/*
 * 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.cocoon.portal.layout.impl;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.cocoon.portal.layout.AbstractLayout;
import org.apache.cocoon.portal.layout.CompositeLayout;
import org.apache.cocoon.portal.layout.Item;
import org.apache.cocoon.portal.layout.Layout;
import org.apache.cocoon.util.ClassUtils;


/**
 * A composite layout is a layout that contains other layouts.
 * 
 * @author <a href="mailto:cziegeler@s-und-n.de">Carsten Ziegeler</a>
 * @author <a href="mailto:volker.schmitt@basf-it-services.com">Volker Schmitt</a>
 * 
 * @version CVS $Id$
 */
public class CompositeLayoutImpl 
    extends AbstractLayout
    implements CompositeLayout {

    protected List items = new ArrayList(3);

    /** The class name of the items */
    protected String itemClassName;
    
    /**
     * Constructor
     */
    public CompositeLayoutImpl() {
        // nothing to do
    }
    
	/**
	 * Add indexed item to the itemList.
	 * @param index index for the position inside the list
	 * @param item item to add
	 */
	public final void addItem(int index, Item item) {
		this.items.add(index, item);
        item.setParent(this);
	}

	/**
	 * Add Item to the ItemList.
	 * @param item item to add
	 */
	public final void addItem(Item item) {
		this.items.add(item);
		item.setParent(this);
	}

	/**
	 * Get Item from the ItemList.
	 * @return Item
	 */
	public final Item getItem(int index) {
		return (Item) this.items.get(index);
	}

	/**
	 * Get the ItemList.
	 * @return items
	 */
	public final List getItems() {
		return this.items;
	}

	/**
	 * Get size of ItemList.
	 * @return size
	 */
	public final int getSize() {
		return this.items.size();
	}
    
    public final void removeItem(Item item) {
        this.items.remove(item);
        item.setParent(null);
    }
    
    /* (non-Javadoc)
     * @see org.apache.cocoon.portal.layout.CompositeLayout#createNewItem()
     */
    public Item createNewItem() {
        if ( this.itemClassName == null ) {
            return new Item();
        }
        try {
            return (Item)ClassUtils.newInstance(this.itemClassName);
        } catch (Exception ignore) {
            return new Item();
        }
    }
        
    /**
     * @return Returns the item class name.
     */
    public String getItemClassName() {
        return this.itemClassName;
    }
    
    /**
     * @param value The item class name to set.
     */
    public void setItemClassName(String value) {
        this.itemClassName = value;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#clone()
     */
    protected Object clone() throws CloneNotSupportedException {
        CompositeLayoutImpl clone = (CompositeLayoutImpl)super.clone();
        
        // we are not cloning the items
        clone.items = new ArrayList();

        return clone;
    }
    
    /* (non-Javadoc)
     * @see org.apache.cocoon.portal.layout.Layout#copy(java.util.Map)
     */
    public Layout copy() {
        CompositeLayoutImpl clone = (CompositeLayoutImpl)super.copy();
        final Iterator i = this.items.iterator();
        while ( i.hasNext() ) {
            final Item current = (Item)i.next();
            final Item clonedItem = current.copy(clone);
            clone.addItem(clonedItem);
        }
        return clone;
    }
    
}