org.apache.myfaces.custom.tabbedpane.TabChangeListenerTagHandler Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * 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.myfaces.custom.tabbedpane;

import java.io.IOException;

import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;

import org.apache.myfaces.shared_tomahawk.util.ClassUtils;

/**
 * Custom Facelets taghandler for the TabChangeListener class.
 *  
 * @since 1.1.7
 */
public class TabChangeListenerTagHandler extends TagHandler
{
    private final TagAttribute typeAttr;

    public TabChangeListenerTagHandler(TagConfig config)
    {
        super(config);
        typeAttr = getRequiredAttribute("type");
    }

    public void apply(FaceletContext faceletContext, UIComponent parent)
            throws IOException, FacesException, FaceletException, ELException
    {
        // only process this tag if the parent has just been created..
        if (parent.getParent() == null)
        {
            if (parent instanceof HtmlPanelTabbedPane)
            {
                Object listenerRef;
                if (typeAttr.isLiteral())
                {
                    listenerRef = typeAttr.getValue();
                }
                else
                {
                    listenerRef = typeAttr.getObject(faceletContext);
                }
                
                if (listenerRef instanceof String)
                {
                    String className = (String) listenerRef;
                    TabChangeListener listener = (TabChangeListener) ClassUtils.newInstance(className);
                    ((HtmlPanelTabbedPane) parent).addTabChangeListener(listener);
                }
                else if (listenerRef instanceof TabChangeListener)
                {
                    TabChangeListener listener = (TabChangeListener) listenerRef;
                    ((HtmlPanelTabbedPane) parent).addTabChangeListener(listener);
                }
                else if (listenerRef == null)
                {
                    throw new FaceletException("Property 'type' must not be null.");
                }
                else
                {
                    throw new FaceletException(
                       "Property 'type' must be either a string (containing a class name) " +
                       "or a TabChangeListener instance.");
                }
            }
            else
            {
                throw new FaceletException(
                        "Component " + parent.getId() + " is not of type HtmlPanelTabbedPane");
            }
        }
    }
}