org.apache.myfaces.custom.tree.taglib.IconProviderTag 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.tree.taglib;

import org.apache.myfaces.shared_tomahawk.util.ClassUtils;
import org.apache.myfaces.custom.tree.HtmlTree;
import org.apache.myfaces.custom.tree.IconProvider;

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;


/**
 * @JSFJspTag
 *   name="t:iconProvider"
 *   bodyContent="empty"
 *   tagHandler="org.apache.myfaces.custom.tree.taglib.IconProviderTagHandler"
 *   
 * @author Oliver Rossmueller
 * @version $Revision: 666398 $ $Date: 2008-06-10 19:13:17 -0500 (Tue, 10 Jun 2008) $
 */
public class IconProviderTag
    extends TagSupport
{
    private static final long serialVersionUID = -8851450834386187922L;
    private String type = null;


    public IconProviderTag()
    {
    }

    /**
     * @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("IconProviderTag has no UIComponentTag ancestor");
        }

        UIComponent component = componentTag.getComponentInstance();
        if (component instanceof HtmlTree)
        {
            String className;
            if (UIComponentTag.isValueReference(type))
            {
                FacesContext facesContext = FacesContext.getCurrentInstance();
                ValueBinding vb = facesContext.getApplication().createValueBinding(type);
                className = (String) vb.getValue(facesContext);
            } else
            {
                className = type;
            }
            IconProvider provider = (IconProvider) ClassUtils.newInstance(className);
            ((HtmlTree) component).setIconProvider(provider);
        } else
        {
            throw new JspException("Component " + component.getId() + " is no HtmlTree");
        }

        return Tag.SKIP_BODY;
    }
}