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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.utils.coder;
import com.google.gson.JsonElement;
/**
* Object type used by the {@link StandardCoder}. Different serialization tools have
* different "standard objects". For instance, GSON uses {@link JsonElement}. This class
* wraps that object so that it can be used without exposing the object, itself.
*/
public class StandardCoderObject {
/**
* Data wrapped by this.
*/
private final JsonElement data;
/**
* Constructs the object.
*/
public StandardCoderObject() {
data = null;
}
/**
* Constructs the object.
*
* @param data data wrapped by this object.
*/
protected StandardCoderObject(JsonElement data) {
this.data = data;
}
/**
* Gets the data wrapped by this.
*
* @return the data wrapped by this
*/
protected JsonElement getData() {
return data;
}
/**
* Gets a field's value from this object, traversing the object hierarchy.
*
* @param fields field hierarchy
* @return the field value or {@code null} if the field does not exist or is not a
* primitive
*/
public String getString(String... fields) {
/*
* This could be relatively easily modified to allow Integer arguments, as well,
* which would be used to specify indices within an array.
*/
JsonElement jel = data;
for (String field : fields) {
if (jel == null) {
return null;
}
if (jel.isJsonObject()) {
jel = jel.getAsJsonObject().get(field);
} else {
return null;
}
}
return (jel != null && jel.isJsonPrimitive() ? jel.getAsString() : null);
}
}
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