Source Code Cross Referenced for ConverterRegistry.java in  » Workflow-Engines » obe-1.0 » org » obe » convert » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » obe 1.0 » org.obe.convert 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.obe.convert;
002:
003:        import java.math.BigDecimal;
004:        import java.math.BigInteger;
005:        import java.util.Date;
006:        import java.util.HashMap;
007:        import java.util.Map;
008:
009:        /**
010:         * @author Adrian Price
011:         */
012:        public final class ConverterRegistry {
013:            private static final ConverterRegistry _theInstance = new ConverterRegistry();
014:            private Map _converters = new HashMap();
015:            private Map _calculators = new HashMap();
016:
017:            private static class StringConverter extends AbstractCalculator
018:                    implements  Converter {
019:
020:                public Class getTargetClass() {
021:                    return String.class;
022:                }
023:
024:                public Object convert(Object value) {
025:                    return value == null ? null : value.toString();
026:                }
027:
028:                public Object add(Object lhs, Object rhs) {
029:                    StringBuffer sb = new StringBuffer();
030:                    if (lhs != null)
031:                        sb.append(lhs);
032:                    if (rhs != null)
033:                        sb.append(rhs);
034:                    return sb.toString();
035:                }
036:            }
037:
038:            private static abstract class NumberCalculator implements 
039:                    Calculator {
040:                public Object add(Object lhs, Object rhs) {
041:                    return new Integer(((Number) lhs).intValue()
042:                            + ((Number) rhs).intValue());
043:                }
044:
045:                public Object subtract(Object lhs, Object rhs) {
046:                    return new Integer(((Number) lhs).intValue()
047:                            - ((Number) rhs).intValue());
048:                }
049:
050:                public Object multiply(Object lhs, Object rhs) {
051:                    return new Integer(((Number) lhs).intValue()
052:                            * ((Number) rhs).intValue());
053:                }
054:
055:                public Object divide(Object lhs, Object rhs) {
056:                    return new Integer(((Number) lhs).intValue()
057:                            / ((Number) rhs).intValue());
058:                }
059:
060:                public Object negate(Object rhs) {
061:                    return rhs == null ? null : new Integer(-((Number) rhs)
062:                            .intValue());
063:                }
064:
065:                public int compare(Object lhs, Object rhs) {
066:                    return ((Comparable) lhs).compareTo(rhs);
067:                }
068:            }
069:
070:            private static class ByteConverter extends NumberCalculator
071:                    implements  Converter {
072:
073:                public Class getTargetClass() {
074:                    return Byte.class;
075:                }
076:
077:                public Object convert(Object value) {
078:                    if (value == null || value instanceof  Byte)
079:                        return value;
080:                    if (value instanceof  Number)
081:                        return new Byte(((Number) value).byteValue());
082:                    return Byte.valueOf(value.toString());
083:                }
084:            }
085:
086:            private static class ShortConverter extends NumberCalculator
087:                    implements  Converter {
088:
089:                public Class getTargetClass() {
090:                    return Short.class;
091:                }
092:
093:                public Object convert(Object value) {
094:                    if (value == null || value instanceof  Short)
095:                        return value;
096:                    if (value instanceof  Number)
097:                        return new Short(((Number) value).shortValue());
098:                    return Short.valueOf(value.toString());
099:                }
100:            }
101:
102:            private static class IntegerConverter extends NumberCalculator
103:                    implements  Converter {
104:
105:                public Class getTargetClass() {
106:                    return Integer.class;
107:                }
108:
109:                public Object convert(Object value) {
110:                    if (value == null || value instanceof  Integer)
111:                        return value;
112:                    if (value instanceof  Number)
113:                        return new Integer(((Number) value).intValue());
114:                    return Integer.valueOf(value.toString());
115:                }
116:            }
117:
118:            private static class LongConverter implements  Calculator, Converter {
119:                public Class getTargetClass() {
120:                    return Long.class;
121:                }
122:
123:                public Object convert(Object value) {
124:                    if (value == null || value instanceof  Long)
125:                        return value;
126:                    if (value instanceof  Number)
127:                        return new Long(((Number) value).longValue());
128:                    return Long.valueOf(value.toString());
129:                }
130:
131:                public Object add(Object lhs, Object rhs) {
132:                    return new Long(((Number) lhs).longValue()
133:                            + ((Number) rhs).longValue());
134:                }
135:
136:                public Object subtract(Object lhs, Object rhs) {
137:                    return new Long(((Number) lhs).longValue()
138:                            - ((Number) rhs).longValue());
139:                }
140:
141:                public Object multiply(Object lhs, Object rhs) {
142:                    return new Long(((Number) lhs).longValue()
143:                            * ((Number) rhs).longValue());
144:                }
145:
146:                public Object divide(Object lhs, Object rhs) {
147:                    return new Long(((Number) lhs).longValue()
148:                            / ((Number) rhs).longValue());
149:                }
150:
151:                public Object negate(Object rhs) {
152:                    return rhs == null ? null : new Long(-((Number) rhs)
153:                            .longValue());
154:                }
155:
156:                public int compare(Object lhs, Object rhs) {
157:                    return ((Long) lhs).compareTo((Long) rhs);
158:                }
159:            }
160:
161:            private static class FloatConverter implements  Calculator,
162:                    Converter {
163:                public Class getTargetClass() {
164:                    return Float.class;
165:                }
166:
167:                public Object convert(Object value) {
168:                    if (value == null || value instanceof  Float)
169:                        return value;
170:                    if (value instanceof  Number)
171:                        return new Float(((Number) value).floatValue());
172:                    return Float.valueOf(value.toString());
173:                }
174:
175:                public Object add(Object lhs, Object rhs) {
176:                    return new Float(((Number) lhs).floatValue()
177:                            + ((Number) rhs).floatValue());
178:                }
179:
180:                public Object subtract(Object lhs, Object rhs) {
181:                    return new Float(((Number) lhs).floatValue()
182:                            - ((Number) rhs).floatValue());
183:                }
184:
185:                public Object multiply(Object lhs, Object rhs) {
186:                    return new Float(((Number) lhs).floatValue()
187:                            * ((Number) rhs).floatValue());
188:                }
189:
190:                public Object divide(Object lhs, Object rhs) {
191:                    return new Float(((Number) lhs).floatValue()
192:                            / ((Number) rhs).floatValue());
193:                }
194:
195:                public Object negate(Object rhs) {
196:                    return rhs == null ? null : new Float(-((Number) rhs)
197:                            .floatValue());
198:                }
199:
200:                public int compare(Object lhs, Object rhs) {
201:                    return ((Float) lhs).compareTo((Float) rhs);
202:                }
203:            }
204:
205:            private static class DoubleConverter implements  Calculator,
206:                    Converter {
207:                public Class getTargetClass() {
208:                    return Double.class;
209:                }
210:
211:                public Object convert(Object value) {
212:                    if (value == null || value instanceof  Double)
213:                        return value;
214:                    if (value instanceof  Number)
215:                        return new Double(((Number) value).doubleValue());
216:                    return Double.valueOf(value.toString());
217:                }
218:
219:                public Object add(Object lhs, Object rhs) {
220:                    return new Double(((Number) lhs).doubleValue()
221:                            + ((Number) rhs).doubleValue());
222:                }
223:
224:                public Object subtract(Object lhs, Object rhs) {
225:                    return new Double(((Number) lhs).doubleValue()
226:                            - ((Number) rhs).doubleValue());
227:                }
228:
229:                public Object multiply(Object lhs, Object rhs) {
230:                    return new Double(((Number) lhs).doubleValue()
231:                            * ((Number) rhs).doubleValue());
232:                }
233:
234:                public Object divide(Object lhs, Object rhs) {
235:                    return new Double(((Number) lhs).doubleValue()
236:                            / ((Number) rhs).doubleValue());
237:                }
238:
239:                public Object negate(Object rhs) {
240:                    return rhs == null ? null : new Double(-((Number) rhs)
241:                            .doubleValue());
242:                }
243:
244:                public int compare(Object lhs, Object rhs) {
245:                    return ((Float) lhs).compareTo((Float) rhs);
246:                }
247:            }
248:
249:            private static class BigIntegerConverter implements  Calculator,
250:                    Converter {
251:                public Class getTargetClass() {
252:                    return BigInteger.class;
253:                }
254:
255:                public Object convert(Object value) {
256:                    if (value == null || value instanceof  BigInteger)
257:                        return value;
258:                    return new BigInteger(value.toString());
259:                }
260:
261:                public Object add(Object lhs, Object rhs) {
262:                    return ((BigInteger) lhs).add((BigInteger) rhs);
263:                }
264:
265:                public Object subtract(Object lhs, Object rhs) {
266:                    return ((BigInteger) lhs).subtract((BigInteger) rhs);
267:                }
268:
269:                public Object multiply(Object lhs, Object rhs) {
270:                    return ((BigInteger) lhs).multiply((BigInteger) rhs);
271:                }
272:
273:                public Object divide(Object lhs, Object rhs) {
274:                    return ((BigInteger) lhs).divide((BigInteger) rhs);
275:                }
276:
277:                public Object negate(Object rhs) {
278:                    return rhs == null ? null : ((BigInteger) rhs).negate();
279:                }
280:
281:                public int compare(Object lhs, Object rhs) {
282:                    return ((BigInteger) lhs).compareTo((BigInteger) rhs);
283:                }
284:            }
285:
286:            private static class BigDecimalConverter implements  Calculator,
287:                    Converter {
288:                public Class getTargetClass() {
289:                    return BigDecimal.class;
290:                }
291:
292:                public Object convert(Object value) {
293:                    if (value == null || value instanceof  BigDecimal)
294:                        return value;
295:                    return new BigDecimal(value.toString());
296:                }
297:
298:                public Object add(Object lhs, Object rhs) {
299:                    return ((BigDecimal) lhs).add((BigDecimal) rhs);
300:                }
301:
302:                public Object subtract(Object lhs, Object rhs) {
303:                    return ((BigDecimal) lhs).subtract((BigDecimal) rhs);
304:                }
305:
306:                public Object multiply(Object lhs, Object rhs) {
307:                    return ((BigDecimal) lhs).multiply((BigDecimal) rhs);
308:                }
309:
310:                public Object divide(Object lhs, Object rhs) {
311:                    return ((BigDecimal) lhs).divide((BigDecimal) rhs,
312:                            BigDecimal.ROUND_HALF_EVEN);
313:                }
314:
315:                public Object negate(Object rhs) {
316:                    return rhs == null ? null : ((BigDecimal) rhs).negate();
317:                }
318:
319:                public int compare(Object lhs, Object rhs) {
320:                    return ((BigDecimal) lhs).compareTo((BigDecimal) rhs);
321:                }
322:            }
323:
324:            private static class DateConverter implements  Converter {
325:                public Class getTargetClass() {
326:                    return Date.class;
327:                }
328:
329:                public Object convert(Object value) {
330:                    if (value == null || value instanceof  Date)
331:                        return value;
332:                    // TODO: Use DateFormat instead.
333:                    return new Date(value.toString());
334:                }
335:            }
336:
337:            public static ConverterRegistry getInstance() {
338:                return _theInstance;
339:            }
340:
341:            private ConverterRegistry() {
342:                register(new StringConverter());
343:                register(new ByteConverter());
344:                register(new ShortConverter());
345:                register(new IntegerConverter());
346:                register(new LongConverter());
347:                register(new FloatConverter());
348:                register(new DoubleConverter());
349:                register(new BigIntegerConverter());
350:                register(new BigDecimalConverter());
351:                register(new DateConverter());
352:            }
353:
354:            public Object convert(Class targetClass, Object value) {
355:                return findConverter(targetClass).convert(value);
356:            }
357:
358:            public void register(ClassUtility utility) {
359:                Class targetClass = utility.getTargetClass();
360:                if (utility instanceof  Converter)
361:                    _converters.put(targetClass, utility);
362:                if (utility instanceof  Calculator)
363:                    _calculators.put(targetClass, utility);
364:            }
365:
366:            public Calculator findCalculator(Class targetClass) {
367:                Object converter = _calculators.get(targetClass);
368:                if (converter == null) {
369:                    throw new IllegalArgumentException(
370:                            "No calculator registered for " + targetClass);
371:                }
372:                return (Calculator) converter;
373:            }
374:
375:            public Converter findConverter(Class targetClass) {
376:                Object converter = _converters.get(targetClass);
377:                if (converter == null) {
378:                    throw new IllegalArgumentException(
379:                            "No converter registered for " + targetClass);
380:                }
381:                return (Converter) converter;
382:            }
383:        }
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