001 /*
002 * Copyright 1999,2004 The Apache Software Foundation.
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 package org.apache.commons.feedparser.locate;
017
018 import java.util.HashMap;
019
020 /**
021 *
022 * Given a string of HTML content, parse out anchors and fire events with all
023 * the data when they are found.
024 *
025 * @author <a href="mailto:burton@openprivacy.org">Kevin A. Burton</a>
026 */
027 public class AnchorParser {
028
029 public static void parse( String content,
030 AnchorParserListener listener )
031 throws AnchorParserException {
032
033 //FIXME: we do NOT obey base right now and this is a BIG problem!
034
035 parseAnchors( content, listener );
036
037 }
038
039 /**
040 * Get links from the given html with included titles and other metainfo.
041 *
042 * @deprecated use HTParser
043 *
044 */
045 public static void parseAnchors( String content,
046 AnchorParserListener listener )
047 throws AnchorParserException {
048
049 int index = 0;
050 int begin = 0;
051 int end = 0;
052
053 //FIXME: what if there are HTML comments here? We would parse links
054 //within comments which isn't what we want.
055
056 // FIXME: how do we pass back the content of the href?
057 //
058 // <a href=''> this is the content </a>
059 //
060 // which would pass a string "this is the content"
061
062 //Matcher m = pattern.matcher( content );
063
064 while ( (begin = content.indexOf( "<a", index )) != -1 ) {
065
066 index = begin;
067
068 end = content.indexOf( "</a>", index );
069 if ( end == -1 )
070 break;
071 index = end + 1;
072
073 String match = content.substring( begin, end );
074
075 HashMap map = DiscoveryLocator.getAttributes( match );
076 //String resource = EntityDecoder.decode( m.group( 1 ) );
077
078 //FIXME: we SHOULD be using this but its not working right now.
079 String resource = (String)map.get( "href" );
080
081 if ( resource == null || resource.equals( "" ) ) {
082 continue;
083 }
084
085 String title = (String)map.get( "title" );
086
087 if ( title != null )
088 title = EntityDecoder.decode( title );
089
090 String rel = (String)map.get( "rel" );
091
092 if ( ! listener.onAnchor( resource, rel, title ) )
093 return;
094
095 }
096
097 }
098
099 public static void main( String[] args ) throws Exception {
100
101 AnchorParserListener listener = new AnchorParserListener() {
102
103 public boolean onAnchor( String href, String rel, String title ) {
104
105 System.out.println( "href: " + href );
106 System.out.println( "rel: " + rel );
107 System.out.println( "title: " + title );
108 return true;
109 }
110
111 public Object getResult() {
112 return null;
113 }
114 public void setContext( Object context ) {}
115
116 };
117
118 //FIXME: won't work with single quotes
119 //FIXME: won't work with <a />
120 //parse( "<a href=\"http://peerfear.org\" rel=\"linux\" title=\"linux\" >adf</a>", listener );
121
122 //parse( "<a rel=\"linux\" href=\"http://peerfear.org\" title=\"linux\" >adf</a>", listener );
123 //parse( "<a title=\"linux\" rel=\"linux\" href=\"http://peerfear.org\" >adf</a>", listener );
124
125 //parse( "<a href='http://peerfear.org' rel='linux' title='linux' >adf</a>", listener );
126
127 parse( "<a href='mailto:burton@rojo.com' rel='linux' title='linux' ><img src='' /></a>", listener );
128
129 }
130
131 }