/*
* 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.plugin.jdbc;
import com.facebook.presto.spi.type.Type;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.deser.std.FromStringDeserializer;
import com.google.common.collect.ImmutableMap;
import io.airlift.json.JsonCodec;
import io.airlift.json.JsonCodecFactory;
import io.airlift.json.ObjectMapperProvider;
import java.util.Map;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
import static com.google.common.base.Preconditions.checkArgument;
import static org.testng.Assert.assertEquals;
final class MetadataUtil
{
private MetadataUtil() {}
public static final JsonCodec<JdbcColumnHandle> COLUMN_CODEC;
public static final JsonCodec<JdbcTableHandle> TABLE_CODEC;
public static final JsonCodec<JdbcOutputTableHandle> OUTPUT_TABLE_CODEC;
static {
ObjectMapperProvider provider = new ObjectMapperProvider();
provider.setJsonDeserializers(ImmutableMap.<Class<?>, JsonDeserializer<?>>of(Type.class, new TestingTypeDeserializer()));
JsonCodecFactory codecFactory = new JsonCodecFactory(provider);
COLUMN_CODEC = codecFactory.jsonCodec(JdbcColumnHandle.class);
TABLE_CODEC = codecFactory.jsonCodec(JdbcTableHandle.class);
OUTPUT_TABLE_CODEC = codecFactory.jsonCodec(JdbcOutputTableHandle.class);
}
public static final class TestingTypeDeserializer
extends FromStringDeserializer<Type>
{
private final Map<String, Type> types = ImmutableMap.<String, Type>of(
BIGINT.getName(), BIGINT,
VARCHAR.getName(), VARCHAR);
public TestingTypeDeserializer()
{
super(Type.class);
}
@Override
protected Type _deserialize(String value, DeserializationContext context)
{
Type type = types.get(value.toLowerCase());
checkArgument(type != null, "Unknown type %s", value);
return type;
}
}
public static <T> void assertJsonRoundTrip(JsonCodec<T> codec, T object)
{
String json = codec.toJson(object);
T copy = codec.fromJson(json);
assertEquals(copy, object);
}
}