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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package com.sun.msv.verifier.identity;

import org.relaxng.datatype.Datatype;
import org.xml.sax.SAXException;

/**
 * Base abstract implementation of XPath matcher.
 * 
 * XPath mathcer tracks the startElement event and the endElement event.
 * The characters event is also used by some derived classes.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public abstract class Matcher {
    
    protected final IDConstraintChecker owner;
    Matcher( IDConstraintChecker owner ) {
        this.owner = owner;
    }
    
    protected abstract void startElement( String namespaceURI, String localName ) throws SAXException;
    protected abstract void onAttribute( String namespaceURI, String localName, String value, Datatype type ) throws SAXException;
    protected abstract void endElement( Datatype type ) throws SAXException;
    
    protected void characters( char[] buf, int start, int len ) throws SAXException {
        // do nothing by default.
    }
}