Source Code Cross Referenced for Form.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:        import java.net.MalformedURLException;
037:        import java.net.URLEncoder;
038:
039:        /**
040:         * <FORM> element in an HTML page.
041:         */
042:        public class Form extends Link {
043:
044:            /**
045:             * Make a LinkElement from a start tag and end tag and a base URL (for relative references).  
046:             * The tags must be on the same page.
047:             * @param startTag Start tag of element
048:             * @param endTag End tag of element
049:             * @param base Base URL used for relative references
050:             */
051:            public Form(Tag startTag, Tag endTag, URL base)
052:                    throws MalformedURLException {
053:                super (startTag, endTag, base);
054:            }
055:
056:            /**
057:             * Construct the URL for this form, from its start tag and a base URL (for relative references).
058:             * @param tag Start tag of form.
059:             * @param base Base URL used for relative references
060:             * @return URL to which the button points
061:             */
062:            protected URL urlFromHref(Tag tag, URL base)
063:                    throws MalformedURLException {
064:                String href = tag.getHTMLAttribute("action");
065:                if (href == null)
066:                    // without an action attribute, the URL defaults to the base
067:                    return base;
068:                return new URL(base, href);
069:            }
070:
071:            /**
072:             * Get the method used to access this link.
073:             * @return GET or POST.
074:             */
075:            public int getMethod() {
076:                return getHTMLAttribute("method", "GET").equalsIgnoreCase(
077:                        "post") ? POST : GET;
078:            }
079:
080:            /**
081:             * Construct the query that would be submitted if the form's SUBMIT button were pressed.
082:             * @return a URL representing the submitted form, or null if the form cannot be represented as a URL.
083:             */
084:            public URL makeQuery() {
085:                return makeQuery(null);
086:            }
087:
088:            /**
089:             * Construct the query that would be submitted if the specified button were pressed.
090:             * @param button form button that triggers the submission.
091:             * @return a URL representing the submitted form, or null if the form cannot be represented as a URL.
092:             */
093:            public URL makeQuery(FormButton button) {
094:                StringBuffer querybuf = new StringBuffer();
095:                makeQuery(getChild(), querybuf);
096:
097:                if (button != null) {
098:                    String type = button.getHTMLAttribute("type", "");
099:                    String name = button.getHTMLAttribute("name", "");
100:                    String value = button.getHTMLAttribute("value", "");
101:
102:                    if (type.equalsIgnoreCase("submit")) {
103:                        passArgument(querybuf, name, value);
104:                    } else if (type.equalsIgnoreCase("image")) {
105:                        // simulate an imagemap click
106:                        passArgument(querybuf, name + ".x", "0");
107:                        passArgument(querybuf, name + ".y", "0");
108:                    }
109:                }
110:
111:                String href = getURL().toExternalForm() + "?";
112:                if (querybuf.length() > 0)
113:                    href += querybuf.toString().substring(1); // deletes '&' from front of querybuf
114:
115:                try {
116:                    return new URL(href);
117:                } catch (MalformedURLException e) {
118:                    throw new RuntimeException("internal error: " + e);
119:                }
120:            }
121:
122:            // appends "&name=val&name=val..." to query
123:            // for all form fields found among elements and their children
124:            private void makeQuery(Element elem, StringBuffer query) {
125:                for (Element e = elem; e != null; e = e.getSibling()) {
126:                    String tagName = e.getTagName();
127:                    if (tagName == Tag.INPUT) {
128:                        String type = e.getHTMLAttribute("type", "text")
129:                                .toLowerCase();
130:
131:                        if ( // always pass these fields
132:                        type.equals("text")
133:                                || type.equals("password")
134:                                || type.equals("hidden")
135:
136:                                // pass these fields if checked
137:                                || ((type.equals("checkbox") || type
138:                                        .equals("radio")) && e
139:                                        .hasHTMLAttribute("checked"))) {
140:                            passArgument(query, e.getHTMLAttribute("name", ""),
141:                                    e.getHTMLAttribute("value", ""));
142:                        }
143:                    } else if (tagName == Tag.SELECT) {
144:                        String name = e.getHTMLAttribute("name", "");
145:                        for (Element opt = e.getChild(); opt != null; opt = opt
146:                                .getSibling()) {
147:                            if (opt.getTagName() == Tag.OPTION
148:                                    && opt.hasHTMLAttribute("selected")) {
149:                                passArgument(query, name, opt.getHTMLAttribute(
150:                                        "value", ""));
151:                            }
152:                        }
153:                    } else if (tagName == Tag.TEXTAREA) {
154:                        passArgument(query, e.getHTMLAttribute("name", ""), e
155:                                .toText());
156:                    } else {
157:                        makeQuery(e.getChild(), query);
158:                    }
159:                }
160:            }
161:
162:            private void passArgument(StringBuffer query, String name,
163:                    String value) {
164:                query.append('&');
165:                query.append(URLEncoder.encode(name)); // FIX: should name be encoded?
166:                query.append('=');
167:                query.append(URLEncoder.encode(value));
168:            }
169:        }
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