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

Show more of this group Show more artifacts with this name
Show all versions of tomahawk21 Show documentation

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.

The newest version!

/*
 * 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 javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.webapp.UIComponentTag;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;

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


/**
 * Tag to add a tab change listeners to a {@link org.apache.myfaces.custom.tabbedpane.HtmlPanelTabbedPane}
 *
 * @JSFJspTag
 *   name="t:tabChangeListener"
 *   bodyContent="empty"
 *   tagHandler = "org.apache.myfaces.custom.tabbedpane.TabChangeListenerTagHandler"
 *   
 * @author Oliver Rossmueller
 * @version $Revision: 692184 $ $Date: 2008-09-04 13:21:52 -0500 (Thu, 04 Sep 2008) $
 */
public class TabChangeListenerTag extends TagSupport
{
    private static final long serialVersionUID = -6903749011638483023L;
    private String type = null;


    public TabChangeListenerTag()
    {
    }

    /**
     * @JSFJspAttribute
     *   required = "true"
     */
    public void setType(String type)
    {
        this.type = type;
    }


    public int doStartTag() throws JspException
    {
        if (type == null)
        {
            throw new JspException("type attribute not set");
        }

        //Find parent UIComponentTag
        UIComponentTag componentTag = UIComponentTag.getParentUIComponentTag(pageContext);
        if (componentTag == null)
        {
            throw new JspException("TabChangeListenerTag has no UIComponentTag ancestor");
        }

        if (componentTag.getCreated())
        {
            //Component was just created, so we add the Listener
            UIComponent component = componentTag.getComponentInstance();
            if (component instanceof HtmlPanelTabbedPane)
            {
                Object listenerRef = type;
                if (UIComponentTag.isValueReference(type))
                {
                    FacesContext facesContext = FacesContext.getCurrentInstance();
                    ValueBinding valueBinding = facesContext.getApplication().createValueBinding(type);
                    listenerRef = valueBinding.getValue(facesContext);
                }

                if(listenerRef instanceof String)
                {
                    String className = (String) listenerRef;
                    TabChangeListener listener = (TabChangeListener) ClassUtils.newInstance(className);
                    ((HtmlPanelTabbedPane) component).addTabChangeListener(listener);
                }
                else if(listenerRef instanceof TabChangeListener)
                {
                    TabChangeListener listener = (TabChangeListener) listenerRef;
                    ((HtmlPanelTabbedPane) component).addTabChangeListener(listener);

                }
                else
                    throw new JspException("type is neither a 'String' nor a value-binding to a 'String' or a 'TabChangeListener' instance.");
            }
            else
            {
                throw new JspException("Component " + component.getId() + " is no HtmlPanelTabbedPane");
            }
        }

        return Tag.SKIP_BODY;
    }
}