private boolean ifVerify(ASTIfStatement is, String varname) {
List finder = new ArrayList();
is.findChildrenOfType(ASTPrimaryExpression.class, finder, true);
if (finder.size() > 1) {
ASTPrimaryExpression apeLeft = (ASTPrimaryExpression) finder.get(0);
if (matchName(apeLeft, varname)) {
ASTPrimaryExpression apeRight = (ASTPrimaryExpression) finder.get(1);
if ((apeRight.jjtGetNumChildren() == 1)
&& (apeRight.jjtGetChild(0) instanceof ASTPrimaryPrefix)) {
ASTPrimaryPrefix pp2 = (ASTPrimaryPrefix) apeRight.jjtGetChild(0);
if ((pp2.jjtGetNumChildren() == 1) && (pp2.jjtGetChild(0) instanceof ASTLiteral)) {
ASTLiteral lit = (ASTLiteral) pp2.jjtGetChild(0);
if ((lit.jjtGetNumChildren() == 1) && (lit.jjtGetChild(0) instanceof ASTNullLiteral)) {
return true;
}
}
}
}
}
return false;
}
public Object visit(ASTMethodDeclaration node, Object data) {
if (interfaceSkipper == true) { // skip methods in interfaces
return super.visit(node, data);
}
ASTResultType rt = (ASTResultType) node.jjtGetChild(0);
if (rt.isVoid() == true) {
return super.visit(node, data);
}
ASTType t = (ASTType) rt.jjtGetChild(0);
if (t.jjtGetNumChildren() == 0 || !(t.jjtGetChild(0) instanceof ASTName)) {
return super.visit(node, data);
}
String returnVariableName = null;
List finder = new ArrayList();
GET_RETURN_VARIABLE_NAME:
{
node.findChildrenOfType(ASTReturnStatement.class, finder, true);
if (finder.size() != 1) {
return super.visit(node, data);
}
ASTReturnStatement rs =
(ASTReturnStatement)
finder.get(0); // EXPLODES IF THE CLASS IS AN INTERFACE SINCE NO RETURN
finder.clear();
rs.findChildrenOfType(ASTPrimaryExpression.class, finder, true);
ASTPrimaryExpression ape = (ASTPrimaryExpression) finder.get(0);
Node lastChild = ape.jjtGetChild(ape.jjtGetNumChildren() - 1);
if (lastChild instanceof ASTPrimaryPrefix) {
returnVariableName = getNameFromPrimaryPrefix((ASTPrimaryPrefix) lastChild);
}
if (returnVariableName == null) {
return super.visit(node, data);
}
}
CHECK_OUTER_IF:
{
finder.clear();
node.findChildrenOfType(ASTIfStatement.class, finder, true);
if (finder.size() == 2) {
ASTIfStatement is = (ASTIfStatement) finder.get(0);
if (ifVerify(is, returnVariableName)) {
// find synchronized
finder.clear();
is.findChildrenOfType(ASTSynchronizedStatement.class, finder, true);
if (finder.size() == 1) {
ASTSynchronizedStatement ss = (ASTSynchronizedStatement) finder.get(0);
finder.clear();
ss.findChildrenOfType(ASTIfStatement.class, finder, true);
if (finder.size() == 1) {
ASTIfStatement is2 = (ASTIfStatement) finder.get(0);
if (ifVerify(is2, returnVariableName)) {
finder.clear();
is2.findChildrenOfType(ASTStatementExpression.class, finder, true);
if (finder.size() == 1) {
ASTStatementExpression se = (ASTStatementExpression) finder.get(0);
if (se.jjtGetNumChildren()
== 3) { // primaryExpression, AssignmentOperator, Expression
if (se.jjtGetChild(0) instanceof ASTPrimaryExpression) {
ASTPrimaryExpression pe = (ASTPrimaryExpression) se.jjtGetChild(0);
if (matchName(pe, returnVariableName)) {
if (se.jjtGetChild(1) instanceof ASTAssignmentOperator) {
RuleContext ctx = (RuleContext) data;
ctx.getReport()
.addRuleViolation(createRuleViolation(ctx, node.getBeginLine()));
}
}
}
}
}
}
}
}
}
}
}
return super.visit(node, data);
}