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/*
* Copyright (C) 2011 Google 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.google.gson.functional;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.lang.reflect.Type;
import junit.framework.TestCase;
public final class TypeAdapterPrecedenceTest extends TestCase {
public void testNonstreamingFollowedByNonstreaming() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Foo.class, newSerializer("serializer 1"))
.registerTypeAdapter(Foo.class, newSerializer("serializer 2"))
.registerTypeAdapter(Foo.class, newDeserializer("deserializer 1"))
.registerTypeAdapter(Foo.class, newDeserializer("deserializer 2"))
.create();
assertEquals("\"foo via serializer 2\"", gson.toJson(new Foo("foo")));
assertEquals("foo via deserializer 2", gson.fromJson("foo", Foo.class).name);
}
public void testStreamingFollowedByStreaming() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Foo.class, newTypeAdapter("type adapter 1"))
.registerTypeAdapter(Foo.class, newTypeAdapter("type adapter 2"))
.create();
assertEquals("\"foo via type adapter 2\"", gson.toJson(new Foo("foo")));
assertEquals("foo via type adapter 2", gson.fromJson("foo", Foo.class).name);
}
public void testSerializeNonstreamingTypeAdapterFollowedByStreamingTypeAdapter() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Foo.class, newSerializer("serializer"))
.registerTypeAdapter(Foo.class, newDeserializer("deserializer"))
.registerTypeAdapter(Foo.class, newTypeAdapter("type adapter"))
.create();
assertEquals("\"foo via type adapter\"", gson.toJson(new Foo("foo")));
assertEquals("foo via type adapter", gson.fromJson("foo", Foo.class).name);
}
public void testStreamingFollowedByNonstreaming() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Foo.class, newTypeAdapter("type adapter"))
.registerTypeAdapter(Foo.class, newSerializer("serializer"))
.registerTypeAdapter(Foo.class, newDeserializer("deserializer"))
.create();
assertEquals("\"foo via serializer\"", gson.toJson(new Foo("foo")));
assertEquals("foo via deserializer", gson.fromJson("foo", Foo.class).name);
}
public void testStreamingHierarchicalFollowedByNonstreaming() {
Gson gson = new GsonBuilder()
.registerTypeHierarchyAdapter(Foo.class, newTypeAdapter("type adapter"))
.registerTypeAdapter(Foo.class, newSerializer("serializer"))
.registerTypeAdapter(Foo.class, newDeserializer("deserializer"))
.create();
assertEquals("\"foo via serializer\"", gson.toJson(new Foo("foo")));
assertEquals("foo via deserializer", gson.fromJson("foo", Foo.class).name);
}
public void testStreamingFollowedByNonstreamingHierarchical() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Foo.class, newTypeAdapter("type adapter"))
.registerTypeHierarchyAdapter(Foo.class, newSerializer("serializer"))
.registerTypeHierarchyAdapter(Foo.class, newDeserializer("deserializer"))
.create();
assertEquals("\"foo via type adapter\"", gson.toJson(new Foo("foo")));
assertEquals("foo via type adapter", gson.fromJson("foo", Foo.class).name);
}
public void testStreamingHierarchicalFollowedByNonstreamingHierarchical() {
Gson gson = new GsonBuilder()
.registerTypeHierarchyAdapter(Foo.class, newSerializer("serializer"))
.registerTypeHierarchyAdapter(Foo.class, newDeserializer("deserializer"))
.registerTypeHierarchyAdapter(Foo.class, newTypeAdapter("type adapter"))
.create();
assertEquals("\"foo via type adapter\"", gson.toJson(new Foo("foo")));
assertEquals("foo via type adapter", gson.fromJson("foo", Foo.class).name);
}
public void testNonstreamingHierarchicalFollowedByNonstreaming() {
Gson gson = new GsonBuilder()
.registerTypeHierarchyAdapter(Foo.class, newSerializer("hierarchical"))
.registerTypeHierarchyAdapter(Foo.class, newDeserializer("hierarchical"))
.registerTypeAdapter(Foo.class, newSerializer("non hierarchical"))
.registerTypeAdapter(Foo.class, newDeserializer("non hierarchical"))
.create();
assertEquals("\"foo via non hierarchical\"", gson.toJson(new Foo("foo")));
assertEquals("foo via non hierarchical", gson.fromJson("foo", Foo.class).name);
}
private static class Foo {
final String name;
private Foo(String name) {
this.name = name;
}
}
private JsonSerializer<Foo> newSerializer(final String name) {
return new JsonSerializer<Foo>() {
public JsonElement serialize(Foo src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive(src.name + " via " + name);
}
};
}
private JsonDeserializer<Foo> newDeserializer(final String name) {
return new JsonDeserializer<Foo>() {
public Foo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
return new Foo(json.getAsString() + " via " + name);
}
};
}
private TypeAdapter<Foo> newTypeAdapter(final String name) {
return new TypeAdapter<Foo>() {
@Override public Foo read(JsonReader in) throws IOException {
return new Foo(in.nextString() + " via " + name);
}
@Override public void write(JsonWriter out, Foo value) throws IOException {
out.value(value.name + " via " + name);
}
};
}
}
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