Source Code Cross Referenced for PropertyConduitSourceImpl.java in  » Library » Tapestry » org » apache » tapestry » internal » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.internal.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.internal.services;
016:
017:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newConcurrentMap;
018:        import static org.apache.tapestry.ioc.internal.util.Defense.notBlank;
019:        import static org.apache.tapestry.ioc.internal.util.Defense.notNull;
020:
021:        import java.lang.annotation.Annotation;
022:        import java.lang.reflect.Method;
023:        import java.lang.reflect.Modifier;
024:        import java.util.Map;
025:
026:        import org.apache.tapestry.PropertyConduit;
027:        import org.apache.tapestry.internal.events.InvalidationListener;
028:        import org.apache.tapestry.internal.util.MultiKey;
029:        import org.apache.tapestry.ioc.AnnotationProvider;
030:        import org.apache.tapestry.ioc.services.ClassFab;
031:        import org.apache.tapestry.ioc.services.ClassFabUtils;
032:        import org.apache.tapestry.ioc.services.ClassFactory;
033:        import org.apache.tapestry.ioc.services.MethodSignature;
034:        import org.apache.tapestry.ioc.services.PropertyAccess;
035:        import org.apache.tapestry.ioc.services.PropertyAdapter;
036:        import org.apache.tapestry.ioc.util.BodyBuilder;
037:        import org.apache.tapestry.services.PropertyConduitSource;
038:
039:        public class PropertyConduitSourceImpl implements 
040:                PropertyConduitSource, InvalidationListener {
041:            private static final String PARENS = "()";
042:
043:            private final PropertyAccess _access;
044:
045:            private final ClassFactory _classFactory;
046:
047:            private final Map<Class, Class> _classToEffectiveClass = newConcurrentMap();
048:
049:            /** Keyed on combination of root class and expression. */
050:            private final Map<MultiKey, PropertyConduit> _cache = newConcurrentMap();
051:
052:            private static final MethodSignature GET_SIGNATURE = new MethodSignature(
053:                    Object.class, "get", new Class[] { Object.class }, null);
054:
055:            private static final MethodSignature SET_SIGNATURE = new MethodSignature(
056:                    void.class, "set",
057:                    new Class[] { Object.class, Object.class }, null);
058:
059:            public PropertyConduitSourceImpl(final PropertyAccess access,
060:                    final ClassFactory classFactory) {
061:                _access = access;
062:                _classFactory = classFactory;
063:            }
064:
065:            public PropertyConduit create(Class rootClass, String expression) {
066:                notNull(rootClass, "rootClass");
067:                notBlank(expression, "expression");
068:
069:                Class effectiveClass = toEffectiveClass(rootClass);
070:
071:                MultiKey key = new MultiKey(effectiveClass, expression);
072:
073:                PropertyConduit result = _cache.get(key);
074:
075:                if (result == null) {
076:                    result = build(effectiveClass, expression);
077:                    _cache.put(key, result);
078:
079:                }
080:
081:                return result;
082:            }
083:
084:            private Class toEffectiveClass(Class rootClass) {
085:                Class result = _classToEffectiveClass.get(rootClass);
086:
087:                if (result == null) {
088:                    result = _classFactory.importClass(rootClass);
089:
090:                    _classToEffectiveClass.put(rootClass, result);
091:                }
092:
093:                return result;
094:            }
095:
096:            /**
097:             * Clears its cache when the component class loader is invalidated; this is because it will be
098:             * common to generated conduits rooted in a component class (which will no longer be valid and
099:             * must be released to the garbage collector).
100:             */
101:            public void objectWasInvalidated() {
102:                _cache.clear();
103:                _classToEffectiveClass.clear();
104:            }
105:
106:            /**
107:             * Builds a subclass of {@link BasePropertyConduit} that implements the get() and set() methods
108:             * and overrides the constructor. In a worst-case race condition, we may build two (or more)
109:             * conduits for the same rootClass/expression, and it will get sorted out when the conduit is
110:             * stored into the cache.
111:             * 
112:             * @param rootClass
113:             * @param expression
114:             * @return the conduit
115:             */
116:            private PropertyConduit build(Class rootClass, String expression) {
117:                String name = ClassFabUtils
118:                        .generateClassName("PropertyConduit");
119:
120:                ClassFab classFab = _classFactory.newClass(name,
121:                        BasePropertyConduit.class);
122:
123:                classFab.addConstructor(new Class[] { Class.class,
124:                        AnnotationProvider.class, String.class }, null,
125:                        "super($$);");
126:
127:                String[] terms = expression.split("\\.");
128:
129:                final Method readMethod = buildGetter(rootClass, classFab,
130:                        expression, terms);
131:                final Method writeMethod = buildSetter(rootClass, classFab,
132:                        expression, terms);
133:
134:                // A conduit is either readable or writeable, otherwise there will already have been
135:                // an error about unknown method name or property name.
136:
137:                Class propertyType = readMethod != null ? readMethod
138:                        .getReturnType() : writeMethod.getParameterTypes()[0];
139:
140:                String description = String.format("PropertyConduit[%s %s]",
141:                        rootClass.getName(), expression);
142:
143:                Class conduitClass = classFab.createClass();
144:
145:                AnnotationProvider provider = new AnnotationProvider() {
146:
147:                    public <T extends Annotation> T getAnnotation(
148:                            Class<T> annotationClass) {
149:                        T result = readMethod == null ? null : readMethod
150:                                .getAnnotation(annotationClass);
151:
152:                        if (result == null && writeMethod != null)
153:                            result = writeMethod.getAnnotation(annotationClass);
154:
155:                        return result;
156:                    }
157:
158:                };
159:
160:                try {
161:                    return (PropertyConduit) conduitClass.getConstructors()[0]
162:                            .newInstance(propertyType, provider, description);
163:                } catch (Exception ex) {
164:                    throw new RuntimeException(ex);
165:                }
166:
167:            }
168:
169:            private Method buildGetter(Class rootClass, ClassFab classFab,
170:                    String expression, String[] terms) {
171:                BodyBuilder builder = new BodyBuilder();
172:                builder.begin();
173:
174:                builder.addln("%s root = (%<s) $1;", ClassFabUtils
175:                        .toJavaClassName(rootClass));
176:                String previousStep = "root";
177:
178:                Class activeType = rootClass;
179:                Method result = null;
180:                boolean writeOnly = false;
181:
182:                for (int i = 0; i < terms.length; i++) {
183:                    String this Step = "step" + (i + 1);
184:                    String term = terms[i];
185:
186:                    boolean nullable = term.endsWith("?");
187:                    if (nullable)
188:                        term = term.substring(0, term.length() - 1);
189:
190:                    Method readMethod = readMethodForTerm(activeType,
191:                            expression, term, (i < terms.length - 1));
192:
193:                    if (readMethod == null) {
194:                        writeOnly = true;
195:                        break;
196:                    }
197:
198:                    // If a primitive type, convert to wrapper type
199:
200:                    Class termType = ClassFabUtils.getWrapperType(readMethod
201:                            .getReturnType());
202:
203:                    // $w is harmless for non-wrapper types.
204:
205:                    builder.addln("%s %s = ($w) %s.%s();", ClassFabUtils
206:                            .toJavaClassName(termType), this Step, previousStep,
207:                            readMethod.getName());
208:
209:                    if (nullable)
210:                        builder.addln("if (%s == null) return null;", this Step);
211:
212:                    activeType = termType;
213:                    result = readMethod;
214:                    previousStep = this Step;
215:                }
216:
217:                builder.addln("return %s;", previousStep);
218:
219:                builder.end();
220:
221:                if (writeOnly) {
222:                    builder.clear();
223:                    builder
224:                            .addln(
225:                                    "throw new java.lang.RuntimeException(\"Expression %s for class %s is write-only.\");",
226:                                    expression, rootClass.getName());
227:                }
228:
229:                classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder
230:                        .toString());
231:
232:                return result;
233:            }
234:
235:            private Method buildSetter(Class rootClass, ClassFab classFab,
236:                    String expression, String[] terms) {
237:                BodyBuilder builder = new BodyBuilder();
238:                builder.begin();
239:
240:                builder.addln("%s root = (%<s) $1;", ClassFabUtils
241:                        .toJavaClassName(rootClass));
242:                String previousStep = "root";
243:
244:                Class activeType = rootClass;
245:
246:                for (int i = 0; i < terms.length - 1; i++) {
247:                    String this Step = "step" + (i + 1);
248:                    String term = terms[i];
249:
250:                    boolean nullable = term.endsWith("?");
251:                    if (nullable)
252:                        term = term.substring(0, term.length() - 1);
253:
254:                    Method readMethod = readMethodForTerm(activeType,
255:                            expression, term, true);
256:
257:                    // If a primitive type, convert to wrapper type
258:
259:                    Class termType = ClassFabUtils.getWrapperType(readMethod
260:                            .getReturnType());
261:
262:                    // $w is harmless for non-wrapper types.
263:
264:                    builder.addln("%s %s = ($w) %s.%s();", ClassFabUtils
265:                            .toJavaClassName(termType), this Step, previousStep,
266:                            readMethod.getName());
267:
268:                    if (nullable)
269:                        builder.addln("if (%s == null) return;", this Step);
270:
271:                    activeType = termType;
272:                    previousStep = this Step;
273:                }
274:
275:                // When writing, the last step is different.
276:
277:                Method writeMethod = writeMethodForTerm(activeType, expression,
278:                        terms[terms.length - 1]);
279:
280:                if (writeMethod == null) {
281:                    builder.clear();
282:                    builder
283:                            .addln(
284:                                    "throw new java.lang.RuntimeException(\"Expression %s for class %s is read-only.\");",
285:                                    expression, rootClass.getName());
286:                    classFab.addMethod(Modifier.PUBLIC, SET_SIGNATURE, builder
287:                            .toString());
288:
289:                    return null;
290:                }
291:
292:                Class parameterType = writeMethod.getParameterTypes()[0];
293:
294:                Class wrapperType = ClassFabUtils.getWrapperType(parameterType);
295:
296:                builder.addln("%s value = (%<s) $2;", ClassFabUtils
297:                        .toJavaClassName(wrapperType));
298:
299:                builder.add("%s.%s(value", previousStep, writeMethod.getName());
300:
301:                if (parameterType != wrapperType)
302:                    builder.add(".%s()", ClassFabUtils
303:                            .getUnwrapMethodName(parameterType.getName()));
304:
305:                builder.addln(");");
306:
307:                builder.end();
308:
309:                classFab.addMethod(Modifier.PUBLIC, SET_SIGNATURE, builder
310:                        .toString());
311:
312:                return writeMethod;
313:            }
314:
315:            private Method writeMethodForTerm(Class activeType,
316:                    String expression, String term) {
317:                if (term.endsWith(PARENS))
318:                    return null;
319:
320:                PropertyAdapter adapter = _access.getAdapter(activeType)
321:                        .getPropertyAdapter(term);
322:
323:                if (adapter == null)
324:                    throw new RuntimeException(ServicesMessages.noSuchProperty(
325:                            activeType, term, expression));
326:
327:                return adapter.getWriteMethod();
328:            }
329:
330:            private Method readMethodForTerm(Class activeType,
331:                    String expression, String term, boolean mustExist) {
332:                if (term.endsWith(PARENS)) {
333:                    Method method = null;
334:                    String methodName = term.substring(0, term.length()
335:                            - PARENS.length());
336:
337:                    try {
338:                        method = activeType.getMethod(methodName);
339:                    } catch (NoSuchMethodException ex) {
340:                        throw new RuntimeException(ServicesMessages
341:                                .methodNotFound(term, activeType, expression),
342:                                ex);
343:                    }
344:
345:                    if (method.getReturnType().equals(void.class))
346:                        throw new RuntimeException(ServicesMessages
347:                                .methodIsVoid(term, activeType, expression));
348:
349:                    return method;
350:                }
351:
352:                PropertyAdapter adapter = _access.getAdapter(activeType)
353:                        .getPropertyAdapter(term);
354:
355:                if (adapter == null)
356:                    throw new RuntimeException(ServicesMessages.noSuchProperty(
357:                            activeType, term, expression));
358:
359:                Method m = adapter.getReadMethod();
360:
361:                if (m == null && mustExist)
362:                    throw new RuntimeException(ServicesMessages
363:                            .writeOnlyProperty(term, activeType, expression));
364:
365:                return m;
366:            }
367:        }
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