core/src/main/java/org/apache/myfaces/tobago/component/UIDefaultLayout.java

package org.apache.myfaces.tobago.component;

/*
 * 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.
 */

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_INNER_HEIGHT;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_INNER_WIDTH;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_LAYOUT_HEIGHT;
import static org.apache.myfaces.tobago.TobagoConstants.ATTR_LAYOUT_WIDTH;
import static org.apache.myfaces.tobago.TobagoConstants.RENDERER_TYPE_DEFAULT_LAYOUT;

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

public class UIDefaultLayout extends UILayout {
  private static final Log LOG = LogFactory.getLog(UIDefaultLayout.class);

  public static final String COMPONENT_TYPE = "org.apache.myfaces.tobago.DefaultLayout";
  public static final String COMPONENT_FAMILY = "org.apache.myfaces.tobago.Layout";


  private static UIDefaultLayout instance;

  public static synchronized UIDefaultLayout getInstance() {
    if (instance == null) {
      instance = (UIDefaultLayout)
          ComponentUtil.createComponent(COMPONENT_TYPE, RENDERER_TYPE_DEFAULT_LAYOUT);
      instance.setId("UIDefaultLayout");
    }
    return instance;
  }

  public void layoutBegin(FacesContext facesContext, UIComponent component) {
    super.layoutBegin(facesContext, component);
    //TODO why is this needed? 
    for (Object child : component.getChildren()) {
      ((UIComponent) child).getAttributes().remove(ATTR_INNER_WIDTH);
      ((UIComponent) child).getAttributes().remove(ATTR_INNER_HEIGHT);
      ((UIComponent) child).getAttributes().remove(ATTR_LAYOUT_WIDTH);
      ((UIComponent) child).getAttributes().remove(ATTR_LAYOUT_HEIGHT);
    }
  }

  public String getFamily() {
    return COMPONENT_FAMILY;
  }

}