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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 JSF1.2 features. A JSF1.2 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.collapsiblepanel;

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

import org.apache.myfaces.component.UserRoleAware;
import org.apache.myfaces.component.html.ext.HtmlCommandLink;

/**
 * Link used to collapse or expand a t:collapsiblePanel. 
 * 
 * Unless otherwise specified, all attributes accept static values or EL expressions.
 * 
 * @JSFComponent
 *   name = "t:headerLink"
 *   class = "org.apache.myfaces.custom.collapsiblepanel.HtmlHeaderLink"
 *   tagClass = "org.apache.myfaces.custom.collapsiblepanel.HtmlHeaderLinkTag"
 *
 * @since 1.1.7
 * @author Martin Marinschek (latest modification by $Author: lu4242 $)
 * @version $Revision: 691856 $ $Date: 2008-09-03 21:40:30 -0500 (Wed, 03 Sep 2008) $
 *
 */
public abstract class AbstractHtmlHeaderLink extends HtmlCommandLink
{
    public static final String COMPONENT_TYPE = "org.apache.myfaces.HtmlHeaderLink";
    public static final String DEFAULT_RENDERER_TYPE = "org.apache.myfaces.HeaderLink";
    
    private static final String LINK_ID = "ToggleCollapsed".intern();
    
    public String getClientId(FacesContext context)
    {
        if (context == null) throw new NullPointerException("context");

        String clientId;
        
        //Try to find its nearest parent that extends form HtmlCollapsiblePanel
        //to calculate its id.
        UIComponent collapsiblePanel = findParentCollapsiblePanel(this);
        
        if (collapsiblePanel == null)
        {
            //Calculate its id normally
            clientId = super.getClientId(context);
        }
        else
        {
            //Create its id based on collapsiblePanel id.
            //There only could exists one headerLink per collapsiblePanel.
            String calculatedId = collapsiblePanel.getClientId(context) + LINK_ID;
            
            //Get the original
            clientId = super.getClientId(context);
            
            //just change the final id with the calculated id.
            int lastDoublePointLocation = clientId.lastIndexOf(':');
            clientId = clientId.substring(0,lastDoublePointLocation) +
                calculatedId.substring(lastDoublePointLocation);
        }
        
        return clientId;
    }
    
    protected static UIComponent findParentCollapsiblePanel(UIComponent component)
    {
        UIComponent currentComponent = component;

        // Search for an ancestor that is a instance of HtmlCollapsiblePanel
        while (null != (currentComponent = currentComponent.getParent()))
        {
            if (currentComponent instanceof HtmlCollapsiblePanel)
            {
                break;
            }
        }
        return currentComponent;
    }
    
    /**
     * This property is no longer available since getClientId()
     * is overridden to proper working of collapsiblePanel
     * 
     * @JSFProperty
     *   tagExcluded = "true"
     *   
     * @return
     */
    public Boolean getForceId()
    {
        return Boolean.FALSE;
    }
    
    public void setForceId(Boolean forceId){
        throw new UnsupportedOperationException(); 
    }
    
    /**
     * This property is no longer available since getClientId()
     * is overridden to proper working of collapsiblePanel
     * 
     * @JSFProperty
     *   tagExcluded = "true"
     *   
     * @return
     */
    public Boolean getForceIdIndex()
    {
        return Boolean.TRUE;
    }
    
    public void setForceIdIndex(Boolean forceIdIndex)
    {
        throw new UnsupportedOperationException();
    }

}