XSDKeyrefTraverser


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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.KeyRef;
65  import com.sun.org.apache.xerces.internal.impl.xs.identity.UniqueOrKey;
66  import com.sun.org.apache.xerces.internal.xni.QName;
67  import org.w3c.dom.Element  ;
68  
69  /**
70   * This class contains code that is used to traverse <keyref>s.
71   *
72   * @author Neil Graham, IBM
73   * @version $Id: XSDKeyrefTraverser.java,v 1.6 2003/05/08 20:11:57 elena Exp $
74   */
75  class XSDKeyrefTraverser extends XSDAbstractIDConstraintTraverser {
76  
77      public XSDKeyrefTraverser (XSDHandler handler,
78                                    XSAttributeChecker gAttrCheck) {
79          super(handler, gAttrCheck);
80      }
81  
82      void traverse(Element   krElem, XSElementDecl element,
83              XSDocumentInfo schemaDoc, SchemaGrammar grammar) {
84  
85          // General Attribute Checking
86          Object  [] attrValues = fAttrChecker.checkAttributes(krElem, false, schemaDoc);
87  
88          // create identity constraint
89          String   krName = (String  )attrValues[XSAttributeChecker.ATTIDX_NAME];
90          if(krName == null){
91              reportSchemaError("s4s-att-must-appear", new Object   [] {SchemaSymbols.ELT_KEYREF , SchemaSymbols.ATT_NAME }, krElem);
92              //return this array back to pool
93              fAttrChecker.returnAttrArray(attrValues, schemaDoc);
94              return;
95          }
96          QName kName = (QName)attrValues[XSAttributeChecker.ATTIDX_REFER];
97          if(kName == null){
98              reportSchemaError("s4s-att-must-appear", new Object   [] {SchemaSymbols.ELT_KEYREF , SchemaSymbols.ATT_REFER }, krElem);
99              //return this array back to pool
100             fAttrChecker.returnAttrArray(attrValues, schemaDoc);
101             return;
102         }
103 
104         UniqueOrKey key = null;
105         IdentityConstraint ret = (IdentityConstraint)fSchemaHandler.getGlobalDecl(schemaDoc, XSDHandler.IDENTITYCONSTRAINT_TYPE, kName, krElem);
106         // if ret == null, we've already reported an error in getGlobalDecl
107         // we report an error only when ret != null, and the return type keyref
108         if (ret != null) {
109             if (ret.getCategory() == IdentityConstraint.IC_KEY ||
110                 ret.getCategory() == IdentityConstraint.IC_UNIQUE) {
111                 key = (UniqueOrKey)ret;
112             } else {
113                 reportSchemaError("src-resolve", new Object  []{kName.rawname, "identity constraint key/unique"}, krElem);
114             }
115         }
116 
117         if(key == null) {
118             fAttrChecker.returnAttrArray(attrValues, schemaDoc);
119             return;
120         }
121 
122         KeyRef keyRef = new KeyRef(schemaDoc.fTargetNamespace, krName, element.fName, key);
123 
124         // add to element decl
125         traverseIdentityConstraint(keyRef, krElem, schemaDoc, attrValues);
126 
127         //Schema Component Constraint: Identity-constraint Definition Properties Correct
128         //2 If the {identity-constraint category} is keyref, the cardinality of the {fields} must equal that of the {fields} of the {referenced key}.
129         if(key.getFieldCount() != keyRef.getFieldCount()) {
130             reportSchemaError("c-props-correct.2" , new Object   [] {krName,key.getIdentityConstraintName()}, krElem);
131         } else {
132             // add key reference to element decl
133             // and stuff this in the grammar
134             grammar.addIDConstraintDecl(element, keyRef);
135         }
136 
137         // and put back attributes
138         fAttrChecker.returnAttrArray(attrValues, schemaDoc);
139     } // traverse(Element,int,XSDocumentInfo, SchemaGrammar)
140 } // XSDKeyrefTraverser
141 
142
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