ExtendsThrowableInspection.java

/*
 * Copyright 2000-2015 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.errorhandling;

import com.intellij.psi.CommonClassNames;
import com.intellij.psi.PsiAnonymousClass;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiTypeParameter;
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 ExtendsThrowableInspection extends BaseInspection {

  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return InspectionGadgetsBundle.message("extends.throwable.display.name");
  }

  @NotNull
  @Override
  protected String buildErrorString(Object... infos) {
    final PsiClass aClass = (PsiClass)infos[0];
    if (aClass instanceof PsiAnonymousClass) {
      return InspectionGadgetsBundle.message("anonymous.extends.throwable.problem.descriptor");
    } else {
      return InspectionGadgetsBundle.message("extends.throwable.problem.descriptor");
    }
  }

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

  private static class ExtendsThrowableVisitor extends BaseInspectionVisitor {

    @Override
    public void visitClass(@NotNull PsiClass aClass) {
      if (aClass.isInterface() || aClass.isAnnotationType() || aClass.isEnum() || aClass instanceof PsiTypeParameter) {
        return;
      }
      final PsiClass superClass = aClass.getSuperClass();
      if (superClass == null) {
        return;
      }
      final String superclassName = superClass.getQualifiedName();
      if (!CommonClassNames.JAVA_LANG_THROWABLE.equals(superclassName)) {
        return;
      }
      registerClassError(aClass, aClass);
    }
  }
}