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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.xerces.impl.xs.traversers;

import org.apache.xerces.impl.xs.SchemaGrammar;
import org.apache.xerces.impl.xs.SchemaSymbols;
import org.apache.xerces.impl.xs.XSAnnotationImpl;
import org.apache.xerces.impl.xs.XSAttributeGroupDecl;
import org.apache.xerces.impl.xs.util.XSObjectListImpl;
import org.apache.xerces.util.DOMUtil;
import org.apache.xerces.util.XMLSymbols;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xs.XSObjectList;
import org.w3c.dom.Element;

/**
 * The attribute group definition schema component traverser.
 *
 * <attributeGroup
 *   id = ID
 *   name = NCName
 *   ref = QName
 *   {any attributes with non-schema namespace . . .}>
 *   Content: (annotation?, ((attribute | attributeGroup)*, anyAttribute?))
 * </attributeGroup>
 *
 * @xerces.internal 
 *
 * @author Rahul Srivastava, Sun Microsystems Inc.
 * @author Sandy Gao, IBM
 *
 * @version $Id: XSDAttributeGroupTraverser.java 819653 2009-09-28 17:29:56Z knoaman $
 */
class XSDAttributeGroupTraverser extends XSDAbstractTraverser {
    
    XSDAttributeGroupTraverser (XSDHandler handler,
            XSAttributeChecker gAttrCheck) {
        
        super(handler, gAttrCheck);
    }
    
    
    XSAttributeGroupDecl traverseLocal(Element elmNode,
            XSDocumentInfo schemaDoc,
            SchemaGrammar grammar) {
        
        // General Attribute Checking for elmNode declared locally
        Object[] attrValues = fAttrChecker.checkAttributes(elmNode, false, schemaDoc);
        
        // get attribute
        QName   refAttr	= (QName)   attrValues[XSAttributeChecker.ATTIDX_REF];
        
        XSAttributeGroupDecl attrGrp = null;
        
        // ref should be here.
        if (refAttr == null) {
            reportSchemaError("s4s-att-must-appear", new Object[]{"attributeGroup (local)", "ref"}, elmNode);
            fAttrChecker.returnAttrArray(attrValues, schemaDoc);
            return null;
        }
        
        // get global decl
        attrGrp = (XSAttributeGroupDecl)fSchemaHandler.getGlobalDecl(schemaDoc, XSDHandler.ATTRIBUTEGROUP_TYPE, refAttr, elmNode);
        
        // no children are allowed here except annotation, which is optional.
        Element child = DOMUtil.getFirstChildElement(elmNode);
        if (child != null) {
            String childName = DOMUtil.getLocalName(child);
            if (childName.equals(SchemaSymbols.ELT_ANNOTATION)) {
                traverseAnnotationDecl(child, attrValues, false, schemaDoc);
                child = DOMUtil.getNextSiblingElement(child);
            } else {
                String text = DOMUtil.getSyntheticAnnotation(child);
                if (text != null) {
                    traverseSyntheticAnnotation(child, text, attrValues, false, schemaDoc);
                }
            }
            
            if (child != null) {
                Object[] args = new Object [] {refAttr.rawname, "(annotation?)", DOMUtil.getLocalName(child)};
                reportSchemaError("s4s-elt-must-match.1", args, child);
            }
        } // if
        
        fAttrChecker.returnAttrArray(attrValues, schemaDoc);
        return attrGrp;
        
    } // traverseLocal
    
    XSAttributeGroupDecl traverseGlobal(Element elmNode,
            XSDocumentInfo schemaDoc,
            SchemaGrammar grammar) {
        
        XSAttributeGroupDecl attrGrp = new XSAttributeGroupDecl();
        
        // General Attribute Checking for elmNode declared globally
        Object[] attrValues = fAttrChecker.checkAttributes(elmNode, true, schemaDoc);
        
        String  nameAttr   = (String) attrValues[XSAttributeChecker.ATTIDX_NAME];
        
        // global declaration must have a name
        if (nameAttr == null) {
            reportSchemaError("s4s-att-must-appear", new Object[]{"attributeGroup (global)", "name"}, elmNode);
            nameAttr = NO_NAME;
        }
        
        attrGrp.fName = nameAttr;
        attrGrp.fTargetNamespace = schemaDoc.fTargetNamespace;
        
        // check the content
        Element child = DOMUtil.getFirstChildElement(elmNode);
        XSAnnotationImpl annotation = null;
        
        if (child!=null && DOMUtil.getLocalName(child).equals(SchemaSymbols.ELT_ANNOTATION)) {
            annotation = traverseAnnotationDecl(child, attrValues, false, schemaDoc);
            child = DOMUtil.getNextSiblingElement(child);
        }
        else {
            String text = DOMUtil.getSyntheticAnnotation(elmNode);
            if (text != null) {
                annotation = traverseSyntheticAnnotation(elmNode, text, attrValues, false, schemaDoc);
            }
        }
        
        // Traverse the attribute and attribute group elements and fill in the 
        // attributeGroup structure
        
        Element nextNode = traverseAttrsAndAttrGrps(child, attrGrp, schemaDoc, grammar, null);
        if (nextNode!=null) {
            // An invalid element was found...
            Object[] args = new Object [] {nameAttr, "(annotation?, ((attribute | attributeGroup)*, anyAttribute?))", DOMUtil.getLocalName(nextNode)};
            reportSchemaError("s4s-elt-must-match.1", args, nextNode);
        } 
        
        if (nameAttr.equals(NO_NAME)) {
            // if a global group doesn't have a name, then don't add it.
            fAttrChecker.returnAttrArray(attrValues, schemaDoc);
            return null;
        }

        // Remove prohibited attributes from the set
        attrGrp.removeProhibitedAttrs();
        
        // check for restricted redefine:
        XSAttributeGroupDecl redefinedAttrGrp = (XSAttributeGroupDecl)fSchemaHandler.getGrpOrAttrGrpRedefinedByRestriction(
                XSDHandler.ATTRIBUTEGROUP_TYPE, 
                new QName(XMLSymbols.EMPTY_STRING, nameAttr, nameAttr, schemaDoc.fTargetNamespace), 
                schemaDoc, elmNode); 
        if(redefinedAttrGrp != null) {
            Object[] errArgs = attrGrp.validRestrictionOf(nameAttr, redefinedAttrGrp);
            if (errArgs != null) {
                reportSchemaError((String)errArgs[errArgs.length-1], errArgs, child);            	
                reportSchemaError("src-redefine.7.2.2", new Object [] {nameAttr, errArgs[errArgs.length-1]}, child);
            }
        }
        
        XSObjectList annotations;
        if (annotation != null) {
            annotations = new XSObjectListImpl();
            ((XSObjectListImpl)annotations).addXSObject (annotation);
        } else {
            annotations = XSObjectListImpl.EMPTY_LIST;
        }
        
        attrGrp.fAnnotations = annotations;
        
        // make an entry in global declarations.
        if (grammar.getGlobalAttributeGroupDecl(attrGrp.fName) == null) {
            grammar.addGlobalAttributeGroupDecl(attrGrp);
        }

        // also add it to extended map
        final String loc = fSchemaHandler.schemaDocument2SystemId(schemaDoc);
        final XSAttributeGroupDecl attrGrp2 = grammar.getGlobalAttributeGroupDecl(attrGrp.fName, loc);
        if (attrGrp2 == null) {
            grammar.addGlobalAttributeGroupDecl(attrGrp, loc);
        }

        // handle duplicates
        if (fSchemaHandler.fTolerateDuplicates) {
            if (attrGrp2 != null) {
                attrGrp = attrGrp2;
            }
            fSchemaHandler.addGlobalAttributeGroupDecl(attrGrp);
        }
        
        fAttrChecker.returnAttrArray(attrValues, schemaDoc);
        return attrGrp;
        
    } // traverseGlobal
    
} // XSDAttributeGroupTraverser