com.google.gwt.dev.util.StringCopier Maven / Gradle / Ivy
/*
* Copyright 2006 Google Inc.
*
* 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.google.gwt.dev.util;
import java.io.CharArrayWriter;
import java.nio.BufferOverflowException;
import java.nio.BufferUnderflowException;
/**
* Utility class for directly modifying a character array.
*/
public class StringCopier {
private final CharArrayWriter out = new CharArrayWriter();
private final char[] in;
private int inPos = 0;
public StringCopier(char[] in) {
this.in = in;
}
public void commit(char[] replaceWith, int startReplace, int endReplace) {
if (startReplace < inPos) {
throw new BufferUnderflowException();
}
if (endReplace > in.length) {
throw new BufferOverflowException();
}
// commit any characters up to the beginning of the replacement
out.write(in, inPos, startReplace - inPos);
// commit the replacement
out.write(replaceWith, 0, replaceWith.length);
// skip over the replaced characters
inPos = endReplace;
}
public char[] finish() {
// commit any uncommitted characters
out.write(in, inPos, in.length - inPos);
inPos = in.length;
return out.toCharArray();
}
}