1 /* 2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.apt.mirror.declaration; 27 28 29 import java.lang.annotation.*; 30 import java.lang.reflect.Array; 31 import java.lang.reflect.Method; 32 import java.util.*; 33 import sun.reflect.annotation.*; 34 35 import com.sun.mirror.type.TypeMirror; 36 import com.sun.mirror.type.MirroredTypeException; 37 import com.sun.mirror.type.MirroredTypesException; 38 import com.sun.tools.apt.mirror.AptEnv; 39 import com.sun.tools.javac.code.*; 40 import com.sun.tools.javac.code.Symbol.*; 41 import com.sun.tools.javac.util.Name; 42 import com.sun.tools.javac.util.Pair; 43 44 45 /** 46 * A generator of dynamic proxy implementations of 47 * java.lang.annotation.Annotation. 48 * 49 * <p> The "dynamic proxy return form" of an attribute element value is 50 * the form used by sun.reflect.annotation.AnnotationInvocationHandler. 51 */ 52 @SuppressWarnings("deprecation") 53 class AnnotationProxyMaker { 54 55 private final AptEnv env; 56 private final Attribute.Compound attrs; 57 private final Class<? extends Annotation> annoType; 58 59 60 private AnnotationProxyMaker(AptEnv env, 61 Attribute.Compound attrs, 62 Class<? extends Annotation> annoType) { 63 this.env = env; 64 this.attrs = attrs; 65 this.annoType = annoType; 66 } 67 68 69 /** 70 * Returns a dynamic proxy for an annotation mirror. 71 */ 72 public static <A extends Annotation> A generateAnnotation( 73 AptEnv env, Attribute.Compound attrs, Class<A> annoType) { 74 AnnotationProxyMaker apm = new AnnotationProxyMaker(env, attrs, annoType); 75 return annoType.cast(apm.generateAnnotation()); 76 } 77 78 79 /** 80 * Returns a dynamic proxy for an annotation mirror. 81 */ 82 private Annotation generateAnnotation() { 83 return AnnotationParser.annotationForMap(annoType, 84 getAllReflectedValues()); 85 } 86 87 /** 88 * Returns a map from element names to their values in "dynamic 89 * proxy return form". Includes all elements, whether explicit or 90 * defaulted. 91 */ 92 private Map<String, Object> getAllReflectedValues() { 93 Map<String, Object> res = new LinkedHashMap<String, Object>(); 94 95 for (Map.Entry<MethodSymbol, Attribute> entry : 96 getAllValues().entrySet()) { 97 MethodSymbol meth = entry.getKey(); 98 Object value = generateValue(meth, entry.getValue()); 99 if (value != null) { 100 res.put(meth.name.toString(), value); 101 } else { 102 // Ignore this element. May lead to 103 // IncompleteAnnotationException somewhere down the line. 104 } 105 } 106 return res; 107 } 108 109 /** 110 * Returns a map from element symbols to their values. 111 * Includes all elements, whether explicit or defaulted. 112 */ 113 private Map<MethodSymbol, Attribute> getAllValues() { 114 Map<MethodSymbol, Attribute> res = 115 new LinkedHashMap<MethodSymbol, Attribute>(); 116 117 // First find the default values. 118 ClassSymbol sym = (ClassSymbol) attrs.type.tsym; 119 for (Scope.Entry e = sym.members().elems; e != null; e = e.sibling) { 120 if (e.sym.kind == Kinds.MTH) { 121 MethodSymbol m = (MethodSymbol) e.sym; 122 Attribute def = m.defaultValue; 123 if (def != null) { 124 res.put(m, def); 125 } 126 } 127 } 128 // Next find the explicit values, possibly overriding defaults. 129 for (Pair<MethodSymbol, Attribute> p : attrs.values) { 130 res.put(p.fst, p.snd); 131 } 132 return res; 133 } 134 135 /** 136 * Converts an element value to its "dynamic proxy return form". 137 * Returns an exception proxy on some errors, but may return null if 138 * a useful exception cannot or should not be generated at this point. 139 */ 140 private Object generateValue(MethodSymbol meth, Attribute attr) { 141 ValueVisitor vv = new ValueVisitor(meth); 142 return vv.getValue(attr); 143 } 144 145 146 private class ValueVisitor implements Attribute.Visitor { 147 148 private MethodSymbol meth; // annotation element being visited 149 private Class<?> runtimeType; // runtime type of annotation element 150 private Object value; // value in "dynamic proxy return form" 151 152 ValueVisitor(MethodSymbol meth) { 153 this.meth = meth; 154 } 155 156 Object getValue(Attribute attr) { 157 Method method; // runtime method of annotation element 158 try { 159 method = annoType.getMethod(meth.name.toString()); 160 } catch (NoSuchMethodException e) { 161 return null; 162 } 163 runtimeType = method.getReturnType(); 164 attr.accept(this); 165 if (!(value instanceof ExceptionProxy) && 166 !AnnotationType.invocationHandlerReturnType(runtimeType) 167 .isInstance(value)) { 168 typeMismatch(method, attr); 169 } 170 return value; 171 } 172 173 174 public void visitConstant(Attribute.Constant c) { 175 value = Constants.decodeConstant(c.value, c.type); 176 } 177 178 public void visitClass(Attribute.Class c) { 179 value = new MirroredTypeExceptionProxy( 180 env.typeMaker.getType(c.type)); 181 } 182 183 public void visitArray(Attribute.Array a) { 184 Type elemtype = env.jctypes.elemtype(a.type); 185 186 if (elemtype.tsym == env.symtab.classType.tsym) { // Class[] 187 // Construct a proxy for a MirroredTypesException 188 ArrayList<TypeMirror> elems = new ArrayList<TypeMirror>(); 189 for (int i = 0; i < a.values.length; i++) { 190 Type elem = ((Attribute.Class) a.values[i]).type; 191 elems.add(env.typeMaker.getType(elem)); 192 } 193 value = new MirroredTypesExceptionProxy(elems); 194 195 } else { 196 int len = a.values.length; 197 Class<?> runtimeTypeSaved = runtimeType; 198 runtimeType = runtimeType.getComponentType(); 199 try { 200 Object res = Array.newInstance(runtimeType, len); 201 for (int i = 0; i < len; i++) { 202 a.values[i].accept(this); 203 if (value == null || value instanceof ExceptionProxy) { 204 return; 205 } 206 try { 207 Array.set(res, i, value); 208 } catch (IllegalArgumentException e) { 209 value = null; // indicates a type mismatch 210 return; 211 } 212 } 213 value = res; 214 } finally { 215 runtimeType = runtimeTypeSaved; 216 } 217 } 218 } 219 220 @SuppressWarnings({"unchecked", "rawtypes"}) 221 public void visitEnum(Attribute.Enum e) { 222 if (runtimeType.isEnum()) { 223 String constName = e.value.toString(); 224 try { 225 value = Enum.valueOf((Class)runtimeType, constName); 226 } catch (IllegalArgumentException ex) { 227 value = new EnumConstantNotPresentExceptionProxy( 228 (Class<Enum<?>>)runtimeType, constName); 229 } 230 } else { 231 value = null; // indicates a type mismatch 232 } 233 } 234 235 public void visitCompound(Attribute.Compound c) { 236 try { 237 Class<? extends Annotation> nested = 238 runtimeType.asSubclass(Annotation.class); 239 value = generateAnnotation(env, c, nested); 240 } catch (ClassCastException ex) { 241 value = null; // indicates a type mismatch 242 } 243 } 244 245 public void visitError(Attribute.Error e) { 246 value = null; // indicates a type mismatch 247 } 248 249 250 /** 251 * Sets "value" to an ExceptionProxy indicating a type mismatch. 252 */ 253 private void typeMismatch(Method method, final Attribute attr) { 254 class AnnotationTypeMismatchExceptionProxy extends ExceptionProxy { 255 private static final long serialVersionUID = 8473323277815075163L; 256 transient final Method method; 257 AnnotationTypeMismatchExceptionProxy(Method method) { 258 this.method = method; 259 } 260 public String toString() { 261 return "<error>"; // eg: @Anno(value=<error>) 262 } 263 protected RuntimeException generateException() { 264 return new AnnotationTypeMismatchException(method, 265 attr.type.toString()); 266 } 267 } 268 value = new AnnotationTypeMismatchExceptionProxy(method); 269 } 270 } 271 272 273 /** 274 * ExceptionProxy for MirroredTypeException. 275 * The toString, hashCode, and equals methods foward to the underlying 276 * type. 277 */ 278 private static final class MirroredTypeExceptionProxy extends ExceptionProxy { 279 private static final long serialVersionUID = 6662035281599933545L; 280 281 private MirroredTypeException ex; 282 283 MirroredTypeExceptionProxy(TypeMirror t) { 284 // It would be safer if we could construct the exception in 285 // generateException(), but there would be no way to do 286 // that properly following deserialization. 287 ex = new MirroredTypeException(t); 288 } 289 290 public String toString() { 291 return ex.getQualifiedName(); 292 } 293 294 public int hashCode() { 295 TypeMirror t = ex.getTypeMirror(); 296 return (t != null) 297 ? t.hashCode() 298 : ex.getQualifiedName().hashCode(); 299 } 300 301 public boolean equals(Object obj) { 302 TypeMirror t = ex.getTypeMirror(); 303 return t != null && 304 obj instanceof MirroredTypeExceptionProxy && 305 t.equals( 306 ((MirroredTypeExceptionProxy) obj).ex.getTypeMirror()); 307 } 308 309 protected RuntimeException generateException() { 310 return (RuntimeException) ex.fillInStackTrace(); 311 } 312 } 313 314 315 /** 316 * ExceptionProxy for MirroredTypesException. 317 * The toString, hashCode, and equals methods foward to the underlying 318 * types. 319 */ 320 private static final class MirroredTypesExceptionProxy extends ExceptionProxy { 321 private static final long serialVersionUID = -6670822532616693951L; 322 323 private MirroredTypesException ex; 324 325 MirroredTypesExceptionProxy(Collection<TypeMirror> ts) { 326 // It would be safer if we could construct the exception in 327 // generateException(), but there would be no way to do 328 // that properly following deserialization. 329 ex = new MirroredTypesException(ts); 330 } 331 332 public String toString() { 333 return ex.getQualifiedNames().toString(); 334 } 335 336 public int hashCode() { 337 Collection<TypeMirror> ts = ex.getTypeMirrors(); 338 return (ts != null) 339 ? ts.hashCode() 340 : ex.getQualifiedNames().hashCode(); 341 } 342 343 public boolean equals(Object obj) { 344 Collection<TypeMirror> ts = ex.getTypeMirrors(); 345 return ts != null && 346 obj instanceof MirroredTypesExceptionProxy && 347 ts.equals( 348 ((MirroredTypesExceptionProxy) obj).ex.getTypeMirrors()); 349 } 350 351 protected RuntimeException generateException() { 352 return (RuntimeException) ex.fillInStackTrace(); 353 } 354 } 355 }