com.liferay.portal.kernel.util.CallbackMatcher Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.portal.kernel.util;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* See https://issues.liferay.com/browse/LPS-6872.
*
*
* @author Jonathan Potter
*/
public class CallbackMatcher {
public String replaceMatches(CharSequence charSequence, Callback callback) {
Matcher matcher = _pattern.matcher(charSequence);
StringBuilder sb = new StringBuilder(charSequence);
int offset = 0;
while (matcher.find()) {
MatchResult matchResult = matcher.toMatchResult();
String replacement = callback.foundMatch(matchResult);
if (replacement == null) {
continue;
}
int matchStart = offset + matchResult.start();
int matchEnd = offset + matchResult.end();
sb.replace(matchStart, matchEnd, replacement);
int matchLength = matchResult.end() - matchResult.start();
int lengthChange = replacement.length() - matchLength;
offset += lengthChange;
}
return sb.toString();
}
public void setRegex(String regex) {
_pattern = Pattern.compile(regex);
}
public interface Callback {
public String foundMatch(MatchResult matchResult);
}
private Pattern _pattern;
}