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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.widget;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.View;
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import com.tirsen.angkor.Component;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Default implementation of a component that contains other components.
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*
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* <!-- $Id: Container.java,v 1.4 2002/10/13 19:59:23 tirsen Exp $ -->
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*
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* @author $Author: tirsen $
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* @version $Revision: 1.4 $
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*/
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public class Container extends Component
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{
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protected List children = new ArrayList();
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private boolean childrenCreated = false;
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public Container()
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{
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}
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public Container(String id)
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{
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super(id);
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}
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/**
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* Iterates the collection even if it is <code>null</code>.
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*/
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protected static Iterator iterateCollection(Collection coll)
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{
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Iterator it;
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if (coll == null)
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{
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it = Collections.EMPTY_LIST.iterator();
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}
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else
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{
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it = coll.iterator();
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}
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return it;
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}
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public void renderChildren(RenderContext context) throws IOException
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{
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Collection elements = getChildren();
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Iterator iterator = iterateCollection(elements);
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while (iterator.hasNext())
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{
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View element = (View) iterator.next();
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element.render(context);
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}
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}
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public List getChildren()
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{
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maybeCreateChildren();
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return children;
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}
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public int getNumberOfChildren()
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{
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return getChildren().size();
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}
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/**
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* Iterates <em>all</em> elements of this container, not just the main elements.
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*/
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public Iterator iterateAllElements()
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{
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return iterateCollection(getChildren());
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}
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/**
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* Inserts main element at specified index. All other add-methods call this method, thus subclasses
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* only need to overload this method to provide additional behaviour.
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*/
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public void add(int index, View element)
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{
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element.setContainer(this);
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getChildren().add(index, element);
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}
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/**
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* Add a main element.
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*/
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public void add(View element)
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{
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add(getChildren().size(), element);
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}
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/**
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* Remove a main element.
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*/
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public void remove(Component element)
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{
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getChildren().remove(element);
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element.setContainer(null);
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}
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public void parse(RenderContext context)
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{
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super.parse(context);
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if (isVisible())
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{
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for (Iterator iterator = iterateAllElements(); iterator.hasNext();)
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{
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View element = (View) iterator.next();
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element.parse(context);
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}
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}
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}
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public void render(RenderContext context) throws IOException
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{
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renderChildren(context);
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}
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/**
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* Overload to create any default children in subclasses. Will be executed before any children
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* is actually needed by the framework.
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*/
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6
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protected void createChildren()
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{
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// no default children
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}
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30
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protected void maybeCreateChildren()
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{
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if (!isChildrenCreated())
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{
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childrenCreated = true;
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6
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createChildren();
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}
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}
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public boolean isChildrenCreated()
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{
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return childrenCreated;
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}
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}
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