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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;

import com.sun.msv.grammar.xmlschema.IdentityConstraint;

/**
 * XPath matcher that tests the selector of an identity constraint.
 * 
 * This object is created whenever an element with identity constraints is found.
 * XML Schema guarantees that we can see if an element has id constraints at the
 * startElement method.
 * 
 * This mathcer then monitor startElement/endElement and find matches to the
 * specified XPath. Every time it finds a match ("target node" in XML Schema
 * terminology), it creates a FieldsMatcher.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class SelectorMatcher extends PathMatcher {
    
    protected IdentityConstraint idConst;

    SelectorMatcher(
                IDConstraintChecker owner, IdentityConstraint idConst,
                String namespaceURI, String localName ) throws SAXException {
        super(owner, idConst.selectors );
        this.idConst = idConst;
        
        // register this scope as active.
        owner.pushActiveScope(idConst,this);
        
        if(com.sun.msv.driver.textui.Debug.debug) {
            System.out.println("new id scope is available for {"+idConst.localName+"}");
        }

        super.start(namespaceURI,localName);
    }

    protected void onRemoved() throws SAXException {
        super.onRemoved();
        // this scope is no longer active.
        owner.popActiveScope(idConst,this);
    }

    
    protected void onElementMatched( String namespaceURI, String localName ) throws SAXException {
        if( com.sun.msv.driver.textui.Debug.debug )
            System.out.println("find a match for a selector: "+idConst.localName);
            
        // this element matches the path.
        owner.add( new FieldsMatcher(this, namespaceURI,localName) );
    }
    
    protected void onAttributeMatched(
        String namespaceURI, String localName, String value, Datatype type ) {
        
        // assertion failed:
        // selectors cannot contain attribute steps.
        throw new Error();
    }
    
}