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

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Java Source Code / Java Documentation » Web Crawler » WebSPHINX » websphinx 
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;
034:
035:        import java.net.URL;
036:
037:        /**
038:         * Standard classifier, installed in every crawler by default.
039:         * <P>On the entire page, this classifier sets the following labels:
040:         * <UL>
041:         * <LI><B>root</B>: page is the root page of a Web site.  For instance,
042:         *     "http://www.digital.com/" and "http://www.digital.com/index.html" are both
043:         *     marked as root, but "http://www.digital.com/about" is not.
044:         * </UL>
045:         * <P>Also sets one or more of the following labels on every link:
046:         * <UL>
047:         * <LI><B>hyperlink</B>: link is a hyperlink (A, AREA, or FRAME tags) to another page on the Web (using http, file, ftp, or gopher protocols)
048:         * <LI><B>image</B>: link is an inline image (IMG).
049:         * <LI><B>form</B>: link is a form (FORM tag).  A form generally requires some parameters to use.
050:         * <LI><B>code</B>: link points to code (APPLET, EMBED, or SCRIPT).
051:         * <LI><B>remote</B>: link points to a different Web server.
052:         * <LI><B>local</B>: link points to the same Web server.
053:         * <LI><B>same-page</B>: link points to the same page (e.g., by an anchor reference like "#top")
054:         * <LI><B>sibling</B>: a local link that points to a page in the same directory (e.g. "sibling.html")
055:         * <LI><B>descendent</B>: a local link that points downwards in the directory structure (e.g., "deep/deeper/deepest.html")
056:         * <LI><B>ancestor</B>: a link that points upwards in the directory structure (e.g., "../..")
057:         * </UL>
058:         */
059:        public class StandardClassifier implements  Classifier {
060:
061:            /**
062:             * Make a StandardClassifier.
063:             */
064:            public StandardClassifier() {
065:            }
066:
067:            /** 
068:             * Classify a page.
069:             * @param page Page to classify
070:             */
071:            // FIX: use regular expressions throughout this method
072:            public void classify(Page page) {
073:                Link origin = page.getOrigin();
074:                String pageHost = origin.getHost();
075:                int pagePort = origin.getPort();
076:                String pagePath = origin.getFile();
077:                String pageFilename = origin.getFilename();
078:
079:                URL base = page.getBase();
080:                String baseHost = base.getHost();
081:                int basePort = base.getPort();
082:                String basePath = base.getFile();
083:
084:                if (pageFilename.equals("")
085:                        || pageFilename.startsWith("index.htm"))
086:                    page.setLabel("root");
087:
088:                // FIX: Link needs to resolve "foo/bar/.." and "foo/." to "foo" in order for this
089:                // stuff to work properly
090:                Link[] links = page.getLinks();
091:                if (links != null) {
092:                    for (int i = 0; i < links.length; ++i) {
093:                        Link link = links[i];
094:
095:                        if ((link.getHost().equals(pageHost) && link.getPort() == pagePort)
096:                                || (link.getHost().equals(baseHost) && link
097:                                        .getPort() == basePort)) {
098:                            link.setLabel("local");
099:
100:                            String linkPath = link.getFile();
101:
102:                            if (linkPath.equals(pagePath)
103:                                    || linkPath.equals(basePath))
104:                                link.setLabel("same-page");
105:                            else if (link.getDirectory().equals(
106:                                    origin.getDirectory()))
107:                                link.setLabel("sibling");
108:                            else if (descendsFrom(linkPath, pagePath)
109:                                    || descendsFrom(linkPath, basePath))
110:                                link.setLabel("descendent");
111:                            else if (descendsFrom(pagePath, linkPath)
112:                                    || descendsFrom(basePath, linkPath))
113:                                link.setLabel("ancestor");
114:                            // NIY: child, parent
115:                        } else
116:                            link.setLabel("remote");
117:
118:                        // Link tag kinds: resource, form, hyperlink
119:                        String tagName = link.getTagName();
120:
121:                        if (tagName == Tag.IMG)
122:                            link.setLabel("image");
123:                        else if (tagName == Tag.APPLET || tagName == Tag.EMBED
124:                                || tagName == Tag.SCRIPT)
125:                            link.setLabel("code");
126:                        else if (tagName == Tag.FORM)
127:                            link.setLabel("form");
128:                        else if (tagName == Tag.A || tagName == Tag.AREA
129:                                || tagName == Tag.FRAME) {
130:                            String protocol = link.getProtocol();
131:
132:                            if ((protocol.equals("http")
133:                                    || protocol.equals("ftp")
134:                                    || protocol.equals("file") || protocol
135:                                    .equals("gopher"))
136:                                    && link.getMethod() == Link.GET)
137:                                link.setLabel("hyperlink");
138:                        }
139:                    }
140:                }
141:            }
142:
143:            private boolean descendsFrom(String path1, String path2) {
144:                return path1.startsWith(path2.endsWith("/") ? path2 : path2
145:                        + "/");
146:            }
147:
148:            /**
149:             * Priority of this classifier.
150:             */
151:            public static final float priority = 0.0F;
152:
153:            /**
154:             * Get priority of this classifier.
155:             * @return priority.
156:             */
157:            public float getPriority() {
158:                return priority;
159:            }
160:        }
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