001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.core.servlet.viewhandler;
066:
067: import com.jcorporate.expresso.core.controller.ControllerException;
068: import com.jcorporate.expresso.core.controller.ControllerResponse;
069: import com.jcorporate.expresso.core.db.DBException;
070: import com.jcorporate.expresso.core.misc.StringUtil;
071: import com.jcorporate.expresso.ext.xml.dbobj.ControllerXSLMap;
072: import com.jcorporate.expresso.ext.xml.dbobj.UserAgent;
073: import com.jcorporate.expresso.services.dbobj.Setup;
074: import org.apache.log4j.Logger;
075:
076: import javax.servlet.ServletConfig;
077: import javax.servlet.ServletException;
078: import javax.servlet.http.HttpServletRequest;
079: import javax.servlet.http.HttpServletResponse;
080: import javax.xml.transform.Transformer;
081: import javax.xml.transform.TransformerConfigurationException;
082: import javax.xml.transform.TransformerException;
083: import javax.xml.transform.TransformerFactory;
084: import javax.xml.transform.stream.StreamResult;
085: import javax.xml.transform.stream.StreamSource;
086: import java.io.File;
087: import java.io.IOException;
088: import java.io.PrintWriter;
089: import java.io.StringReader;
090:
091: /**
092: * Special servlet designed to interact with server-side Controller objects,
093: * transforming xml
094: *
095: * @author Michael Nash, Larry Hamel
096: */
097: public class XMLViewHandler extends ViewHandler {
098: protected static final String this Class = XMLViewHandler.class
099: .getName()
100: + ".";
101: private static Logger log = Logger.getLogger(XMLViewHandler.class);
102: private String mRootPath;
103:
104: public XMLViewHandler() {
105: }
106:
107: /**
108: * Handle the Controller by producing XML output, transforming via a specified
109: * XSL stylesheet
110: * Creation date: (8/3/00 5:22:58 PM)
111: */
112: public void handleView(ControllerResponse con,
113: HttpServletRequest req, HttpServletResponse res)
114: throws ControllerException, IOException, ServletException {
115:
116: try {
117: String xsltName = StringUtil.notNull(con
118: .getParameter("xsl"));
119:
120: /* If the xslt name is not defined, use the default name */
121: if (xsltName.equals("")) {
122: xsltName = Setup.getValueRequired(con.getDBName(),
123: "DefaultXSL");
124:
125: String userAgent = StringUtil.notNull(req
126: .getHeader("User-agent"));
127: UserAgent ua = new UserAgent();
128: ua.setDataContext(con.getDBName());
129:
130: /* wlo: changed 'String' to 'int'
131: the changes here are due to the parameter type change
132: of the getMatch() method in the ControllerXSLMap class */
133: int uaId = 0;
134:
135: if (ua.getMatch(userAgent)) {
136: uaId = ua.getFieldInt("UserAgent"); //wlo: changed 'getField' to 'getFieldInt'
137:
138: ControllerXSLMap myMap = new ControllerXSLMap();
139: myMap.setDataContext(con.getDBName());
140:
141: if (myMap.getMatch(con.getUser(), con
142: .getControllerClass(), uaId)) {
143: xsltName = myMap.getField("XSLFileName");
144: } /* if mapping found for this controller */
145:
146: } /* if user-agent match for this user-agent string */
147:
148: }
149:
150: // set content type
151: String mime = con.getParameter("mime");
152: if (mime != null) {
153: res.setContentType(mime);
154: } else if (xsltName.equalsIgnoreCase("none")) {
155: res.setContentType("text/xml");
156: } else {
157: // assume html
158:
159: String charset = con.getString("charset");
160:
161: if (charset != null) {
162: res.setContentType("text/html;charset=" + charset);
163: } else {
164: res.setContentType("text/html;charset=ISO-8859-1");
165: }
166: }
167:
168: PrintWriter out = res.getWriter();
169: String responseString = con.toXML();
170:
171: if (xsltName.equalsIgnoreCase("none")) {
172: // raw xml from controllers
173: out.println("<?xml version=\"1.0\"?>");
174: out.println(responseString);
175: } else {
176:
177: // determine whether the xsl path is relative
178: File xslFile = new File(xsltName);
179: if (!xslFile.exists()) {
180: xslFile = new File(mRootPath, xsltName);
181: if (!xslFile.exists()) {
182: log.error("cannot find xsl file: " + xsltName);
183: }
184: }
185:
186: // Have the XSLTProcessorFactory obtain a interface to a
187: // new XSLTProcessor object.
188: TransformerFactory tFactory = TransformerFactory
189: .newInstance();
190: Transformer transformer = tFactory
191: .newTransformer(new StreamSource(xslFile));
192:
193: // Have the transformer object transform the output of the controller
194: transformer.transform(new StreamSource(
195: new StringReader(responseString)),
196: new StreamResult(out));
197: }
198:
199: //out.flush();
200: } catch (DBException de) {
201: res.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
202: throw new ControllerException(de);
203: } catch (TransformerConfigurationException te1) {
204: res.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
205: throw new ControllerException(te1);
206: } catch (TransformerException te2) {
207: res.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
208: throw new ControllerException(te2);
209: }
210: } /* handleView() */
211:
212: /**
213: * Standard Servlet init() function
214: *
215: * @param sc The servlet Configuration passed by the web.xml file
216: */
217: public void init(ServletConfig sc) throws ServletException {
218: super .init(sc);
219: mRootPath = sc.getServletContext().getRealPath("/");
220: } /* init(ServletConfig) */
221:
222: }
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