plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/VariablePassedAsArgumentVisitor.java

/*
 * Copyright 2003-2014 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 VariablePassedAsArgumentVisitor extends JavaRecursiveElementVisitor {

  @NotNull
  private final PsiVariable variable;
  private boolean passed = false;

  public VariablePassedAsArgumentVisitor(@NotNull PsiVariable variable) {
    super();
    this.variable = variable;
  }

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

  @Override
  public void visitCallExpression(PsiCallExpression callExpression) {
    super.visitCallExpression(callExpression);
    if (passed) {
      return;
    }
    visitCall(callExpression);
  }

  @Override
  public void visitEnumConstant(PsiEnumConstant enumConstant) {
    if (passed) {
      return;
    }
    super.visitEnumConstant(enumConstant);
    visitCall(enumConstant);
  }

  private void visitCall(PsiCall call) {
    final PsiExpressionList argumentList = call.getArgumentList();
    if (argumentList == null) {
      return;
    }
    for (PsiExpression argument : argumentList.getExpressions()) {
      if (VariableAccessUtils.mayEvaluateToVariable(argument, variable)) {
        passed = true;
        break;
      }
    }
  }

  public boolean isPassed() {
    return passed;
  }
}