/*
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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 com.sun.opends.sdk.util;
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/**
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* A sub-string reader.
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*/
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public class SubstringReader
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{
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private String source;
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private int pos;
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private int mark;
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public SubstringReader(String s) {
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Validator.ensureNotNull(s);
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source = s;
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pos = 0;
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mark = 0;
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}
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/**
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* Attemps to read a substring of the specified length.
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*
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* @param length The number of characters to read.
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* @return The substring.
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*/
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public String read(int length)
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{
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String substring = source.substring(pos, pos + length);
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pos += length;
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return substring;
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}
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public char read()
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{
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return source.charAt(pos++);
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}
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public String getString()
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{
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return source;
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}
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public int pos()
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{
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return pos;
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}
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public int remaining()
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{
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return source.length() - pos;
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}
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/**
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* Marks the present position in the stream. Subsequent calls
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* to reset() will reposition the stream to this point.
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*/
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public void mark()
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{
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mark = pos;
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}
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/**
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* Resets the stream to the most recent mark, or to the beginning
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* of the string if it has never been marked.
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*/
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public void reset()
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{
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pos = mark;
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}
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public int skipWhitespaces()
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{
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int skipped = 0;
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while(pos < source.length() && source.charAt(pos) == ' ')
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{
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skipped++;
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pos++;
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}
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return skipped;
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}
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}
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