/*
* © Copyright IBM Corp. 2012-2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.ibm.commons.util.io;
import java.io.IOException;
import java.io.Reader;
/**
* Fast buffered reader.
* <p>
* This implementation is faster than the standard BufferedReader
* </p>
* @ibm-api
*/
public class FastStringReader extends Reader {
private String s;
private int pos;
private int length;
/** @ibm-api */
public FastStringReader(String s) {
this.s = s;
this.length = s.length();
}
/** @ibm-api */
public int read() throws IOException {
if(pos<length) {
return s.charAt(pos++);
}
return -1;
}
/** @ibm-api */
public int read(char cbuf[], int off, int len) throws IOException {
if(pos<length) {
int count = Math.min(len,length-pos);
s.getChars(pos, pos+count, cbuf, off);
pos += count;
return count;
}
return -1;
}
/** @ibm-api */
public long skip(long n) throws IOException {
int skip = Math.min(pos+(int)n,length)-pos;
pos += skip;
return skip;
}
/** @ibm-api */
public boolean ready() throws IOException {
return true;
}
/** @ibm-api */
public void close() throws java.io.IOException {
// Nothing here...
}
}