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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019, 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.internal;
import static org.junit.Assert.assertEquals;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.TypeAdapter;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import lombok.ToString;
import org.junit.Before;
import org.junit.Test;
public class JacksonTypeAdapterTest {
private static final String HELLO = "hello";
private static final String WORLD = "world";
/**
* Gson object that excludes fields, as we're going to process the fields ourselves.
*/
private static Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
private JacksonTypeAdapter<Data> adapter;
private List<Serializer> sers;
private List<Deserializer> desers;
/**
* Initializes the previously defined fields.
*/
@Before
public void setUp() {
// create list of serializers, one for "id" and one for "value"
sers = new ArrayList<>(2);
sers.add(new NamedSer(HELLO) {
@Override
protected String getValue(Data data) {
return data.id;
}
});
sers.add(new NamedSer(WORLD) {
@Override
protected String getValue(Data data) {
return data.value;
}
});
// create list of deserializers, one for "id" and one for "value"
desers = new ArrayList<>(2);
desers.add(new NamedDeser(HELLO) {
@Override
protected void setValue(Data data, String value) {
data.id = value;
}
});
desers.add(new NamedDeser(WORLD) {
@Override
protected void setValue(Data data, String value) {
data.value = value;
}
});
TypeAdapter<Data> delegate = gson.getDelegateAdapter(null, TypeToken.get(Data.class));
adapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
}
@Test
public void testWriteJsonWriterT() throws Exception {
Data data = new Data("abc", "def");
StringWriter wtr = new StringWriter();
adapter.write(new JsonWriter(wtr), data);
assertEquals("{'hello':'abc','world':'def'}".replace('\'', '"'), wtr.toString());
}
/**
* Tests the case where the delegate does not return a JsonObject.
*
* @throws Exception if an error occurs
*/
@Test
public void testWriteJsonWriterT_NotAnObject() throws Exception {
TypeAdapter<String> delegate = gson.getAdapter(String.class);
JacksonTypeAdapter<String> stringAdapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
StringWriter wtr = new StringWriter();
stringAdapter.write(new JsonWriter(wtr), "write text");
assertEquals("'write text'".replace('\'', '"'), wtr.toString());
}
@Test
public void testReadJsonReader() throws Exception {
Data data = adapter
.read(new JsonReader(new StringReader("{'hello':'four','world':'score'}".replace('\'', '"'))));
assertEquals(new Data("four", "score").toString(), data.toString());
}
/**
* Tests the case where the delegate does not use a JsonObject.
*
* @throws Exception if an error occurs
*/
@Test
public void testReadJsonReader_NotAnObject() throws Exception {
TypeAdapter<String> delegate = gson.getAdapter(String.class);
JacksonTypeAdapter<String> stringAdapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
String data = stringAdapter.read(new JsonReader(new StringReader("'read text'".replace('\'', '"'))));
assertEquals("read text", data);
}
@ToString
private static class Data {
private String id;
private String value;
/*
* This is invoked by gson via reflection, thus no direct invocation. Hence it has
* to be labeled "unused".
*/
@SuppressWarnings("unused")
public Data() {
super();
}
public Data(String id, String value) {
this.id = id;
this.value = value;
}
}
private abstract static class NamedSer implements Serializer {
private final String name;
/**
* Constructs the object.
*
* @param name the name of the field, when stored in a JsonObject
*/
public NamedSer(String name) {
this.name = name;
}
@Override
public void addToTree(Object source, JsonObject target) {
Data data = (Data) source;
target.addProperty(name, getValue(data));
}
protected abstract String getValue(Data data);
}
private abstract static class NamedDeser implements Deserializer {
private final String name;
/**
* Constructs the object.
*
* @param name the name of the field, when stored in a JsonObject
*/
public NamedDeser(String name) {
this.name = name;
}
@Override
public void getFromTree(JsonObject source, Object target) {
Data data = (Data) target;
setValue(data, source.get(name).getAsString());
}
protected abstract void setValue(Data data, String value);
}
}
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