org.apache.wicket.extensions.markup.html.tabs.PanelCachingTab.java Source code

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Here is the source code for org.apache.wicket.extensions.markup.html.tabs.PanelCachingTab.java

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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.wicket.extensions.markup.html.tabs;

import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.model.IModel;

/**
 * A simple decorator that will cache the panel returned from the first call to getPanel()
 * 
 * @see org.apache.wicket.extensions.markup.html.tabs.ITab
 * @see org.apache.wicket.extensions.markup.html.tabs.TabbedPanel
 * 
 * @author Igor Vaynberg (ivaynberg)
 */
public class PanelCachingTab implements ITab {
    private static final long serialVersionUID = 1L;

    // Might Panel or Fragment or ...
    private WebMarkupContainer panel;

    private final ITab delegate;

    /**
     * Constructor
     * 
     * @param delegate
     *            ITab implementation to decorate
     */
    public PanelCachingTab(final ITab delegate) {
        this.delegate = delegate;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public IModel<String> getTitle() {
        return delegate.getTitle();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public WebMarkupContainer getPanel(final String panelId) {
        if (panel == null) {
            panel = delegate.getPanel(panelId);
        }
        return panel;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isVisible() {
        return delegate.isVisible();
    }
}