InterfaceMethodClashesWithObjectInspection.java

/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * 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.abstraction;

import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiClassType;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiType;
import com.siyeh.InspectionGadgetsBundle;import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;

/**
 * @author Bas Leijdekkers
 */
public class InterfaceMethodClashesWithObjectInspection extends BaseInspection {
  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return InspectionGadgetsBundle.message("interface.clashes.with.object.class.display.name");
  }

  @NotNull
  @Override
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message("interface.clashes.with.object.class.problem.descriptor");
  }

  @Override
  public boolean isEnabledByDefault() {
    return true;
  }

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

  private static class InterfaceClashesWithObjectClassVisitor extends BaseInspectionVisitor {

    @Override
    public void visitMethod(PsiMethod method) {
      super.visitMethod(method);
      if (method.getParameterList().getParametersCount() != 0) {
        return;
      }
      final PsiClass aClass = method.getContainingClass();
      if (aClass == null || !aClass.isInterface()) {
        return;
      }
      final String name = method.getName();
      if ("clone".equals(name) && !(method.getReturnType() instanceof PsiClassType)) {
        registerMethodError(method);
      }
      else if ("finalize".equals(name) && !PsiType.VOID.equals(method.getReturnType())) {
        registerMethodError(method);
      }
    }
  }
}