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// Protocol Buffers - Google's data interchange format
// Copyright 2013 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
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.google.protobuf.nano;
import java.util.HashMap;
import java.util.Map;
/**
* Utility class for maps support.
*/
public final class MapFactories {
public static interface MapFactory {
<K, V> Map<K, V> forMap(Map<K, V> oldMap);
}
// NOTE(liujisi): The factory setter is temporarily marked as package private.
// The way to provide customized implementations of maps for different
// platforms are still under discussion. Mark it as private to avoid exposing
// the API in proto3 alpha release.
/* public */ static void setMapFactory(MapFactory newMapFactory) {
mapFactory = newMapFactory;
}
public static MapFactory getMapFactory() {
return mapFactory;
}
private static class DefaultMapFactory implements MapFactory {
public <K, V> Map<K, V> forMap(Map<K, V> oldMap) {
if (oldMap == null) {
return new HashMap<K, V>();
}
return oldMap;
}
}
private static volatile MapFactory mapFactory = new DefaultMapFactory();
private MapFactories() {}
}
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