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package lombok.eclipse.handlers;
import java.util.Arrays;
import lombok.Cleanup;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseAST.Node;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Assignment;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.CaseStatement;
import org.eclipse.jdt.internal.compiler.ast.CastExpression;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MemberValuePair;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.SwitchStatement;
import org.eclipse.jdt.internal.compiler.ast.TryStatement;
import org.mangosdk.spi.ProviderFor;
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleCleanup implements EclipseAnnotationHandler<Cleanup> {
public boolean handle(AnnotationValues<Cleanup> annotation, Annotation ast, Node annotationNode) {
String cleanupName = annotation.getInstance().cleanupMethod();
if ( cleanupName.length() == 0 ) {
annotationNode.addError("cleanupName cannot be the empty string.");
return true;
}
if ( annotationNode.up().getKind() != Kind.LOCAL ) {
annotationNode.addError("@Cleanup is legal only on local variable declarations.");
return true;
}
LocalDeclaration decl = (LocalDeclaration)annotationNode.up().get();
if ( decl.initialization == null ) {
annotationNode.addError("@Cleanup variable declarations need to be initialized.");
return true;
}
Node ancestor = annotationNode.up().directUp();
ASTNode blockNode = ancestor.get();
final boolean isSwitch;
final Statement[] statements;
if ( blockNode instanceof AbstractMethodDeclaration ) {
isSwitch = false;
statements = ((AbstractMethodDeclaration)blockNode).statements;
} else if ( blockNode instanceof Block ) {
isSwitch = false;
statements = ((Block)blockNode).statements;
} else if ( blockNode instanceof SwitchStatement ) {
isSwitch = true;
statements = ((SwitchStatement)blockNode).statements;
} else {
annotationNode.addError("@Cleanup is legal only on a local variable declaration inside a block.");
return true;
}
if ( statements == null ) {
annotationNode.addError("LOMBOK BUG: Parent block does not contain any statements.");
return true;
}
int start = 0;
for ( ; start < statements.length ; start++ ) {
if ( statements[start] == decl ) break;
}
if ( start == statements.length ) {
annotationNode.addError("LOMBOK BUG: Can't find this local variable declaration inside its parent.");
return true;
}
start++; //We start with try{} *AFTER* the var declaration.
int end;
if ( isSwitch ) {
end = start + 1;
for ( ; end < statements.length ; end++ ) {
if ( statements[end] instanceof CaseStatement ) {
break;
}
}
} else end = statements.length;
//At this point:
// start-1 = Local Declaration marked with @Cleanup
// start = first instruction that needs to be wrapped into a try block
// end = last intruction of the scope -OR- last instruction before the next case label in switch statements.
// hence:
// [start, end) = statements for the try block.
Statement[] tryBlock = new Statement[end - start];
System.arraycopy(statements, start, tryBlock, 0, end-start);
//Remove the stuff we just dumped into the tryBlock, and then leave room for the try node.
int newStatementsLength = statements.length - (end-start); //Remove room for every statement moved into try block...
newStatementsLength += 1; //But add room for the TryStatement node itself.
Statement[] newStatements = new Statement[newStatementsLength];
System.arraycopy(statements, 0, newStatements, 0, start); //copy all statements before the try block verbatim.
System.arraycopy(statements, end, newStatements, start+1, statements.length - end); //For switch statements.
doAssignmentCheck(annotationNode, tryBlock, decl.name);
TryStatement tryStatement = new TryStatement();
tryStatement.tryBlock = new Block(0);
tryStatement.tryBlock.statements = tryBlock;
newStatements[start] = tryStatement;
Statement[] finallyBlock = new Statement[1];
MessageSend unsafeClose = new MessageSend();
unsafeClose.sourceStart = ast.sourceStart;
unsafeClose.sourceEnd = ast.sourceEnd;
SingleNameReference receiver = new SingleNameReference(decl.name, 0);
unsafeClose.receiver = receiver;
long nameSourcePosition = (long)ast.sourceStart << 32 | ast.sourceEnd;
if ( ast.memberValuePairs() != null ) for ( MemberValuePair pair : ast.memberValuePairs() ) {
if ( pair.name != null && new String(pair.name).equals("cleanupMethod") ) {
nameSourcePosition = (long)pair.value.sourceStart << 32 | pair.value.sourceEnd;
break;
}
}
unsafeClose.nameSourcePosition = nameSourcePosition;
unsafeClose.selector = cleanupName.toCharArray();
finallyBlock[0] = unsafeClose;
tryStatement.finallyBlock = new Block(0);
tryStatement.finallyBlock.statements = finallyBlock;
tryStatement.catchArguments = null;
tryStatement.catchBlocks = null;
if ( blockNode instanceof AbstractMethodDeclaration ) {
((AbstractMethodDeclaration)blockNode).statements = newStatements;
} else if ( blockNode instanceof Block ) {
((Block)blockNode).statements = newStatements;
} else if ( blockNode instanceof SwitchStatement ) {
((SwitchStatement)blockNode).statements = newStatements;
}
ancestor.rebuild();
return true;
}
private void doAssignmentCheck(Node node, Statement[] tryBlock, char[] varName) {
for ( Statement statement : tryBlock ) doAssignmentCheck0(node, statement, varName);
}
private void doAssignmentCheck0(Node node, Statement statement, char[] varName) {
if ( statement instanceof Assignment )
doAssignmentCheck0(node, ((Assignment)statement).expression, varName);
else if ( statement instanceof LocalDeclaration )
doAssignmentCheck0(node, ((LocalDeclaration)statement).initialization, varName);
else if ( statement instanceof CastExpression )
doAssignmentCheck0(node, ((CastExpression)statement).expression, varName);
else if ( statement instanceof SingleNameReference ) {
if ( Arrays.equals(((SingleNameReference)statement).token, varName) ) {
Node problemNode = node.getNodeFor(statement);
if ( problemNode != null ) problemNode.addWarning(
"You're assigning an auto-cleanup variable to something else. This is a bad idea.");
}
}
}
}
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