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package lombok.javac.handlers;
import static lombok.javac.handlers.PKG.*;
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.JavacAST.Node;
@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, Node annotationNode) {
Node 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 = isStatic ? STATIC_LOCK_NAME : INSTANCE_LOCK_NAME;
TreeMaker maker = methodNode.getTreeMaker();
if ( fieldExists(lockName, methodNode) == MemberExistsResult.NOT_EXISTS ) {
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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