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

import java.io.IOException;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLParserConfiguration;

import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.SAXNotRecognizedException;

/**
 * Base class of all XML-related parsers.
 * 
 * In addition to the features and properties recognized by the parser
 * configuration, this parser recognizes these additional features and
 * properties:
 * 

 * Properties
 *  
 *   http://apache.org/xml/properties/internal/error-handler
 *   http://apache.org/xml/properties/internal/entity-resolver
 *  
 * 
 *
 * @author Arnaud  Le Hors, IBM
 * @author Andy Clark, IBM
 *
 * @version $Id: XMLParser.java,v 1.7 2010-11-01 04:40:10 joehw Exp $
 */
public abstract class XMLParser {

    //
    // Constants
    //

    // properties

    /** Property identifier: entity resolver. */
    protected static final String ENTITY_RESOLVER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;

    /** Property identifier: error handler. */
    protected static final String ERROR_HANDLER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;

    /** Recognized properties. */
    private static final String[] RECOGNIZED_PROPERTIES = {
        ENTITY_RESOLVER,
        ERROR_HANDLER,
    };

    //
    // Data
    //

    /** The parser configuration. */
    protected XMLParserConfiguration fConfiguration;

    //
    // Constructors
    //

    /**
     * Query the state of a feature.
     */
    public boolean getFeature(String featureId) 
            throws SAXNotSupportedException, SAXNotRecognizedException {
        return fConfiguration.getFeature(featureId);

    }
    
    /**
     * Default Constructor.
     */
    protected XMLParser(XMLParserConfiguration config) {

        // save configuration
        fConfiguration = config;

        // add default recognized properties
        fConfiguration.addRecognizedProperties(RECOGNIZED_PROPERTIES);

    } // (XMLParserConfiguration)

    //
    // Public methods
    //

    /**
     * parse
     *
     * @param inputSource
     *
     * @exception XNIException
     * @exception java.io.IOException
     */
    public void parse(XMLInputSource inputSource) 
        throws XNIException, IOException {

        reset();
        fConfiguration.parse(inputSource);

    } // parse(XMLInputSource) 

    //
    // Protected methods
    //

    /**
     * reset all components before parsing
     */
    protected void reset() throws XNIException {
    } // reset()

} // class XMLParser