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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > dv > xs > MonthDV


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57
58 package com.sun.org.apache.xerces.internal.impl.dv.xs;
59
60 import com.sun.org.apache.xerces.internal.impl.dv.InvalidDatatypeValueException;
61 import com.sun.org.apache.xerces.internal.impl.dv.ValidationContext;
62
63 /**
64  * Validator for <gMonth> datatype (W3C Schema Datatypes)
65  *
66  * @author Elena Litani
67  * @author Gopal Sharma, SUN Microsystem Inc.
68  *
69  * @version $Id: MonthDV.java,v 1.9 2003/01/16 18:34:04 sandygao Exp $
70  */
71
72 public class MonthDV extends AbstractDateTimeDV {
73
74     /**
75      * Convert a string to a compiled form
76      *
77      * @param content The lexical representation of gMonth
78      * @return a valid and normalized gMonth object
79      */
80     public Object JavaDoc getActualValue(String JavaDoc content, ValidationContext context) throws InvalidDatatypeValueException{
81         try{
82             return new DateTimeData(parse(content), this);
83         } catch(Exception JavaDoc ex){
84             throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object JavaDoc[]{content, "gMonth"});
85         }
86     }
87
88     /**
89      * Parses, validates and computes normalized version of gMonth object
90      *
91      * @param str The lexical representation of gMonth object --MM
92      * with possible time zone Z or (-),(+)hh:mm
93      * @param date uninitialized date object
94      * @return normalized date representation
95      * @exception SchemaDateTimeException Invalid lexical representation
96      */
97     protected int[] parse(String JavaDoc str) throws SchemaDateTimeException{
98         int len = str.length();
99         int[] date=new int[TOTAL_SIZE];
100         int[] timeZone = new int[2];
101
102         //set constants
103 date[CY]=YEAR;
104         date[D]=DAY;
105         if (str.charAt(0)!='-' || str.charAt(1)!='-') {
106             throw new SchemaDateTimeException("Invalid format for gMonth: "+str);
107         }
108         int stop = 4;
109         date[M]=parseInt(str,2,stop);
110
111         // REVISIT: allow both --MM and --MM-- now.
112 // need to remove the following 4 lines to disallow --MM--
113 // when the errata is offically in the rec.
114 if (str.length() >= stop+2 &&
115             str.charAt(stop) == '-' && str.charAt(stop+1) == '-') {
116             stop += 2;
117         }
118         if (stop < len) {
119             int sign = findUTCSign(str, stop, len);
120             if ( sign<0 ) {
121                 throw new SchemaDateTimeException ("Error in month parsing: "+str);
122             }
123             else {
124                 getTimeZone(str, date, sign, len, timeZone);
125             }
126         }
127         //validate and normalize
128 validateDateTime(date, timeZone);
129
130         if ( date[utc]!=0 && date[utc]!='Z' ) {
131             normalize(date, timeZone);
132         }
133         return date;
134     }
135
136     /**
137      * Overwrite compare algorithm to optimize month comparison
138      *
139      * REVISIT: this one is lack of the third parameter: boolean strict, so it
140      * doesn't override the method in the base. But maybe this method
141      * is not correctly implemented, and I did encounter errors when
142      * trying to add the extra parameter. I'm leaving it as is. -SG
143      *
144      * @param date1
145      * @param date2
146      * @return less, greater, equal, indeterminate
147      */
148     protected short compareDates(int[] date1, int[] date2) {
149
150         if ( date1[utc]==date2[utc] ) {
151             return (short)((date1[M]>=date2[M])?(date1[M]>date2[M])?1:0:-1);
152         }
153
154         if ( date1[utc]=='Z' || date2[utc]=='Z' ) {
155
156             if ( date1[M]==date2[M] ) {
157                 //--05--Z and --05--
158 return INDETERMINATE;
159             }
160             if ( (date1[M]+1 == date2[M] || date1[M]-1 == date2[M]) ) {
161                 //--05--Z and (--04-- or --05--)
162 //REVISIT: should this case be less than or equal?
163 // maxExclusive should fail but what about maxInclusive
164 //
165 return INDETERMINATE;
166             }
167         }
168
169         if ( date1[M]<date2[M] ) {
170             return -1;
171         }
172         else {
173             return 1;
174         }
175
176     }
177
178     /**
179      * Converts month object representation to String
180      *
181      * @param date month object
182      * @return lexical representation of month: --MM with an optional time zone sign
183      */
184     protected String JavaDoc dateToString(int[] date) {
185         StringBuffer JavaDoc message = new StringBuffer JavaDoc(5);
186         message.append('-');
187         message.append('-');
188         append(message, date[M], 2);
189         append(message, (char)date[utc], 0);
190         return message.toString();
191     }
192
193 }
194
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