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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.tree.taglib;

import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.view.facelets.ComponentConfig;
import javax.faces.view.facelets.ComponentHandler;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.MetaRuleset;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.webapp.UIComponentTag;

import org.apache.myfaces.custom.tree.HtmlTree;
import org.apache.myfaces.custom.tree.model.DefaultTreeModel;
import org.apache.myfaces.custom.tree.model.TreeModel;
import org.apache.myfaces.custom.tree.model.TreePath;

/**
 * 
 * @since 1.1.7
 */
public class TreeTagHandler extends ComponentHandler
{

    private TagAttribute valueAttr;
    private TagAttribute expandRootAttr;
    
    private boolean expandRoot;
    
    public TreeTagHandler(ComponentConfig config)
    {
        super(config);
        valueAttr = getRequiredAttribute("value");
        expandRootAttr = getRequiredAttribute("expandRoot");
        expandRoot = false;
    }
    
    public void setAttributes(FaceletContext ctx, Object instance)
    {
        super.setAttributes(ctx, instance);
        
        Application app = ctx.getFacesContext().getApplication();
        
        HtmlTree tree = (HtmlTree) instance;
        
        if(valueAttr != null)
        {
            String value = valueAttr.getValue();
            if (value != null && UIComponentTag.isValueReference(value))
            {
                tree.setValueBinding("model", app.createValueBinding(valueAttr
                        .getValue()));
            }
        }
        else
        {
            ValueBinding binding = tree.getValueBinding("model");
            if (binding == null) {
                binding = app.createValueBinding("#{sessionScope.tree}");
            }
            tree.setValueBinding("model", binding);            
        }
        
        if (expandRootAttr != null)
        {
            expandRoot = expandRootAttr.getBoolean(ctx);
        }
    }
    
    public void onComponentCreated(FaceletContext ctx,
            UIComponent component, UIComponent parent)
    {
        FacesContext context = ctx.getFacesContext();
        Application app = ctx.getFacesContext().getApplication();
        
        if (valueAttr != null) {
            String value = valueAttr.getValue();
            if (value != null){
                ValueBinding valueBinding = app.createValueBinding(value);
                TreeModel treeModel = (TreeModel) (valueBinding.getValue(context));
        
                if (treeModel == null) {
                    // create default model
                    treeModel = new DefaultTreeModel();
                    valueBinding.setValue(context, treeModel);
                }
            }
        }
        
        HtmlTree tree = (HtmlTree) component;
        
        if (expandRoot)
        {
            // component was created, so expand the root node
            TreeModel model = tree.getModel(context);
    
            if (model != null) {
                tree.expandPath(new TreePath(new Object[] { model.getRoot() }),
                        context);
            }
        }
        tree.addToModelListeners();
    }
    
    protected MetaRuleset createMetaRuleset(Class type)
    {
        return super.createMetaRuleset(type).alias("class", "styleClass");
    }
}