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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2021 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.JsonParseException;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.util.function.Function;
/**
* GSON Type Adapter for fields that are encoded as Strings.
*/
public class StringTypeAdapter<T> extends TypeAdapter<T> {
private final String exMessage;
private final Function<String, T> deserializer;
private final Function<T, String> serializer;
/**
* Constructs an adapter.
*
* @param type type of value, used in exception messages
* @param deserializer function used to deserialize a String into a value
* @param serializer function used to serialize a value into a String
*/
public StringTypeAdapter(String type, Function<String, T> deserializer, Function<T, String> serializer) {
this.exMessage = "invalid " + type;
this.deserializer = deserializer;
this.serializer = serializer;
}
@Override
public T read(JsonReader in) throws IOException {
try {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
} else {
return deserializer.apply(in.nextString());
}
} catch (RuntimeException e) {
throw new JsonParseException(exMessage, e);
}
}
@Override
public void write(JsonWriter out, T value) throws IOException {
if (value == null) {
out.nullValue();
} else {
String text = serializer.apply(value);
out.value(text);
}
}
}
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