/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/

package net.wotonomy.web;

import net.wotonomy.foundation.NSArray;

/**
 * An implementation of WORequestHandler that dispatches DirectActions. <br>
 * <br>
 *
 * See WODirectAction for the rules for parsing a request. In short, className
 * defaults to "DirectAction", and the action defaults to "default". The action
 * class is expected to have a constructor that takes a WORequest parameter.
 *
 * @author michael@mpowers.net
 * @author $Author: cgruber $
 * @version $Revision: 905 $
 */
public class WODirectActionRequestHandler extends WORequestHandler {
	public WOResponse handleRequest(WORequest aRequest) {
		WOResponse response = null;

		// no concurrent access is allowed to a user's session:
		// a user/browser/machine with multiple requests will have to wait.
		// NOTE: this forces a session creation for any direct action (!)
		synchronized (aRequest.request.getSession()) {
			WOApplication application = aRequest.application();
			WOContext context = WOContext.contextWithRequest(aRequest);

			String className = "DirectAction";
			String actionName = "default";
			NSArray path = aRequest.requestHandlerPathArray();
			if (path.count() > 0) {
				className = path.objectAtIndex(0).toString();
				if (path.count() > 1) {
					actionName = path.objectAtIndex(path.count() - 1).toString();
				}
				if (path.count() > 2) {
					for (int i = 1; i < path.count() - 1; i++) {
						className = className + "." + path.objectAtIndex(i).toString();
					}
				}
			}

			// FIXME: sessions are supposed to be lazily created for direct actions

			WOSession session = null;

			String sessionID = aRequest.sessionID();
			if (sessionID != null) {
				session = application.restoreSessionWithID(sessionID, context);
			}

			if (session == null) {
				session = application.createSessionForRequest(aRequest);
				if (session == null) {
					response = application.handleSessionCreationErrorInContext(context);
				} else {
					session.setContext(context);
				}
			}

			context.setSession(session);

			application.awake();
			session.awake();

			try {

				if (response == null) {
					Class c = null;
					c = application.getLocalClass(className);
					if ((c == null) && (path.count() == 1)) {
						actionName = className;
						className = "DirectAction";
						c = application.getLocalClass(className);
					}
					if (c == null) {
						throw new RuntimeException("Could not find class named \"" + className + "\": ");
					}
					java.lang.reflect.Constructor ctor = c.getConstructor(new Class[] { WORequest.class });

					WODirectAction action = (WODirectAction) ctor.newInstance(new Object[] { aRequest });
					action.context = context; // HACK: how else can action call pageWithName?

					WOActionResults result = action.performActionNamed(actionName);
					if (result instanceof WOComponent) {
						// HACK: I'm not sure where this should have gone: seems hackish here.
						context.pushElement((WOComponent) result);
						((WOComponent) result).ensureAwakeInContext(context);
						// context.popElement();
					}
					response = result.generateResponse(); // calls session.savePage (?)
					if (result instanceof WOComponent) {
						// HACK: I'm not sure where this should have gone: seems hackish here.
						((WOComponent) result).sleep();
					}
				}
			} catch (NoSuchMethodException exc) {
				WOResponse error = new WOResponse();
				exc.printStackTrace();
				error.setStatus(404); // not found
				error.appendContentString("Could not find request constructor for class named \"" + className + "\": ");
				response = error;
			} catch (Exception exc) {
				WOResponse error = new WOResponse();
				error.setStatus(500); // error
				if (exc.getMessage() != null) {
					error.appendContentString(exc.getMessage());
					exc.printStackTrace();
				} else {
					error.appendContentString(exc.toString());
					exc.printStackTrace();
				}
				response = error;
			}

			session.sleep();
			session.setContext(null);
			application.saveSessionForContext(context);
			application.sleep();
		}
		return response;
	}

}

/*
 * $Log$ Revision 1.2 2006/02/19 01:44:02 cgruber Add xmlrpc files Remove jclark
 * and replace with dom4j and javax.xml.sax stuff Re-work dependencies and
 * imports so it all compiles.
 *
 * Revision 1.1 2006/02/16 13:22:22 cgruber Check in all sources in
 * eclipse-friendly maven-enabled packages.
 *
 * Revision 1.10 2003/03/28 17:26:18 mpowers Implemented package support:
 * Applications can now live in packages. Better support for locating package
 * local classes.
 *
 * Revision 1.9 2003/01/19 22:33:26 mpowers Fixed problems with classpath and
 * dynamic class loading. Dynamic elements now pass on ensureAwakeInContext.
 * Parser how handles <standalone/> tags.
 *
 * Revision 1.8 2003/01/17 20:34:57 mpowers Better handling for components and
 * parents in the context's element stack.
 *
 * Revision 1.7 2003/01/15 19:50:49 mpowers Fixed issues with WOSession and
 * Serializable. Can now persist sessions between classloaders (hot swap of
 * class impls).
 *
 * Revision 1.5 2003/01/13 22:25:00 mpowers Request-response cycle is working
 * with session and page persistence.
 *
 * Revision 1.4 2003/01/09 21:16:49 mpowers Bringing request-response cycle more
 * into conformance.
 *
 * Revision 1.2 2002/12/17 14:57:44 mpowers Minor corrections to WORequests's
 * parsing, and updated javadocs.
 *
 * Revision 1.1.1.1 2000/12/21 15:53:19 mpowers Contributing wotonomy.
 *
 * Revision 1.2 2000/12/20 16:25:50 michael Added log to all files.
 *
 *
 */