plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/errorhandling/CatchParameterUsedVisitor.java

/*
 * Copyright 2003-2005 Dave Griffith
 *
 * 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.errorhandling;

import com.intellij.psi.JavaRecursiveElementVisitor;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiParameter;
import com.intellij.psi.PsiReferenceExpression;
import org.jetbrains.annotations.NotNull;

class CatchParameterUsedVisitor extends JavaRecursiveElementVisitor {

  private final PsiParameter parameter;
  private boolean used = false;

  CatchParameterUsedVisitor(PsiParameter variable) {
    super();
    parameter = variable;
  }

  @Override
  public void visitElement(@NotNull PsiElement element) {
    if (!used) {
      super.visitElement(element);
    }
  }

  @Override
  public void visitReferenceExpression(
    @NotNull PsiReferenceExpression reference) {
    if (used) {
      return;
    }
    super.visitReferenceExpression(reference);
    final PsiElement element = reference.resolve();
    if (parameter.equals(element)) {
      used = true;
    }
  }

  public boolean isUsed() {
    return used;
  }
}