feign.gson.DoubleToIntMapTypeAdapter Maven / Gradle / Ivy
/*
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 feign.gson;
import com.google.gson.Gson;
import com.google.gson.InstanceCreator;
import com.google.gson.TypeAdapter;
import com.google.gson.internal.ConstructorConstructor;
import com.google.gson.internal.bind.MapTypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;
/**
* Deals with scenario where Gson Object type treats all numbers as doubles.
*/
public class DoubleToIntMapTypeAdapter extends TypeAdapter> {
final static TypeToken> token = new TypeToken>() {
};
private final TypeAdapter>
delegate =
new MapTypeAdapterFactory(new ConstructorConstructor(
Collections.>emptyMap()), false).create(new Gson(), token);
@Override
public void write(JsonWriter out, Map value) throws IOException {
delegate.write(out, value);
}
@Override
public Map read(JsonReader in) throws IOException {
Map map = delegate.read(in);
for (Map.Entry entry : map.entrySet()) {
if (entry.getValue() instanceof Double) {
entry.setValue(Double.class.cast(entry.getValue()).intValue());
}
}
return map;
}
}