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com.facebook.config.CompositeJSONProvider Maven / Gradle / Ivy
/*
* Copyright (C) 2016 Facebook, 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 com.facebook.config;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
public class CompositeJSONProvider implements JSONProvider {
private final List jsonProviderList;
public CompositeJSONProvider(List jsonProviderList) {
this.jsonProviderList = jsonProviderList;
}
public CompositeJSONProvider(JSONProvider... jsonProviders) {
this(Arrays.asList(jsonProviders));
}
@Override
public JSONObject get() throws JSONException {
JSONObject mergedJsonObject = new JSONObject();
for (JSONProvider jsonProvider : jsonProviderList) {
JSONObject jsonObject = jsonProvider.get();
mergeInto(mergedJsonObject, jsonObject);
}
return mergedJsonObject;
}
private JSONObject mergeInto(JSONObject destinationJsonObject, JSONObject sourceJsonObject) throws JSONException {
Iterator keys = sourceJsonObject.keys();
while (keys.hasNext()) {
String sourceKey = (String) keys.next();
Object sourceValue = sourceJsonObject.get(sourceKey);
if (sourceValue instanceof JSONObject &&
destinationJsonObject.has(sourceKey) &&
destinationJsonObject.get(sourceKey) instanceof JSONObject
) {
destinationJsonObject.put(
sourceKey,
mergeInto((JSONObject) destinationJsonObject.get(sourceKey), (JSONObject) sourceValue)
);
} else {
destinationJsonObject.put(sourceKey, sourceValue);
}
}
return destinationJsonObject;
}
}