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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* 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 org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.code.TypeTags;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCNewArray;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import lombok.Synchronized;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
/**
* Handles the {@code lombok.Synchronized} annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
public class HandleSynchronized implements JavacAnnotationHandler<Synchronized> {
private static final String INSTANCE_LOCK_NAME = "$lock";
private static final String STATIC_LOCK_NAME = "$LOCK";
@Override public boolean handle(AnnotationValues<Synchronized> annotation, JCAnnotation ast, JavacNode annotationNode) {
JavacNode methodNode = annotationNode.up();
if (methodNode == null || methodNode.getKind() != Kind.METHOD || !(methodNode.get() instanceof JCMethodDecl)) {
annotationNode.addError("@Synchronized is legal only on methods.");
return true;
}
JCMethodDecl method = (JCMethodDecl)methodNode.get();
if ((method.mods.flags & Flags.ABSTRACT) != 0) {
annotationNode.addError("@Synchronized is legal only on concrete methods.");
return true;
}
boolean isStatic = (method.mods.flags & Flags.STATIC) != 0;
String lockName = annotation.getInstance().value();
boolean autoMake = false;
if (lockName.length() == 0) {
autoMake = true;
lockName = isStatic ? STATIC_LOCK_NAME : INSTANCE_LOCK_NAME;
}
TreeMaker maker = methodNode.getTreeMaker();
if (fieldExists(lockName, methodNode) == MemberExistsResult.NOT_EXISTS) {
if (!autoMake) {
annotationNode.addError("The field " + lockName + " does not exist.");
return true;
}
JCExpression objectType = chainDots(maker, methodNode, "java", "lang", "Object");
//We use 'new Object[0];' because quite unlike 'new Object();', empty arrays *ARE* serializable!
JCNewArray newObjectArray = maker.NewArray(chainDots(maker, methodNode, "java", "lang", "Object"),
List.<JCExpression>of(maker.Literal(TypeTags.INT, 0)), null);
JCVariableDecl fieldDecl = maker.VarDef(
maker.Modifiers(Flags.FINAL | (isStatic ? Flags.STATIC : 0)),
methodNode.toName(lockName), objectType, newObjectArray);
injectField(methodNode.up(), fieldDecl);
}
if (method.body == null) return false;
JCExpression lockNode = maker.Ident(methodNode.toName(lockName));
method.body = maker.Block(0, List.<JCStatement>of(maker.Synchronized(lockNode, method.body)));
methodNode.rebuild();
return true;
}
}
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