KickJava   Java API By Example, From Geeks To Geeks.

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


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 2001, 2002 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
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
31  *
32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  * ====================================================================
49  *
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
54  * information on the Apache Software Foundation, please see
55  * <http://www.apache.org/>.
56  */
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
Popular Tags