identifiablecontainerbase.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 74 行

/*
 * @(#)IdentifiableContainerBase.java	1.7 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.spi.ior;

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

import com.sun.corba.se.impl.ior.FreezableList ;

import com.sun.corba.se.spi.ior.TaggedComponent ;
import com.sun.corba.se.spi.ior.Identifiable ;

/** Convenience class for defining objects that contain lists of Identifiables.
 * Mainly implements iteratorById.  Also note that the constructor creates the
 * list, which here is always an ArrayList, as this is much more efficient overall
 * for short lists.
 * @author  Ken Cavanaugh
 */
public class IdentifiableContainerBase extends FreezableList
{
    /** Create this class with an empty list of identifiables.
     * The current implementation uses an ArrayList.
     */
    public IdentifiableContainerBase() 
    {
	super( new ArrayList() ) ;
    }
    
    /** Return an iterator which iterates over all contained Identifiables
     * with type given by id.
     */
    public Iterator iteratorById( final int id) 
    {
	return new Iterator() {
	    Iterator iter = IdentifiableContainerBase.this.iterator() ;
	    Object current = advance() ;

	    private Object advance()
	    {
		while (iter.hasNext()) {
		    Identifiable ide = (Identifiable)(iter.next()) ;
		    if (ide.getId() == id)
			return ide ;
		}

		return null ;
	    }

	    public boolean hasNext() 
	    {
		return current != null ;
	    }

	    public Object next()
	    {
		Object result = current ;
		current = advance() ;
		return result ;
	    }

	    public void remove()
	    {
		iter.remove() ;
	    }
	} ;
    }
}