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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 java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/**
* Converter for Double values. By default, GSON treats all Objects that are numbers, as
* Double. This converts Doubles to Integer or Long, if possible. It converts stand-alone
* Doubles, as well as those found within Arrays and Maps.
*/
public class DoubleConverter {
private DoubleConverter() {
// do nothing
}
/**
* Performs in-place conversion of all values in a list.
*
* @param list the list whose values are to be converted
*/
public static void convertFromDouble(List<Object> list) {
if (list == null) {
return;
}
List<Object> original = new ArrayList<>(list);
list.clear();
original.forEach(item -> list.add(convertFromDouble(item)));
}
/**
* Performs in-place conversion of all values in a map.
*
* @param map the map whose values are to be converted
*/
public static void convertFromDouble(Map<String, Object> map) {
if (map == null) {
return;
}
Set<Entry<String, Object>> set = map.entrySet();
for (Entry<String, Object> entry : set) {
entry.setValue(convertFromDouble(entry.getValue()));
}
}
/**
* Converts a value. If the value is a List, then it recursively converts the
* entries of the List. Likewise with a map, however, the map is converted in place.
*
* @param value value to be converted
* @return the converted value
*/
@SuppressWarnings({"unchecked"})
public static Object convertFromDouble(Object value) {
if (value == null) {
return value;
}
if (value instanceof List) {
convertFromDouble((List<Object>) value);
return value;
}
if (value instanceof Map) {
convertFromDouble((Map<String, Object>) value);
return value;
}
if (!(value instanceof Double)) {
return value;
}
Double num = (Double) value;
long longval = num.longValue();
if (Double.compare(num.doubleValue(), longval) != 0) {
// it isn't integral - return unchanged value
return value;
}
// it's integral - determine if it's an integer or a long
int intval = (int) longval;
if (intval == longval) {
return intval;
}
return longval;
}
}
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