Source Code Cross Referenced for MetaCrawler.java in  » Web-Crawler » WebSPHINX » websphinx » searchengine » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » WebSPHINX » websphinx.searchengine 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * WebSphinx web-crawling toolkit
003:         *
004:         * Copyright (c) 1998-2002 Carnegie Mellon University.  All rights
005:         * reserved.
006:         *
007:         * Redistribution and use in source and binary forms, with or without
008:         * modification, are permitted provided that the following conditions
009:         * are met:
010:         *
011:         * 1. Redistributions of source code must retain the above copyright
012:         *    notice, this list of conditions and the following disclaimer.
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
020:         * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
021:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
022:         * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
023:         * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
024:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
025:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
026:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
027:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
028:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
029:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
030:         *
031:         */
032:
033:        package websphinx.searchengine;
034:
035:        import websphinx.*;
036:        import java.net.URL;
037:        import java.net.URLEncoder;
038:        import java.net.MalformedURLException;
039:
040:        /**
041:         * <A href="http://www.metacrawler.com/">MetaCrawler</a> search engine.
042:         */
043:        public class MetaCrawler implements  SearchEngine {
044:
045:            static Pattern patCount = new Regexp(
046:                    "Collated Results: 1 to \\d+ of (\\d+) references");
047:            static Pattern patNoHits = new Regexp(
048:                    "Your search did not produce any results");
049:
050:            static Pattern patResult = new Tagexp(
051:                    "<dt><font color=#000000><b>(?{relevance})</b></font>" // relevance rating
052:                            + "(?{link}(?{title}<a>.*?</a>))" // title and main link
053:                            + "(?{description}<dt>.*?<font>)" // description
054:            );
055:
056:            //static Pattern patMoreLink = new Regexp (
057:            //    "<a href=\"http://\\w+.metacrawler.com/crawler\\?general.*?\">\\d+</a>"
058:            //);
059:            static Pattern patMoreLink = new Tagexp(
060:                    "<a href=http://*.metacrawler.com/crawler\\?general*></a>");
061:
062:            /**
063:             * Classify a page.  Sets the following labels:
064:             * <TABLE>
065:             * <TR><TH>Name <TH>Type  <TH>Meaning
066:             * <TR><TD>searchengine.source <TD>Page label <TD>MetaCrawler object that labeled the page
067:             * <TR><TD>searchengine.count <TD>Page field <TD>Number of results on page
068:             * <TR><TD>searchengine.results <TD>Page fields <TD>Array of results.  Each result region
069:             * contains subfields: rank, title, description, and link.
070:             * <TR><TD>searchengine.more-results <TD>Link label <TD>Link to a page containing more results.
071:             * </TABLE>
072:             */
073:            public void classify(Page page) {
074:                String title = page.getTitle();
075:                if (title != null && title.startsWith("Metacrawler query:")) {
076:                    page.setObjectLabel("searchengine.source", this );
077:
078:                    Region count = patCount.oneMatch(page);
079:                    if (count != null)
080:                        page
081:                                .setField("searchengine.count", count
082:                                        .getField("0"));
083:
084:                    Region[] results = patResult.allMatches(page);
085:                    SearchEngineResult[] ser = new SearchEngineResult[results.length];
086:                    for (int i = 0; i < results.length; ++i)
087:                        ser[i] = new SearchEngineResult(results[i]);
088:                    page.setFields("searchengine.results", ser);
089:
090:                    PatternMatcher m = patMoreLink.match(page);
091:                    while (m.hasMoreElements()) {
092:                        Link link = (Link) m.nextMatch();
093:                        link.setLabel("searchengine.more-results");
094:                        link.setLabel("hyperlink");
095:                    }
096:                }
097:            }
098:
099:            /**
100:             * Priority of this classifier.
101:             */
102:            public static final float priority = 0.0F;
103:
104:            /**
105:             * Get priority of this classifier.
106:             * @return priority.
107:             */
108:            public float getPriority() {
109:                return priority;
110:            }
111:
112:            /**
113:             * Make a query URL for MetaCrawler.
114:             * @param keywords list of keywords, separated by spaces
115:             * @return URL that submits the keywords to MetaCrawler.
116:             */
117:            public URL makeQuery(String keywords) {
118:                try {
119:                    return new URL(
120:                            "http://www.metacrawler.com/crawler?general="
121:                                    + URLEncoder.encode(keywords)
122:                                    + "&method=1&format=1&region=&rpp=20&timeout=15&hpe=10");
123:                } catch (MalformedURLException e) {
124:                    throw new RuntimeException("internal error");
125:                }
126:            }
127:
128:            /**
129:             * Get number of results per page for this search engine.
130:             * @return typical number of results per page
131:             */
132:            public int getResultsPerPage() {
133:                return 20;
134:            }
135:
136:            /**
137:             * Search MetaCrawler.
138:             * @param keywords list of keywords, separated by spaces
139:             * @return enumeration of SearchEngineResults returned by an MetaCrawler query constructed from the keywords.
140:             */
141:            public static Search search(String keywords) {
142:                return new Search(new MetaCrawler(), keywords);
143:            }
144:
145:            /**
146:             * Search MetaCrawler.
147:             * @param keywords list of keywords, separated by spaces
148:             * @param maxResults maximum number of results to return
149:             * @return enumeration of SearchEngineResults returned by an MetaCrawler query constructed from the keywords.
150:             * The enumeration yields at most maxResults objects.
151:             */
152:            public static Search search(String keywords, int maxResults) {
153:                return new Search(new MetaCrawler(), keywords, maxResults);
154:            }
155:        }
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