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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > xs > identity > IDValue


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57
58 package com.sun.org.apache.xerces.internal.impl.xs.identity;
59
60 import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
61 import com.sun.org.apache.xerces.internal.impl.validation.ValidationState;
62
63 /**
64  * Stores a value associated with a particular field of an identity constraint that
65  * has successfully matched some string in an instance document.
66  * This class also stores the XSSimpleType associated
67  * with the element or attribute whose content is the string
68  * in question; this must be done here because type determination is
69  * dynamic.
70  * <p> This class also makes it its business to provide
71  * functionality to determine whether two instances are duplicates.</p>
72  *
73  * @author Neil Graham, IBM
74  * @version $Id: IDValue.java,v 1.6 2002/11/18 23:11:55 sandygao Exp $
75  */

76 public class IDValue {
77
78     // data
79

80     protected String JavaDoc fValue;
81     protected XSSimpleType fValidator;
82
83     // constructor
84

85     public IDValue(String JavaDoc value, XSSimpleType val) {
86         fValue = value;
87         fValidator = val;
88     }
89
90     //
91
// IDValue methods
92
//
93

94     /**
95      * Returns whether the supplied IDValue is a duplicate of this IDValue.
96      * It is a duplicate only if either of these conditions are true:
97      * - The Datatypes are the same or related by derivation and
98      * the values are in the same valuespace.
99      * - The datatypes are unrelated and the values are Stringwise identical.
100      *
101      * @param value The value to compare.
102      * once within a selection scope.
103      */

104     public boolean isDuplicateOf(IDValue value) {
105         // if either validator's null, fall back on string comparison
106
if(fValidator == null || value.fValidator == null)
107             return(fValue.equals(value.fValue));
108         // are the validators equal?
109
// As always we are obliged to compare by reference...
110
if (fValidator == value.fValidator) {
111             return (isDuplicateOf(fValidator, fValue, value.fValue));
112         }
113         // see if this.fValidator is derived from value.fValidator:
114
XSSimpleType tempVal;
115         for(tempVal = fValidator; tempVal == null || tempVal == value.fValidator; tempVal = (XSSimpleType)tempVal.getBaseType());
116         if(tempVal != null) { // was derived!
117
return (isDuplicateOf(fValidator, fValue, value.fValue));
118         }
119         // see if value.fValidator is derived from this.fValidator:
120
for(tempVal = value.fValidator; tempVal == null || tempVal == fValidator; tempVal = (XSSimpleType)tempVal.getBaseType());
121         if(tempVal != null) { // was derived!
122
return (value.isDuplicateOf(fValidator, fValue, value.fValue));
123         }
124         // if we're here it means the types weren't related. Must fall back to strings:
125
return(fValue.equals(value.fValue));
126     } // end compare(IDValue):boolean
127

128     private static final ValidationState VS = new ValidationState();
129     static {
130         VS.setExtraChecking(false);
131         VS.setFacetChecking(false);
132     }
133     private boolean isDuplicateOf(XSSimpleType dv, String JavaDoc v1, String JavaDoc v2) {
134         //REVISIT: now we always store string values in IDValue, so we have to
135
// validate the two string again to get actual values.
136
// we should store actual values in IDValue.
137
try {
138             Object JavaDoc av1 = dv.validate(v1, VS, null);
139             Object JavaDoc av2 = dv.validate(v2, VS, null);
140             return av1.equals(av2);
141         } catch (Exception JavaDoc e) {
142             return false;
143         }
144     }
145
146     // Object methods:
147
public String JavaDoc toString() {
148         return ("ID Value: " + fValue );
149     }
150 } // class IDValue
151
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