package com.sun.opends.sdk.util;
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/**
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* Created by IntelliJ IDEA.
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* User: boli
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* Date: Jul 13, 2009
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* Time: 3:11:50 PM
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* To change this template use File | Settings | File Templates.
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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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