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Java > Open Source Codes > org > enhydra > apache > xerces > validators > schema > identity > IDValue


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 2001 The Apache Software Foundation.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Xerces" and "Apache Software Foundation" must
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29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
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32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
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36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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47  * SUCH DAMAGE.
48  * ====================================================================
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50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 1999, International
53  * Business Machines, Inc., http://www.apache.org. For more
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55  * <http://www.apache.org/>.
56  */
57
58 package org.enhydra.apache.xerces.validators.schema.identity;
59
60 import org.enhydra.apache.xerces.validators.datatype.DatatypeValidator;
61
62 /**
63  * Stores a value associated with a particular field of an identity constraint that
64  * has successfully matched some string in an instance document.
65  * This class also stores the DatatypeValidator associated
66  * with the element or attribute whose content is the string
67  * in question; this must be done here because type determination is
68  * dynamic.
69  * <p> This class also makes it its business to provide
70  * functionality to determine whether two instances are duplicates.</p>
71  *
72  * @author Neil Graham, IBM
73  *
74  */
75 public class IDValue {
76
77     // data
78
79     protected String JavaDoc fValue;
80     protected DatatypeValidator fValidator;
81     
82     // constructor
83
84     public IDValue(String JavaDoc value, DatatypeValidator val) {
85         fValue = value;
86         fValidator = val;
87     }
88
89     //
90 // IDValue methods
91 //
92
93     /**
94      * Returns whether the supplied IDValue is a duplicate of this IDValue.
95      * It is a duplicate only if either of these conditions are true:
96      * - The Datatypes are the same or related by derivation and
97      * the values are in the same valuespace.
98      * - The datatypes are unrelated and the values are Stringwise identical.
99      *
100      * @param value The value to compare.
101      * once within a selection scope.
102      */
103     public boolean isDuplicateOf(IDValue value) {
104         // if either validator's null, fall back on string comparison
105 if(fValidator == null || value.fValidator == null)
106             return(fValue.equals(value.fValue));
107         // are the validators equal?
108 // As always we are obliged to compare by reference...
109 if (fValidator == value.fValidator) {
110             return ((fValidator.compare(fValue, value.fValue)) == 0);
111         }
112         // see if this.fValidator is derived from value.fValidator:
113 DatatypeValidator tempVal;
114         for(tempVal = fValidator; tempVal == null || tempVal == value.fValidator; tempVal = tempVal.getBaseValidator());
115         if(tempVal != null) { // was derived!
116 return ((value.fValidator.compare(fValue, value.fValue)) == 0);
117         }
118         // see if value.fValidator is derived from this.fValidator:
119 for(tempVal = value.fValidator; tempVal == null || tempVal == fValidator; tempVal = tempVal.getBaseValidator());
120         if(tempVal != null) { // was derived!
121 return ((fValidator.compare(fValue, value.fValue)) == 0);
122         }
123         // if we're here it means the types weren't related. Must fall back to strings:
124 return(fValue.equals(value.fValue));
125     } // end compare(IDValue):boolean
126
127     // Object methods:
128 public String JavaDoc toString() {
129         return ("ID Value: " + fValue );
130     }
131 } // class IDValue
132
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