Source Code Cross Referenced for MonthDurationValue.java in  » XML » saxonb » net » sf » saxon » value » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.value 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.value;
002:
003:        import net.sf.saxon.expr.XPathContext;
004:        import net.sf.saxon.om.FastStringBuffer;
005:        import net.sf.saxon.trans.DynamicError;
006:        import net.sf.saxon.trans.XPathException;
007:        import net.sf.saxon.type.ItemType;
008:        import net.sf.saxon.type.Type;
009:        import net.sf.saxon.type.TypeHierarchy;
010:
011:        import java.util.StringTokenizer;
012:        import java.math.BigDecimal;
013:
014:        /**
015:         * A value of type xsd:yearMonthDuration
016:         */
017:
018:        public final class MonthDurationValue extends DurationValue implements 
019:                Comparable {
020:
021:            /**
022:             * Private constructor for internal use
023:             */
024:
025:            private MonthDurationValue() {
026:            }
027:
028:            /**
029:             * Constructor: create a duration value from a supplied string, in
030:             * ISO 8601 format [+|-]PnYnM
031:             */
032:
033:            public MonthDurationValue(CharSequence s) throws XPathException {
034:
035:                StringTokenizer tok = new StringTokenizer(trimWhitespace(s)
036:                        .toString(), "-+PYM", true);
037:                try {
038:                    if (!tok.hasMoreElements())
039:                        badDuration("empty string", s);
040:                    String part = (String) tok.nextElement();
041:                    if ("+".equals(part)) {
042:                        part = (String) tok.nextElement();
043:                    } else if ("-".equals(part)) {
044:                        negative = true;
045:                        part = (String) tok.nextElement();
046:                    }
047:                    if (!"P".equals(part))
048:                        badDuration("missing 'P'", s);
049:                    int state = 0;
050:                    while (tok.hasMoreElements()) {
051:                        part = (String) tok.nextElement();
052:                        if ("T".equals(part)) {
053:                            state = 4;
054:                            part = (String) tok.nextElement();
055:                        }
056:                        int value = Integer.parseInt(part);
057:                        if (!tok.hasMoreElements())
058:                            badDuration("missing unit letter at end", s);
059:                        char delim = ((String) tok.nextElement()).charAt(0);
060:                        switch (delim) {
061:                        case 'Y':
062:                            if (state > 0)
063:                                badDuration("Y is out of sequence", s);
064:                            years = value;
065:                            state = 1;
066:                            break;
067:                        case 'M':
068:                            if (state == 4 || state == 5) {
069:                                minutes = value;
070:                                state = 6;
071:                                break;
072:                            } else if (state == 0 || state == 1) {
073:                                months = value;
074:                                state = 2;
075:                                break;
076:                            } else {
077:                                badDuration("M is out of sequence", s);
078:                            }
079:
080:                        default:
081:                            badDuration("misplaced " + delim, s);
082:                        }
083:                    }
084:                    normalize();
085:
086:                } catch (NumberFormatException err) {
087:                    badDuration("non-numeric component", s);
088:                }
089:            }
090:
091:            /**
092:             * Convert to string
093:             * @return ISO 8601 representation.
094:             */
095:
096:            public CharSequence getStringValueCS() {
097:
098:                // The canonical representation has months in the range 0-11
099:
100:                int mm = years * 12 + months;
101:                int y = mm / 12;
102:                int m = mm % 12;
103:
104:                FastStringBuffer sb = new FastStringBuffer(32);
105:                if (negative) {
106:                    sb.append('-');
107:                }
108:                sb.append('P');
109:                if (y != 0) {
110:                    sb.append(y + "Y");
111:                }
112:                if (m != 0 || y == 0) {
113:                    sb.append(m + "M");
114:                }
115:                return sb;
116:
117:            }
118:
119:            /**
120:             * Normalize the value, for example 90M becomes 1H30M
121:             */
122:
123:            public void normalize() {
124:                if (months >= 12) {
125:                    years += (months / 12);
126:                    months = months % 12;
127:                }
128:            }
129:
130:            /**
131:             * Get the number of months in the duration
132:             */
133:
134:            public int getLengthInMonths() {
135:                return (years * 12 + months) * (negative ? -1 : +1);
136:            }
137:
138:            /**
139:             * Construct a duration value as a number of months.
140:             */
141:
142:            public static MonthDurationValue fromMonths(int months) {
143:                MonthDurationValue mdv = new MonthDurationValue();
144:                mdv.negative = (months < 0);
145:                mdv.months = (months < 0 ? -months : months);
146:                mdv.normalize();
147:                return mdv;
148:            }
149:
150:            /**
151:             * Multiply duration by a number
152:             */
153:
154:            public DurationValue multiply(double n, XPathContext context)
155:                    throws XPathException {
156:                if (Double.isNaN(n)) {
157:                    DynamicError err = new DynamicError(
158:                            "Cannot multiply/divide a duration by NaN");
159:                    err.setErrorCode("FOCA0005");
160:                    err.setXPathContext(context);
161:                    throw err;
162:                }
163:                double m = (double) getLengthInMonths();
164:                double product = n * m;
165:                if (Double.isInfinite(product) || product > Integer.MAX_VALUE
166:                        || product < Integer.MIN_VALUE) {
167:                    DynamicError err = new DynamicError(
168:                            "Overflow when multiplying/dividing a duration by a number");
169:                    err.setErrorCode("FODT0002");
170:                    err.setXPathContext(context);
171:                    throw err;
172:                }
173:                return fromMonths((int) Math.round(product));
174:            }
175:
176:            /**
177:             * Find the ratio between two durations
178:             * @param other the dividend
179:             * @return the ratio, as a decimal
180:             * @throws XPathException
181:             */
182:
183:            public DecimalValue divide(DurationValue other, XPathContext context)
184:                    throws XPathException {
185:                if (other instanceof  MonthDurationValue) {
186:                    BigDecimal v1 = new BigDecimal(this .getLengthInMonths());
187:                    BigDecimal v2 = new BigDecimal(((MonthDurationValue) other)
188:                            .getLengthInMonths());
189:                    return new DecimalValue(v1.divide(v2, 20,
190:                            BigDecimal.ROUND_HALF_EVEN));
191:                } else {
192:                    throw new DynamicError(
193:                            "Cannot divide two durations of different type");
194:                }
195:            }
196:
197:            /**
198:             * Add two year-month-durations
199:             */
200:
201:            public DurationValue add(DurationValue other, XPathContext context)
202:                    throws XPathException {
203:                if (other instanceof  MonthDurationValue) {
204:                    return fromMonths(this .getLengthInMonths()
205:                            + ((MonthDurationValue) other).getLengthInMonths());
206:                } else {
207:                    throw new DynamicError(
208:                            "Cannot add two durations of different type");
209:                }
210:            }
211:
212:            /**
213:             * Subtract two year-month-durations
214:             */
215:
216:            public DurationValue subtract(DurationValue other,
217:                    XPathContext context) throws XPathException {
218:                if (other instanceof  MonthDurationValue) {
219:                    return fromMonths(this .getLengthInMonths()
220:                            - ((MonthDurationValue) other).getLengthInMonths());
221:                } else {
222:                    throw new DynamicError(
223:                            "Cannot subtract two durations of different type");
224:                }
225:            }
226:
227:            /**
228:             * Determine the data type of the exprssion
229:             * @return Type.YEAR_MONTH_DURATION,
230:             * @param th
231:             */
232:
233:            public ItemType getItemType(TypeHierarchy th) {
234:                return Type.YEAR_MONTH_DURATION_TYPE;
235:            }
236:
237:            /**
238:             * Convert to Java object (for passing to external functions)
239:             */
240:
241:            public Object convertToJava(Class target, XPathContext context)
242:                    throws XPathException {
243:                if (target.isAssignableFrom(DurationValue.class)) {
244:                    return this ;
245:                } else if (target == String.class
246:                        || target == CharSequence.class) {
247:                    return getStringValue();
248:                } else if (target == Object.class) {
249:                    return getStringValue();
250:                } else {
251:                    throw new DynamicError(
252:                            "Conversion of yearMonthDuration to "
253:                                    + target.getName() + " is not supported");
254:                }
255:            }
256:
257:            /**
258:             * Compare the value to another duration value
259:             * @param other The other dateTime value
260:             * @return negative value if this one is the earler, 0 if they are chronologically equal,
261:             * positive value if this one is the later. For this purpose, dateTime values with an unknown
262:             * timezone are considered to be UTC values (the Comparable interface requires
263:             * a total ordering).
264:             * @throws ClassCastException if the other value is not a DateTimeValue (the parameter
265:             * is declared as Object to satisfy the Comparable interface)
266:             */
267:
268:            public int compareTo(Object other) {
269:                if (other instanceof  MonthDurationValue) {
270:                    return this .getLengthInMonths()
271:                            - ((MonthDurationValue) other).getLengthInMonths();
272:                } else {
273:                    throw new ClassCastException(
274:                            "Cannot compare a yearMonthDuration to an object of class "
275:                                    + other.getClass());
276:                }
277:            }
278:
279:        }
280:
281:        //
282:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
283:        // you may not use this file except in compliance with the License. You may obtain a copy of the
284:        // License at http://www.mozilla.org/MPL/
285:        //
286:        // Software distributed under the License is distributed on an "AS IS" basis,
287:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
288:        // See the License for the specific language governing rights and limitations under the License.
289:        //
290:        // The Original Code is: all this file.
291:        //
292:        // The Initial Developer of the Original Code is Michael H. Kay
293:        //
294:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
295:        //
296:        // Contributor(s): none.
297:        //
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