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.controller.NonHandleableException;
070: import com.jcorporate.expresso.core.jsdkapi.GenericDispatcher;
071: import com.jcorporate.expresso.core.misc.StringUtil;
072: import org.apache.log4j.Logger;
073:
074: import javax.servlet.ServletException;
075: import javax.servlet.http.HttpServletRequest;
076: import javax.servlet.http.HttpServletResponse;
077: import java.io.IOException;
078: import java.util.Vector;
079:
080: /**
081: * Special servlet designed to interact with server-side Controller objects
082: *
083: * @author Michael Nash
084: */
085: public class JSPViewHandler extends ViewHandler {
086: private static Logger log = Logger.getLogger(JSPViewHandler.class);
087:
088: /**
089: * Process a Controller with an explicitly specified "view"
090: */
091: public void handleView(ControllerResponse con,
092: HttpServletRequest req, HttpServletResponse res)
093: throws ServletException, IOException, ControllerException,
094: NonHandleableException {
095: if (con.isCustomResponse()) {
096: return;
097: }
098:
099: String view = StringUtil.notNull(con.getParameter("view"));
100:
101: if (view.equals("")) {
102: view = StringUtil.notNull(con.getParameter("next"));
103: }
104: if (!view.equals("")) {
105:
106: /* check to see that there is something from the controller */
107: Vector inputs = con.getInputs();
108: Vector outputs = con.getOutputs();
109: Vector actions = con.getTransitions();
110: Vector blocks = con.getBlocks();
111:
112: if ((inputs == null) && (outputs == null)
113: && (actions == null) && (blocks == null)) {
114: throw new ServletException("No input, output or "
115: + "actions returned by this Controller");
116: }
117: }
118:
119: /* stash the response object in the session
120: REMOVED 10/2003 because everywhere else, response is added as attribute within request scope, not session scope. LAH */
121: // GenericSession.setAttribute(req, "controllerResponse", con);
122: /* if we didn't get redirected above, now we go somewhere... */
123: /* if there was a "next" parameter supplied... */
124: if (!view.equals("")) {
125: if (log.isDebugEnabled()) {
126: log.debug("Going to 'next/view' URL of '" + view
127: + "' (relative to web-app context root)");
128: }
129: try {
130: GenericDispatcher
131: .forward(req, res, res.encodeURL(view));
132: } catch (Exception ee) {
133: log.error("Error forwarding to '" + res.encodeURL(view)
134: + "'", ee);
135: throw new NonHandleableException(ee);
136: }
137: }
138: } /* doController(HttpServletRequest, HttpServletResponse, Hashtable) */
139:
140: }
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