/* Copyright (c) 2012-2017 Jakub Białek
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.google.code.ssm.transcoders;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Test;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.google.code.ssm.mapper.JsonObjectMapper;
import com.google.code.ssm.providers.CachedObject;
import com.google.code.ssm.test.Point;
/**
*
* @author Jakub Białek
*
*/
public class JsonTranscoderTest {
private JsonTranscoder transcoder;
@Test
public void testEncodeAndDecode() {
transcoder = new JsonTranscoder(new JsonObjectMapper());
Point p = new Point(40, 50);
CachedObject co = transcoder.encode(p);
assertNotNull(co);
assertNotNull(co.getData());
Point p2 = (Point) transcoder.decode(co);
assertNotNull(p2);
assertEquals(p, p2);
}
@Test
public void testEncodeAndDecodeWithCustomSerializer() {
JsonObjectMapper mapper = new JsonObjectMapper();
Map<Class<?>, JsonSerializer<?>> serializers = new HashMap<Class<?>, JsonSerializer<?>>();
serializers.put(Point.class, new PointSerializer());
mapper.setSerializers(serializers);
transcoder = new JsonTranscoder(mapper);
Point p = new Point(40, 50);
// it won't be possible to deserialize it because no custom deserializer is registered and serialized data
// doesn't contain info about class (type of serialized object), so the Jackson cannot figure out what
// deserializer should be used
CachedObject co = transcoder.encode(p);
assertNotNull(co);
assertNotNull(co.getData());
assertEquals("{\"v\":\"40x50\"}", new String(co.getData()));
}
@Test
public void testEncodeAndDecodeRegisterSerializerDirectlyToModule() {
JsonObjectMapper mapper = new JsonObjectMapper();
// first add serializer then register module
SimpleModule module = new SimpleModule("cemo", Version.unknownVersion());
module.addSerializer(Point.class, new PointSerializer());
mapper.registerModule(module);
transcoder = new JsonTranscoder(mapper);
Point p = new Point(40, 50);
CachedObject co = transcoder.encode(p);
assertNotNull(co);
assertNotNull(co.getData());
assertEquals("{\"v\":\"40x50\"}", new String(co.getData()));
}
@Test
public void testEncodeAndDecodeWithCustomSerializerAndDeserializerWithTypeInfoInside() {
JsonObjectMapper mapper = createMapper();
transcoder = new JsonTranscoder(mapper);
Point p = new Point(40, 50);
CachedObject co = transcoder.encode(p);
assertNotNull(co);
assertNotNull(co.getData());
assertEquals("{\"v\":{\"com.google.code.ssm.test.Point\":{\"c\":\"40x50\"}}}", new String(co.getData()));
Point p2 = (Point) transcoder.decode(co);
assertNotNull(p2);
assertEquals(p, p2);
}
@Test
public void testEncodeAndDecodeWithCustomSerializerAndDeserializerWithTypeInfoInsideAndShorterClassIdentifier() {
JsonObjectMapper mapper = createMapper();
mapper.setClassToId(Collections.<Class<?>, String> singletonMap(Point.class, "point"));
transcoder = new JsonTranscoder(mapper);
Point p = new Point(40, 50);
CachedObject co = transcoder.encode(p);
assertNotNull(co);
assertNotNull(co.getData());
assertEquals("{\"v\":{\"point\":{\"c\":\"40x50\"}}}", new String(co.getData()));
Point p2 = (Point) transcoder.decode(co);
assertNotNull(p2);
assertEquals(p, p2);
}
@Test
public void testEncodeAndDecodeListWithCustomSerializerAndDeserializerWithTypeInfoInsideAndShorterClassIdentifier() {
JsonObjectMapper mapper = createMapper();
mapper.setClassToId(Collections.<Class<?>, String> singletonMap(Point.class, "point"));
transcoder = new JsonTranscoder(mapper);
List<Point> list = Arrays.asList(new Point(40, 50), new Point(10, 50));
CachedObject co = transcoder.encode(list);
assertNotNull(co);
assertNotNull(co.getData());
assertEquals("{\"v\":{\"java.util.ArrayList\":[{\"point\":{\"c\":\"40x50\"}},{\"point\":{\"c\":\"10x50\"}}]}}",
new String(co.getData()));
@SuppressWarnings("unchecked")
List<Point> list2 = (List<Point>) transcoder.decode(co);
assertNotNull(list2);
assertEquals(list, list2);
}
private JsonObjectMapper createMapper() {
JsonObjectMapper mapper = new JsonObjectMapper();
Map<Class<?>, JsonSerializer<?>> serializers = new HashMap<Class<?>, JsonSerializer<?>>();
serializers.put(Point.class, new PointSerializerWithTypeInfo());
mapper.setSerializers(serializers);
Map<Class<?>, JsonDeserializer<?>> deserializers = new HashMap<Class<?>, JsonDeserializer<?>>();
deserializers.put(Point.class, new PointDeserializer());
mapper.setDeserializers(deserializers);
return mapper;
}
static class PointSerializer extends JsonSerializer<Point> {
@Override
public void serialize(final Point value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException {
jgen.writeString(value.getX() + "x" + value.getY());
}
@Override
public void serializeWithType(final Point value, final JsonGenerator jgen, final SerializerProvider provider,
final TypeSerializer typeSer) throws IOException, JsonProcessingException {
serialize(value, jgen, provider);
}
}
/**
* Stores information of Point type, it is used by Jackson to decide what deserializer should be used.
*
*/
static class PointSerializerWithTypeInfo extends JsonSerializer<Point> {
@Override
public void serialize(final Point value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException {
jgen.writeFieldName("c");
jgen.writeString(value.getX() + "x" + value.getY());
}
@Override
public void serializeWithType(final Point value, final JsonGenerator jgen, final SerializerProvider provider,
final TypeSerializer typeSer) throws IOException, JsonProcessingException {
typeSer.writeTypePrefixForObject(value, jgen);
serialize(value, jgen, provider);
typeSer.writeTypeSuffixForObject(value, jgen);
}
}
static class PointDeserializer extends JsonDeserializer<Point> {
@Override
public Point deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException, JsonProcessingException {
jp.nextToken();
String value = jp.nextTextValue();
jp.nextToken();
String[] parts = value.split("x");
return new Point(Integer.valueOf(parts[0]), Integer.valueOf(parts[1]));
}
}
}