001/* 
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.rendering.wiki.extensions;
023
024import java.util.regex.Matcher;
025import java.util.regex.Pattern;
026
027import org.nuxeo.common.xmap.annotation.XNode;
028import org.nuxeo.common.xmap.annotation.XObject;
029import org.nuxeo.ecm.platform.rendering.wiki.WikiFilter;
030
031/**
032 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
033 */
034@XObject("filter")
035public class PatternFilter implements WikiFilter {
036
037    @XNode("pattern")
038    protected Pattern pattern;
039
040    @XNode("replacement")
041    protected String replacement;
042
043    public PatternFilter(String pattern, String replacement) {
044        this.pattern = Pattern.compile(pattern);
045        this.replacement = replacement;
046    }
047
048    public String apply(String content) {
049        Matcher matcher = pattern.matcher(content);
050        if (!matcher.find()) {
051            return null;
052        }
053        StringBuffer sb = new StringBuffer();
054        do {
055            matcher.appendReplacement(sb, replacement);
056        } while (matcher.find());
057        matcher.appendTail(sb);
058        return sb.toString();
059    }
060
061}