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package lombok.eclipse.handlers;
import static lombok.eclipse.handlers.PKG.*;
import java.lang.reflect.Modifier;
import lombok.Synchronized;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseAST.Node;
import lombok.eclipse.handlers.PKG.MemberExistsResult;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.ArrayAllocationExpression;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.FieldReference;
import org.eclipse.jdt.internal.compiler.ast.IntLiteral;
import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.SynchronizedStatement;
import org.eclipse.jdt.internal.compiler.ast.ThisReference;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.mangosdk.spi.ProviderFor;
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleSynchronized implements EclipseAnnotationHandler<Synchronized> {
private static final char[] INSTANCE_LOCK_NAME = "$lock".toCharArray();
private static final char[] STATIC_LOCK_NAME = "$LOCK".toCharArray();
@Override public boolean handle(AnnotationValues<Synchronized> annotation, Annotation ast, Node annotationNode) {
int p1 = ast.sourceStart -1;
int p2 = ast.sourceStart -2;
long pos = (((long)p1) << 32) | p2;
Node methodNode = annotationNode.up();
if ( methodNode == null || methodNode.getKind() != Kind.METHOD || !(methodNode.get() instanceof MethodDeclaration) ) {
annotationNode.addError("@Synchronized is legal only on methods.");
return true;
}
MethodDeclaration method = (MethodDeclaration)methodNode.get();
if ( method.isAbstract() ) {
annotationNode.addError("@Synchronized is legal only on concrete methods.");
return true;
}
char[] lockName = method.isStatic() ? STATIC_LOCK_NAME : INSTANCE_LOCK_NAME;
if ( fieldExists(new String(lockName), methodNode) == MemberExistsResult.NOT_EXISTS ) {
FieldDeclaration fieldDecl = new FieldDeclaration(lockName, 0, -1);
fieldDecl.declarationSourceEnd = -1;
fieldDecl.modifiers = (method.isStatic() ? Modifier.STATIC : 0) | Modifier.FINAL | Modifier.PRIVATE;
//We use 'new Object[0];' because quite unlike 'new Object();', empty arrays *ARE* serializable!
ArrayAllocationExpression arrayAlloc = new ArrayAllocationExpression();
arrayAlloc.dimensions = new Expression[] { new IntLiteral(new char[] { '0' }, 0, 0) };
arrayAlloc.type = new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, new long[] { 0, 0, 0 });
fieldDecl.type = new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, new long[] { 0, 0, 0 });
fieldDecl.initialization = arrayAlloc;
injectField(annotationNode.up().up(), fieldDecl);
}
if ( method.statements == null ) return false;
Block block = new Block(0);
block.statements = method.statements;
Expression lockVariable;
if ( method.isStatic() ) lockVariable = new QualifiedNameReference(new char[][] {
methodNode.up().getName().toCharArray(), lockName }, new long[] { pos, pos }, p1, p2);
else {
lockVariable = new FieldReference(lockName, pos);
((FieldReference)lockVariable).receiver = new ThisReference(p1, p2);
}
method.statements = new Statement[] {
new SynchronizedStatement(lockVariable, block, 0, 0)
};
methodNode.rebuild();
return true;
}
}
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