SynchronizationOnStaticFieldInspection.java

/*
 * Copyright 2010 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.threading;

import com.intellij.psi.*;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;

public class SynchronizationOnStaticFieldInspection extends BaseInspection {

  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return InspectionGadgetsBundle.message(
      "synchronization.on.static.field.display.name");
  }

  @NotNull
  @Override
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message(
      "synchronization.on.static.field.problem.descriptor");
  }

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

  private static class SynchronizationOnStaticFieldVisitor
    extends BaseInspectionVisitor {

    @Override
    public void visitSynchronizedStatement(
      PsiSynchronizedStatement statement) {
      super.visitSynchronizedStatement(statement);
      final PsiExpression lockExpression = statement.getLockExpression();
      if (!(lockExpression instanceof PsiReferenceExpression)) {
        return;
      }
      final PsiReferenceExpression expression =
        (PsiReferenceExpression)lockExpression;
      final PsiElement target = expression.resolve();
      if (!(target instanceof PsiField)) {
        return;
      }
      final PsiField field = (PsiField)target;
      if (!field.hasModifierProperty(PsiModifier.STATIC)) {
        return;
      }
      registerError(lockExpression);
    }
  }
}