001: /*
002: * The Apache Software License, Version 1.1
003: *
004: *
005: * Copyright (c) 2001 The Apache Software Foundation.
006: * All rights reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: *
012: * 1. Redistributions of source code must retain the above copyright
013: * notice, this list of conditions and the following disclaimer.
014: *
015: * 2. Redistributions in binary form must reproduce the above copyright
016: * notice, this list of conditions and the following disclaimer in
017: * the documentation and/or other materials provided with the
018: * distribution.
019: *
020: * 3. The end-user documentation included with the redistribution,
021: * if any, must include the following acknowledgment:
022: * "This product includes software developed by the
023: * Apache Software Foundation (http://www.apache.org/)."
024: * Alternately, this acknowledgment may appear in the software itself,
025: * if and wherever such third-party acknowledgments normally appear.
026: *
027: * 4. The names "Xerces" and "Apache Software Foundation" must
028: * not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact apache@apache.org.
031: *
032: * 5. Products derived from this software may not be called "Apache",
033: * nor may "Apache" appear in their name, without prior written
034: * permission of the Apache Software Foundation.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: * ====================================================================
049: *
050: * This software consists of voluntary contributions made by many
051: * individuals on behalf of the Apache Software Foundation and was
052: * originally based on software copyright (c) 1999, International
053: * Business Machines, Inc., http://www.apache.org. For more
054: * information on the Apache Software Foundation, please see
055: * <http://www.apache.org/>.
056: */
057:
058: package org.apache.xerces.validators.schema.identity;
059:
060: import org.apache.xerces.validators.datatype.DatatypeValidator;
061:
062: /**
063: * Stores a value associated with a particular field of an identity constraint that
064: * has successfully matched some string in an instance document.
065: * This class also stores the DatatypeValidator associated
066: * with the element or attribute whose content is the string
067: * in question; this must be done here because type determination is
068: * dynamic.
069: * <p> This class also makes it its business to provide
070: * functionality to determine whether two instances are duplicates.</p>
071: *
072: * @author Neil Graham, IBM
073: *
074: */
075: public class IDValue {
076:
077: // data
078:
079: protected String fValue;
080: protected DatatypeValidator fValidator;
081:
082: // constructor
083:
084: public IDValue(String value, DatatypeValidator val) {
085: fValue = value;
086: fValidator = val;
087: }
088:
089: //
090: // IDValue methods
091: //
092:
093: /**
094: * Returns whether the supplied IDValue is a duplicate of this IDValue.
095: * It is a duplicate only if either of these conditions are true:
096: * - The Datatypes are the same or related by derivation and
097: * the values are in the same valuespace.
098: * - The datatypes are unrelated and the values are Stringwise identical.
099: *
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
115: || tempVal == value.fValidator; tempVal = tempVal
116: .getBaseValidator())
117: ;
118: if (tempVal != null) { // was derived!
119: return ((value.fValidator.compare(fValue, value.fValue)) == 0);
120: }
121: // see if value.fValidator is derived from this.fValidator:
122: for (tempVal = value.fValidator; tempVal == null
123: || tempVal == fValidator; tempVal = tempVal
124: .getBaseValidator())
125: ;
126: if (tempVal != null) { // was derived!
127: return ((fValidator.compare(fValue, value.fValue)) == 0);
128: }
129: // if we're here it means the types weren't related. Must fall back to strings:
130: return (fValue.equals(value.fValue));
131: } // end compare(IDValue):boolean
132:
133: // Object methods:
134: public String toString() {
135: return ("ID Value: " + fValue);
136: }
137: } // class IDValue
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