/*
* Copyright 2000-2001,2004 The Apache Software Foundation.
*
* Licensed 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.jetspeed.om.registry.base;
import java.util.Iterator;
import java.util.Vector;
import java.util.NoSuchElementException;
import java.lang.UnsupportedOperationException;
import java.lang.IllegalStateException;
import org.apache.jetspeed.services.Registry;
/**
* PortletIterator - seamless iterator over nested vectors of portlet collections
*
*
* @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
* @version $Id: PortletIterator.java,v 1.3 2004/02/23 03:08:26 jford Exp $
*/
public class PortletIterator implements Iterator
{
protected BasePortletEntry entry;
protected String method;
protected Vector vector ;
protected int index = 0;
public PortletIterator(BasePortletEntry entry, String method)
{
this.entry = entry;
this.method = method;
this.vector = getVector();
}
public boolean hasNext()
{
int size = vector.size();
if (size == 0)
return false;
if (index >= size)
{
entry = getParentEntry(entry);
if (entry == null)
return false;
vector = getVector();
if (vector == null)
{
return false;
}
index = 0;
if (vector.size() == 0)
return false;
}
return true;
}
public void remove() throws IllegalStateException, UnsupportedOperationException
{
throw new UnsupportedOperationException("The remove() method is not supported");
}
protected BasePortletEntry getParentEntry(BasePortletEntry entry)
{
String parentName = entry.getParent();
if (parentName == null || parentName.equals(""))
return null;
BasePortletEntry parent = null;
parent = (BasePortletEntry)Registry.getEntry( Registry.PORTLET, entry.getParent() );
return parent;
}
public Object next() throws NoSuchElementException
{
Object o = vector.elementAt(index);
index++;
return o;
}
protected Vector getVector()
{
try
{
this.vector = (Vector)this.entry.getClass().getMethod(this.method, null).invoke(this.entry, null);
}
catch (Exception e)
{
this.vector = null;
}
return this.vector;
}
}