Wed, 16 Jan 2013 13:22:09 -0800
8006283: Change to Class.cast() in javax.lang.model implementation for repeating annotations
Reviewed-by: jjg
duke@1 | 1 | /* |
jfranck@1491 | 2 | * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@1 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@1 | 4 | * |
duke@1 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@1 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ohair@554 | 7 | * published by the Free Software Foundation. Oracle designates this |
duke@1 | 8 | * particular file as subject to the "Classpath" exception as provided |
ohair@554 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
duke@1 | 10 | * |
duke@1 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@1 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@1 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@1 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@1 | 15 | * accompanied this code). |
duke@1 | 16 | * |
duke@1 | 17 | * You should have received a copy of the GNU General Public License version |
duke@1 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@1 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@1 | 20 | * |
ohair@554 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
ohair@554 | 22 | * or visit www.oracle.com if you need additional information or have any |
ohair@554 | 23 | * questions. |
duke@1 | 24 | */ |
duke@1 | 25 | |
duke@1 | 26 | package com.sun.tools.javac.model; |
duke@1 | 27 | |
duke@1 | 28 | import java.lang.annotation.Annotation; |
duke@1 | 29 | import java.lang.annotation.Inherited; |
jfranck@1491 | 30 | import java.lang.reflect.InvocationTargetException; |
jfranck@1491 | 31 | import java.lang.reflect.Method; |
duke@1 | 32 | import java.util.Map; |
jjg@1280 | 33 | |
duke@1 | 34 | import javax.lang.model.SourceVersion; |
duke@1 | 35 | import javax.lang.model.element.*; |
duke@1 | 36 | import javax.lang.model.type.DeclaredType; |
duke@1 | 37 | import javax.lang.model.util.Elements; |
duke@1 | 38 | import javax.tools.JavaFileObject; |
jjg@1280 | 39 | import static javax.lang.model.util.ElementFilter.methodsIn; |
jjg@1280 | 40 | |
duke@1 | 41 | import com.sun.tools.javac.code.*; |
duke@1 | 42 | import com.sun.tools.javac.code.Symbol.*; |
jjg@1374 | 43 | import com.sun.tools.javac.code.TypeTag; |
duke@1 | 44 | import com.sun.tools.javac.comp.AttrContext; |
duke@1 | 45 | import com.sun.tools.javac.comp.Enter; |
duke@1 | 46 | import com.sun.tools.javac.comp.Env; |
duke@1 | 47 | import com.sun.tools.javac.main.JavaCompiler; |
duke@1 | 48 | import com.sun.tools.javac.processing.PrintingProcessor; |
duke@1 | 49 | import com.sun.tools.javac.tree.JCTree; |
duke@1 | 50 | import com.sun.tools.javac.tree.JCTree.*; |
duke@1 | 51 | import com.sun.tools.javac.tree.TreeInfo; |
duke@1 | 52 | import com.sun.tools.javac.tree.TreeScanner; |
jjg@113 | 53 | import com.sun.tools.javac.util.*; |
duke@1 | 54 | import com.sun.tools.javac.util.Name; |
jjg@1374 | 55 | import static com.sun.tools.javac.code.TypeTag.CLASS; |
jjg@1127 | 56 | import static com.sun.tools.javac.tree.JCTree.Tag.*; |
duke@1 | 57 | |
duke@1 | 58 | /** |
duke@1 | 59 | * Utility methods for operating on program elements. |
duke@1 | 60 | * |
jjg@581 | 61 | * <p><b>This is NOT part of any supported API. |
duke@1 | 62 | * If you write code that depends on this, you do so at your own |
duke@1 | 63 | * risk. This code and its internal interfaces are subject to change |
duke@1 | 64 | * or deletion without notice.</b></p> |
duke@1 | 65 | */ |
duke@1 | 66 | public class JavacElements implements Elements { |
duke@1 | 67 | |
duke@1 | 68 | private JavaCompiler javaCompiler; |
duke@1 | 69 | private Symtab syms; |
jjg@113 | 70 | private Names names; |
duke@1 | 71 | private Types types; |
duke@1 | 72 | private Enter enter; |
duke@1 | 73 | |
duke@1 | 74 | public static JavacElements instance(Context context) { |
jjg@706 | 75 | JavacElements instance = context.get(JavacElements.class); |
jjg@706 | 76 | if (instance == null) |
duke@1 | 77 | instance = new JavacElements(context); |
duke@1 | 78 | return instance; |
duke@1 | 79 | } |
duke@1 | 80 | |
duke@1 | 81 | /** |
duke@1 | 82 | * Public for use only by JavacProcessingEnvironment |
duke@1 | 83 | */ |
jjg@706 | 84 | protected JavacElements(Context context) { |
duke@1 | 85 | setContext(context); |
duke@1 | 86 | } |
duke@1 | 87 | |
duke@1 | 88 | /** |
duke@1 | 89 | * Use a new context. May be called from outside to update |
duke@1 | 90 | * internal state for a new annotation-processing round. |
duke@1 | 91 | */ |
duke@1 | 92 | public void setContext(Context context) { |
jjg@706 | 93 | context.put(JavacElements.class, this); |
duke@1 | 94 | javaCompiler = JavaCompiler.instance(context); |
duke@1 | 95 | syms = Symtab.instance(context); |
jjg@113 | 96 | names = Names.instance(context); |
duke@1 | 97 | types = Types.instance(context); |
duke@1 | 98 | enter = Enter.instance(context); |
duke@1 | 99 | } |
duke@1 | 100 | |
duke@1 | 101 | /** |
jfranck@1491 | 102 | * An internal-use utility that creates a runtime view of an |
jfranck@1491 | 103 | * annotation. This is the implementation of |
jfranck@1491 | 104 | * Element.getAnnotation(Class). |
duke@1 | 105 | */ |
duke@1 | 106 | public static <A extends Annotation> A getAnnotation(Symbol annotated, |
duke@1 | 107 | Class<A> annoType) { |
duke@1 | 108 | if (!annoType.isAnnotation()) |
duke@1 | 109 | throw new IllegalArgumentException("Not an annotation type: " |
duke@1 | 110 | + annoType); |
jfranck@1491 | 111 | Attribute.Compound c; |
jfranck@1491 | 112 | if (annotated.kind == Kinds.TYP && annotated instanceof ClassSymbol) { |
jfranck@1491 | 113 | c = getAttributeOnClass((ClassSymbol)annotated, annoType); |
jfranck@1491 | 114 | } else { |
jfranck@1491 | 115 | c = getAttribute(annotated, annoType); |
jfranck@1491 | 116 | } |
jfranck@1491 | 117 | return c == null ? null : AnnotationProxyMaker.generateAnnotation(c, annoType); |
jfranck@1491 | 118 | } |
jfranck@1491 | 119 | |
jfranck@1491 | 120 | // Helper to getAnnotation[s] |
jfranck@1491 | 121 | private static <A extends Annotation> Attribute.Compound getAttribute(Symbol annotated, |
jfranck@1491 | 122 | Class<A> annoType) { |
duke@1 | 123 | String name = annoType.getName(); |
jfranck@1491 | 124 | |
jfranck@1491 | 125 | for (Attribute.Compound anno : annotated.getRawAttributes()) |
duke@1 | 126 | if (name.equals(anno.type.tsym.flatName().toString())) |
jfranck@1491 | 127 | return anno; |
jfranck@1491 | 128 | |
duke@1 | 129 | return null; |
duke@1 | 130 | } |
jfranck@1491 | 131 | // Helper to getAnnotation[s] |
jfranck@1491 | 132 | private static <A extends Annotation> Attribute.Compound getAttributeOnClass(ClassSymbol annotated, |
jfranck@1491 | 133 | Class<A> annoType) { |
duke@1 | 134 | boolean inherited = annoType.isAnnotationPresent(Inherited.class); |
jfranck@1491 | 135 | Attribute.Compound result = null; |
jjg@113 | 136 | while (annotated.name != annotated.name.table.names.java_lang_Object) { |
jfranck@1491 | 137 | result = getAttribute(annotated, annoType); |
duke@1 | 138 | if (result != null || !inherited) |
duke@1 | 139 | break; |
duke@1 | 140 | Type sup = annotated.getSuperclass(); |
jjg@1374 | 141 | if (!sup.hasTag(CLASS) || sup.isErroneous()) |
duke@1 | 142 | break; |
duke@1 | 143 | annotated = (ClassSymbol) sup.tsym; |
duke@1 | 144 | } |
duke@1 | 145 | return result; |
duke@1 | 146 | } |
duke@1 | 147 | |
jfranck@1491 | 148 | /** |
jfranck@1491 | 149 | * An internal-use utility that creates a runtime view of |
jfranck@1491 | 150 | * annotations. This is the implementation of |
jfranck@1491 | 151 | * Element.getAnnotations(Class). |
jfranck@1491 | 152 | */ |
jfranck@1491 | 153 | public static <A extends Annotation> A[] getAnnotations(Symbol annotated, |
jfranck@1491 | 154 | Class<A> annoType) { |
jfranck@1491 | 155 | if (!annoType.isAnnotation()) |
jfranck@1491 | 156 | throw new IllegalArgumentException("Not an annotation type: " |
jfranck@1491 | 157 | + annoType); |
jfranck@1491 | 158 | // If annoType does not declare a container this is equivalent to wrapping |
jfranck@1491 | 159 | // getAnnotation(...) in an array. |
jfranck@1491 | 160 | Class <? extends Annotation> containerType = getContainer(annoType); |
jfranck@1491 | 161 | if (containerType == null) { |
jfranck@1491 | 162 | A res = getAnnotation(annotated, annoType); |
jfranck@1491 | 163 | int size; |
jfranck@1491 | 164 | if (res == null) { |
jfranck@1491 | 165 | size = 0; |
jfranck@1491 | 166 | } else { |
jfranck@1491 | 167 | size = 1; |
jfranck@1491 | 168 | } |
jfranck@1491 | 169 | @SuppressWarnings("unchecked") // annoType is the Class for A |
jfranck@1491 | 170 | A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size); |
jfranck@1491 | 171 | if (res != null) |
jfranck@1491 | 172 | arr[0] = res; |
jfranck@1491 | 173 | return arr; |
jfranck@1491 | 174 | } |
jfranck@1491 | 175 | |
jfranck@1491 | 176 | // So we have a containing type |
jfranck@1491 | 177 | String name = annoType.getName(); |
jfranck@1491 | 178 | String annoTypeName = annoType.getSimpleName(); |
jfranck@1491 | 179 | String containerTypeName = containerType.getSimpleName(); |
jfranck@1491 | 180 | int directIndex = -1, containerIndex = -1; |
jfranck@1491 | 181 | Attribute.Compound direct = null, container = null; |
jfranck@1491 | 182 | Attribute.Compound[] rawAttributes = annotated.getRawAttributes().toArray(new Attribute.Compound[0]); |
jfranck@1491 | 183 | |
jfranck@1491 | 184 | // Find directly present annotations |
jfranck@1491 | 185 | for (int i = 0; i < rawAttributes.length; i++) { |
jfranck@1491 | 186 | if (annoTypeName.equals(rawAttributes[i].type.tsym.flatName().toString())) { |
jfranck@1491 | 187 | directIndex = i; |
jfranck@1491 | 188 | direct = rawAttributes[i]; |
jfranck@1491 | 189 | } else if(containerTypeName != null && |
jfranck@1491 | 190 | containerTypeName.equals(rawAttributes[i].type.tsym.flatName().toString())) { |
jfranck@1491 | 191 | containerIndex = i; |
jfranck@1491 | 192 | container = rawAttributes[i]; |
jfranck@1491 | 193 | } |
jfranck@1491 | 194 | } |
jfranck@1491 | 195 | // Deal with inherited annotations |
jfranck@1491 | 196 | if (annotated.kind == Kinds.TYP && |
jfranck@1491 | 197 | (annotated instanceof ClassSymbol)) { |
jfranck@1491 | 198 | ClassSymbol s = (ClassSymbol)annotated; |
jfranck@1491 | 199 | if (direct == null && container == null) { |
jfranck@1491 | 200 | direct = getAttributeOnClass(s, annoType); |
jfranck@1491 | 201 | container = getAttributeOnClass(s, containerType); |
jfranck@1491 | 202 | |
jfranck@1491 | 203 | // both are inherited and found, put container last |
jfranck@1491 | 204 | if (direct != null && container != null) { |
jfranck@1491 | 205 | directIndex = 0; |
jfranck@1491 | 206 | containerIndex = 1; |
jfranck@1491 | 207 | } else if (direct != null) { |
jfranck@1491 | 208 | directIndex = 0; |
jfranck@1491 | 209 | } else { |
jfranck@1491 | 210 | containerIndex = 0; |
jfranck@1491 | 211 | } |
jfranck@1491 | 212 | } else if (direct == null) { |
jfranck@1491 | 213 | direct = getAttributeOnClass(s, annoType); |
jfranck@1491 | 214 | if (direct != null) |
jfranck@1491 | 215 | directIndex = containerIndex + 1; |
jfranck@1491 | 216 | } else if (container == null) { |
jfranck@1491 | 217 | container = getAttributeOnClass(s, containerType); |
jfranck@1491 | 218 | if (container != null) |
jfranck@1491 | 219 | containerIndex = directIndex + 1; |
jfranck@1491 | 220 | } |
jfranck@1491 | 221 | } |
jfranck@1491 | 222 | |
jfranck@1491 | 223 | // Pack them in an array |
jfranck@1491 | 224 | Attribute[] contained0 = new Attribute[0]; |
jfranck@1491 | 225 | if (container != null) |
jfranck@1491 | 226 | contained0 = unpackAttributes(container); |
jfranck@1491 | 227 | ListBuffer<Attribute.Compound> compounds = ListBuffer.lb(); |
jfranck@1491 | 228 | for (Attribute a : contained0) |
jfranck@1491 | 229 | if (a instanceof Attribute.Compound) |
jfranck@1491 | 230 | compounds = compounds.append((Attribute.Compound)a); |
jfranck@1491 | 231 | Attribute.Compound[] contained = compounds.toArray(new Attribute.Compound[0]); |
jfranck@1491 | 232 | |
jfranck@1491 | 233 | int size = (direct == null ? 0 : 1) + contained.length; |
jfranck@1491 | 234 | @SuppressWarnings("unchecked") // annoType is the Class for A |
jfranck@1491 | 235 | A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size); |
jfranck@1491 | 236 | |
jfranck@1491 | 237 | // if direct && container, which is first? |
jfranck@1491 | 238 | int insert = -1; |
jfranck@1491 | 239 | int length = arr.length; |
jfranck@1491 | 240 | if (directIndex >= 0 && containerIndex >= 0) { |
jfranck@1491 | 241 | if (directIndex < containerIndex) { |
jfranck@1491 | 242 | arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType); |
jfranck@1491 | 243 | insert = 1; |
jfranck@1491 | 244 | } else { |
jfranck@1491 | 245 | arr[arr.length - 1] = AnnotationProxyMaker.generateAnnotation(direct, annoType); |
jfranck@1491 | 246 | insert = 0; |
jfranck@1491 | 247 | length--; |
jfranck@1491 | 248 | } |
jfranck@1491 | 249 | } else if (directIndex >= 0) { |
jfranck@1491 | 250 | arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType); |
jfranck@1491 | 251 | return arr; |
jfranck@1491 | 252 | } else { |
jfranck@1491 | 253 | // Only container |
jfranck@1491 | 254 | insert = 0; |
jfranck@1491 | 255 | } |
jfranck@1491 | 256 | |
jfranck@1491 | 257 | for (int i = 0; i + insert < length; i++) |
jfranck@1491 | 258 | arr[insert + i] = AnnotationProxyMaker.generateAnnotation(contained[i], annoType); |
jfranck@1491 | 259 | |
jfranck@1491 | 260 | return arr; |
jfranck@1491 | 261 | } |
jfranck@1491 | 262 | |
jfranck@1491 | 263 | // Needed to unpack the runtime view of containing annotations |
jjg@1492 | 264 | private static final Class<? extends Annotation> REPEATABLE_CLASS = initRepeatable(); |
jfranck@1491 | 265 | private static final Method VALUE_ELEMENT_METHOD = initValueElementMethod(); |
jfranck@1491 | 266 | |
jjg@1492 | 267 | private static Class<? extends Annotation> initRepeatable() { |
jfranck@1491 | 268 | try { |
darcy@1501 | 269 | // Repeatable will not be available when bootstrapping on |
darcy@1501 | 270 | // JDK 7 so use a reflective lookup instead of a class |
darcy@1501 | 271 | // literal for Repeatable.class. |
darcy@1501 | 272 | return Class.forName("java.lang.annotation.Repeatable").asSubclass(Annotation.class); |
jfranck@1491 | 273 | } catch (ClassNotFoundException e) { |
jfranck@1491 | 274 | return null; |
jfranck@1491 | 275 | } catch (SecurityException e) { |
jfranck@1491 | 276 | return null; |
jfranck@1491 | 277 | } |
jfranck@1491 | 278 | } |
jfranck@1491 | 279 | private static Method initValueElementMethod() { |
jjg@1492 | 280 | if (REPEATABLE_CLASS == null) |
jfranck@1491 | 281 | return null; |
jfranck@1491 | 282 | |
jfranck@1491 | 283 | Method m = null; |
jfranck@1491 | 284 | try { |
jjg@1492 | 285 | m = REPEATABLE_CLASS.getMethod("value"); |
jfranck@1491 | 286 | if (m != null) |
jfranck@1491 | 287 | m.setAccessible(true); |
jfranck@1491 | 288 | return m; |
jfranck@1491 | 289 | } catch (NoSuchMethodException e) { |
jfranck@1491 | 290 | return null; |
jfranck@1491 | 291 | } |
jfranck@1491 | 292 | } |
jfranck@1491 | 293 | |
jfranck@1491 | 294 | // Helper to getAnnotations |
jfranck@1491 | 295 | private static Class<? extends Annotation> getContainer(Class<? extends Annotation> annoType) { |
jjg@1492 | 296 | // Since we can not refer to java.lang.annotation.Repeatable until we are |
jjg@1492 | 297 | // bootstrapping with java 8 we need to get the Repeatable annotation using |
jfranck@1491 | 298 | // reflective invocations instead of just using its type and element method. |
jjg@1492 | 299 | if (REPEATABLE_CLASS != null && |
jfranck@1491 | 300 | VALUE_ELEMENT_METHOD != null) { |
jjg@1492 | 301 | // Get the Repeatable instance on the annotations declaration |
jjg@1492 | 302 | Annotation repeatable = (Annotation)annoType.getAnnotation(REPEATABLE_CLASS); |
jjg@1492 | 303 | if (repeatable != null) { |
jfranck@1491 | 304 | try { |
jfranck@1491 | 305 | // Get the value element, it should be a class |
jfranck@1491 | 306 | // indicating the containing annotation type |
jfranck@1491 | 307 | @SuppressWarnings("unchecked") |
jjg@1492 | 308 | Class<? extends Annotation> containerType = (Class)VALUE_ELEMENT_METHOD.invoke(repeatable); |
jfranck@1491 | 309 | if (containerType == null) |
jfranck@1491 | 310 | return null; |
jfranck@1491 | 311 | |
jfranck@1491 | 312 | return containerType; |
jfranck@1491 | 313 | } catch (ClassCastException e) { |
jfranck@1491 | 314 | return null; |
jfranck@1491 | 315 | } catch (IllegalAccessException e) { |
jfranck@1491 | 316 | return null; |
jfranck@1491 | 317 | } catch (InvocationTargetException e ) { |
jfranck@1491 | 318 | return null; |
jfranck@1491 | 319 | } |
jfranck@1491 | 320 | } |
jfranck@1491 | 321 | } |
jfranck@1491 | 322 | return null; |
jfranck@1491 | 323 | } |
jfranck@1491 | 324 | // Helper to getAnnotations |
jfranck@1491 | 325 | private static Attribute[] unpackAttributes(Attribute.Compound container) { |
jfranck@1491 | 326 | // We now have an instance of the container, |
jfranck@1491 | 327 | // unpack it returning an instance of the |
jfranck@1491 | 328 | // contained type or null |
jfranck@1491 | 329 | return ((Attribute.Array)container.member(container.type.tsym.name.table.names.value)).values; |
jfranck@1491 | 330 | } |
duke@1 | 331 | |
duke@1 | 332 | public PackageSymbol getPackageElement(CharSequence name) { |
duke@1 | 333 | String strName = name.toString(); |
duke@1 | 334 | if (strName.equals("")) |
duke@1 | 335 | return syms.unnamedPackage; |
duke@1 | 336 | return SourceVersion.isName(strName) |
duke@1 | 337 | ? nameToSymbol(strName, PackageSymbol.class) |
duke@1 | 338 | : null; |
duke@1 | 339 | } |
duke@1 | 340 | |
duke@1 | 341 | public ClassSymbol getTypeElement(CharSequence name) { |
duke@1 | 342 | String strName = name.toString(); |
duke@1 | 343 | return SourceVersion.isName(strName) |
duke@1 | 344 | ? nameToSymbol(strName, ClassSymbol.class) |
duke@1 | 345 | : null; |
duke@1 | 346 | } |
duke@1 | 347 | |
duke@1 | 348 | /** |
duke@1 | 349 | * Returns a symbol given the type's or packages's canonical name, |
duke@1 | 350 | * or null if the name isn't found. |
duke@1 | 351 | */ |
duke@1 | 352 | private <S extends Symbol> S nameToSymbol(String nameStr, Class<S> clazz) { |
duke@1 | 353 | Name name = names.fromString(nameStr); |
duke@1 | 354 | // First check cache. |
duke@1 | 355 | Symbol sym = (clazz == ClassSymbol.class) |
duke@1 | 356 | ? syms.classes.get(name) |
duke@1 | 357 | : syms.packages.get(name); |
duke@1 | 358 | |
duke@1 | 359 | try { |
duke@1 | 360 | if (sym == null) |
duke@1 | 361 | sym = javaCompiler.resolveIdent(nameStr); |
duke@1 | 362 | |
duke@1 | 363 | sym.complete(); |
duke@1 | 364 | |
duke@1 | 365 | return (sym.kind != Kinds.ERR && |
duke@1 | 366 | sym.exists() && |
duke@1 | 367 | clazz.isInstance(sym) && |
duke@1 | 368 | name.equals(sym.getQualifiedName())) |
duke@1 | 369 | ? clazz.cast(sym) |
duke@1 | 370 | : null; |
duke@1 | 371 | } catch (CompletionFailure e) { |
duke@1 | 372 | return null; |
duke@1 | 373 | } |
duke@1 | 374 | } |
duke@1 | 375 | |
duke@1 | 376 | public JavacSourcePosition getSourcePosition(Element e) { |
duke@1 | 377 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
duke@1 | 378 | if (treeTop == null) |
duke@1 | 379 | return null; |
duke@1 | 380 | JCTree tree = treeTop.fst; |
duke@1 | 381 | JCCompilationUnit toplevel = treeTop.snd; |
duke@1 | 382 | JavaFileObject sourcefile = toplevel.sourcefile; |
duke@1 | 383 | if (sourcefile == null) |
duke@1 | 384 | return null; |
duke@1 | 385 | return new JavacSourcePosition(sourcefile, tree.pos, toplevel.lineMap); |
duke@1 | 386 | } |
duke@1 | 387 | |
duke@1 | 388 | public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a) { |
duke@1 | 389 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
duke@1 | 390 | if (treeTop == null) |
duke@1 | 391 | return null; |
duke@1 | 392 | JCTree tree = treeTop.fst; |
duke@1 | 393 | JCCompilationUnit toplevel = treeTop.snd; |
duke@1 | 394 | JavaFileObject sourcefile = toplevel.sourcefile; |
duke@1 | 395 | if (sourcefile == null) |
duke@1 | 396 | return null; |
duke@1 | 397 | |
duke@1 | 398 | JCTree annoTree = matchAnnoToTree(a, e, tree); |
duke@1 | 399 | if (annoTree == null) |
duke@1 | 400 | return null; |
duke@1 | 401 | return new JavacSourcePosition(sourcefile, annoTree.pos, |
duke@1 | 402 | toplevel.lineMap); |
duke@1 | 403 | } |
duke@1 | 404 | |
duke@1 | 405 | public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a, |
duke@1 | 406 | AnnotationValue v) { |
duke@1 | 407 | // TODO: better accuracy in getSourcePosition(... AnnotationValue) |
duke@1 | 408 | return getSourcePosition(e, a); |
duke@1 | 409 | } |
duke@1 | 410 | |
duke@1 | 411 | /** |
duke@1 | 412 | * Returns the tree for an annotation given the annotated element |
duke@1 | 413 | * and the element's own tree. Returns null if the tree cannot be found. |
duke@1 | 414 | */ |
duke@1 | 415 | private JCTree matchAnnoToTree(AnnotationMirror findme, |
duke@1 | 416 | Element e, JCTree tree) { |
duke@1 | 417 | Symbol sym = cast(Symbol.class, e); |
duke@1 | 418 | class Vis extends JCTree.Visitor { |
duke@1 | 419 | List<JCAnnotation> result = null; |
duke@1 | 420 | public void visitTopLevel(JCCompilationUnit tree) { |
duke@1 | 421 | result = tree.packageAnnotations; |
duke@1 | 422 | } |
duke@1 | 423 | public void visitClassDef(JCClassDecl tree) { |
duke@1 | 424 | result = tree.mods.annotations; |
duke@1 | 425 | } |
duke@1 | 426 | public void visitMethodDef(JCMethodDecl tree) { |
duke@1 | 427 | result = tree.mods.annotations; |
duke@1 | 428 | } |
duke@1 | 429 | public void visitVarDef(JCVariableDecl tree) { |
duke@1 | 430 | result = tree.mods.annotations; |
duke@1 | 431 | } |
duke@1 | 432 | } |
duke@1 | 433 | Vis vis = new Vis(); |
duke@1 | 434 | tree.accept(vis); |
duke@1 | 435 | if (vis.result == null) |
duke@1 | 436 | return null; |
jfranck@1491 | 437 | |
jfranck@1491 | 438 | List<Attribute.Compound> annos = sym.getRawAttributes(); |
duke@1 | 439 | return matchAnnoToTree(cast(Attribute.Compound.class, findme), |
jfranck@1491 | 440 | annos, |
duke@1 | 441 | vis.result); |
duke@1 | 442 | } |
duke@1 | 443 | |
duke@1 | 444 | /** |
duke@1 | 445 | * Returns the tree for an annotation given a list of annotations |
duke@1 | 446 | * in which to search (recursively) and their corresponding trees. |
duke@1 | 447 | * Returns null if the tree cannot be found. |
duke@1 | 448 | */ |
duke@1 | 449 | private JCTree matchAnnoToTree(Attribute.Compound findme, |
duke@1 | 450 | List<Attribute.Compound> annos, |
duke@1 | 451 | List<JCAnnotation> trees) { |
duke@1 | 452 | for (Attribute.Compound anno : annos) { |
duke@1 | 453 | for (JCAnnotation tree : trees) { |
duke@1 | 454 | JCTree match = matchAnnoToTree(findme, anno, tree); |
duke@1 | 455 | if (match != null) |
duke@1 | 456 | return match; |
duke@1 | 457 | } |
duke@1 | 458 | } |
duke@1 | 459 | return null; |
duke@1 | 460 | } |
duke@1 | 461 | |
duke@1 | 462 | /** |
duke@1 | 463 | * Returns the tree for an annotation given an Attribute to |
duke@1 | 464 | * search (recursively) and its corresponding tree. |
duke@1 | 465 | * Returns null if the tree cannot be found. |
duke@1 | 466 | */ |
duke@1 | 467 | private JCTree matchAnnoToTree(final Attribute.Compound findme, |
duke@1 | 468 | final Attribute attr, |
duke@1 | 469 | final JCTree tree) { |
duke@1 | 470 | if (attr == findme) |
duke@1 | 471 | return (tree.type.tsym == findme.type.tsym) ? tree : null; |
duke@1 | 472 | |
duke@1 | 473 | class Vis implements Attribute.Visitor { |
duke@1 | 474 | JCTree result = null; |
duke@1 | 475 | public void visitConstant(Attribute.Constant value) { |
duke@1 | 476 | } |
duke@1 | 477 | public void visitClass(Attribute.Class clazz) { |
duke@1 | 478 | } |
duke@1 | 479 | public void visitCompound(Attribute.Compound anno) { |
duke@1 | 480 | for (Pair<MethodSymbol, Attribute> pair : anno.values) { |
duke@1 | 481 | JCExpression expr = scanForAssign(pair.fst, tree); |
duke@1 | 482 | if (expr != null) { |
duke@1 | 483 | JCTree match = matchAnnoToTree(findme, pair.snd, expr); |
duke@1 | 484 | if (match != null) { |
duke@1 | 485 | result = match; |
duke@1 | 486 | return; |
duke@1 | 487 | } |
duke@1 | 488 | } |
duke@1 | 489 | } |
duke@1 | 490 | } |
duke@1 | 491 | public void visitArray(Attribute.Array array) { |
jjg@1127 | 492 | if (tree.hasTag(NEWARRAY) && |
duke@1 | 493 | types.elemtype(array.type).tsym == findme.type.tsym) { |
duke@1 | 494 | List<JCExpression> elems = ((JCNewArray) tree).elems; |
duke@1 | 495 | for (Attribute value : array.values) { |
duke@1 | 496 | if (value == findme) { |
duke@1 | 497 | result = elems.head; |
duke@1 | 498 | return; |
duke@1 | 499 | } |
duke@1 | 500 | elems = elems.tail; |
duke@1 | 501 | } |
duke@1 | 502 | } |
duke@1 | 503 | } |
duke@1 | 504 | public void visitEnum(Attribute.Enum e) { |
duke@1 | 505 | } |
duke@1 | 506 | public void visitError(Attribute.Error e) { |
duke@1 | 507 | } |
duke@1 | 508 | } |
duke@1 | 509 | Vis vis = new Vis(); |
duke@1 | 510 | attr.accept(vis); |
duke@1 | 511 | return vis.result; |
duke@1 | 512 | } |
duke@1 | 513 | |
duke@1 | 514 | /** |
duke@1 | 515 | * Scans for a JCAssign node with a LHS matching a given |
duke@1 | 516 | * symbol, and returns its RHS. Does not scan nested JCAnnotations. |
duke@1 | 517 | */ |
duke@1 | 518 | private JCExpression scanForAssign(final MethodSymbol sym, |
duke@1 | 519 | final JCTree tree) { |
duke@1 | 520 | class TS extends TreeScanner { |
duke@1 | 521 | JCExpression result = null; |
duke@1 | 522 | public void scan(JCTree t) { |
duke@1 | 523 | if (t != null && result == null) |
duke@1 | 524 | t.accept(this); |
duke@1 | 525 | } |
duke@1 | 526 | public void visitAnnotation(JCAnnotation t) { |
duke@1 | 527 | if (t == tree) |
duke@1 | 528 | scan(t.args); |
duke@1 | 529 | } |
duke@1 | 530 | public void visitAssign(JCAssign t) { |
jjg@1127 | 531 | if (t.lhs.hasTag(IDENT)) { |
duke@1 | 532 | JCIdent ident = (JCIdent) t.lhs; |
duke@1 | 533 | if (ident.sym == sym) |
duke@1 | 534 | result = t.rhs; |
duke@1 | 535 | } |
duke@1 | 536 | } |
duke@1 | 537 | } |
duke@1 | 538 | TS scanner = new TS(); |
duke@1 | 539 | tree.accept(scanner); |
duke@1 | 540 | return scanner.result; |
duke@1 | 541 | } |
duke@1 | 542 | |
duke@1 | 543 | /** |
duke@1 | 544 | * Returns the tree node corresponding to this element, or null |
duke@1 | 545 | * if none can be found. |
duke@1 | 546 | */ |
duke@1 | 547 | public JCTree getTree(Element e) { |
duke@1 | 548 | Pair<JCTree, ?> treeTop = getTreeAndTopLevel(e); |
duke@1 | 549 | return (treeTop != null) ? treeTop.fst : null; |
duke@1 | 550 | } |
duke@1 | 551 | |
duke@1 | 552 | public String getDocComment(Element e) { |
duke@1 | 553 | // Our doc comment is contained in a map in our toplevel, |
duke@1 | 554 | // indexed by our tree. Find our enter environment, which gives |
duke@1 | 555 | // us our toplevel. It also gives us a tree that contains our |
duke@1 | 556 | // tree: walk it to find our tree. This is painful. |
duke@1 | 557 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
duke@1 | 558 | if (treeTop == null) |
duke@1 | 559 | return null; |
duke@1 | 560 | JCTree tree = treeTop.fst; |
duke@1 | 561 | JCCompilationUnit toplevel = treeTop.snd; |
duke@1 | 562 | if (toplevel.docComments == null) |
duke@1 | 563 | return null; |
jjg@1280 | 564 | return toplevel.docComments.getCommentText(tree); |
duke@1 | 565 | } |
duke@1 | 566 | |
duke@1 | 567 | public PackageElement getPackageOf(Element e) { |
duke@1 | 568 | return cast(Symbol.class, e).packge(); |
duke@1 | 569 | } |
duke@1 | 570 | |
duke@1 | 571 | public boolean isDeprecated(Element e) { |
duke@1 | 572 | Symbol sym = cast(Symbol.class, e); |
duke@1 | 573 | return (sym.flags() & Flags.DEPRECATED) != 0; |
duke@1 | 574 | } |
duke@1 | 575 | |
duke@1 | 576 | public Name getBinaryName(TypeElement type) { |
duke@1 | 577 | return cast(TypeSymbol.class, type).flatName(); |
duke@1 | 578 | } |
duke@1 | 579 | |
duke@1 | 580 | public Map<MethodSymbol, Attribute> getElementValuesWithDefaults( |
duke@1 | 581 | AnnotationMirror a) { |
duke@1 | 582 | Attribute.Compound anno = cast(Attribute.Compound.class, a); |
duke@1 | 583 | DeclaredType annotype = a.getAnnotationType(); |
duke@1 | 584 | Map<MethodSymbol, Attribute> valmap = anno.getElementValues(); |
duke@1 | 585 | |
duke@1 | 586 | for (ExecutableElement ex : |
duke@1 | 587 | methodsIn(annotype.asElement().getEnclosedElements())) { |
duke@1 | 588 | MethodSymbol meth = (MethodSymbol) ex; |
duke@1 | 589 | Attribute defaultValue = meth.getDefaultValue(); |
duke@1 | 590 | if (defaultValue != null && !valmap.containsKey(meth)) { |
duke@1 | 591 | valmap.put(meth, defaultValue); |
duke@1 | 592 | } |
duke@1 | 593 | } |
duke@1 | 594 | return valmap; |
duke@1 | 595 | } |
duke@1 | 596 | |
duke@1 | 597 | /** |
duke@1 | 598 | * {@inheritDoc} |
duke@1 | 599 | */ |
duke@1 | 600 | public FilteredMemberList getAllMembers(TypeElement element) { |
duke@1 | 601 | Symbol sym = cast(Symbol.class, element); |
duke@1 | 602 | Scope scope = sym.members().dupUnshared(); |
duke@1 | 603 | List<Type> closure = types.closure(sym.asType()); |
duke@1 | 604 | for (Type t : closure) |
duke@1 | 605 | addMembers(scope, t); |
duke@1 | 606 | return new FilteredMemberList(scope); |
duke@1 | 607 | } |
duke@1 | 608 | // where |
duke@1 | 609 | private void addMembers(Scope scope, Type type) { |
duke@1 | 610 | members: |
duke@1 | 611 | for (Scope.Entry e = type.asElement().members().elems; e != null; e = e.sibling) { |
duke@1 | 612 | Scope.Entry overrider = scope.lookup(e.sym.getSimpleName()); |
duke@1 | 613 | while (overrider.scope != null) { |
duke@1 | 614 | if (overrider.sym.kind == e.sym.kind |
duke@1 | 615 | && (overrider.sym.flags() & Flags.SYNTHETIC) == 0) |
duke@1 | 616 | { |
duke@1 | 617 | if (overrider.sym.getKind() == ElementKind.METHOD |
duke@1 | 618 | && overrides((ExecutableElement)overrider.sym, (ExecutableElement)e.sym, (TypeElement)type.asElement())) { |
duke@1 | 619 | continue members; |
duke@1 | 620 | } |
duke@1 | 621 | } |
duke@1 | 622 | overrider = overrider.next(); |
duke@1 | 623 | } |
duke@1 | 624 | boolean derived = e.sym.getEnclosingElement() != scope.owner; |
duke@1 | 625 | ElementKind kind = e.sym.getKind(); |
duke@1 | 626 | boolean initializer = kind == ElementKind.CONSTRUCTOR |
duke@1 | 627 | || kind == ElementKind.INSTANCE_INIT |
duke@1 | 628 | || kind == ElementKind.STATIC_INIT; |
duke@1 | 629 | if (!derived || (!initializer && e.sym.isInheritedIn(scope.owner, types))) |
duke@1 | 630 | scope.enter(e.sym); |
duke@1 | 631 | } |
duke@1 | 632 | } |
duke@1 | 633 | |
duke@1 | 634 | /** |
duke@1 | 635 | * Returns all annotations of an element, whether |
duke@1 | 636 | * inherited or directly present. |
duke@1 | 637 | * |
duke@1 | 638 | * @param e the element being examined |
duke@1 | 639 | * @return all annotations of the element |
duke@1 | 640 | */ |
duke@1 | 641 | public List<Attribute.Compound> getAllAnnotationMirrors(Element e) { |
duke@1 | 642 | Symbol sym = cast(Symbol.class, e); |
jfranck@1491 | 643 | List<Attribute.Compound> annos = sym.getRawAttributes(); |
duke@1 | 644 | while (sym.getKind() == ElementKind.CLASS) { |
duke@1 | 645 | Type sup = ((ClassSymbol) sym).getSuperclass(); |
jjg@1374 | 646 | if (!sup.hasTag(CLASS) || sup.isErroneous() || |
duke@1 | 647 | sup.tsym == syms.objectType.tsym) { |
duke@1 | 648 | break; |
duke@1 | 649 | } |
duke@1 | 650 | sym = sup.tsym; |
duke@1 | 651 | List<Attribute.Compound> oldAnnos = annos; |
jfranck@1491 | 652 | List<Attribute.Compound> newAnnos = sym.getRawAttributes(); |
jfranck@1491 | 653 | for (Attribute.Compound anno : newAnnos) { |
duke@1 | 654 | if (isInherited(anno.type) && |
duke@1 | 655 | !containsAnnoOfType(oldAnnos, anno.type)) { |
duke@1 | 656 | annos = annos.prepend(anno); |
duke@1 | 657 | } |
duke@1 | 658 | } |
duke@1 | 659 | } |
duke@1 | 660 | return annos; |
duke@1 | 661 | } |
duke@1 | 662 | |
duke@1 | 663 | /** |
duke@1 | 664 | * Tests whether an annotation type is @Inherited. |
duke@1 | 665 | */ |
duke@1 | 666 | private boolean isInherited(Type annotype) { |
jfranck@1491 | 667 | return annotype.tsym.attribute(syms.inheritedType.tsym) != null; |
duke@1 | 668 | } |
duke@1 | 669 | |
duke@1 | 670 | /** |
duke@1 | 671 | * Tests whether a list of annotations contains an annotation |
duke@1 | 672 | * of a given type. |
duke@1 | 673 | */ |
duke@1 | 674 | private static boolean containsAnnoOfType(List<Attribute.Compound> annos, |
duke@1 | 675 | Type type) { |
duke@1 | 676 | for (Attribute.Compound anno : annos) { |
duke@1 | 677 | if (anno.type.tsym == type.tsym) |
duke@1 | 678 | return true; |
duke@1 | 679 | } |
duke@1 | 680 | return false; |
duke@1 | 681 | } |
duke@1 | 682 | |
duke@1 | 683 | public boolean hides(Element hiderEl, Element hideeEl) { |
duke@1 | 684 | Symbol hider = cast(Symbol.class, hiderEl); |
duke@1 | 685 | Symbol hidee = cast(Symbol.class, hideeEl); |
duke@1 | 686 | |
duke@1 | 687 | // Fields only hide fields; methods only methods; types only types. |
duke@1 | 688 | // Names must match. Nothing hides itself (just try it). |
duke@1 | 689 | if (hider == hidee || |
duke@1 | 690 | hider.kind != hidee.kind || |
duke@1 | 691 | hider.name != hidee.name) { |
duke@1 | 692 | return false; |
duke@1 | 693 | } |
duke@1 | 694 | |
duke@1 | 695 | // Only static methods can hide other methods. |
duke@1 | 696 | // Methods only hide methods with matching signatures. |
duke@1 | 697 | if (hider.kind == Kinds.MTH) { |
duke@1 | 698 | if (!hider.isStatic() || |
duke@1 | 699 | !types.isSubSignature(hider.type, hidee.type)) { |
duke@1 | 700 | return false; |
duke@1 | 701 | } |
duke@1 | 702 | } |
duke@1 | 703 | |
duke@1 | 704 | // Hider must be in a subclass of hidee's class. |
duke@1 | 705 | // Note that if M1 hides M2, and M2 hides M3, and M3 is accessible |
duke@1 | 706 | // in M1's class, then M1 and M2 both hide M3. |
duke@1 | 707 | ClassSymbol hiderClass = hider.owner.enclClass(); |
duke@1 | 708 | ClassSymbol hideeClass = hidee.owner.enclClass(); |
duke@1 | 709 | if (hiderClass == null || hideeClass == null || |
duke@1 | 710 | !hiderClass.isSubClass(hideeClass, types)) { |
duke@1 | 711 | return false; |
duke@1 | 712 | } |
duke@1 | 713 | |
duke@1 | 714 | // Hidee must be accessible in hider's class. |
duke@1 | 715 | // The method isInheritedIn is poorly named: it checks only access. |
duke@1 | 716 | return hidee.isInheritedIn(hiderClass, types); |
duke@1 | 717 | } |
duke@1 | 718 | |
duke@1 | 719 | public boolean overrides(ExecutableElement riderEl, |
duke@1 | 720 | ExecutableElement rideeEl, TypeElement typeEl) { |
duke@1 | 721 | MethodSymbol rider = cast(MethodSymbol.class, riderEl); |
duke@1 | 722 | MethodSymbol ridee = cast(MethodSymbol.class, rideeEl); |
duke@1 | 723 | ClassSymbol origin = cast(ClassSymbol.class, typeEl); |
duke@1 | 724 | |
duke@1 | 725 | return rider.name == ridee.name && |
duke@1 | 726 | |
duke@1 | 727 | // not reflexive as per JLS |
duke@1 | 728 | rider != ridee && |
duke@1 | 729 | |
duke@1 | 730 | // we don't care if ridee is static, though that wouldn't |
duke@1 | 731 | // compile |
duke@1 | 732 | !rider.isStatic() && |
duke@1 | 733 | |
duke@1 | 734 | // Symbol.overrides assumes the following |
duke@1 | 735 | ridee.isMemberOf(origin, types) && |
duke@1 | 736 | |
duke@1 | 737 | // check access and signatures; don't check return types |
duke@1 | 738 | rider.overrides(ridee, origin, types, false); |
duke@1 | 739 | } |
duke@1 | 740 | |
duke@1 | 741 | public String getConstantExpression(Object value) { |
duke@1 | 742 | return Constants.format(value); |
duke@1 | 743 | } |
duke@1 | 744 | |
duke@1 | 745 | /** |
duke@1 | 746 | * Print a representation of the elements to the given writer in |
duke@1 | 747 | * the specified order. The main purpose of this method is for |
duke@1 | 748 | * diagnostics. The exact format of the output is <em>not</em> |
duke@1 | 749 | * specified and is subject to change. |
duke@1 | 750 | * |
duke@1 | 751 | * @param w the writer to print the output to |
duke@1 | 752 | * @param elements the elements to print |
duke@1 | 753 | */ |
duke@1 | 754 | public void printElements(java.io.Writer w, Element... elements) { |
duke@1 | 755 | for (Element element : elements) |
duke@1 | 756 | (new PrintingProcessor.PrintingElementVisitor(w, this)).visit(element).flush(); |
duke@1 | 757 | } |
duke@1 | 758 | |
duke@1 | 759 | public Name getName(CharSequence cs) { |
jjg@113 | 760 | return names.fromString(cs.toString()); |
duke@1 | 761 | } |
duke@1 | 762 | |
duke@1 | 763 | /** |
duke@1 | 764 | * Returns the tree node and compilation unit corresponding to this |
duke@1 | 765 | * element, or null if they can't be found. |
duke@1 | 766 | */ |
duke@1 | 767 | private Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel(Element e) { |
duke@1 | 768 | Symbol sym = cast(Symbol.class, e); |
duke@1 | 769 | Env<AttrContext> enterEnv = getEnterEnv(sym); |
duke@1 | 770 | if (enterEnv == null) |
duke@1 | 771 | return null; |
duke@1 | 772 | JCTree tree = TreeInfo.declarationFor(sym, enterEnv.tree); |
duke@1 | 773 | if (tree == null || enterEnv.toplevel == null) |
duke@1 | 774 | return null; |
duke@1 | 775 | return new Pair<JCTree,JCCompilationUnit>(tree, enterEnv.toplevel); |
duke@1 | 776 | } |
duke@1 | 777 | |
duke@1 | 778 | /** |
duke@1 | 779 | * Returns the best approximation for the tree node and compilation unit |
duke@1 | 780 | * corresponding to the given element, annotation and value. |
duke@1 | 781 | * If the element is null, null is returned. |
duke@1 | 782 | * If the annotation is null or cannot be found, the tree node and |
duke@1 | 783 | * compilation unit for the element is returned. |
duke@1 | 784 | * If the annotation value is null or cannot be found, the tree node and |
duke@1 | 785 | * compilation unit for the annotation is returned. |
duke@1 | 786 | */ |
duke@1 | 787 | public Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel( |
duke@1 | 788 | Element e, AnnotationMirror a, AnnotationValue v) { |
duke@1 | 789 | if (e == null) |
duke@1 | 790 | return null; |
duke@1 | 791 | |
duke@1 | 792 | Pair<JCTree, JCCompilationUnit> elemTreeTop = getTreeAndTopLevel(e); |
duke@1 | 793 | if (elemTreeTop == null) |
duke@1 | 794 | return null; |
duke@1 | 795 | |
duke@1 | 796 | if (a == null) |
duke@1 | 797 | return elemTreeTop; |
duke@1 | 798 | |
duke@1 | 799 | JCTree annoTree = matchAnnoToTree(a, e, elemTreeTop.fst); |
duke@1 | 800 | if (annoTree == null) |
duke@1 | 801 | return elemTreeTop; |
duke@1 | 802 | |
duke@1 | 803 | // 6388543: if v != null, we should search within annoTree to find |
duke@1 | 804 | // the tree matching v. For now, we ignore v and return the tree of |
duke@1 | 805 | // the annotation. |
duke@1 | 806 | return new Pair<JCTree, JCCompilationUnit>(annoTree, elemTreeTop.snd); |
duke@1 | 807 | } |
duke@1 | 808 | |
duke@1 | 809 | /** |
duke@1 | 810 | * Returns a symbol's enter environment, or null if it has none. |
duke@1 | 811 | */ |
duke@1 | 812 | private Env<AttrContext> getEnterEnv(Symbol sym) { |
duke@1 | 813 | // Get enclosing class of sym, or sym itself if it is a class |
duke@1 | 814 | // or package. |
duke@1 | 815 | TypeSymbol ts = (sym.kind != Kinds.PCK) |
duke@1 | 816 | ? sym.enclClass() |
duke@1 | 817 | : (PackageSymbol) sym; |
duke@1 | 818 | return (ts != null) |
duke@1 | 819 | ? enter.getEnv(ts) |
duke@1 | 820 | : null; |
duke@1 | 821 | } |
duke@1 | 822 | |
duke@1 | 823 | /** |
duke@1 | 824 | * Returns an object cast to the specified type. |
duke@1 | 825 | * @throws NullPointerException if the object is {@code null} |
duke@1 | 826 | * @throws IllegalArgumentException if the object is of the wrong type |
duke@1 | 827 | */ |
duke@1 | 828 | private static <T> T cast(Class<T> clazz, Object o) { |
duke@1 | 829 | if (! clazz.isInstance(o)) |
duke@1 | 830 | throw new IllegalArgumentException(o.toString()); |
duke@1 | 831 | return clazz.cast(o); |
duke@1 | 832 | } |
duke@1 | 833 | } |