Source Code Cross Referenced for Google.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.google.com/">Google</a> search engine.
042:         * @author Justin Boitano
043:         */
044:        public class Google implements  SearchEngine {
045:
046:            static Pattern patCount = new Regexp(
047:                    "</b> of approximately <b>\\d+,?(\\d+)</b> for <b>");
048:            static Pattern patNoHits = new Regexp(
049:                    "Your search did not produce any results");
050:
051:            static Pattern patResult = new Tagexp(
052:                    "<p>(?{link}<a>(?{title})</a>)<font>" // title and main link
053:                            + "<BR>(?{description}.*?)<font color=green>" //description of link 
054:            );
055:
056:            static Pattern patMoreLink = new Tagexp(
057:                    "<A HREF=/search?q=*><img><br><font>.*?</a>");
058:
059:            /**
060:             * Classify a page.  Sets the following labels:
061:             * <TABLE>
062:             * <TR><TH>Name <TH>Type  <TH>Meaning
063:             * <TR><TD>searchengine.source <TD>Page label <TD>Google object that labeled the page
064:             * <TR><TD>searchengine.count <TD>Page field <TD>Number of results on page
065:             * <TR><TD>searchengine.results <TD>Page fields <TD>Array of results.  Each result region
066:             * contains subfields: rank, title, description, and link.
067:             * <TR><TD>searchengine.more-results <TD>Link label <TD>Link to a page containing more results.
068:             * </TABLE>
069:             */
070:            public void classify(Page page) {
071:                String title = page.getTitle();
072:                if (title != null && title.startsWith("Google Search:")) {
073:                    page.setObjectLabel("searchengine.source", this );
074:
075:                    Region count = patCount.oneMatch(page);
076:
077:                    if (count != null)
078:                        page
079:                                .setField("searchengine.count", count
080:                                        .getField("0"));
081:
082:                    Region[] results = patResult.allMatches(page);
083:                    SearchEngineResult[] ser = new SearchEngineResult[results.length];
084:
085:                    for (int i = 0; i < results.length; ++i)
086:                        ser[i] = new SearchEngineResult(results[i]);
087:                    page.setFields("searchengine.results", ser);
088:
089:                    PatternMatcher m = patMoreLink.match(page);
090:
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 Google.
114:             * @param keywords list of keywords, separated by spaces
115:             * @return URL that submits the keywords to Google.
116:             */
117:            public URL makeQuery(String keywords) {
118:                try {
119:                    return new URL("http://www.google.com/search?q="
120:                            + URLEncoder.encode(keywords));
121:                } catch (MalformedURLException e) {
122:                    throw new RuntimeException("internal error");
123:                }
124:            }
125:
126:            /**
127:             * Get number of results per page for this search engine.
128:             * @return typical number of results per page
129:             */
130:            public int getResultsPerPage() {
131:                return 10;
132:            }
133:
134:            /**
135:             * Search Google.
136:             * @param keywords list of keywords, separated by spaces
137:             * @return enumeration of SearchEngineResults returned by an Google query constructed from the keywords.
138:             */
139:            public static Search search(String keywords) {
140:                return new Search(new Google(), keywords);
141:            }
142:
143:            /**
144:             * Search Google.
145:             * @param keywords list of keywords, separated by spaces
146:             * @param maxResults maximum number of results to return
147:             * @return enumeration of SearchEngineResults returned by an Google query constructed from the keywords.
148:             * The enumeration yields at most maxResults objects.
149:             */
150:            public static Search search(String keywords, int maxResults) {
151:                return new Search(new Google(), keywords, maxResults);
152:            }
153:        }
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