/*
 * $Id: PortletActionContext.java 495502 2007-01-12 07:15:43Z mrdon $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.struts2.portlet.context;

import java.util.Map;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.PortletConfig;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import org.apache.struts2.dispatcher.mapper.ActionMapping;
import org.apache.struts2.portlet.PortletActionConstants;

import com.opensymphony.xwork2.ActionContext;


/**
 * PortletActionContext. ActionContext thread local for the portlet environment.
 *
 * @version $Revision: 495502 $ $Date: 2007-01-12 02:15:43 -0500 (Fri, 12 Jan 2007) $
 */
public class PortletActionContext implements PortletActionConstants {

    /**
     * Get the PortletConfig of the portlet that is executing.
     *
     * @return The PortletConfig of the executing portlet.
     */
    public static PortletConfig getPortletConfig() {
        return (PortletConfig) getContext().get(PORTLET_CONFIG);
    }

    /**
     * Get the RenderRequest. Can only be invoked in the render phase.
     *
     * @return The current RenderRequest.
     * @throws IllegalStateException If the method is invoked in the wrong phase.
     */
    public static RenderRequest getRenderRequest() {
        if (!isRender()) {
            throw new IllegalStateException(
                    "RenderRequest cannot be obtained in event phase");
        }
        return (RenderRequest) getContext().get(REQUEST);
    }

    /**
     * Get the RenderResponse. Can only be invoked in the render phase.
     *
     * @return The current RenderResponse.
     * @throws IllegalStateException If the method is invoked in the wrong phase.
     */
    public static RenderResponse getRenderResponse() {
        if (!isRender()) {
            throw new IllegalStateException(
                    "RenderResponse cannot be obtained in event phase");
        }
        return (RenderResponse) getContext().get(RESPONSE);
    }

    /**
     * Get the ActionRequest. Can only be invoked in the event phase.
     *
     * @return The current ActionRequest.
     * @throws IllegalStateException If the method is invoked in the wrong phase.
     */
    public static ActionRequest getActionRequest() {
        if (!isEvent()) {
            throw new IllegalStateException(
                    "ActionRequest cannot be obtained in render phase");
        }
        return (ActionRequest) getContext().get(REQUEST);
    }

    /**
     * Get the ActionRequest. Can only be invoked in the event phase.
     *
     * @return The current ActionRequest.
     * @throws IllegalStateException If the method is invoked in the wrong phase.
     */
    public static ActionResponse getActionResponse() {
        if (!isEvent()) {
            throw new IllegalStateException(
                    "ActionResponse cannot be obtained in render phase");
        }
        return (ActionResponse) getContext().get(RESPONSE);
    }

    /**
     * Get the action namespace of the portlet. Used to organize actions for multiple portlets in
     * the same portlet application.
     *
     * @return The portlet namespace as defined in <code>portlet.xml</code> and <code>struts.xml</code>
     */
    public static String getPortletNamespace() {
        return (String)getContext().get(PORTLET_NAMESPACE);
    }

    /**
     * Get the current PortletRequest.
     *
     * @return The current PortletRequest.
     */
    public static PortletRequest getRequest() {
        return (PortletRequest) getContext().get(REQUEST);
    }

    /**
     * Get the current PortletResponse
     *
     * @return The current PortletResponse.
     */
    public static PortletResponse getResponse() {
        return (PortletResponse) getContext().get(RESPONSE);
    }

    /**
     * Get the phase that the portlet is executing in.
     *
     * @return {@link PortletActionConstants#RENDER_PHASE} in render phase, and
     * {@link PortletActionConstants#EVENT_PHASE} in the event phase.
     */
    public static Integer getPhase() {
        return (Integer) getContext().get(PHASE);
    }

    /**
     * @return <code>true</code> if the Portlet is executing in render phase.
     */
    public static boolean isRender() {
        return PortletActionConstants.RENDER_PHASE.equals(getPhase());
    }

    /**
     * @return <code>true</code> if the Portlet is executing in the event phase.
     */
    public static boolean isEvent() {
        return PortletActionConstants.EVENT_PHASE.equals(getPhase());
    }

    /**
     * @return The current ActionContext.
     */
    private static ActionContext getContext() {
        return ActionContext.getContext();
    }

    /**
     * Check to see if the current request is a portlet request.
     *
     * @return <code>true</code> if the current request is a portlet request.
     */
    public static boolean isPortletRequest() {
        return getRequest() != null;
    }

    /**
     * Get the default action mapping for the current mode.
     *
     * @return The default action mapping for the current portlet mode.
     */
    public static ActionMapping getDefaultActionForMode() {
        return (ActionMapping)getContext().get(DEFAULT_ACTION_FOR_MODE);
    }

    /**
     * Get the namespace to mode mappings.
     *
     * @return The map of the namespaces for each mode.
     */
    public static Map getModeNamespaceMap() {
        return (Map)getContext().get(MODE_NAMESPACE_MAP);
    }

}