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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.gson;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
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.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/**
* Adapter factory for Map<String,Object>. By default, GSON treats all Objects, that
* are numbers, as Double. This walks the map and converts Doubles to Integer or Long, if
* possible.
*/
public class MapDoubleAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (type.getRawType() != Map.class) {
return null;
}
Type[] actualParams = ((ParameterizedType) type.getType()).getActualTypeArguments();
// only supports Map<String,Object>
if (actualParams[0] != String.class || actualParams[1] != Object.class) {
return null;
}
TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
return new MapAdapter<T>(delegate);
}
/**
* Type adapter that performs conversion from Double to Integer/Long.
*
* @param <T> type of object on which this works (always Map.class)
*/
private static class MapAdapter<T> extends TypeAdapter<T> {
/**
* Used to perform conversion between JSON and Map<String,Object>.
*/
private final TypeAdapter<T> delegate;
/**
* Constructs the object.
*
* @param delegate JSON/Map converter
*/
public MapAdapter(TypeAdapter<T> delegate) {
this.delegate = delegate;
}
@Override
public void write(JsonWriter out, T value) throws IOException {
delegate.write(out, value);
}
@Override
public T read(JsonReader in) throws IOException {
T value = delegate.read(in);
@SuppressWarnings("rawtypes")
Map map = (Map) value;
convertFromDouble(map);
return value;
}
/**
* Performs conversion of all values in a map.
*
* @param map the map whose values are to be converted
*/
@SuppressWarnings("rawtypes")
private void convertFromDouble(Map map) {
@SuppressWarnings("unchecked")
Set<Entry> set = map.entrySet();
for (Entry entry : set) {
convertFromDouble(entry);
}
}
/**
* Converts an entry's value. If the value is a Map, then it recursively converts
* the entries of the map.
*
* @param entry entry whose value is to be converted
*/
@SuppressWarnings({"unchecked", "rawtypes"})
private void convertFromDouble(Entry entry) {
Object obj = entry.getValue();
if (obj instanceof Map) {
convertFromDouble((Map) obj);
return;
}
if (!(obj instanceof Double)) {
return;
}
Double num = (Double) obj;
long longval = num.longValue();
if (num.doubleValue() == longval) {
// it's integral - determine if it's an integer or a long
int intval = (int) longval;
if (intval == longval) {
// it fits in an integer
entry.setValue(intval);
} else {
// doesn't fit in an integer - must be a long
entry.setValue(longval);
}
}
}
}
}
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