/*

 * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package com.sun.xml.internal.stream;

import java.util.NoSuchElementException;

import javax.xml.stream.EventFilter;

import javax.xml.stream.XMLEventReader;

import javax.xml.stream.XMLStreamException;

import javax.xml.stream.events.XMLEvent;

import javax.xml.stream.util.EventReaderDelegate;

/**

 *

 * @author  Neeraj Bajaj, Sun Microsystems

 *

 */

public class EventFilterSupport extends EventReaderDelegate {

    //maintain a reference to EventFilter

    EventFilter fEventFilter ;

    /** Creates a new instance of EventFilterSupport */

    public EventFilterSupport(XMLEventReader eventReader, EventFilter eventFilter) {

        setParent(eventReader);

        fEventFilter = eventFilter;

    }

    public Object next(){

        try{

            return nextEvent();

        }catch(XMLStreamException ex){

            throw new NoSuchElementException();

        }

    }

    public boolean hasNext(){

        try{

            return peek() != null ? true : false ;

        }catch(XMLStreamException ex){

            return false;

        }

    }

    public XMLEvent nextEvent()throws XMLStreamException{

        while (super.hasNext()) {

            //get the next event by calling XMLEventReader

            XMLEvent event = super.nextEvent();

            //if this filter accepts this event then return this event

            if(fEventFilter.accept(event)){

                return event;

            }

        }

        throw new NoSuchElementException();

    }//nextEvent()

     public XMLEvent nextTag() throws XMLStreamException{

         while (super.hasNext()) {

             XMLEvent event = super.nextTag();

             //if the filter accepts this event return this event.

             if(fEventFilter.accept(event)){

                return event;

             }

         }

         throw new NoSuchElementException();

     }

     public XMLEvent peek() throws XMLStreamException{

         while (true) {

             XMLEvent event = super.peek();

             if(event == null)return null;

             //if the filter accepts this event return this event.

             if(fEventFilter.accept(event)){

                return event;

             }

             //call super.next(), and then peek again.

             super.next();

         }

     }

}//EventFilterSupport