/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.felix.scr.impl.parser;


import java.io.Reader;
import java.util.Properties;

import org.kxml2.io.KXmlParser;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;


/**
 * The KXml2SAXParser extends the XmlParser from kxml. This is a very
 * simple parser that does not take into account the DTD
 *
 */
public class KXml2SAXParser extends KXmlParser
{

    /**
    * The constructor for a parser, it receives a java.io.Reader.
    *
    * @param   reader  The reader
    * @throws XmlPullParserException
    */
    public KXml2SAXParser( Reader reader ) throws XmlPullParserException
    {
        super();
        setInput( reader );
        setFeature( FEATURE_PROCESS_NAMESPACES, true );
    }


    /**
    * Parser from the reader provided in the constructor, and call
    * the startElement and endElement in a KxmlHandler
    *
    * @param   handler  The handler
    * @exception   Exception thrown by the superclass
    */
    public void parseXML( KXml2SAXHandler handler ) throws Exception
    {

        while ( next() != XmlPullParser.END_DOCUMENT )
        {
            handler.setLineNumber( getLineNumber() );
            handler.setColumnNumber( getColumnNumber() );
            if ( getEventType() == XmlPullParser.START_TAG )
            {
                Properties props = new Properties();
                for ( int i = 0; i < getAttributeCount(); i++ )
                {
                    props.put( getAttributeName( i ), getAttributeValue( i ) );
                }
                handler.startElement( getNamespace(), getName(), props );
            }
            else if ( getEventType() == XmlPullParser.END_TAG )
            {
                handler.endElement( getNamespace(), getName() );
            }
            else if ( getEventType() == XmlPullParser.TEXT )
            {
                String text = getText();
                handler.characters( text );
            }
            else if ( getEventType() == XmlPullParser.PROCESSING_INSTRUCTION )
            {
                // TODO extract the target from the evt.getText()
                handler.processingInstruction( null, getText() );
            }
            else
            {
                // do nothing
            }
        }
    }
}