/** {@inheritDoc} */
@Override
public void rewriteAST(CompilationUnitRewrite cuRewrite) throws CoreException {
ASTRewrite rewrite = cuRewrite.getASTRewrite();
TextEditGroup group =
createTextEditGroup(
FixMessages.INSTANCE.UnusedCodeFix_RemoveCast_description(), cuRewrite);
while (fUnnecessaryCasts.size() > 0) {
CastExpression castExpression = fUnnecessaryCasts.iterator().next();
fUnnecessaryCasts.remove(castExpression);
CastExpression down = castExpression;
while (fUnnecessaryCasts.contains(down.getExpression())) {
down = (CastExpression) down.getExpression();
fUnnecessaryCasts.remove(down);
}
Expression expression = down.getExpression();
ASTNode move = rewrite.createMoveTarget(expression);
CastExpression top = castExpression;
while (fUnnecessaryCasts.contains(top.getParent())) {
top = (CastExpression) top.getParent();
fUnnecessaryCasts.remove(top);
}
ASTNode toReplace = top;
if (top.getParent() instanceof ParenthesizedExpression
&& !NecessaryParenthesesChecker.needsParentheses(
expression, top.getParent(), top.getLocationInParent())) {
toReplace = top.getParent();
}
rewrite.replace(toReplace, move, group);
}
}
private void splitUpDeclarations(
ASTRewrite rewrite,
TextEditGroup group,
VariableDeclarationFragment frag,
ListRewrite statementRewrite,
VariableDeclarationStatement originalStatement) {
Expression initializer = frag.getInitializer();
// keep constructors and method invocations
if (initializer instanceof MethodInvocation || initializer instanceof ClassInstanceCreation) {
Expression movedInitializer = (Expression) rewrite.createMoveTarget(initializer);
ExpressionStatement newInitializer =
rewrite.getAST().newExpressionStatement(movedInitializer);
statementRewrite.insertAfter(newInitializer, originalStatement, group);
VariableDeclarationStatement newDeclaration = null;
List<VariableDeclarationFragment> fragments = originalStatement.fragments();
int fragIndex = fragments.indexOf(frag);
ListIterator<VariableDeclarationFragment> fragmentIterator =
fragments.listIterator(fragIndex + 1);
while (fragmentIterator.hasNext()) {
VariableDeclarationFragment currentFragment = fragmentIterator.next();
VariableDeclarationFragment movedFragment =
(VariableDeclarationFragment) rewrite.createMoveTarget(currentFragment);
if (newDeclaration == null) {
newDeclaration = rewrite.getAST().newVariableDeclarationStatement(movedFragment);
Type copiedType = (Type) rewrite.createCopyTarget(originalStatement.getType());
newDeclaration.setType(copiedType);
} else newDeclaration.fragments().add(movedFragment);
}
if (newDeclaration != null) {
statementRewrite.insertAfter(newDeclaration, newInitializer, group);
}
if (originalStatement.fragments().size() == newDeclaration.fragments().size() + 1) {
rewrite.remove(originalStatement, group);
}
}
}
private void removeVariableWithInitializer(
ASTRewrite rewrite, ASTNode initializerNode, ASTNode statementNode, TextEditGroup group) {
boolean performRemove = fForceRemove;
if (!performRemove) {
ArrayList<Expression> sideEffectNodes = new ArrayList<Expression>();
initializerNode.accept(new SideEffectFinder(sideEffectNodes));
performRemove = sideEffectNodes.isEmpty();
}
if (performRemove) {
removeStatement(rewrite, statementNode, group);
fRemovedAssignmentsCount++;
} else {
ASTNode initNode = rewrite.createMoveTarget(initializerNode);
ExpressionStatement statement =
rewrite.getAST().newExpressionStatement((Expression) initNode);
rewrite.replace(statementNode, statement, null);
fAlteredAssignmentsCount++;
}
}
public static void rewriteModifiers(
final FieldDeclaration declarationNode,
final VariableDeclarationFragment[] toChange,
final int includedModifiers,
final int excludedModifiers,
final ASTRewrite rewrite,
final TextEditGroup group) {
final List<VariableDeclarationFragment> fragmentsToChange = Arrays.asList(toChange);
AST ast = declarationNode.getAST();
/*
* Problem: Same declarationNode can be the subject of multiple calls to this method.
* For the 2nd++ calls, the original declarationNode has already been rewritten, and this has to be taken into account.
*
* Assumption:
* - Modifiers for each VariableDeclarationFragment are modified at most once.
*
* Solution:
* - Maintain a map from original VariableDeclarationFragments to their new FieldDeclaration.
* - Original modifiers in declarationNode belong to the first fragment.
* - When a later fragment needs different modifiers, we create a new FieldDeclaration and move all successive fragments into that
* declaration
* - When a fragment has been moved to a new declaration, make sure we don't create a new move target again,
* but instead use the already created one
*/
List<VariableDeclarationFragment> fragments = declarationNode.fragments();
Iterator<VariableDeclarationFragment> iter = fragments.iterator();
ListRewrite blockRewrite;
if (declarationNode.getParent() instanceof AbstractTypeDeclaration) {
blockRewrite =
rewrite.getListRewrite(
declarationNode.getParent(),
((AbstractTypeDeclaration) declarationNode.getParent())
.getBodyDeclarationsProperty());
} else {
blockRewrite =
rewrite.getListRewrite(
declarationNode.getParent(), AnonymousClassDeclaration.BODY_DECLARATIONS_PROPERTY);
}
VariableDeclarationFragment lastFragment = iter.next();
ASTNode lastStatement = declarationNode;
if (fragmentsToChange.contains(lastFragment)) {
ModifierRewrite modifierRewrite = ModifierRewrite.create(rewrite, declarationNode);
modifierRewrite.setModifiers(includedModifiers, excludedModifiers, group);
}
ListRewrite fragmentsRewrite = null;
while (iter.hasNext()) {
VariableDeclarationFragment currentFragment = iter.next();
Map<VariableDeclarationFragment, MovedFragment> lookup =
(Map<VariableDeclarationFragment, MovedFragment>)
rewrite.getProperty(MovedFragment.class.getName());
if (lookup == null) {
lookup = new HashMap<VariableDeclarationFragment, MovedFragment>();
rewrite.setProperty(MovedFragment.class.getName(), lookup);
}
MovedFragment currentMovedFragment = lookup.get(currentFragment);
boolean changeLast = fragmentsToChange.contains(lastFragment);
boolean changeCurrent = fragmentsToChange.contains(currentFragment);
if (changeLast != changeCurrent || lookup.containsKey(lastFragment)) {
ModifierRewrite modifierRewrite = null;
if (currentMovedFragment != null) {
// Current fragment has already been moved.
if (currentMovedFragment.fUsesOriginalModifiers) {
// Need to put in the right modifiers (removing any existing ones).
modifierRewrite = ModifierRewrite.create(rewrite, currentMovedFragment.fDeclaration);
ListRewrite listRewrite =
rewrite.getListRewrite(
currentMovedFragment.fDeclaration, FieldDeclaration.MODIFIERS2_PROPERTY);
List<ASTNode> extendedList = listRewrite.getRewrittenList();
for (int i = 0; i < extendedList.size(); i++) {
ASTNode curr = extendedList.get(i);
if (curr instanceof Modifier) rewrite.remove(curr, group);
}
}
// otherwise, don't need to touch the modifiers, so leave modifierRewrite null
} else { // need to split an existing field declaration
VariableDeclarationFragment moveTarget;
moveTarget = (VariableDeclarationFragment) rewrite.createMoveTarget(currentFragment);
FieldDeclaration newStatement =
(FieldDeclaration) ast.createInstance(FieldDeclaration.FIELD_DECLARATION);
rewrite
.getListRewrite(newStatement, FieldDeclaration.FRAGMENTS_PROPERTY)
.insertLast(moveTarget, group);
lookup.put(currentFragment, new MovedFragment(moveTarget, newStatement, !changeCurrent));
rewrite.set(
newStatement,
FieldDeclaration.TYPE_PROPERTY,
rewrite.createCopyTarget(declarationNode.getType()),
group);
modifierRewrite = ModifierRewrite.create(rewrite, newStatement);
modifierRewrite.copyAllAnnotations(declarationNode, group);
blockRewrite.insertAfter(newStatement, lastStatement, group);
fragmentsRewrite =
rewrite.getListRewrite(newStatement, FieldDeclaration.FRAGMENTS_PROPERTY);
lastStatement = newStatement;
}
if (modifierRewrite != null) {
if (changeCurrent) {
int newModifiers =
(declarationNode.getModifiers() & ~excludedModifiers) | includedModifiers;
modifierRewrite.setModifiers(newModifiers, excludedModifiers, group);
} else {
int newModifiers = declarationNode.getModifiers();
modifierRewrite.setModifiers(newModifiers, Modifier.NONE, group);
}
}
} else if (fragmentsRewrite != null) {
VariableDeclarationFragment fragment0;
boolean usesOriginalModifiers = true;
if (currentMovedFragment != null) {
fragment0 = currentMovedFragment.fMoveTarget;
usesOriginalModifiers = currentMovedFragment.fUsesOriginalModifiers;
rewrite
.getListRewrite(
currentMovedFragment.fDeclaration, FieldDeclaration.FRAGMENTS_PROPERTY)
.remove(fragment0, group);
} else {
fragment0 = (VariableDeclarationFragment) rewrite.createMoveTarget(currentFragment);
}
lookup.put(
currentFragment, new MovedFragment(fragment0, lastStatement, usesOriginalModifiers));
fragmentsRewrite.insertLast(fragment0, group);
}
lastFragment = currentFragment;
}
}
public static void rewriteModifiers(
final VariableDeclarationStatement declarationNode,
final VariableDeclarationFragment[] toChange,
final int includedModifiers,
final int excludedModifiers,
ASTRewrite rewrite,
final TextEditGroup group) {
final List<VariableDeclarationFragment> fragmentsToChange = Arrays.asList(toChange);
AST ast = declarationNode.getAST();
List<VariableDeclarationFragment> fragments = declarationNode.fragments();
Iterator<VariableDeclarationFragment> iter = fragments.iterator();
ListRewrite blockRewrite = null;
ASTNode parentStatement = declarationNode.getParent();
if (parentStatement instanceof SwitchStatement) {
blockRewrite = rewrite.getListRewrite(parentStatement, SwitchStatement.STATEMENTS_PROPERTY);
} else if (parentStatement instanceof Block) {
blockRewrite = rewrite.getListRewrite(parentStatement, Block.STATEMENTS_PROPERTY);
} else {
// should not happen. VariableDeclaration's can not be in a control statement body
Assert.isTrue(false);
}
VariableDeclarationFragment lastFragment = iter.next();
ASTNode lastStatement = declarationNode;
boolean modifiersModified = false;
if (fragmentsToChange.contains(lastFragment)) {
ModifierRewrite modifierRewrite = ModifierRewrite.create(rewrite, declarationNode);
modifierRewrite.setModifiers(includedModifiers, excludedModifiers, group);
modifiersModified = true;
}
ListRewrite fragmentsRewrite = null;
while (iter.hasNext()) {
VariableDeclarationFragment currentFragment = iter.next();
if (fragmentsToChange.contains(lastFragment) != fragmentsToChange.contains(currentFragment)) {
VariableDeclarationStatement newStatement =
ast.newVariableDeclarationStatement(
(VariableDeclarationFragment) rewrite.createMoveTarget(currentFragment));
newStatement.setType((Type) rewrite.createCopyTarget(declarationNode.getType()));
ModifierRewrite modifierRewrite = ModifierRewrite.create(rewrite, newStatement);
if (fragmentsToChange.contains(currentFragment)) {
modifierRewrite.copyAllAnnotations(declarationNode, group);
int newModifiers =
(declarationNode.getModifiers() & ~excludedModifiers) | includedModifiers;
modifierRewrite.setModifiers(newModifiers, excludedModifiers, group);
} else {
modifierRewrite.copyAllModifiers(declarationNode, group, modifiersModified);
}
blockRewrite.insertAfter(newStatement, lastStatement, group);
fragmentsRewrite =
rewrite.getListRewrite(newStatement, VariableDeclarationStatement.FRAGMENTS_PROPERTY);
lastStatement = newStatement;
} else if (fragmentsRewrite != null) {
ASTNode fragment0 = rewrite.createMoveTarget(currentFragment);
fragmentsRewrite.insertLast(fragment0, group);
}
lastFragment = currentFragment;
}
}
/**
* 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);
}
}
}