/*
* (non-Javadoc)
*
* @see org.walkmod.javalang.visitors.VoidVisitorAdapter#visit(org.walkmod.javalang .ast.stmt.BlockStmt,
* java.lang.Object)
*/
@Override
public void visit(BlockStmt n, VisitorContext arg) {
List<Statement> stmts = n.getStmts();
if (stmts == null) {
super.visit(n, arg);
return;
}
int returnStmtIndex = -1;
String variableName = null;
for (int i = 0; i < stmts.size(); i++) {
Statement statement = stmts.get(i);
if (statement instanceof ReturnStmt) {
Expression expr = ((ReturnStmt) statement).getExpr();
if (expr instanceof NameExpr) {
returnStmtIndex = i;
variableName = ((NameExpr) expr).getName();
break;
}
}
}
if (returnStmtIndex > 0) {
Statement statement = stmts.get(returnStmtIndex - 1);
boolean isEmpty = false;
boolean isRemove = false;
Expression init = null;
if (statement instanceof ExpressionStmt) {
Expression expression = ((ExpressionStmt) statement).getExpression();
if (expression instanceof VariableDeclarationExpr) {
List<VariableDeclarator> vars = ((VariableDeclarationExpr) expression).getVars();
for (VariableDeclarator variableDeclarator : vars) {
if (variableDeclarator.getId().getName().equals(variableName)) {
init = variableDeclarator.getInit();
vars.remove(variableDeclarator);
isRemove = true;
break;
}
}
isEmpty = vars.isEmpty();
} else if (expression instanceof AssignExpr) {
AssignExpr assignExpr = (AssignExpr) expression;
if (assignExpr.getOperator() == ASSIGN_OPERATOR) {
Expression target = assignExpr.getTarget();
if (target instanceof NameExpr) {
NameExpr expr = (NameExpr) target;
if (expr.getName().equals(variableName)) {
init = assignExpr.getValue();
isRemove = true;
isEmpty = true;
}
}
}
}
if (isRemove) {
ReturnStmt returnStmt = (ReturnStmt) stmts.get(returnStmtIndex);
returnStmt.setExpr(init);
if (isEmpty) {
stmts.remove(returnStmtIndex - 1);
}
}
}
}
super.visit(n, arg);
}
@Override
public void visit(MethodDeclaration md, T ctx) {
BlockStmt block = md.getBody();
if (block != null) {
List<Statement> stmts = block.getStmts();
if (stmts != null) {
if (stmts.size() == 2) {
Statement firstStmt = stmts.get(0);
if (firstStmt instanceof IfStmt) {
Statement lastStmt = stmts.get(1);
if (lastStmt instanceof ReturnStmt) {
IfStmt ifStmt = (IfStmt) firstStmt;
Expression condition = ifStmt.getCondition();
if (condition instanceof BinaryExpr) {
BinaryExpr be = (BinaryExpr) condition;
if (be.getOperator().equals(BinaryExpr.Operator.equals)) {
if (be.getRight() instanceof NullLiteralExpr) {
Expression leftExpr = be.getLeft();
ReturnStmt returnStmt = (ReturnStmt) lastStmt;
Expression returnedExpr = returnStmt.getExpr();
CheckSameObjectField<T> visitor1 = new CheckSameObjectField<T>();
leftExpr.accept(visitor1, ctx);
String variableNameOfCheckingNull = visitor1.getName();
visitor1 = new CheckSameObjectField<T>();
returnedExpr.accept(visitor1, ctx);
String variableNameOfReturnExpression = visitor1.getName();
if (variableNameOfCheckingNull != null
&& variableNameOfReturnExpression != null
&& variableNameOfCheckingNull.equals(variableNameOfReturnExpression)) {
Statement thenStmt = ifStmt.getThenStmt();
if (thenStmt instanceof BlockStmt) {
BlockStmt thenBlock = (BlockStmt) thenStmt;
List<Statement> blockStmts = thenBlock.getStmts();
if (blockStmts != null && blockStmts.size() == 1) {
SynchronizedStmt synchStmt = new SynchronizedStmt();
BlockStmt innerBlock = new BlockStmt();
List<Statement> innerStmts = new LinkedList<Statement>();
BlockStmt newBlock = new BlockStmt();
List<Statement> newStmts = new LinkedList<Statement>();
newStmts.add(blockStmts.get(0));
newBlock.setStmts(newStmts);
IfStmt newIf =
new IfStmt(
new BinaryExpr(
new NameExpr(variableNameOfReturnExpression),
new NullLiteralExpr(),
BinaryExpr.Operator.equals),
newBlock,
null);
innerStmts.add(newIf);
innerBlock.setStmts(innerStmts);
synchStmt.setBlock(innerBlock);
synchStmt.setExpr(new ThisExpr());
blockStmts.clear();
blockStmts.add(synchStmt);
}
} else {
BlockStmt blockStmt = new BlockStmt();
List<Statement> stmtList = new LinkedList<Statement>();
SynchronizedStmt synchStmt = new SynchronizedStmt();
BlockStmt innerBlock = new BlockStmt();
List<Statement> innerStmts = new LinkedList<Statement>();
IfStmt newIf =
new IfStmt(
new BinaryExpr(
new NameExpr(variableNameOfReturnExpression),
new NullLiteralExpr(),
BinaryExpr.Operator.equals),
thenStmt,
null);
innerStmts.add(newIf);
innerBlock.setStmts(innerStmts);
synchStmt.setBlock(innerBlock);
synchStmt.setExpr(new ThisExpr());
stmtList.add(synchStmt);
blockStmt.setStmts(stmtList);
ifStmt.setThenStmt(blockStmt);
}
}
}
}
}
}
}
}
}
}
}