xsdelementtraverser.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2004 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
 *    notice, this list of conditions and the following disclaimer in
 *    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.
 *
 * 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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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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/>.
 */

package com.sun.org.apache.xerces.internal.impl.xs.traversers;

import com.sun.org.apache.xerces.internal.impl.dv.ValidatedInfo;
import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
import com.sun.org.apache.xerces.internal.impl.xs.SchemaGrammar;
import com.sun.org.apache.xerces.internal.impl.xs.SchemaSymbols;
import com.sun.org.apache.xerces.internal.impl.xs.XSAnnotationImpl;
import com.sun.org.apache.xerces.internal.impl.xs.XSComplexTypeDecl;
import com.sun.org.apache.xerces.internal.impl.xs.XSConstraints;
import com.sun.org.apache.xerces.internal.impl.xs.XSElementDecl;
import com.sun.org.apache.xerces.internal.impl.xs.XSParticleDecl;
import com.sun.org.apache.xerces.internal.xs.XSConstants;
import com.sun.org.apache.xerces.internal.xs.XSObject;
import com.sun.org.apache.xerces.internal.xs.XSTypeDefinition;
import com.sun.org.apache.xerces.internal.impl.xs.util.XInt;
import com.sun.org.apache.xerces.internal.util.DOMUtil;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.QName;
import org.w3c.dom.Element;
import org.w3c.dom.Attr;

/**
 * The element declaration schema component traverser.
 * <element
 *   abstract = boolean : false
 *   block = (#all | List of (extension | restriction | substitution))
 *   default = string
 *   final = (#all | List of (extension | restriction))
 *   fixed = string
 *   form = (qualified | unqualified)
 *   id = ID
 *   maxOccurs = (nonNegativeInteger | unbounded)  : 1
 *   minOccurs = nonNegativeInteger : 1
 *   name = NCName
 *   nillable = boolean : false
 *   ref = QName
 *   substitutionGroup = QName
 *   type = QName
 *   {any attributes with non-schema namespace . . .}>
 *   Content: (annotation?, ((simpleType | complexType)?, (unique | key | keyref)*))
 * </element>
 *
 * @author Sandy Gao, IBM
 *
 * @version $Id: XSDElementTraverser.java,v 1.29 2004/02/03 17:27:45 sandygao Exp $
 */
class XSDElementTraverser extends XSDAbstractTraverser {

    protected final XSElementDecl  fTempElementDecl  = new XSElementDecl();

    // this controls what happens when a local element is encountered.
    // We may not encounter all local elements when first parsing.
    boolean fDeferTraversingLocalElements;

    XSDElementTraverser (XSDHandler handler,
                         XSAttributeChecker gAttrCheck) {
        super(handler, gAttrCheck);
    }

    /**
     * Traverse a locally declared element (or an element reference).
     *
     * To handle the recursive cases efficiently, we delay the traversal
     * and return an empty particle node. We'll fill in this particle node
     * later after we've done with all the global declarations.
     * This method causes a number of data structures in the schema handler to be filled in.
     *
     * @param  elmDecl
     * @param  schemaDoc
     * @param  grammar
     * @return the particle
     */
    XSParticleDecl traverseLocal(Element elmDecl,
                                 XSDocumentInfo schemaDoc,
                                 SchemaGrammar grammar,
                                 int allContextFlags,
                                 XSObject parent) {

        XSParticleDecl particle = null;
        if (fSchemaHandler.fDeclPool !=null) {
            particle = fSchemaHandler.fDeclPool.getParticleDecl();
        } else {
            particle = new XSParticleDecl();
        }
        if(fDeferTraversingLocalElements) {
            // The only thing we care about now is whether this element has
            // minOccurs=0. This affects (if the element appears in a complex
            // type) whether a type has emptiable content.
            particle.fType = XSParticleDecl.PARTICLE_ELEMENT;
            Attr attr = elmDecl.getAttributeNode(SchemaSymbols.ATT_MINOCCURS);
            if (attr != null) {
                String min = attr.getValue();
                try {
                    int m = Integer.parseInt(min.trim());
                    if (m >= 0)
                        particle.fMinOccurs = m;
                }
                catch (NumberFormatException ex) {
                }
            }
            fSchemaHandler.fillInLocalElemInfo(elmDecl, schemaDoc, allContextFlags, parent, particle);
        } else {
            traverseLocal(particle, elmDecl, schemaDoc, grammar, allContextFlags, parent);
            // If it's an empty particle, return null.
            if (particle.fType == XSParticleDecl.PARTICLE_EMPTY)
                particle = null;
        }

        return particle;
    }

    /**
     * Traverse a locally declared element (or an element reference).
     *
     * This is the real traversal method. It's called after we've done with
     * all the global declarations.
     *
     * @param  index
     */
    protected void traverseLocal(XSParticleDecl particle,
                                 Element elmDecl,
                                 XSDocumentInfo schemaDoc,
                                 SchemaGrammar grammar,
                                 int allContextFlags,
                                 XSObject parent) {

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

        QName refAtt = (QName) attrValues[XSAttributeChecker.ATTIDX_REF];
        XInt  minAtt = (XInt)  attrValues[XSAttributeChecker.ATTIDX_MINOCCURS];
        XInt  maxAtt = (XInt)  attrValues[XSAttributeChecker.ATTIDX_MAXOCCURS];

        XSElementDecl element = null;
        if (elmDecl.getAttributeNode(SchemaSymbols.ATT_REF) != null) {
            if (refAtt != null) {
                element = (XSElementDecl)fSchemaHandler.getGlobalDecl(schemaDoc, XSDHandler.ELEMENT_TYPE, refAtt, elmDecl);

                Element child = DOMUtil.getFirstChildElement(elmDecl);
                if (child != null && DOMUtil.getLocalName(child).equals(SchemaSymbols.ELT_ANNOTATION)) {
                    // REVISIT:  put this somewhere
                    traverseAnnotationDecl(child, attrValues, false, schemaDoc);
                    child = DOMUtil.getNextSiblingElement(child);
                }

                // Element Declaration Representation OK
                // 2 If the item's parent is not <schema>, then all of the following must be true:
                // 2.1 One of ref or name must be present, but not both.
                // 2.2 If ref is present, then all of <complexType>, <simpleType>, <key>, <keyref>, <unique>, nillable, default, fixed, form, block and type must be absent, i.e. only minOccurs, maxOccurs, id are allowed in addition to ref, along with <annotation>.
                if (child != null) {
                    reportSchemaError("src-element.2.2", new Object[]{refAtt.rawname, DOMUtil.getLocalName(child)}, child);
                }
            } else {
                element = null;
            }
        } else {
            element = traverseNamedElement(elmDecl, attrValues, schemaDoc, grammar, false, parent);
        }

        particle.fMinOccurs = minAtt.intValue();
        particle.fMaxOccurs = maxAtt.intValue();
        if (element != null) {
            particle.fType = XSParticleDecl.PARTICLE_ELEMENT;
            particle.fValue = element;
        }
        else {
            particle.fType = XSParticleDecl.PARTICLE_EMPTY;
        }
        Long defaultVals = (Long)attrValues[XSAttributeChecker.ATTIDX_FROMDEFAULT];
        checkOccurrences(particle, SchemaSymbols.ELT_ELEMENT,
                         (Element)elmDecl.getParentNode(), allContextFlags,
                         defaultVals.longValue());

        fAttrChecker.returnAttrArray(attrValues, schemaDoc);
    }

    /**
     * Traverse a globally declared element.
     *
     * @param  elmDecl
     * @param  schemaDoc
     * @param  grammar
     * @return the element declaration
     */
    XSElementDecl traverseGlobal(Element elmDecl,
                                 XSDocumentInfo schemaDoc,
                                 SchemaGrammar grammar) {

        // General Attribute Checking
        Object[] attrValues = fAttrChecker.checkAttributes(elmDecl, true, schemaDoc);
        XSElementDecl element = traverseNamedElement(elmDecl, attrValues, schemaDoc, grammar, true, null);
        fAttrChecker.returnAttrArray(attrValues, schemaDoc);
        return element;

    }

    /**
     * Traverse a globally declared element.