/*
 * Copyright 2000-2013 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.intellij.openapi.util.registry;

import com.intellij.openapi.Disposable;

/**
 * Listener for receiving notifications about registry value state changes.
 * Use {@link RegistryValue#addListener(RegistryValueListener, Disposable)} to register a listener.
 */
public interface RegistryValueListener {

  void beforeValueChanged(RegistryValue value);
  void afterValueChanged(RegistryValue value);

  class Adapter implements RegistryValueListener {
    @Override
    public void beforeValueChanged(RegistryValue value) {
    }

    @Override
    public void afterValueChanged(RegistryValue value) {
    }
  }

}