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      1 /*
      2  * Copyright (C) 2009 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect;
     18 
     19 import com.google.gwt.user.client.rpc.SerializationException;
     20 import com.google.gwt.user.client.rpc.SerializationStreamReader;
     21 import com.google.gwt.user.client.rpc.SerializationStreamWriter;
     22 import com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase;
     23 
     24 import java.util.LinkedHashMap;
     25 import java.util.Map;
     26 
     27 /**
     28  * This class implements the GWT serialization of {@link RegularImmutableMap}.
     29  *
     30  * @author Hayward Chan
     31  */
     32 public class RegularImmutableMap_CustomFieldSerializer {
     33 
     34   public static void deserialize(SerializationStreamReader reader,
     35       RegularImmutableMap<?, ?> instance) {
     36   }
     37 
     38   public static RegularImmutableMap<Object, Object> instantiate(
     39       SerializationStreamReader reader) throws SerializationException {
     40     Map<Object, Object> entries = new LinkedHashMap<Object, Object>();
     41     Map_CustomFieldSerializerBase.deserialize(reader, entries);
     42     /*
     43      * For this custom field serializer to be invoked, the map must have been
     44      * RegularImmutableMap before it's serialized.  Since RegularImmutableMap
     45      * always have two or more elements, ImmutableMap.copyOf always return
     46      * a RegularImmutableMap back.
     47      */
     48     return (RegularImmutableMap<Object, Object>) ImmutableMap.copyOf(entries);
     49   }
     50 
     51   public static void serialize(SerializationStreamWriter writer,
     52       RegularImmutableMap<?, ?> instance) throws SerializationException {
     53     Map_CustomFieldSerializerBase.serialize(writer, instance);
     54   }
     55 }
     56