package org.apache.axis2.databinding.utils;

import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
/*
 * Copyright 2004,2005 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.
 */

public class NamedStaxOMBuilder {

    //wrap a StAXOMBuilder
    private StAXOMBuilder builder;
    private XMLStreamReader reader;
    private QName nameToMatch;

    /**
     *
     * @param xmlStreamReader
     * @param nameToMatch
     */
    public NamedStaxOMBuilder(XMLStreamReader xmlStreamReader, QName nameToMatch) {
        reader = xmlStreamReader;
        builder = new StAXOMBuilder(xmlStreamReader);
        this.nameToMatch = nameToMatch;
    }

    /**
     *
     */
    public OMElement getOMElement(){
        //force to build within the given QName
        boolean done = false;
        int depth = 0;
        while(!done){
            if (reader.getEventType()==XMLStreamConstants.END_ELEMENT){
                depth--;
            }else if (reader.getEventType()==XMLStreamConstants.START_ELEMENT){
                depth++;
            }

            if (depth==0 && reader.getEventType()==XMLStreamConstants.END_ELEMENT &&
                    nameToMatch.equals(reader.getName())){
                done = true;
            }else{
                builder.next();
            }

        }

        return builder.getDocumentElement();
    }



}