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A packaging of the IntelliJ Community Edition java-analysis-impl library. This is release number 1 of trunk branch 142.

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/*
 * Copyright 2006-2007 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.inheritance;

import com.intellij.codeInspection.ui.SingleCheckboxOptionsPanel;
import com.intellij.psi.PsiClass;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.psiutils.InheritanceUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;

public class InterfaceNeverImplementedInspection extends BaseInspection {

  /**
   * @noinspection PublicField
   */
  public boolean ignoreInterfacesThatOnlyDeclareConstants = false;

  @Override
  @NotNull
  public String getDisplayName() {
    return InspectionGadgetsBundle.message(
      "interface.never.implemented.display.name");
  }

  @Override
  @Nullable
  public JComponent createOptionsPanel() {
    return new SingleCheckboxOptionsPanel(
      InspectionGadgetsBundle.message(
        "interface.never.implemented.option"), this,
      "ignoreInterfacesThatOnlyDeclareConstants");
  }

  @Override
  @NotNull
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message(
      "interface.never.implemented.problem.descriptor");
  }

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

  private class InterfaceNeverImplementedVisitor
    extends BaseInspectionVisitor {

    @Override
    public void visitClass(@NotNull PsiClass aClass) {
      if (!aClass.isInterface() || aClass.isAnnotationType()) {
        return;
      }
      if (ignoreInterfacesThatOnlyDeclareConstants &&
          aClass.getMethods().length == 0) {
        if (aClass.getFields().length != 0) {
          return;
        }
      }
      if (InheritanceUtil.hasImplementation(aClass)) {
        return;
      }
      registerClassError(aClass);
    }
  }
}