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/*
* Copyright (C) 2009-2013 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<SneakyThrows> {
@Override public void handle(AnnotationValues<SneakyThrows> annotation, JCAnnotation ast, JavacNode annotationNode) {
deleteAnnotationIfNeccessary(annotationNode, SneakyThrows.class);
Collection<String> exceptionNames = annotation.getRawExpressions("value");
if (exceptionNames.isEmpty()) {
exceptionNames = Collections.singleton("java.lang.Throwable");
}
java.util.List<String> exceptions = new ArrayList<String>();
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;
}
}
private void handleMethod(JavacNode annotation, JCMethodDecl method, Collection<String> 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<JCStatement> 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();
}
private 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.");
}
}
private JCStatement buildTryCatchBlock(JavacNode node, List<JCStatement> 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("$ex"), varType, null);
JCExpression lombokLombokSneakyThrowNameRef = chainDots(node, "lombok", "Lombok", "sneakyThrow");
JCBlock catchBody = maker.Block(0, List.<JCStatement>of(maker.Throw(maker.Apply(
List.<JCExpression>nil(), lombokLombokSneakyThrowNameRef,
List.<JCExpression>of(maker.Ident(node.toName("$ex")))))));
return setGeneratedBy(maker.Try(tryBlock, List.of(recursiveSetGeneratedBy(maker.Catch(catchParam, catchBody), source, context)), null), source, context);
}
}
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