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1 /*
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2 * Licensed to the Apache Software Foundation (ASF) under one or more
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3 * contributor license agreements. See the NOTICE file distributed with
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4 * this work for additional information regarding copyright ownership.
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5 * The ASF licenses this file to You under the Apache License, Version 2.0
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6 * (the "License"); you may not use this file except in compliance with
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7 * the License. You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package org.msgpack.util.android;
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19
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20 import java.io.Serializable;
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21 import java.util.Map;
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22
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23 /**
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24 * An immutable key-value mapping. Despite the name, this class is non-final
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25 * and its subclasses may be mutable.
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26 *
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27 * This class is ported from java.util.AbstractMap$SimpleImmutableEntry of
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28 * https://github.com/OESF/OHA-Android-4.0.3_r1.0 (Apache License).
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29 */
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30 public class PortedImmutableEntry<K, V> implements Map.Entry<K, V>, Serializable {
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31 private static final long serialVersionUID = -4564047655287765373L;
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32
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33 private final K key;
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34 private final V value;
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35
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36 public PortedImmutableEntry(K theKey, V theValue) {
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37 key = theKey;
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38 value = theValue;
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39 }
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40
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41 /**
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42 * Constructs an instance with the key and value of {@code copyFrom}.
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43 */
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44 public PortedImmutableEntry(Map.Entry<? extends K, ? extends V> copyFrom) {
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45 key = copyFrom.getKey();
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46 value = copyFrom.getValue();
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47 }
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48
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49 public K getKey() {
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50 return key;
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51 }
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52
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53 public V getValue() {
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54 return value;
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55 }
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56
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57 /**
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58 * This base implementation throws {@code UnsupportedOperationException}
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59 * always.
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60 */
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61 public V setValue(V object) {
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62 throw new UnsupportedOperationException();
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63 }
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64
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65 @Override public boolean equals(Object object) {
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66 if (this == object) {
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67 return true;
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68 }
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69 if (object instanceof Map.Entry) {
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70 Map.Entry<?, ?> entry = (Map.Entry<?, ?>) object;
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71 return (key == null ? entry.getKey() == null : key.equals(entry
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72 .getKey()))
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73 && (value == null ? entry.getValue() == null : value
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74 .equals(entry.getValue()));
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75 }
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76 return false;
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77 }
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78
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79 @Override public int hashCode() {
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80 return (key == null ? 0 : key.hashCode())
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81 ^ (value == null ? 0 : value.hashCode());
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82 }
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83
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84 @Override public String toString() {
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85 return key + "=" + value;
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86 }
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87 }
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