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/*
* Copyright 2003-2010 Dave Griffith, Bas Leijdekkers
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.siyeh.ig.psiutils;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;
class VariableAssignedFromVisitor extends JavaRecursiveElementVisitor {
private boolean assignedFrom = false;
@NotNull
private final PsiVariable variable;
public VariableAssignedFromVisitor(@NotNull PsiVariable variable) {
super();
this.variable = variable;
}
@Override
public void visitElement(@NotNull PsiElement element) {
if (!assignedFrom) {
super.visitElement(element);
}
}
@Override
public void visitAssignmentExpression(
@NotNull PsiAssignmentExpression assignment) {
if (assignedFrom) {
return;
}
super.visitAssignmentExpression(assignment);
final PsiExpression arg = assignment.getRExpression();
if (VariableAccessUtils.mayEvaluateToVariable(arg, variable)) {
assignedFrom = true;
}
}
@Override
public void visitDeclarationStatement(
@NotNull PsiDeclarationStatement statement) {
if (assignedFrom) {
return;
}
super.visitDeclarationStatement(statement);
final PsiElement[] declaredElements = statement.getDeclaredElements();
for (PsiElement declaredElement : declaredElements) {
if (declaredElement instanceof PsiVariable) {
final PsiVariable declaredVariable =
(PsiVariable)declaredElement;
final PsiExpression initializer =
declaredVariable.getInitializer();
if (initializer != null &&
VariableAccessUtils.mayEvaluateToVariable(initializer,
variable)) {
assignedFrom = true;
return;
}
}
}
}
@Override
public void visitVariable(@NotNull PsiVariable var) {
if (assignedFrom) {
return;
}
super.visitVariable(var);
final PsiExpression arg = var.getInitializer();
if (VariableAccessUtils.mayEvaluateToVariable(arg, variable)) {
assignedFrom = true;
}
}
public boolean isAssignedFrom() {
return assignedFrom;
}
}
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