Source Code Cross Referenced for AnnotationProxyMaker.java in  » 6.0-JDK-Modules-sun » javac-compiler » com » sun » tools » javac » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules sun » javac compiler » com.sun.tools.javac.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
003:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004:         *
005:         * This code is free software; you can redistribute it and/or modify it
006:         * under the terms of the GNU General Public License version 2 only, as
007:         * published by the Free Software Foundation.  Sun designates this
008:         * particular file as subject to the "Classpath" exception as provided
009:         * by Sun in the LICENSE file that accompanied this code.
010:         *
011:         * This code is distributed in the hope that it will be useful, but WITHOUT
012:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014:         * version 2 for more details (a copy is included in the LICENSE file that
015:         * accompanied this code).
016:         *
017:         * You should have received a copy of the GNU General Public License version
018:         * 2 along with this work; if not, write to the Free Software Foundation,
019:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020:         *
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022:         * CA 95054 USA or visit www.sun.com if you need additional information or
023:         * have any questions.
024:         */
025:
026:        package com.sun.tools.javac.model;
027:
028:        import com.sun.tools.javac.util.*;
029:        import java.lang.annotation.*;
030:        import java.lang.reflect.Array;
031:        import java.lang.reflect.Method;
032:        import java.util.LinkedHashMap;
033:        import java.util.Map;
034:        import sun.reflect.annotation.*;
035:
036:        import javax.lang.model.type.TypeMirror;
037:        import javax.lang.model.type.MirroredTypeException;
038:        import javax.lang.model.type.MirroredTypesException;
039:        import com.sun.tools.javac.code.*;
040:        import com.sun.tools.javac.code.Symbol.*;
041:        import com.sun.tools.javac.code.Type.ArrayType;
042:
043:        /**
044:         * A generator of dynamic proxy implementations of
045:         * java.lang.annotation.Annotation.
046:         *
047:         * <p> The "dynamic proxy return form" of an annotation element value is
048:         * the form used by sun.reflect.annotation.AnnotationInvocationHandler.
049:         *
050:         * <p><b>This is NOT part of any API supported by Sun Microsystems.  If
051:         * you write code that depends on this, you do so at your own risk.
052:         * This code and its internal interfaces are subject to change or
053:         * deletion without notice.</b>
054:         */
055:
056:        public class AnnotationProxyMaker {
057:
058:            private final Attribute.Compound anno;
059:            private final Class<? extends Annotation> annoType;
060:
061:            private AnnotationProxyMaker(Attribute.Compound anno,
062:                    Class<? extends Annotation> annoType) {
063:                this .anno = anno;
064:                this .annoType = annoType;
065:            }
066:
067:            /**
068:             * Returns a dynamic proxy for an annotation mirror.
069:             */
070:            public static <A extends Annotation> A generateAnnotation(
071:                    Attribute.Compound anno, Class<A> annoType) {
072:                AnnotationProxyMaker apm = new AnnotationProxyMaker(anno,
073:                        annoType);
074:                return annoType.cast(apm.generateAnnotation());
075:            }
076:
077:            /**
078:             * Returns a dynamic proxy for an annotation mirror.
079:             */
080:            private Annotation generateAnnotation() {
081:                return AnnotationParser.annotationForMap(annoType,
082:                        getAllReflectedValues());
083:            }
084:
085:            /**
086:             * Returns a map from element names to their values in "dynamic
087:             * proxy return form".  Includes all elements, whether explicit or
088:             * defaulted.
089:             */
090:            private Map<String, Object> getAllReflectedValues() {
091:                Map<String, Object> res = new LinkedHashMap<String, Object>();
092:
093:                for (Map.Entry<MethodSymbol, Attribute> entry : getAllValues()
094:                        .entrySet()) {
095:                    MethodSymbol meth = entry.getKey();
096:                    Object value = generateValue(meth, entry.getValue());
097:                    if (value != null) {
098:                        res.put(meth.name.toString(), value);
099:                    } else {
100:                        // Ignore this element.  May (properly) lead to
101:                        // IncompleteAnnotationException somewhere down the line.
102:                    }
103:                }
104:                return res;
105:            }
106:
107:            /**
108:             * Returns a map from element symbols to their values.
109:             * Includes all elements, whether explicit or defaulted.
110:             */
111:            private Map<MethodSymbol, Attribute> getAllValues() {
112:                Map<MethodSymbol, Attribute> res = new LinkedHashMap<MethodSymbol, Attribute>();
113:
114:                // First find the default values.
115:                ClassSymbol sym = (ClassSymbol) anno.type.tsym;
116:                for (Scope.Entry e = sym.members().elems; e != null; e = e.sibling) {
117:                    if (e.sym.kind == Kinds.MTH) {
118:                        MethodSymbol m = (MethodSymbol) e.sym;
119:                        Attribute def = m.getDefaultValue();
120:                        if (def != null)
121:                            res.put(m, def);
122:                    }
123:                }
124:                // Next find the explicit values, possibly overriding defaults.
125:                for (Pair<MethodSymbol, Attribute> p : anno.values)
126:                    res.put(p.fst, p.snd);
127:                return res;
128:            }
129:
130:            /**
131:             * Converts an element value to its "dynamic proxy return form".
132:             * Returns an exception proxy on some errors, but may return null if
133:             * a useful exception cannot or should not be generated at this point.
134:             */
135:            private Object generateValue(MethodSymbol meth, Attribute attr) {
136:                ValueVisitor vv = new ValueVisitor(meth);
137:                return vv.getValue(attr);
138:            }
139:
140:            private class ValueVisitor implements  Attribute.Visitor {
141:
142:                private MethodSymbol meth; // annotation element being visited
143:                private Class<?> returnClass; // return type of annotation element
144:                private Object value; // value in "dynamic proxy return form"
145:
146:                ValueVisitor(MethodSymbol meth) {
147:                    this .meth = meth;
148:                }
149:
150:                Object getValue(Attribute attr) {
151:                    Method method; // runtime method of annotation element
152:                    try {
153:                        method = annoType.getMethod(meth.name.toString());
154:                    } catch (NoSuchMethodException e) {
155:                        return null;
156:                    }
157:                    returnClass = method.getReturnType();
158:                    attr.accept(this );
159:                    if (!(value instanceof  ExceptionProxy)
160:                            && !AnnotationType.invocationHandlerReturnType(
161:                                    returnClass).isInstance(value)) {
162:                        typeMismatch(method, attr);
163:                    }
164:                    return value;
165:                }
166:
167:                public void visitConstant(Attribute.Constant c) {
168:                    value = c.getValue();
169:                }
170:
171:                public void visitClass(Attribute.Class c) {
172:                    value = new MirroredTypeExceptionProxy(c.type);
173:                }
174:
175:                public void visitArray(Attribute.Array a) {
176:                    Name elemName = ((ArrayType) a.type).elemtype.tsym.name;
177:
178:                    if (elemName == elemName.table.java_lang_Class) { // Class[]
179:                        // Construct a proxy for a MirroredTypesException
180:                        List<TypeMirror> elems = List.nil();
181:                        for (Attribute value : a.values) {
182:                            Type elem = ((Attribute.Class) value).type;
183:                            elems.add(elem);
184:                        }
185:                        value = new MirroredTypesExceptionProxy(elems);
186:
187:                    } else {
188:                        int len = a.values.length;
189:                        Class<?> returnClassSaved = returnClass;
190:                        returnClass = returnClass.getComponentType();
191:                        try {
192:                            Object res = Array.newInstance(returnClass, len);
193:                            for (int i = 0; i < len; i++) {
194:                                a.values[i].accept(this );
195:                                if (value == null
196:                                        || value instanceof  ExceptionProxy) {
197:                                    return;
198:                                }
199:                                try {
200:                                    Array.set(res, i, value);
201:                                } catch (IllegalArgumentException e) {
202:                                    value = null; // indicates a type mismatch
203:                                    return;
204:                                }
205:                            }
206:                            value = res;
207:                        } finally {
208:                            returnClass = returnClassSaved;
209:                        }
210:                    }
211:                }
212:
213:                @SuppressWarnings("unchecked")
214:                public void visitEnum(Attribute.Enum e) {
215:                    if (returnClass.isEnum()) {
216:                        String constName = e.value.toString();
217:                        try {
218:                            value = Enum
219:                                    .valueOf((Class) returnClass, constName);
220:                        } catch (IllegalArgumentException ex) {
221:                            value = new EnumConstantNotPresentExceptionProxy(
222:                                    (Class) returnClass, constName);
223:                        }
224:                    } else {
225:                        value = null; // indicates a type mismatch
226:                    }
227:                }
228:
229:                public void visitCompound(Attribute.Compound c) {
230:                    try {
231:                        Class<? extends Annotation> nested = returnClass
232:                                .asSubclass(Annotation.class);
233:                        value = generateAnnotation(c, nested);
234:                    } catch (ClassCastException ex) {
235:                        value = null; // indicates a type mismatch
236:                    }
237:                }
238:
239:                public void visitError(Attribute.Error e) {
240:                    value = null; // indicates a type mismatch
241:                }
242:
243:                /**
244:                 * Sets "value" to an ExceptionProxy indicating a type mismatch.
245:                 */
246:                private void typeMismatch(final Method method,
247:                        final Attribute attr) {
248:                    value = new ExceptionProxy() {
249:                        static final long serialVersionUID = 269;
250:
251:                        public String toString() {
252:                            return "<error>"; // eg:  @Anno(value=<error>)
253:                        }
254:
255:                        protected RuntimeException generateException() {
256:                            return new AnnotationTypeMismatchException(method,
257:                                    attr.type.toString());
258:                        }
259:                    };
260:                }
261:            }
262:
263:            /**
264:             * ExceptionProxy for MirroredTypeException.
265:             * The toString, hashCode, and equals methods foward to the underlying
266:             * type.
267:             */
268:            private static class MirroredTypeExceptionProxy extends
269:                    ExceptionProxy {
270:                static final long serialVersionUID = 269;
271:
272:                private transient final TypeMirror type;
273:                private final String typeString;
274:
275:                MirroredTypeExceptionProxy(TypeMirror t) {
276:                    type = t;
277:                    typeString = t.toString();
278:                }
279:
280:                public String toString() {
281:                    return typeString;
282:                }
283:
284:                public int hashCode() {
285:                    return (type != null ? type : typeString).hashCode();
286:                }
287:
288:                public boolean equals(Object obj) {
289:                    return type != null
290:                            && obj instanceof  MirroredTypeExceptionProxy
291:                            && type
292:                                    .equals(((MirroredTypeExceptionProxy) obj).type);
293:                }
294:
295:                protected RuntimeException generateException() {
296:                    return new MirroredTypeException(type);
297:                }
298:            }
299:
300:            /**
301:             * ExceptionProxy for MirroredTypesException.
302:             * The toString, hashCode, and equals methods foward to the underlying
303:             * types.
304:             */
305:            private static class MirroredTypesExceptionProxy extends
306:                    ExceptionProxy {
307:                static final long serialVersionUID = 269;
308:
309:                private transient final List<TypeMirror> types;
310:                private final String typeStrings;
311:
312:                MirroredTypesExceptionProxy(List<TypeMirror> ts) {
313:                    types = ts;
314:                    typeStrings = ts.toString();
315:                }
316:
317:                public String toString() {
318:                    return typeStrings;
319:                }
320:
321:                public int hashCode() {
322:                    return (types != null ? types : typeStrings).hashCode();
323:                }
324:
325:                public boolean equals(Object obj) {
326:                    return types != null
327:                            && obj instanceof  MirroredTypesExceptionProxy
328:                            && types
329:                                    .equals(((MirroredTypesExceptionProxy) obj).types);
330:                }
331:
332:                protected RuntimeException generateException() {
333:                    return new MirroredTypesException(types);
334:                }
335:            }
336:        }
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