diff options
Diffstat (limited to 'gson/src/main/java')
| -rw-r--r-- | gson/src/main/java/org/onap/policy/common/gson/DoubleConverter.java | 117 | ||||
| -rw-r--r-- | gson/src/main/java/org/onap/policy/common/gson/MapDoubleAdapterFactory.java | 90 |
2 files changed, 141 insertions, 66 deletions
diff --git a/gson/src/main/java/org/onap/policy/common/gson/DoubleConverter.java b/gson/src/main/java/org/onap/policy/common/gson/DoubleConverter.java new file mode 100644 index 00000000..81803ff2 --- /dev/null +++ b/gson/src/main/java/org/onap/policy/common/gson/DoubleConverter.java @@ -0,0 +1,117 @@ +/* + * ============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; + } +} diff --git a/gson/src/main/java/org/onap/policy/common/gson/MapDoubleAdapterFactory.java b/gson/src/main/java/org/onap/policy/common/gson/MapDoubleAdapterFactory.java index e56f9dd3..bd031999 100644 --- a/gson/src/main/java/org/onap/policy/common/gson/MapDoubleAdapterFactory.java +++ b/gson/src/main/java/org/onap/policy/common/gson/MapDoubleAdapterFactory.java @@ -29,33 +29,47 @@ import com.google.gson.stream.JsonWriter; import java.io.IOException; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; +import java.util.List; 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 + * Adapter factory for Map<String,Object> and List<String>. By default, GSON treats all Objects, that + * are numbers, as Double. This recursively walks a map/list 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) { + if (!isMapType(type) && !isListType(type)) { return null; } + TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type); + + return new MapAdapter<>(delegate); + } + + private <T> boolean isMapType(TypeToken<T> type) { + if (type.getRawType() != Map.class) { + return false; + } + Type[] actualParams = ((ParameterizedType) type.getType()).getActualTypeArguments(); // only supports Map<String,Object> - if (actualParams[0] != String.class || actualParams[1] != Object.class) { - return null; + return (actualParams[0] == String.class && actualParams[1] == Object.class); + } + + private <T> boolean isListType(TypeToken<T> type) { + if (type.getRawType() != List.class) { + return false; } - TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type); + Type[] actualParams = ((ParameterizedType) type.getType()).getActualTypeArguments(); - return new MapAdapter<>(delegate); + // only supports List<Object> + return (actualParams[0] == Object.class); } /** @@ -88,65 +102,9 @@ public class MapDoubleAdapterFactory implements TypeAdapterFactory { public T read(JsonReader in) throws IOException { T value = delegate.read(in); - @SuppressWarnings("rawtypes") - Map map = (Map) value; - - convertFromDouble(map); + DoubleConverter.convertFromDouble(value); 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 (Double.compare(num.doubleValue(), longval) == 0) { - // 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); - } - } - } } } |