/*
 * 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.wicket.behavior;

import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.settings.DebugSettings;
import org.apache.wicket.util.lang.Classes;

/**
 * <p>A behavior that applies to {@link MarkupContainer}s with associated markup.
 * It adds an attribute named <em>namespace:className</em> to
 * the markup element of {@link ComponentTag} with value the fully
 * qualified class name of the markup container.</p>
 *
 * <p>It is used internally by Wicket when {@link org.apache.wicket.settings.DebugSettings.ClassOutputStrategy#TAG_ATTRIBUTE} is active.</p>
 *
 * @see DebugSettings#setOutputMarkupContainerClassNameStrategy(DebugSettings.ClassOutputStrategy)  
 */
public class OutputMarkupContainerClassNameBehavior extends Behavior {

    public static final OutputMarkupContainerClassNameBehavior INSTANCE = new OutputMarkupContainerClassNameBehavior();

    private OutputMarkupContainerClassNameBehavior()
    {}

    @Override
    public void onComponentTag(Component component, ComponentTag tag) {
        super.onComponentTag(component, tag);

        if (component instanceof MarkupContainer)
        {
            String namespace = tag.getNamespace();
            if (namespace == null)
            {
                namespace = "wicket";
            }
            tag.put(namespace + ":className", Classes.name(component.getClass()));
        }
    }

    @Override
    public boolean isTemporary(Component component) {
        return true;
    }
}
