| /* |
| * 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.kafka.common.utils; |
| |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| /** |
| * An ordered map (LinkedHashMap) implementation for which the order is immutable. |
| * To accomplish this, all methods of removing mappings are disabled (they are marked |
| * deprecated and throw an exception). |
| * |
| * This class is final to prevent subclasses from violating the desired property. |
| * |
| * @param <K> The key type |
| * @param <V> The value type |
| */ |
| public final class FixedOrderMap<K, V> extends LinkedHashMap<K, V> { |
| private static final long serialVersionUID = -6504110858733236170L; |
| |
| @Deprecated |
| @Override |
| protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) { |
| return false; |
| } |
| |
| @Deprecated |
| @Override |
| public V remove(final Object key) { |
| throw new UnsupportedOperationException("Removing from registeredStores is not allowed"); |
| } |
| |
| @Deprecated |
| @Override |
| public boolean remove(final Object key, final Object value) { |
| throw new UnsupportedOperationException("Removing from registeredStores is not allowed"); |
| } |
| |
| @Deprecated |
| @Override |
| public void clear() { |
| throw new UnsupportedOperationException("Removing from registeredStores is not allowed"); |
| } |
| |
| @Override |
| public FixedOrderMap<K, V> clone() { |
| throw new UnsupportedOperationException(); |
| } |
| } |