001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.extensions.markup.html.basic; 018 019import java.util.HashMap; 020import java.util.Map; 021import java.util.regex.Matcher; 022import java.util.regex.Pattern; 023 024import org.apache.wicket.util.string.Strings; 025 026 027/** 028 * This base implementation iterates over all provided <code>ILinkRenderStrategy</code> 029 * implementations and applies them to the input text. 030 * 031 * @author Gerolf Seitz 032 */ 033public class LinkParser implements ILinkParser 034{ 035 private final Map<Pattern, ILinkRenderStrategy> renderStrategies = new HashMap<>(); 036 037 /** 038 * Adds a render strategy to the parser. 039 * 040 * @param pattern 041 * the pattern to which the provided <code>renderStrategy</code> should be applied. 042 * @param renderStrategy 043 * the <code>ILinkRenderStrategy</code> which is applied to the text found by the 044 * provided <code>pattern</code>. 045 * @return this <code>ILinkParser</code>. 046 */ 047 public ILinkParser addLinkRenderStrategy(final String pattern, 048 final ILinkRenderStrategy renderStrategy) 049 { 050 final Pattern compiledPattern = Pattern.compile(pattern, Pattern.DOTALL); 051 renderStrategies.put(compiledPattern, renderStrategy); 052 return this; 053 } 054 055 /** 056 * @see ILinkParser#parse(String) 057 */ 058 @Override 059 public String parse(final String text) 060 { 061 if (Strings.isEmpty(text)) 062 { 063 return text; 064 } 065 066 String work = text; 067 068 // don't try to parse markup. just plain text. WICKET-4099 069 if (work.indexOf('<') == -1) 070 { 071 for (Map.Entry<Pattern, ILinkRenderStrategy> entry : renderStrategies.entrySet()) 072 { 073 Pattern pattern = entry.getKey(); 074 ILinkRenderStrategy strategy = entry.getValue(); 075 076 Matcher matcher = pattern.matcher(work); 077 StringBuffer buffer = new StringBuffer(); 078 while (matcher.find()) 079 { 080 String str = matcher.group(); 081 matcher.appendReplacement(buffer, strategy.buildLink(str)); 082 } 083 matcher.appendTail(buffer); 084 work = buffer.toString(); 085 } 086 } 087 return work; 088 } 089}