/* * Copyright (C) 2009-2014 The Project Lombok Authors. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package lombok.javac.handlers; import static lombok.javac.handlers.JavacHandlerUtil.*; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import lombok.SneakyThrows; import lombok.core.AnnotationValues; import lombok.core.HandlerPriority; import lombok.javac.JavacAnnotationHandler; import lombok.javac.JavacNode; import lombok.javac.JavacTreeMaker; import org.mangosdk.spi.ProviderFor; import com.sun.tools.javac.code.Flags; import com.sun.tools.javac.tree.JCTree; import com.sun.tools.javac.tree.JCTree.JCAnnotation; import com.sun.tools.javac.tree.JCTree.JCBlock; import com.sun.tools.javac.tree.JCTree.JCExpression; import com.sun.tools.javac.tree.JCTree.JCMethodDecl; import com.sun.tools.javac.tree.JCTree.JCStatement; import com.sun.tools.javac.tree.JCTree.JCVariableDecl; import com.sun.tools.javac.util.Context; import com.sun.tools.javac.util.List; /** * Handles the {@code lombok.SneakyThrows} annotation for javac. */ @ProviderFor(JavacAnnotationHandler.class) @HandlerPriority(value = 1024) // 2^10; @NonNull must have run first, so that we wrap around the statements generated by it. public class HandleSneakyThrows extends JavacAnnotationHandler { @Override public void handle(AnnotationValues annotation, JCAnnotation ast, JavacNode annotationNode) { deleteAnnotationIfNeccessary(annotationNode, SneakyThrows.class); Collection exceptionNames = annotation.getRawExpressions("value"); if (exceptionNames.isEmpty()) { exceptionNames = Collections.singleton("java.lang.Throwable"); } java.util.List exceptions = new ArrayList(); for (String exception : exceptionNames) { if (exception.endsWith(".class")) exception = exception.substring(0, exception.length() - 6); exceptions.add(exception); } JavacNode owner = annotationNode.up(); switch (owner.getKind()) { case METHOD: handleMethod(annotationNode, (JCMethodDecl)owner.get(), exceptions); break; default: annotationNode.addError("@SneakyThrows is legal only on methods and constructors."); break; } } public void handleMethod(JavacNode annotation, JCMethodDecl method, Collection exceptions) { JavacNode methodNode = annotation.up(); if ( (method.mods.flags & Flags.ABSTRACT) != 0) { annotation.addError("@SneakyThrows can only be used on concrete methods."); return; } if (method.body == null || method.body.stats.isEmpty()) { generateEmptyBlockWarning(methodNode, annotation, false); return; } final JCStatement constructorCall = method.body.stats.get(0); final boolean isConstructorCall = isConstructorCall(constructorCall); List contents = isConstructorCall ? method.body.stats.tail : method.body.stats; if (contents == null || contents.isEmpty()) { generateEmptyBlockWarning(methodNode, annotation, true); return; } for (String exception : exceptions) { contents = List.of(buildTryCatchBlock(methodNode, contents, exception, annotation.get())); } method.body.stats = isConstructorCall ? List.of(constructorCall).appendList(contents) : contents; methodNode.rebuild(); } public void generateEmptyBlockWarning(JavacNode methodNode, JavacNode annotation, boolean hasConstructorCall) { if (hasConstructorCall) { annotation.addWarning("Calls to sibling / super constructors are always excluded from @SneakyThrows; @SneakyThrows has been ignored because there is no other code in this constructor."); } else { annotation.addWarning("This method or constructor is empty; @SneakyThrows has been ignored."); } } public JCStatement buildTryCatchBlock(JavacNode node, List contents, String exception, JCTree source) { JavacTreeMaker maker = node.getTreeMaker(); Context context = node.getContext(); JCBlock tryBlock = setGeneratedBy(maker.Block(0, contents), source, context); JCExpression varType = chainDots(node, exception.split("\\.")); JCVariableDecl catchParam = maker.VarDef(maker.Modifiers(Flags.FINAL), node.toName("$ex"), varType, null); JCExpression lombokLombokSneakyThrowNameRef = chainDots(node, "lombok", "Lombok", "sneakyThrow"); JCBlock catchBody = maker.Block(0, List.of(maker.Throw(maker.Apply( List.nil(), lombokLombokSneakyThrowNameRef, List.of(maker.Ident(node.toName("$ex"))))))); return setGeneratedBy(maker.Try(tryBlock, List.of(recursiveSetGeneratedBy(maker.Catch(catchParam, catchBody), source, context)), null), source, context); } }