src/org/apache/xerces/impl/xs/traversers/XSDUniqueOrKeyTraverser.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
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 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 5. Products derived from this software may not be called "Apache",
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 *
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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package org.apache.xerces.impl.xs.traversers;

import  org.apache.xerces.impl.XMLErrorReporter;
import org.apache.xerces.impl.xs.SchemaGrammar;
import org.apache.xerces.impl.xs.SchemaSymbols;
import org.apache.xerces.impl.xs.XSElementDecl;
import  org.apache.xerces.util.DOMUtil;
import  org.w3c.dom.Element;
import org.apache.xerces.impl.xs.identity.*;
import org.apache.xerces.impl.xpath.*;

/**
 * This class contains code that is used to traverse both <key>s and
 * <unique>s.
 *
 * @author Neil Graham, IBM
 * @version $Id$
 */
class XSDUniqueOrKeyTraverser extends XSDAbstractIDConstraintTraverser {

    public XSDUniqueOrKeyTraverser (XSDHandler handler,
                                  XSAttributeChecker gAttrCheck) {
        super(handler, gAttrCheck);
    }


    void traverse(Element uElem, XSElementDecl element,
            XSDocumentInfo schemaDoc, SchemaGrammar grammar) {

        // General Attribute Checking
        Object[] attrValues = fAttrChecker.checkAttributes(uElem, false, schemaDoc);

        // create identity constraint
        String uName = (String)attrValues[XSAttributeChecker.ATTIDX_NAME];

        if(uName == null){
            reportSchemaError("s4s-att-must-appear", new Object [] {DOMUtil.getLocalName(uElem) , SchemaSymbols.ATT_NAME });
            //return this array back to pool
            fAttrChecker.returnAttrArray(attrValues, schemaDoc);
            return;
        }

        UniqueOrKey uniqueOrKey = null;
        if(DOMUtil.getLocalName(uElem).equals(SchemaSymbols.ELT_UNIQUE)) {
            uniqueOrKey = new UniqueOrKey(uName, element.fName, IdentityConstraint.UNIQUE);
        } else {
            uniqueOrKey = new UniqueOrKey(uName, element.fName, IdentityConstraint.KEY);
        }
        // it's XSDElementTraverser's job to ensure that there's no
        // duplication (or if there is that restriction is involved
        // and there's identity).

        // get selector and fields
        traverseIdentityConstraint(uniqueOrKey, uElem, schemaDoc, attrValues);

        // and stuff this in the grammar
        grammar.addIDConstraintDecl(element, uniqueOrKey);

        // and fix up attributeChecker
        fAttrChecker.returnAttrArray(attrValues, schemaDoc);
    } // traverse(Element,XSDElementDecl,XSDocumentInfo, SchemaGrammar)
} // XSDUniqueOrKeyTraverser