/*
* Copyright 2010 Proofpoint, 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.facebook.presto.jdbc.internal.airlift.json;
import com.facebook.presto.jdbc.internal.jackson.databind.ObjectMapper;
import com.facebook.presto.jdbc.internal.guava.base.Preconditions;
import com.facebook.presto.jdbc.internal.guava.reflect.TypeParameter;
import com.facebook.presto.jdbc.internal.guava.reflect.TypeToken;
import com.facebook.presto.jdbc.internal.inject.Inject;
import com.facebook.presto.jdbc.internal.inject.Provider;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import static com.facebook.presto.jdbc.internal.jackson.databind.SerializationFeature.INDENT_OUTPUT;
public class JsonCodecFactory
{
private final Provider<ObjectMapper> objectMapperProvider;
private final boolean prettyPrint;
public JsonCodecFactory()
{
this(new ObjectMapperProvider());
}
@Inject
public JsonCodecFactory(Provider<ObjectMapper> objectMapperProvider)
{
this(objectMapperProvider, false);
}
public JsonCodecFactory(Provider<ObjectMapper> objectMapperProvider, boolean prettyPrint)
{
this.objectMapperProvider = objectMapperProvider;
this.prettyPrint = prettyPrint;
}
public JsonCodecFactory prettyPrint()
{
return new JsonCodecFactory(objectMapperProvider, true);
}
public <T> JsonCodec<T> jsonCodec(Class<T> type)
{
Preconditions.checkNotNull(type, "type is null");
return new JsonCodec<>(createObjectMapper(), type);
}
public <T> JsonCodec<T> jsonCodec(Type type)
{
Preconditions.checkNotNull(type, "type is null");
return new JsonCodec<>(createObjectMapper(), type);
}
public <T> JsonCodec<T> jsonCodec(TypeToken<T> type)
{
Preconditions.checkNotNull(type, "type is null");
return new JsonCodec<>(createObjectMapper(), type.getType());
}
public <T> JsonCodec<List<T>> listJsonCodec(Class<T> type)
{
Preconditions.checkNotNull(type, "type is null");
Type listType = new TypeToken<List<T>>() {}
.where(new TypeParameter<T>() {}, type)
.getType();
return new JsonCodec<>(createObjectMapper(), listType);
}
public <T> JsonCodec<List<T>> listJsonCodec(JsonCodec<T> type)
{
Preconditions.checkNotNull(type, "type is null");
Type listType = new TypeToken<List<T>>() {}
.where(new TypeParameter<T>() {}, type.getTypeToken())
.getType();
return new JsonCodec<>(createObjectMapper(), listType);
}
public <K, V> JsonCodec<Map<K, V>> mapJsonCodec(Class<K> keyType, Class<V> valueType)
{
Preconditions.checkNotNull(keyType, "keyType is null");
Preconditions.checkNotNull(valueType, "valueType is null");
Type mapType = new TypeToken<Map<K, V>>() {}
.where(new TypeParameter<K>() {}, keyType)
.where(new TypeParameter<V>() {}, valueType)
.getType();
return new JsonCodec<>(createObjectMapper(), mapType);
}
public <K, V> JsonCodec<Map<K, V>> mapJsonCodec(Class<K> keyType, JsonCodec<V> valueType)
{
Preconditions.checkNotNull(keyType, "keyType is null");
Preconditions.checkNotNull(valueType, "valueType is null");
Type mapType = new TypeToken<Map<K, V>>() {}
.where(new TypeParameter<K>() {}, keyType)
.where(new TypeParameter<V>() {}, valueType.getTypeToken())
.getType();
return new JsonCodec<>(createObjectMapper(), mapType);
}
private ObjectMapper createObjectMapper()
{
ObjectMapper objectMapper = null;
// Work around for http://code.google.com/p/google-guice/issues/detail?id=627
RuntimeException lastException = null;
for (int i = 0; objectMapper == null && i < 10; i++) {
try {
objectMapper = objectMapperProvider.get();
}
catch (RuntimeException e) {
lastException = e;
}
}
if (objectMapper == null) {
throw lastException;
}
if (prettyPrint) {
objectMapper.enable(INDENT_OUTPUT);
}
else {
objectMapper.disable(INDENT_OUTPUT);
}
return objectMapper;
}
}