LambdaParameterHidingMemberVariableInspectionBase.java

/*
 * Copyright 2003-2016 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.visibility;

import com.intellij.codeInspection.ui.MultipleCheckboxOptionsPanel;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiUtil;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.psiutils.ClassUtils;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;

public class LambdaParameterHidingMemberVariableInspectionBase extends BaseInspection {

  @SuppressWarnings("PublicField")
  public boolean m_ignoreInvisibleFields = true;

  @Override
  @NotNull
  public String getID() {
    return "LambdaParameterHidesMemberVariable";
  }

  @Override
  @NotNull
  public String getDisplayName() {
    return InspectionGadgetsBundle.message("lambda.parameter.hides.member.variable.display.name");
  }

  @Override
  protected boolean buildQuickFixesOnlyForOnTheFlyErrors() {
    return true;
  }

  @Override
  @NotNull
  public String buildErrorString(Object... infos) {
    final PsiClass aClass = (PsiClass)infos[0];
    return InspectionGadgetsBundle.message("lambda.parameter.hides.member.variable.problem.descriptor", aClass.getName());
  }

  @Override
  public JComponent createOptionsPanel() {
    final MultipleCheckboxOptionsPanel optionsPanel = new MultipleCheckboxOptionsPanel(this);
    optionsPanel.addCheckbox(InspectionGadgetsBundle.message("lambda.parameter.hides.member.variable.ignore.invisible.option"),
                             "m_ignoreInvisibleFields");
    return optionsPanel;
  }

  @Override
  public boolean shouldInspect(PsiFile file) {
    return PsiUtil.isLanguageLevel8OrHigher(file);
  }

  @Override
  public BaseInspectionVisitor buildVisitor() {
    return new LambdaParameterHidingMemberVariableVisitor();
  }

  private class LambdaParameterHidingMemberVariableVisitor extends BaseInspectionVisitor {

    @Override
    public void visitParameter(@NotNull PsiParameter variable) {
      super.visitParameter(variable);
      final PsiElement declarationScope = variable.getDeclarationScope();
      if (!(declarationScope instanceof PsiLambdaExpression)) {
        return;
      }
      final PsiClass aClass = checkFieldName(variable);
      if (aClass ==  null) {
        return;
      }
      registerVariableError(variable, aClass);
    }

    @Nullable
    private PsiClass checkFieldName(PsiVariable variable) {
      final String variableName = variable.getName();
      if (variableName == null) {
        return null;
      }
      PsiClass aClass = ClassUtils.getContainingClass(variable);
      while (aClass != null) {
        final PsiField field = aClass.findFieldByName(variableName, true);
        if (field != null) {
          if (!m_ignoreInvisibleFields){
            return aClass;
          }
          else if (ClassUtils.isFieldVisible(field, aClass) &&
                   (PsiUtil.getEnclosingStaticElement(variable, aClass) == null) || field.hasModifierProperty(PsiModifier.STATIC)){
            return aClass;
          }
        }
        aClass = ClassUtils.getContainingClass(aClass);
      }
      return null;
    }
  }
}