private static boolean hasSideEffect(SimpleName reference) {
ASTNode parent = reference.getParent();
while (parent instanceof QualifiedName) {
parent = parent.getParent();
}
if (parent instanceof FieldAccess) {
parent = parent.getParent();
}
ASTNode node = null;
int nameParentType = parent.getNodeType();
if (nameParentType == ASTNode.ASSIGNMENT) {
Assignment assignment = (Assignment) parent;
node = assignment.getRightHandSide();
} else if (nameParentType == ASTNode.SINGLE_VARIABLE_DECLARATION) {
SingleVariableDeclaration decl = (SingleVariableDeclaration) parent;
node = decl.getInitializer();
if (node == null) return false;
} else if (nameParentType == ASTNode.VARIABLE_DECLARATION_FRAGMENT) {
node = parent;
} else {
return false;
}
ArrayList<Expression> sideEffects = new ArrayList<Expression>();
node.accept(new SideEffectFinder(sideEffects));
return sideEffects.size() > 0;
}
/**
* Remove the field or variable declaration including the initializer.
*
* @param rewrite the AST rewriter to use
* @param reference a reference to the variable to remove
* @param group the text edit group to use
*/
private void removeVariableReferences(
ASTRewrite rewrite, SimpleName reference, TextEditGroup group) {
ASTNode parent = reference.getParent();
while (parent instanceof QualifiedName) {
parent = parent.getParent();
}
if (parent instanceof FieldAccess) {
parent = parent.getParent();
}
int nameParentType = parent.getNodeType();
if (nameParentType == ASTNode.ASSIGNMENT) {
Assignment assignment = (Assignment) parent;
Expression rightHand = assignment.getRightHandSide();
ASTNode assignParent = assignment.getParent();
if (assignParent.getNodeType() == ASTNode.EXPRESSION_STATEMENT
&& rightHand.getNodeType() != ASTNode.ASSIGNMENT) {
removeVariableWithInitializer(rewrite, rightHand, assignParent, group);
} else {
rewrite.replace(assignment, rewrite.createCopyTarget(rightHand), group);
}
} else if (nameParentType == ASTNode.SINGLE_VARIABLE_DECLARATION) {
rewrite.remove(parent, group);
} else if (nameParentType == ASTNode.VARIABLE_DECLARATION_FRAGMENT) {
VariableDeclarationFragment frag = (VariableDeclarationFragment) parent;
ASTNode varDecl = frag.getParent();
List<VariableDeclarationFragment> fragments;
if (varDecl instanceof VariableDeclarationExpression) {
fragments = ((VariableDeclarationExpression) varDecl).fragments();
} else if (varDecl instanceof FieldDeclaration) {
fragments = ((FieldDeclaration) varDecl).fragments();
} else {
fragments = ((VariableDeclarationStatement) varDecl).fragments();
}
Expression initializer = frag.getInitializer();
if (initializer instanceof CastExpression) {
initializer = ((CastExpression) initializer).getExpression();
}
boolean sideEffectInitializer =
initializer instanceof MethodInvocation || initializer instanceof ClassInstanceCreation;
if (fragments.size() == fUnusedNames.length) {
if (fForceRemove) {
rewrite.remove(varDecl, group);
return;
}
if (parent.getParent() instanceof FieldDeclaration) {
rewrite.remove(varDecl, group);
return;
}
if (sideEffectInitializer) {
Expression movedInit = (Expression) rewrite.createMoveTarget(initializer);
ExpressionStatement wrapped = rewrite.getAST().newExpressionStatement(movedInit);
rewrite.replace(varDecl, wrapped, group);
} else {
rewrite.remove(varDecl, group);
}
} else {
if (fForceRemove) {
rewrite.remove(frag, group);
return;
}
// multiple declarations in one line
ASTNode declaration = parent.getParent();
if (declaration instanceof FieldDeclaration) {
rewrite.remove(frag, group);
return;
}
if (declaration instanceof VariableDeclarationStatement) {
ASTNode lst = declaration.getParent();
ListRewrite listRewrite = null;
if (lst instanceof Block) {
listRewrite = rewrite.getListRewrite(lst, Block.STATEMENTS_PROPERTY);
} else if (lst instanceof SwitchStatement) {
listRewrite = rewrite.getListRewrite(lst, SwitchStatement.STATEMENTS_PROPERTY);
} else {
Assert.isTrue(false);
}
splitUpDeclarations(
rewrite, group, frag, listRewrite, (VariableDeclarationStatement) declaration);
rewrite.remove(frag, group);
return;
}
if (declaration instanceof VariableDeclarationExpression) {
// keep constructors and method invocations
if (!sideEffectInitializer) {
rewrite.remove(frag, group);
}
}
}
} else if (nameParentType == ASTNode.POSTFIX_EXPRESSION
|| nameParentType == ASTNode.PREFIX_EXPRESSION) {
Expression expression = (Expression) parent;
ASTNode expressionParent = expression.getParent();
if (expressionParent.getNodeType() == ASTNode.EXPRESSION_STATEMENT) {
removeStatement(rewrite, expressionParent, group);
} else {
rewrite.remove(expression, group);
}
}
}