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package com.sun.org.apache.xerces.internal.util;

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 *
 * @author  Neeraj Bajaj, Sun Microsystems
 */

Its better to extend the functionality of existing XMLAttributesImpl and also make it of type Iterator.
We can directly  give an object of type iterator from StartElement event. We should also have
Attribute object of type javax.xml.stream.Attribute internally. It would avoid the need of creating
new javax.xml.stream.Attribute object at the later stage.
Should we change XMLAttributes interface to implement Iteraotr ? I think its better avoid touching XNI as
much as possible. - NB.
/**
 * Its better to extend the functionality of existing XMLAttributesImpl and also make it of type Iterator.
 * We can directly  give an object of type iterator from StartElement event. We should also have
 * Attribute object of type javax.xml.stream.Attribute internally. It would avoid the need of creating
 * new javax.xml.stream.Attribute object at the later stage.
 *
 * Should we change XMLAttributes interface to implement Iteraotr ? I think its better avoid touching XNI as
 * much as possible. - NB.
 */

public class XMLAttributesIteratorImpl extends XMLAttributesImpl implements
        Iterator<XMLAttributesImpl.Attribute> {

    //pointer to current position.
    protected int fCurrent = 0 ;

    protected XMLAttributesImpl.Attribute fLastReturnedItem ;

    
Creates a new instance of XMLAttributesIteratorImpl /** Creates a new instance of XMLAttributesIteratorImpl */
    public XMLAttributesIteratorImpl() {
    }

    public boolean hasNext() {
        return fCurrent < getLength() ? true : false ;
    }//hasNext()

    public XMLAttributesImpl.Attribute next() {
        if(hasNext()){
            // should this be of type javax.xml.stream.Attribute ?
            return fLastReturnedItem = fAttributes[fCurrent++] ;
        }
        else{
            throw new NoSuchElementException() ;
        }
    }//next

    public void remove() {
        //make sure that only last returned item can be removed.
        if(fLastReturnedItem == fAttributes[fCurrent - 1]){
            //remove the attribute at current index and lower the current position by 1.
            removeAttributeAt(fCurrent--) ;
        }
        else {
            //either the next method has been called yet, or the remove method has already been called
            //after the last call to the next method.
            throw new IllegalStateException();
        }
    }//remove

    public void removeAllAttributes() {
        super.removeAllAttributes() ;
        fCurrent = 0 ;
    }
    /** xxx: should we be doing this way ? Attribute event defines so many functions which doesn't make any sense
     *for Attribute.
     *
     */
    /*
    class AttributeImpl extends com.sun.org.apache.xerces.internal.util.XMLAttributesImpl.Attribute implements javax.xml.stream.events.Attribute{

    }
     */

} //XMLAttributesIteratorImpl