| /* |
| * 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.JavaRecursiveElementVisitor; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiReferenceExpression; |
| import com.intellij.psi.PsiVariable; |
| import org.jetbrains.annotations.NotNull; |
| |
| class VariableUsedVisitor extends JavaRecursiveElementVisitor { |
| |
| private boolean used = false; |
| @NotNull private final PsiVariable variable; |
| |
| public VariableUsedVisitor(@NotNull PsiVariable variable) { |
| this.variable = variable; |
| } |
| |
| @Override |
| public void visitElement(@NotNull PsiElement element) { |
| if (used) { |
| return; |
| } |
| super.visitElement(element); |
| } |
| |
| @Override |
| public void visitReferenceExpression( |
| @NotNull PsiReferenceExpression referenceExpression) { |
| if (used) { |
| return; |
| } |
| super.visitReferenceExpression(referenceExpression); |
| final PsiElement target = referenceExpression.resolve(); |
| if (target == null) { |
| return; |
| } |
| if (target.equals(variable)) { |
| used = true; |
| } |
| } |
| |
| public boolean isUsed() { |
| return used; |
| } |
| } |