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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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package com.google.protobuf;

import static com.google.protobuf.Internal.checkNotNull;

import com.google.protobuf.Internal.EnumLite;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

/**
 * Internal representation of map fields in generated lite-runtime messages.
 *
 * 

This class is a protobuf implementation detail. Users shouldn't use this class directly. */ public final class MapFieldLite extends LinkedHashMap { private boolean isMutable; private MapFieldLite() { this.isMutable = true; } private MapFieldLite(Map mapData) { super(mapData); this.isMutable = true; } @SuppressWarnings({"rawtypes", "unchecked"}) private static final MapFieldLite EMPTY_MAP_FIELD = new MapFieldLite<>(); static { EMPTY_MAP_FIELD.makeImmutable(); } /** Returns a singleton immutable empty MapFieldLite instance. */ @SuppressWarnings({"unchecked", "cast"}) public static MapFieldLite emptyMapField() { return (MapFieldLite) EMPTY_MAP_FIELD; } public void mergeFrom(MapFieldLite other) { ensureMutable(); if (!other.isEmpty()) { putAll(other); } } @SuppressWarnings({"unchecked", "cast"}) @Override public Set> entrySet() { return isEmpty() ? Collections.>emptySet() : super.entrySet(); } @Override public void clear() { ensureMutable(); super.clear(); } @Override public V put(K key, V value) { ensureMutable(); checkNotNull(key); checkNotNull(value); return super.put(key, value); } public V put(Map.Entry entry) { return put(entry.getKey(), entry.getValue()); } @Override public void putAll(Map m) { ensureMutable(); checkForNullKeysAndValues(m); super.putAll(m); } @Override public V remove(Object key) { ensureMutable(); return super.remove(key); } private static void checkForNullKeysAndValues(Map m) { for (Object key : m.keySet()) { checkNotNull(key); checkNotNull(m.get(key)); } } private static boolean equals(Object a, Object b) { if (a instanceof byte[] && b instanceof byte[]) { return Arrays.equals((byte[]) a, (byte[]) b); } return a.equals(b); } /** * Checks whether two {@link Map}s are equal. We don't use the default equals method of {@link * Map} because it compares by identity not by content for byte arrays. */ static boolean equals(Map a, Map b) { if (a == b) { return true; } if (a.size() != b.size()) { return false; } for (Map.Entry entry : a.entrySet()) { if (!b.containsKey(entry.getKey())) { return false; } if (!equals(entry.getValue(), b.get(entry.getKey()))) { return false; } } return true; } /** Checks whether two map fields are equal. */ @SuppressWarnings("unchecked") @Override public boolean equals(Object object) { return (object instanceof Map) && equals(this, (Map) object); } private static int calculateHashCodeForObject(Object a) { if (a instanceof byte[]) { return Internal.hashCode((byte[]) a); } // Enums should be stored as integers internally. if (a instanceof EnumLite) { throw new UnsupportedOperationException(); } return a.hashCode(); } /** * Calculates the hash code for a {@link Map}. We don't use the default hash code method of {@link * Map} because for byte arrays and protobuf enums it use {@link Object#hashCode()}. */ static int calculateHashCodeForMap(Map a) { int result = 0; for (Map.Entry entry : a.entrySet()) { result += calculateHashCodeForObject(entry.getKey()) ^ calculateHashCodeForObject(entry.getValue()); } return result; } @Override public int hashCode() { return calculateHashCodeForMap(this); } private static Object copy(Object object) { if (object instanceof byte[]) { byte[] data = (byte[]) object; return Arrays.copyOf(data, data.length); } return object; } /** * Makes a deep copy of a {@link Map}. Immutable objects in the map will be shared (e.g., * integers, strings, immutable messages) and mutable ones will have a copy (e.g., byte arrays, * mutable messages). */ @SuppressWarnings("unchecked") static Map copy(Map map) { Map result = new LinkedHashMap(); for (Map.Entry entry : map.entrySet()) { result.put(entry.getKey(), (V) copy(entry.getValue())); } return result; } /** Returns a deep copy of this map field. */ public MapFieldLite mutableCopy() { return isEmpty() ? new MapFieldLite() : new MapFieldLite(this); } /** * Makes this field immutable. All subsequent modifications will throw an {@link * UnsupportedOperationException}. */ public void makeImmutable() { isMutable = false; } /** Returns whether this field can be modified. */ public boolean isMutable() { return isMutable; } private void ensureMutable() { if (!isMutable()) { throw new UnsupportedOperationException(); } } }





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