de.berlios.jedi.presentation.editor.GetJispObjectAction.java Source code

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Here is the source code for de.berlios.jedi.presentation.editor.GetJispObjectAction.java

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/*
 * Copyright 2005-2006 Daniel Calvio Snchez
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY.
 *
 * See the COPYING file for more details.
 */

package de.berlios.jedi.presentation.editor;

import java.io.IOException;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

import de.berlios.jedi.common.entity.jisp.JispObject;
import de.berlios.jedi.presentation.ActionWithErrorSupport;
import de.berlios.jedi.presentation.JispIdManager;
import de.berlios.jedi.presentation.Keys;

/**
 * <p>
 * Sends the specified Jisp Object in response's output stream.<br>
 * Response content type is set to Jisp Object's mimetype.
 * </p>
 * <p>
 * If something went wrong, a forward to ADD_STATUS_FORWARD_NAME Key is made
 * and the NEXT_FORWARD_NAME Key is set to the error forward name.
 * </p>
 */
public class GetJispObjectAction extends ActionWithErrorSupport {

    /**
     * Handle server requests.
     * 
     * @param mapping
     *            The ActionMapping used to select this instance.
     * @param form
     *            The optional ActionForm bean for this request (if any).
     * @param request
     *            The HTTP request we are processing.
     * @param response
     *            The HTTP response we are creating.
     */
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
            HttpServletResponse response) {

        JispIdManager jispIdManager = (JispIdManager) request.getSession()
                .getAttribute(EditorKeys.JISP_ID_MANAGER_KEY);

        String jispObjectId = request.getParameter("jispObjectId");

        if (jispObjectId == null) {
            return errorForward(mapping, request, new ActionMessage("missedId", "jispObjectId"), "missedId",
                    Keys.ADD_STATUS_FORWARD_NAME);
        }

        JispObject jispObject = jispIdManager.getJispObject(jispObjectId);

        if (jispObject == null) {
            return errorForward(mapping, request, new ActionMessage("invalidId", "jispObjectId"), "invalidId",
                    Keys.ADD_STATUS_FORWARD_NAME);
        }

        response.setContentType(jispObject.getMimeType());

        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
            out.write(jispObject.getData());
        } catch (IOException e) {
            LogFactory.getLog(GetJispObjectAction.class)
                    .error("IOException when writing the JispObject to the" + " ServlerOutputStream", e);

            return errorForward(mapping, request, new ActionMessage("failedJispObjectWriteToOutputStream"),
                    "failedJispObjectWriteToOutputStream", Keys.ADD_STATUS_FORWARD_NAME);
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                }
            }
        }

        return null;
    }
}