffer, 0, length);
|
return builder;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public OutputStream copyTo(OutputStream stream) throws IOException
|
{
|
stream.write(buffer, 0, length);
|
return stream;
|
}
|
|
|
|
/**
|
* Ensures that the specified number of additional bytes will fit in
|
* this byte string builder and resizes it if necessary.
|
*
|
* @param size
|
* The number of additional bytes.
|
* @return This byte string builder.
|
*/
|
public ByteStringBuilder ensureAdditionalCapacity(int size)
|
{
|
final int newCount = this.length + size;
|
if (newCount > buffer.length)
|
{
|
final byte[] newbuffer =
|
new byte[Math.max(buffer.length << 1, newCount)];
|
System.arraycopy(buffer, 0, newbuffer, 0, buffer.length);
|
buffer = newbuffer;
|
}
|
return this;
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean equals(byte[] b, int offset, int length)
|
throws IndexOutOfBoundsException
|
{
|
ByteString.checkArrayBounds(b, offset, length);
|
return ByteString.equals(this.buffer, 0, this.length, b, offset,
|
length);
|
}
|
|
|
|
/**
|
* Indicates whether the provided object is equal to this byte string
|
* builder. In order for it to be considered equal, the provided
|
* object must be a byte sequence containing the same bytes in the
|
* same order.
|
*
|
* @param o
|
* The object for which to make the determination.
|
* @return {@code true} if the provided object is a byte sequence
|
* whose content is equal to that of this byte string builder,
|
* or {@code false} if not.
|
*/
|
@Override
|
public boolean equals(Object o)
|
{
|
if (this == o)
|
{
|
return true;
|
}
|
else if (o instanceof ByteSequence)
|
{
|
final ByteSequence other = (ByteSequence) o;
|
return other.equals(buffer, 0, length);
|
}
|
else
|
{
|
return false;
|
}
|
}
|
|
|
|
/**
|
* Returns the byte array that backs this byte string builder.
|
* Modifications to this byte string builder's content may cause the
|
* returned array's content to be modified, and vice versa.
|
* <p>
|
* Note that the length of the returned array is only guaranteed to be
|
* the same as the length of this byte string builder immediately
|
* after a call to {@link #trimToSize()}.
|
* <p>
|
* In addition, subsequent modifications to this byte string builder
|
* may cause the backing byte array to be reallocated thus decoupling
|
* the returned byte array from this byte string builder.
|
*
|
* @return The byte array that backs this byte string builder.
|
*/
|
public byte[] getBackingArray()
|
{
|
return buffer;
|
}
|
|
|
|
/**
|
* Returns a hash code for this byte string builder. It will be the
|
* sum of all of the bytes contained in the byte string builder.
|
* <p>
|
* <b>NOTE:</b> subsequent changes to this byte string builder will
|
* invalidate the returned hash code.
|
*
|
* @return A hash code for this byte string builder.
|
*/
|
@Override
|
public int hashCode()
|
{
|
return ByteString.hashCode(buffer, 0, length);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public int length()
|
{
|
return length;
|
}
|
|
|
|
/**
|
* Sets the length of this byte string builder.
|
* <p>
|
* If the <code>newLength</code> argument is less than the current
|
* length, the length is changed to the specified length.
|
* <p>
|
* If the <code>newLength</code> argument is greater than or equal to
|
* the current length, then the capacity is increased and sufficient
|
* null bytes are appended so that length becomes the
|
* <code>newLength</code> argument.
|
* <p>
|
* The <code>newLength</code> argument must be greater than or equal
|
* to <code>0</code>.
|
*
|
* @param newLength
|
* The new length.
|
* @return This byte string builder.
|
* @throws IndexOutOfBoundsException
|
* If the <code>newLength</code> argument is negative.
|
*/
|
public ByteStringBuilder setLength(int newLength)
|
{
|
if (newLength < 0)
|
{
|
throw new IndexOutOfBoundsException("Negative newLength: "
|
+ newLength);
|
}
|
|
if (newLength > length)
|
{
|
ensureAdditionalCapacity(newLength - length);
|
|
// Pad with zeros.
|
for (int i = length; i < newLength; i++)
|
{
|
buffer[i] = 0;
|
}
|
}
|
length = newLength;
|
|
return this;
|
}
|
|
|
|
/**
|
* Returns a new byte sequence that is a subsequence of this byte
|
* sequence.
|
* <p>
|
* The subsequence starts with the byte value at the specified {@code
|
* start} index and ends with the byte value at index {@code end - 1}.
|
* The length (in bytes) of the returned sequence is {@code end -
|
* start}, so if {@code start == end} then an empty sequence is
|
* returned.
|
* <p>
|
* <b>NOTE:</b> the returned sub-sequence will be robust against all
|
* updates to the byte string builder except for invocations of the
|
* method {@link #clear()}. If a permanent immutable byte sequence is
|
* required then callers should invoke {@code toByteString()} on the
|
* returned byte sequence.
|
*
|
* @param start
|
* The start index, inclusive.
|
* @param end
|
* The end index, exclusive.
|
* @return The newly created byte subsequence.
|
* @throws IndexOutOfBoundsException
|
* If {@code start} or {@code end} are negative, if {@code
|
* end} is greater than {@code length()}, or if {@code
|
* start} is greater than {@code end}.
|
*/
|
public ByteSequence subSequence(int start, int end)
|
throws IndexOutOfBoundsException
|
{
|
if (start < 0 || start > end || end > length)
|
{
|
throw new IndexOutOfBoundsException();
|
}
|
|
return new SubSequence(start, end - start);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public byte[] toByteArray()
|
{
|
return copyTo(new byte[length]);
|
}
|
|
|
|
/**
|
* Returns the {@link ByteString} representation of this byte string
|
* builder. Subsequent changes to this byte string builder will not
|
* modify the returned {@link ByteString}.
|
*
|
* @return The {@link ByteString} representation of this byte
|
* sequence.
|
*/
|
public ByteString toByteString()
|
{
|
final byte[] b = new byte[length];
|
System.arraycopy(buffer, 0, b, 0, length);
|
return ByteString.wrap(b);
|
}
|
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
return ByteString.toString(buffer, 0, length);
|
}
|
|
|
|
/**
|
* Attempts to reduce storage used for this byte string builder. If
|
* the buffer is larger than necessary to hold its current sequence of
|
* bytes, then it may be resized to become more space efficient.
|
*
|
* @return This byte string builder.
|
*/
|
public ByteStringBuilder trimToSize()
|
{
|
if (buffer.length > length)
|
{
|
final byte[] newBuffer = new byte[length];
|
System.arraycopy(buffer, 0, newBuffer, 0, length);
|
buffer = newBuffer;
|
}
|
return this;
|
}
|
}
|
