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Java > Open Source Codes > org > enhydra > apache > xerces > validators > datatype > MonthDatatypeValidator


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57
58 package org.enhydra.apache.xerces.validators.datatype;
59
60 import java.util.Hashtable JavaDoc;
61
62 /**
63  * Validator for <gMonth> datatype (W3C Schema Datatypes)
64  *
65  * @author Elena Litani
66  * @version $Id: MonthDatatypeValidator.java,v 1.1.1.1 2003/03/10 16:34:47 taweili Exp $
67  */
68
69 public class MonthDatatypeValidator extends DateTimeValidator {
70
71     public MonthDatatypeValidator() throws InvalidDatatypeFacetException{
72         super();
73     }
74
75     public MonthDatatypeValidator ( DatatypeValidator base, Hashtable JavaDoc facets,
76                                      boolean derivedByList ) throws InvalidDatatypeFacetException {
77         super(base, facets, derivedByList);
78     }
79
80     /**
81      * Parses, validates and computes normalized version of gMonth object
82      *
83      * @param str The lexical representation of gMonth object --MM--
84      * with possible time zone Z or (-),(+)hh:mm
85      * @param date uninitialized date object
86      * @return normalized date representation
87      * @exception Exception Invalid lexical representation
88      */
89     protected int[] parse(String JavaDoc str, int[] date) throws SchemaDateTimeException{
90
91         resetBuffer(str);
92
93         //create structure to hold an object
94 if ( date== null ) {
95             date=new int[TOTAL_SIZE];
96         }
97         resetDateObj(date);
98
99         //set constants
100 date[CY]=YEAR;
101         date[D]=DAY;
102         if (fBuffer.charAt(0)!='-' || fBuffer.charAt(1)!='-') {
103             throw new SchemaDateTimeException("Invalid format for gMonth: "+str);
104         }
105         int stop = fStart +4;
106         date[M]=parseInt(fStart+2,stop);
107
108         if (fBuffer.charAt(stop++)!='-' || fBuffer.charAt(stop)!='-') {
109             throw new SchemaDateTimeException("Invalid format for gMonth: "+str);
110         }
111         if ( MONTH_SIZE<fEnd ) {
112             int sign = findUTCSign(MONTH_SIZE, fEnd);
113             if ( sign<0 ) {
114                 throw new SchemaDateTimeException ("Error in month parsing: "+str);
115             }
116             else {
117                 getTimeZone(date, sign);
118             }
119         }
120         //validate and normalize
121
122         //REVISIT: do we need SchemaDateTimeException?
123 validateDateTime(date);
124         
125         if ( date[utc]!=0 && date[utc]!='Z' ) {
126             normalize(date);
127         }
128         return date;
129     }
130
131     /**
132      * Overwrite compare algorithm to optimize month comparison
133      *
134      * @param date1
135      * @param date2
136      * @return
137      */
138     protected short compareDates(int[] date1, int[] date2) {
139
140         if ( date1[utc]==date2[utc] ) {
141             return (date1[M]>=date2[M])?(date1[M]>date2[M])?LESS_THAN:EQUAL:GREATER_THAN;
142         }
143
144         if ( date1[utc]=='Z' || date2[utc]=='Z' ) {
145             
146             if ( date1[M]==date2[M] ) {
147                 //--05--Z and --05--
148 return INDETERMINATE;
149             }
150             if ( (date1[M]+1 == date2[M] || date1[M]-1 == date2[M]) ) {
151                 //--05--Z and (--04-- or --05--)
152 //REVISIT: should this case be less than or equal?
153 // maxExclusive should fail but what about maxInclusive
154 //
155 return INDETERMINATE;
156             }
157         }
158
159         if ( date1[M]<date2[M] ) {
160             return LESS_THAN;
161         }
162         else {
163             return GREATER_THAN;
164         }
165
166     }
167
168     /**
169      * Converts month object representation to String
170      *
171      * @param date month object
172      * @return lexical representation of month: --MM-- with an optional time zone sign
173      */
174     protected String JavaDoc dateToString(int[] date) {
175
176         message.setLength(0);
177         message.append('-');
178         message.append('-');
179         message.append(date[M]);
180         message.append('-');
181         message.append('-');
182         message.append((char)date[utc]);
183         return message.toString();
184     }
185
186 }
187
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