Source Code Cross Referenced for Closure.java in  » Scripting » groovy-1.0 » groovy » lang » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » groovy.lang 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         $Id: Closure.java 4546 2006-12-21 19:07:22Z blackdrag $
003:
004:         Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:
006:         Redistribution and use of this software and associated documentation
007:         ("Software"), with or without modification, are permitted provided
008:         that the following conditions are met:
009:
010:         1. Redistributions of source code must retain copyright
011:            statements and notices.  Redistributions must also contain a
012:            copy of this document.
013:
014:         2. Redistributions in binary form must reproduce the
015:            above copyright notice, this list of conditions and the
016:            following disclaimer in the documentation and/or other
017:            materials provided with the distribution.
018:
019:         3. The name "groovy" must not be used to endorse or promote
020:            products derived from this Software without prior written
021:            permission of The Codehaus.  For written permission,
022:            please contact info@codehaus.org.
023:
024:         4. Products derived from this Software may not be called "groovy"
025:            nor may "groovy" appear in their names without prior written
026:            permission of The Codehaus. "groovy" is a registered
027:            trademark of The Codehaus.
028:
029:         5. Due credit should be given to The Codehaus -
030:            http://groovy.codehaus.org/
031:
032:         THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033:         ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034:         NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035:         FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036:         THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042:         ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043:         OF THE POSSIBILITY OF SUCH DAMAGE.
044:
045:         */
046:        package groovy.lang;
047:
048:        import org.codehaus.groovy.runtime.CurriedClosure;
049:        import org.codehaus.groovy.runtime.InvokerHelper;
050:        import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
051:
052:        import java.io.IOException;
053:        import java.io.StringWriter;
054:        import java.io.Writer;
055:        import java.lang.reflect.Method;
056:        import java.security.AccessController;
057:        import java.security.PrivilegedAction;
058:
059:        /**
060:         * Represents any closure object in Groovy.
061:         *
062:         * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
063:         * @author <a href="mailto:tug@wilson.co.uk">John Wilson</a>
064:         * @version $Revision: 4546 $
065:         */
066:        public abstract class Closure extends GroovyObjectSupport implements 
067:                Cloneable, Runnable {
068:
069:            private static final Object noParameters[] = new Object[] { null };
070:            private static final Object emptyArray[] = new Object[0];
071:            private static final Object emptyArrayParameter[] = new Object[] { emptyArray };
072:
073:            private Object delegate;
074:            private final Object owner;
075:            private Class[] parameterTypes;
076:            protected int maximumNumberOfParameters;
077:            private final Object this Object;
078:
079:            private int directive = 0;
080:            public final static int DONE = 1, SKIP = 2;
081:
082:            public Closure(Object owner, Object this Object) {
083:                this .owner = owner;
084:                this .delegate = owner;
085:                this .this Object = this Object;
086:
087:                Class closureClass = this .getClass();
088:                final Class clazz = closureClass;
089:                final Method[] methods = (Method[]) AccessController
090:                        .doPrivileged(new PrivilegedAction() {
091:                            public Object run() {
092:                                return clazz.getDeclaredMethods();
093:                            }
094:                        });
095:
096:                // set it to -1 for starters so parameterTypes will always get a type
097:                maximumNumberOfParameters = -1;
098:                for (int j = 0; j < methods.length; j++) {
099:                    if ("doCall".equals(methods[j].getName())
100:                            && methods[j].getParameterTypes().length > maximumNumberOfParameters) {
101:                        parameterTypes = methods[j].getParameterTypes();
102:                        maximumNumberOfParameters = parameterTypes.length;
103:                    }
104:                }
105:                // this line should be useless, but well, just in case
106:                maximumNumberOfParameters = Math.max(maximumNumberOfParameters,
107:                        0);
108:            }
109:
110:            public Closure(Object owner) {
111:                this (owner, null);
112:            }
113:
114:            protected Object getThisObject() {
115:                return this Object;
116:            }
117:
118:            public Object getProperty(String property) {
119:                if ("delegate".equals(property)) {
120:                    return getDelegate();
121:                } else if ("owner".equals(property)) {
122:                    return getOwner();
123:                } else if ("getMaximumNumberOfParameters".equals(property)) {
124:                    return new Integer(getMaximumNumberOfParameters());
125:                } else if ("parameterTypes".equals(property)) {
126:                    return getParameterTypes();
127:                } else if ("metaClass".equals(property)) {
128:                    return getMetaClass();
129:                } else if ("class".equals(property)) {
130:                    return getClass();
131:                } else {
132:                    try {
133:                        // lets try getting the property on the owner
134:                        return InvokerHelper.getProperty(this .owner, property);
135:                    } catch (MissingPropertyException e1) {
136:                        if (this .delegate != null && this .delegate != this 
137:                                && this .delegate != this .owner) {
138:                            try {
139:                                // lets try getting the property on the delegate
140:                                return InvokerHelper.getProperty(this .delegate,
141:                                        property);
142:                            } catch (GroovyRuntimeException e2) {
143:                                // ignore, we'll throw e1
144:                            }
145:                        }
146:
147:                        throw e1;
148:                    }
149:                }
150:            }
151:
152:            public void setProperty(String property, Object newValue) {
153:                if ("delegate".equals(property)) {
154:                    setDelegate(newValue);
155:                } else if ("metaClass".equals(property)) {
156:                    setMetaClass((MetaClass) newValue);
157:                } else {
158:                    try {
159:                        // lets try setting the property on the owner
160:                        InvokerHelper.setProperty(this .owner, property,
161:                                newValue);
162:                        return;
163:                    } catch (GroovyRuntimeException e1) {
164:                        if (this .delegate != null && this .delegate != this 
165:                                && this .delegate != this .owner) {
166:                            try {
167:                                // lets try setting the property on the delegate
168:                                InvokerHelper.setProperty(this .delegate,
169:                                        property, newValue);
170:                                return;
171:                            } catch (GroovyRuntimeException e2) {
172:                                // ignore, we'll throw e1
173:                            }
174:                        }
175:
176:                        throw e1;
177:                    }
178:                }
179:            }
180:
181:            public boolean isCase(Object candidate) {
182:                return DefaultTypeTransformation.castToBoolean(call(candidate));
183:            }
184:
185:            /**
186:             * Invokes the closure without any parameters, returning any value if applicable.
187:             *
188:             * @return the value if applicable or null if there is no return statement in the closure
189:             */
190:            public Object call() {
191:                return call(new Object[] {});
192:            }
193:
194:            public Object call(Object[] args) {
195:                try {
196:                    return getMetaClass().invokeMethod(this , "doCall", args);
197:                } catch (Exception e) {
198:                    return throwRuntimeException(e);
199:                }
200:            }
201:
202:            /**
203:             * Invokes the closure, returning any value if applicable.
204:             *
205:             * @param arguments could be a single value or a List of values
206:             * @return the value if applicable or null if there is no return statement in the closure
207:             */
208:            public Object call(final Object arguments) {
209:                return call(new Object[] { arguments });
210:            }
211:
212:            protected static Object throwRuntimeException(Throwable throwable) {
213:                if (throwable instanceof  RuntimeException) {
214:                    throw (RuntimeException) throwable;
215:                } else {
216:                    throw new GroovyRuntimeException(throwable.getMessage(),
217:                            throwable);
218:                }
219:            }
220:
221:            /**
222:             * @return the owner Object to which method calls will go which is
223:             *         typically the outer class when the closure is constructed
224:             */
225:            public Object getOwner() {
226:                return this .owner;
227:            }
228:
229:            /**
230:             * @return the delegate Object to which method calls will go which is
231:             *         typically the outer class when the closure is constructed
232:             */
233:            public Object getDelegate() {
234:                return this .delegate;
235:            }
236:
237:            /**
238:             * Allows the delegate to be changed such as when performing markup building
239:             *
240:             * @param delegate
241:             */
242:            public void setDelegate(Object delegate) {
243:                this .delegate = delegate;
244:            }
245:
246:            /**
247:             * @return the parameter types of the longest doCall method
248:             * of this closure
249:             */
250:            public Class[] getParameterTypes() {
251:                return this .parameterTypes;
252:            }
253:
254:            /**
255:             * @return the maximum number of parameters a doCall methos
256:             * of this closure can take
257:             */
258:            public int getMaximumNumberOfParameters() {
259:                return this .maximumNumberOfParameters;
260:            }
261:
262:            /**
263:             * @return a version of this closure which implements Writable
264:             */
265:            public Closure asWritable() {
266:                return new WritableClosure();
267:            }
268:
269:            /* (non-Javadoc)
270:             * @see java.lang.Runnable#run()
271:             */
272:            public void run() {
273:                call();
274:            }
275:
276:            /**
277:             * Support for closure currying
278:             *
279:             * @param arguments
280:             */
281:            public Closure curry(final Object arguments[]) {
282:                return new CurriedClosure(this , arguments);
283:            }
284:
285:            /* (non-Javadoc)
286:             * @see java.lang.Object#clone()
287:             */
288:            public Object clone() {
289:                try {
290:                    return super .clone();
291:                } catch (final CloneNotSupportedException e) {
292:                    return null;
293:                }
294:            }
295:
296:            /**
297:             * Implementation note: 
298:             *   This has to be an inner class!
299:             * 
300:             * Reason: 
301:             *   Closure.this.call will call the outer call method, bur
302:             * with the inner class as executing object. This means any
303:             * invokeMethod or getProperty call will be called on this 
304:             * inner class instead of the outer!
305:             */
306:            private class WritableClosure extends Closure implements  Writable {
307:                public WritableClosure() {
308:                    super (Closure.this );
309:                }
310:
311:                /* (non-Javadoc)
312:                 * @see groovy.lang.Writable#writeTo(java.io.Writer)
313:                 */
314:                public Writer writeTo(Writer out) throws IOException {
315:                    Closure.this .call(new Object[] { out });
316:
317:                    return out;
318:                }
319:
320:                /* (non-Javadoc)
321:                 * @see groovy.lang.GroovyObject#invokeMethod(java.lang.String, java.lang.Object)
322:                 */
323:                public Object invokeMethod(String method, Object arguments) {
324:                    if ("clone".equals(method)) {
325:                        return clone();
326:                    } else if ("curry".equals(method)) {
327:                        return curry((Object[]) arguments);
328:                    } else if ("asWritable".equals(method)) {
329:                        return asWritable();
330:                    } else {
331:                        return Closure.this .invokeMethod(method, arguments);
332:                    }
333:                }
334:
335:                /* (non-Javadoc)
336:                 * @see groovy.lang.GroovyObject#getProperty(java.lang.String)
337:                 */
338:                public Object getProperty(String property) {
339:                    return Closure.this .getProperty(property);
340:                }
341:
342:                /* (non-Javadoc)
343:                 * @see groovy.lang.GroovyObject#setProperty(java.lang.String, java.lang.Object)
344:                 */
345:                public void setProperty(String property, Object newValue) {
346:                    Closure.this .setProperty(property, newValue);
347:                }
348:
349:                /* (non-Javadoc)
350:                 * @see groovy.lang.Closure#call()
351:                 */
352:                public Object call() {
353:                    return Closure.this .call();
354:                }
355:
356:                /* (non-Javadoc)
357:                 * @see groovy.lang.Closure#call(java.lang.Object)
358:                 */
359:                public Object call(Object arguments) {
360:                    return Closure.this .call(arguments);
361:                }
362:
363:                /* (non-Javadoc)
364:                 * @see groovy.lang.Closure#getDelegate()
365:                 */
366:                public Object getDelegate() {
367:                    return Closure.this .getDelegate();
368:                }
369:
370:                /* (non-Javadoc)
371:                 * @see groovy.lang.Closure#setDelegate(java.lang.Object)
372:                 */
373:                public void setDelegate(Object delegate) {
374:                    Closure.this .setDelegate(delegate);
375:                }
376:
377:                /* (non-Javadoc)
378:                 * @see groovy.lang.Closure#getParameterTypes()
379:                 */
380:                public Class[] getParameterTypes() {
381:                    return Closure.this .getParameterTypes();
382:                }
383:
384:                /* (non-Javadoc)
385:                 * @see groovy.lang.Closure#getParameterTypes()
386:                 */
387:                public int getMaximumNumberOfParameters() {
388:                    return Closure.this .getMaximumNumberOfParameters();
389:                }
390:
391:                /* (non-Javadoc)
392:                 * @see groovy.lang.Closure#asWritable()
393:                 */
394:                public Closure asWritable() {
395:                    return this ;
396:                }
397:
398:                /* (non-Javadoc)
399:                 * @see java.lang.Runnable#run()
400:                 */
401:                public void run() {
402:                    Closure.this .run();
403:                }
404:
405:                /* (non-Javadoc)
406:                 * @see java.lang.Object#clone()
407:                 */
408:                public Object clone() {
409:                    return ((Closure) Closure.this .clone()).asWritable();
410:                }
411:
412:                /* (non-Javadoc)
413:                 * @see java.lang.Object#hashCode()
414:                 */
415:                public int hashCode() {
416:                    return Closure.this .hashCode();
417:                }
418:
419:                /* (non-Javadoc)
420:                 * @see java.lang.Object#equals(java.lang.Object)
421:                 */
422:                public boolean equals(Object arg0) {
423:                    return Closure.this .equals(arg0);
424:                }
425:
426:                /* (non-Javadoc)
427:                 * @see java.lang.Object#toString()
428:                 */
429:                public String toString() {
430:                    final StringWriter writer = new StringWriter();
431:
432:                    try {
433:                        writeTo(writer);
434:                    } catch (IOException e) {
435:                        return null;
436:                    }
437:
438:                    return writer.toString();
439:                }
440:
441:                public Closure curry(final Object arguments[]) {
442:                    return (new CurriedClosure(this , arguments)).asWritable();
443:                }
444:            }
445:
446:            /**
447:             * @return Returns the directive.
448:             */
449:            public int getDirective() {
450:                return directive;
451:            }
452:
453:            /**
454:             * @param directive The directive to set.
455:             */
456:            public void setDirective(int directive) {
457:                this.directive = directive;
458:            }
459:
460:        }
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