/*
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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 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.sdk.asn1;
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import static com.sun.opends.sdk.util.Messages.*;
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import static org.opends.sdk.asn1.ASN1Constants.*;
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import java.io.IOException;
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import org.opends.sdk.DecodeException;
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import org.opends.sdk.util.ByteString;
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import org.opends.sdk.util.ByteStringBuilder;
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import com.sun.opends.sdk.util.Message;
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/**
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* An abstract {@code ASN1Reader} which can be used as the basis for
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* implementing new ASN1 reader implementations.
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*/
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public abstract class AbstractASN1Reader implements ASN1Reader
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{
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/**
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* Creates a new abstract ASN.1 reader.
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*/
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protected AbstractASN1Reader()
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{
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// No implementation required.
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}
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/**
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* {@inheritDoc}
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*/
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public boolean readBoolean(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_BOOLEAN_TYPE;
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}
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checkType(type);
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return readBoolean();
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}
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/**
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* {@inheritDoc}
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*/
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public int readEnumerated(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_ENUMERATED_TYPE;
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}
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checkType(type);
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return readEnumerated();
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}
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/**
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* {@inheritDoc}
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*/
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public long readInteger(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_INTEGER_TYPE;
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}
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checkType(type);
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return readInteger();
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}
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/**
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* {@inheritDoc}
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*/
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public void readNull(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_NULL_TYPE;
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}
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checkType(type);
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readNull();
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}
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/**
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* {@inheritDoc}
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*/
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public ByteString readOctetString(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_OCTET_STRING_TYPE;
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}
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checkType(type);
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return readOctetString();
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}
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/**
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* {@inheritDoc}
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*/
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public ByteStringBuilder readOctetString(byte type,
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ByteStringBuilder builder) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_OCTET_STRING_TYPE;
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}
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checkType(type);
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readOctetString(builder);
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return builder;
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}
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/**
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* {@inheritDoc}
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*/
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public String readOctetStringAsString(byte type) throws IOException
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{
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// We could cache the UTF-8 CharSet if performance proves to be an
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// issue.
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if (type == 0x00)
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{
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type = UNIVERSAL_OCTET_STRING_TYPE;
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}
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checkType(type);
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return readOctetStringAsString();
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}
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/**
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* {@inheritDoc}
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*/
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public void readStartSequence(byte type) throws IOException
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{
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if (type == 0x00)
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{
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type = UNIVERSAL_SEQUENCE_TYPE;
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}
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checkType(type);
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readStartSequence();
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}
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/**
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* {@inheritDoc}
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*/
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public void readStartSet(byte type) throws IOException
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{
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// From an implementation point of view, a set is equivalent to a
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// sequence.
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if (type == 0x00)
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{
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type = UNIVERSAL_SET_TYPE;
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}
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checkType(type);
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readStartSet();
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}
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private void checkType(byte expectedType) throws IOException
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{
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if (peekType() != expectedType)
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{
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Message message = ERR_ASN1_UNEXPECTED_TAG.get(expectedType,
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peekType());
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throw DecodeException.fatalError(message);
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}
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}
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}
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