/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hive.hcatalog.api;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.PartitionSpec;
import org.apache.hadoop.hive.metastore.api.Table;
import org.apache.hadoop.hive.metastore.partition.spec.PartitionSpecProxy;
import org.apache.hive.hcatalog.common.HCatException;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.TSerializer;
import org.apache.thrift.protocol.TJSONProtocol;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
/**
* MetadataSerializer implementation, that serializes HCat API elements into JSON.
*/
class MetadataJSONSerializer extends MetadataSerializer {
private static final Logger LOG = LoggerFactory.getLogger(MetadataJSONSerializer.class);
MetadataJSONSerializer() throws HCatException {}
@Override
public String serializeTable(HCatTable hcatTable) throws HCatException {
try {
return new TSerializer(new TJSONProtocol.Factory())
.toString(hcatTable.toHiveTable(), "UTF-8");
}
catch (TException exception) {
throw new HCatException("Could not serialize HCatTable: " + hcatTable, exception);
}
}
@Override
public HCatTable deserializeTable(String hcatTableStringRep) throws HCatException {
try {
Table table = new Table();
new TDeserializer(new TJSONProtocol.Factory()).deserialize(table, hcatTableStringRep, "UTF-8");
return new HCatTable(table);
}
catch(TException exception) {
if (LOG.isDebugEnabled())
LOG.debug("Could not de-serialize from: " + hcatTableStringRep);
throw new HCatException("Could not de-serialize HCatTable.", exception);
}
}
@Override
public String serializePartition(HCatPartition hcatPartition) throws HCatException {
try {
return new TSerializer(new TJSONProtocol.Factory())
.toString(hcatPartition.toHivePartition(), "UTF-8");
}
catch (TException exception) {
throw new HCatException("Could not serialize HCatPartition: " + hcatPartition, exception);
}
}
@Override
public HCatPartition deserializePartition(String hcatPartitionStringRep) throws HCatException {
try {
Partition partition = new Partition();
new TDeserializer(new TJSONProtocol.Factory()).deserialize(partition, hcatPartitionStringRep, "UTF-8");
return new HCatPartition(null, partition);
}
catch(TException exception) {
if (LOG.isDebugEnabled())
LOG.debug("Could not de-serialize partition from: " + hcatPartitionStringRep);
throw new HCatException("Could not de-serialize HCatPartition.", exception);
}
}
@Override
@InterfaceAudience.LimitedPrivate({"Hive"})
@InterfaceStability.Evolving
public List<String> serializePartitionSpec(HCatPartitionSpec hcatPartitionSpec) throws HCatException {
try {
List<String> stringReps = new ArrayList<String>();
TSerializer serializer = new TSerializer(new TJSONProtocol.Factory());
for (PartitionSpec partitionSpec : hcatPartitionSpec.partitionSpecProxy.toPartitionSpec()) {
stringReps.add(serializer.toString(partitionSpec, "UTF-8"));
}
return stringReps;
}
catch (TException serializationException) {
throw new HCatException("Failed to serialize!", serializationException);
}
}
@Override
public HCatPartitionSpec deserializePartitionSpec(List<String> hcatPartitionSpecStrings) throws HCatException {
try {
List<PartitionSpec> partitionSpecList = new ArrayList<PartitionSpec>();
TDeserializer deserializer = new TDeserializer(new TJSONProtocol.Factory());
for (String stringRep : hcatPartitionSpecStrings) {
PartitionSpec partSpec = new PartitionSpec();
deserializer.deserialize(partSpec, stringRep, "UTF-8");
partitionSpecList.add(partSpec);
}
return new HCatPartitionSpec(null, PartitionSpecProxy.Factory.get(partitionSpecList));
}
catch (TException deserializationException) {
throw new HCatException("Failed to deserialize!", deserializationException);
}
}
}