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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > xs > traversers > XSDUniqueOrKeyTraverser


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57
58 package com.sun.org.apache.xerces.internal.impl.xs.traversers;
59
60 import com.sun.org.apache.xerces.internal.impl.xs.SchemaGrammar;
61 import com.sun.org.apache.xerces.internal.impl.xs.SchemaSymbols;
62 import com.sun.org.apache.xerces.internal.impl.xs.XSElementDecl;
63 import com.sun.org.apache.xerces.internal.impl.xs.identity.IdentityConstraint;
64 import com.sun.org.apache.xerces.internal.impl.xs.identity.UniqueOrKey;
65 import com.sun.org.apache.xerces.internal.util.DOMUtil;
66 import org.w3c.dom.Element JavaDoc;
67
68 /**
69  * This class contains code that is used to traverse both <key>s and
70  * <unique>s.
71  *
72  * @author Neil Graham, IBM
73  * @version $Id: XSDUniqueOrKeyTraverser.java,v 1.6 2003/05/08 20:11:57 elena Exp $
74  */
75 class XSDUniqueOrKeyTraverser extends XSDAbstractIDConstraintTraverser {
76
77     public XSDUniqueOrKeyTraverser (XSDHandler handler,
78                                   XSAttributeChecker gAttrCheck) {
79         super(handler, gAttrCheck);
80     }
81
82
83     void traverse(Element JavaDoc uElem, XSElementDecl element,
84             XSDocumentInfo schemaDoc, SchemaGrammar grammar) {
85
86         // General Attribute Checking
87 Object JavaDoc[] attrValues = fAttrChecker.checkAttributes(uElem, false, schemaDoc);
88
89         // create identity constraint
90 String JavaDoc uName = (String JavaDoc)attrValues[XSAttributeChecker.ATTIDX_NAME];
91
92         if(uName == null){
93             reportSchemaError("s4s-att-must-appear", new Object JavaDoc [] {DOMUtil.getLocalName(uElem) , SchemaSymbols.ATT_NAME }, uElem);
94             //return this array back to pool
95 fAttrChecker.returnAttrArray(attrValues, schemaDoc);
96             return;
97         }
98
99         UniqueOrKey uniqueOrKey = null;
100         if(DOMUtil.getLocalName(uElem).equals(SchemaSymbols.ELT_UNIQUE)) {
101             uniqueOrKey = new UniqueOrKey(schemaDoc.fTargetNamespace, uName, element.fName, IdentityConstraint.IC_UNIQUE);
102         } else {
103             uniqueOrKey = new UniqueOrKey(schemaDoc.fTargetNamespace, uName, element.fName, IdentityConstraint.IC_KEY);
104         }
105         // it's XSDElementTraverser's job to ensure that there's no
106 // duplication (or if there is that restriction is involved
107 // and there's identity).
108
109         // get selector and fields
110 traverseIdentityConstraint(uniqueOrKey, uElem, schemaDoc, attrValues);
111
112         // and stuff this in the grammar
113 grammar.addIDConstraintDecl(element, uniqueOrKey);
114
115         // and fix up attributeChecker
116 fAttrChecker.returnAttrArray(attrValues, schemaDoc);
117     } // traverse(Element,XSDElementDecl,XSDocumentInfo, SchemaGrammar)
118 } // XSDUniqueOrKeyTraverser
119
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