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/*
* 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.asterix.metadata.entitytupletranslators;
import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import org.apache.asterix.common.exceptions.AsterixException;
import org.apache.asterix.formats.nontagged.AqlSerializerDeserializerProvider;
import org.apache.asterix.metadata.MetadataException;
import org.apache.asterix.metadata.bootstrap.MetadataPrimaryIndexes;
import org.apache.asterix.metadata.bootstrap.MetadataRecordTypes;
import org.apache.asterix.metadata.entities.CompactionPolicy;
import org.apache.asterix.om.base.ARecord;
import org.apache.asterix.om.base.AString;
import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
import org.apache.hyracks.dataflow.common.data.accessors.ITupleReference;
/**
* Translates a Dataset metadata entity to an ITupleReference and vice versa.
*/
public class CompactionPolicyTupleTranslator extends AbstractTupleTranslator<CompactionPolicy> {
// Field indexes of serialized CompactionPolicy in a tuple.
// Key field.
public static final int COMPACTION_POLICY_DATAVERSE_NAME_FIELD_INDEX = 0;
public static final int COMPACTION_POLICY_NAME_FIELD_INDEX = 1;
// Payload field containing serialized compactionPolicy.
public static final int COMPACTION_POLICY_PAYLOAD_TUPLE_FIELD_INDEX = 2;
@SuppressWarnings("unchecked")
private ISerializerDeserializer<ARecord> recordSerDes = AqlSerializerDeserializerProvider.INSTANCE
.getSerializerDeserializer(MetadataRecordTypes.COMPACTION_POLICY_RECORDTYPE);
public CompactionPolicyTupleTranslator(boolean getTuple) {
super(getTuple, MetadataPrimaryIndexes.COMPACTION_POLICY_DATASET.getFieldCount());
}
@Override
public CompactionPolicy getMetadataEntityFromTuple(ITupleReference tuple) throws IOException {
byte[] serRecord = tuple.getFieldData(COMPACTION_POLICY_PAYLOAD_TUPLE_FIELD_INDEX);
int recordStartOffset = tuple.getFieldStart(COMPACTION_POLICY_PAYLOAD_TUPLE_FIELD_INDEX);
int recordLength = tuple.getFieldLength(COMPACTION_POLICY_PAYLOAD_TUPLE_FIELD_INDEX);
ByteArrayInputStream stream = new ByteArrayInputStream(serRecord, recordStartOffset, recordLength);
DataInput in = new DataInputStream(stream);
ARecord compactionPolicyRecord = (ARecord) recordSerDes.deserialize(in);
return createCompactionPolicyFromARecord(compactionPolicyRecord);
}
private CompactionPolicy createCompactionPolicyFromARecord(ARecord compactionPolicyRecord) {
CompactionPolicy compactionPolicy = null;
String dataverseName = ((AString) compactionPolicyRecord
.getValueByPos(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_DATAVERSE_NAME_FIELD_INDEX))
.getStringValue();
String policyName = ((AString) compactionPolicyRecord
.getValueByPos(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_POLICY_NAME_FIELD_INDEX)).getStringValue();
String className = ((AString) compactionPolicyRecord
.getValueByPos(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_CLASSNAME_FIELD_INDEX)).getStringValue();
compactionPolicy = new CompactionPolicy(dataverseName, policyName, className);
return compactionPolicy;
}
@Override
public ITupleReference getTupleFromMetadataEntity(CompactionPolicy compactionPolicy) throws IOException,
MetadataException {
tupleBuilder.reset();
aString.setValue(compactionPolicy.getDataverseName());
stringSerde.serialize(aString, tupleBuilder.getDataOutput());
tupleBuilder.addFieldEndOffset();
aString.setValue(compactionPolicy.getPolicyName());
stringSerde.serialize(aString, tupleBuilder.getDataOutput());
tupleBuilder.addFieldEndOffset();
recordBuilder.reset(MetadataRecordTypes.COMPACTION_POLICY_RECORDTYPE);
// write field 0
fieldValue.reset();
aString.setValue(compactionPolicy.getDataverseName());
stringSerde.serialize(aString, fieldValue.getDataOutput());
recordBuilder.addField(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_DATAVERSE_NAME_FIELD_INDEX, fieldValue);
// write field 1
fieldValue.reset();
aString.setValue(compactionPolicy.getPolicyName());
stringSerde.serialize(aString, fieldValue.getDataOutput());
recordBuilder.addField(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_POLICY_NAME_FIELD_INDEX, fieldValue);
// write field 2
fieldValue.reset();
aString.setValue(compactionPolicy.getClassName());
stringSerde.serialize(aString, fieldValue.getDataOutput());
recordBuilder.addField(MetadataRecordTypes.COMPACTION_POLICY_ARECORD_CLASSNAME_FIELD_INDEX, fieldValue);
// write record
try {
recordBuilder.write(tupleBuilder.getDataOutput(), true);
} catch (AsterixException e) {
throw new MetadataException(e);
}
tupleBuilder.addFieldEndOffset();
tuple.reset(tupleBuilder.getFieldEndOffsets(), tupleBuilder.getByteArray());
return tuple;
}
}