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/*
 * $Id$
 *
 * 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.struts.faces.renderer;


import java.util.ArrayList;
import java.util.Iterator;

import javax.faces.component.UIComponent;
import javax.faces.component.UIParameter;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;

import org.apache.struts.Globals;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.ResponseUtils;


/**
 * Renderer implementation for the message tag
 * from the Struts-Faces Integration Library.
 *
 * @version $Rev$ $Date$
 */

public class MessageRenderer extends WriteRenderer {


    // -------------------------------------------------------- Static Variables


    // ---------------------------------------------------------- Public Methods


    // ------------------------------------------------------- Protected Methods


    /**
     * Return the message format String to be processed for this message.
     * 
     *
     * @param context FacesContext for the response we are creating
     * @param component Component to be rendered
     *
     * @exception IllegalArgumentException if no MessageResources bundle
     *  can be found
     * @exception IllegalArgumentException if no message key can be found
     */
    protected String getText(FacesContext context, UIComponent component) {

        // Look up the MessageResources bundle to be used
        String bundle = (String) component.getAttributes().get("bundle");
        if (bundle == null) {
            bundle = Globals.MESSAGES_KEY;
        }
        MessageResources resources = (MessageResources)
            context.getExternalContext().getApplicationMap().get(bundle);
        if (resources == null) { // FIXME - i18n
            throw new IllegalArgumentException("MessageResources bundle " +
                                               bundle + " not found");
        }

        // Look up the message key to be used
        Object value = component.getAttributes().get("key");
        if (value == null) {
            value = ((ValueHolder) component).getValue();
        }
        if (value == null) { // FIXME - i18n
            throw new NullPointerException("Component '" +
                                           component.getClientId(context) +
                                           "' has no current value");
        }
        String key = value.toString();

        // Build the substitution arguments list
        ArrayList