geode-core/src/main/java/org/apache/geode/internal/cache/DestroyedEntry.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.internal.cache;

import org.apache.geode.cache.CacheStatistics;
import org.apache.geode.cache.EntryDestroyedException;
import org.apache.geode.cache.Region;

/**
 * Represents a destroyed entry that can be returned from an <code>Iterator</code> instead of null.
 * All methods throw {@link EntryDestroyedException} except for {@link #isDestroyed()}.
 *
 */
public class DestroyedEntry implements Region.Entry<Object, Object> {
  private final String msg;

  public DestroyedEntry(String msg) {
    this.msg = msg;
  }

  @Override
  public Object getKey() {
    throw entryDestroyed();
  }

  @Override
  public Object getValue() {
    throw entryDestroyed();
  }

  @Override
  public Region<Object, Object> getRegion() {
    throw entryDestroyed();
  }

  @Override
  public boolean isLocal() {
    throw entryDestroyed();
  }

  @Override
  public CacheStatistics getStatistics() {
    throw entryDestroyed();
  }

  @Override
  public Object getUserAttribute() {
    throw entryDestroyed();
  }

  @Override
  public Object setUserAttribute(Object userAttribute) {
    throw entryDestroyed();
  }

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

  @Override
  public Object setValue(Object value) {
    throw entryDestroyed();
  }

  private EntryDestroyedException entryDestroyed() {
    return new EntryDestroyedException(msg);
  }
}