/*
* Copyright (c) 2008-2010 by Bjoern Kolbeck, Jan Stender,
* Zuse Institute Berlin
*
* Licensed under the BSD License, see LICENSE file for details.
*
*/
package de.mxro.thrd.xstreemfs.foundation.json;
/**
* This class is necessary because the StringReader cannot skip back once the
* end is reached.
*
* @author bjko
*/
public class JSONString implements JSONInput {
String str;
int position;
/**
* Creates a new instance of JSONString
*
* @param str
* the JSON message
*/
public JSONString(String str) {
this.str = str;
position = 0;
}
/**
* reads a single char
*
* @return the character at the current position is returned
*/
public char read() throws JSONException {
try {
return str.charAt(position++);
}
catch (StringIndexOutOfBoundsException ex) {
throw new JSONException("Reach the end of the string");
}
}
/**
*/
public boolean hasMore() {
return position < str.length();
}
/**
* Skips skip characters
*
* @param skip
* num characters to skip
* @return the number of characters skipped
*/
public int skip(int skip) {
if (((position + skip) < 0) || ((position + skip) >= str.length())) {
return 0;
} else {
position = position + skip;
return skip;
}
}
/**
* Get a string representation.
*
* @return A string representation of the this JSONString.
*/
public String toString() {
return "JSONString pos=" + position + " str=" + str;
}
}