/*
* 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.block;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockEncodingSerde;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
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 io.airlift.slice.DynamicSliceOutput;
import io.airlift.slice.SliceOutput;
import io.airlift.slice.Slices;
import javax.inject.Inject;
import java.io.IOException;
import java.util.Base64;
import static com.facebook.presto.block.BlockSerdeUtil.readBlock;
import static com.facebook.presto.block.BlockSerdeUtil.writeBlock;
import static java.util.Objects.requireNonNull;
public final class BlockJsonSerde
{
private BlockJsonSerde() {}
public static class Serializer
extends JsonSerializer<Block>
{
private final BlockEncodingSerde blockEncodingSerde;
@Inject
public Serializer(BlockEncodingSerde blockEncodingSerde)
{
this.blockEncodingSerde = requireNonNull(blockEncodingSerde, "blockEncodingSerde is null");
}
@Override
public void serialize(Block block, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
throws IOException
{
SliceOutput output = new DynamicSliceOutput(64);
writeBlock(blockEncodingSerde, output, block);
String encoded = Base64.getEncoder().encodeToString(output.slice().getBytes());
jsonGenerator.writeString(encoded);
}
}
public static class Deserializer
extends JsonDeserializer<Block>
{
private final BlockEncodingSerde blockEncodingSerde;
@Inject
public Deserializer(BlockEncodingSerde blockEncodingSerde)
{
this.blockEncodingSerde = requireNonNull(blockEncodingSerde, "blockEncodingSerde is null");
}
@Override
public Block deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException
{
byte[] decoded = Base64.getDecoder().decode(jsonParser.readValueAs(String.class));
return readBlock(blockEncodingSerde, Slices.wrappedBuffer(decoded));
}
}
}