| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.asterix.metadata.entitytupletranslators; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInput; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.util.Calendar; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.metadata.MetadataException; |
| import edu.uci.ics.asterix.metadata.bootstrap.MetadataPrimaryIndexes; |
| import edu.uci.ics.asterix.metadata.bootstrap.MetadataRecordTypes; |
| import edu.uci.ics.asterix.metadata.entities.Library; |
| import edu.uci.ics.asterix.om.base.ARecord; |
| import edu.uci.ics.asterix.om.base.AString; |
| import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| |
| /** |
| * Translates a Library metadata entity to an ITupleReference and vice versa. |
| */ |
| public class LibraryTupleTranslator extends AbstractTupleTranslator<Library> { |
| // Field indexes of serialized Library in a tuple. |
| // First key field. |
| public static final int LIBRARY_DATAVERSENAME_TUPLE_FIELD_INDEX = 0; |
| // Second key field. |
| public static final int LIBRARY_NAME_TUPLE_FIELD_INDEX = 1; |
| |
| // Payload field containing serialized Library. |
| public static final int LIBRARY_PAYLOAD_TUPLE_FIELD_INDEX = 2; |
| |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ARecord> recordSerDes = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(MetadataRecordTypes.LIBRARY_RECORDTYPE); |
| |
| public LibraryTupleTranslator(boolean getTuple) { |
| super(getTuple, MetadataPrimaryIndexes.LIBRARY_DATASET.getFieldCount()); |
| } |
| |
| @Override |
| public Library getMetadataEntytiFromTuple(ITupleReference frameTuple) throws IOException { |
| byte[] serRecord = frameTuple.getFieldData(LIBRARY_PAYLOAD_TUPLE_FIELD_INDEX); |
| int recordStartOffset = frameTuple.getFieldStart(LIBRARY_PAYLOAD_TUPLE_FIELD_INDEX); |
| int recordLength = frameTuple.getFieldLength(LIBRARY_PAYLOAD_TUPLE_FIELD_INDEX); |
| ByteArrayInputStream stream = new ByteArrayInputStream(serRecord, recordStartOffset, recordLength); |
| DataInput in = new DataInputStream(stream); |
| ARecord libraryRecord = (ARecord) recordSerDes.deserialize(in); |
| return createLibraryFromARecord(libraryRecord); |
| } |
| |
| private Library createLibraryFromARecord(ARecord libraryRecord) { |
| String dataverseName = ((AString) libraryRecord |
| .getValueByPos(MetadataRecordTypes.LIBRARY_ARECORD_DATAVERSENAME_FIELD_INDEX)).getStringValue(); |
| String libraryName = ((AString) libraryRecord |
| .getValueByPos(MetadataRecordTypes.LIBRARY_ARECORD_NAME_FIELD_INDEX)).getStringValue(); |
| |
| return new Library(dataverseName, libraryName); |
| } |
| |
| @Override |
| public ITupleReference getTupleFromMetadataEntity(Library library) throws IOException, MetadataException { |
| // write the key in the first 2 fields of the tuple |
| tupleBuilder.reset(); |
| aString.setValue(library.getDataverseName()); |
| stringSerde.serialize(aString, tupleBuilder.getDataOutput()); |
| tupleBuilder.addFieldEndOffset(); |
| aString.setValue(library.getName()); |
| stringSerde.serialize(aString, tupleBuilder.getDataOutput()); |
| tupleBuilder.addFieldEndOffset(); |
| |
| // write the pay-load in the third field of the tuple |
| |
| recordBuilder.reset(MetadataRecordTypes.LIBRARY_RECORDTYPE); |
| |
| // write field 0 |
| fieldValue.reset(); |
| aString.setValue(library.getDataverseName()); |
| stringSerde.serialize(aString, fieldValue.getDataOutput()); |
| recordBuilder.addField(MetadataRecordTypes.LIBRARY_ARECORD_DATAVERSENAME_FIELD_INDEX, fieldValue); |
| |
| // write field 1 |
| fieldValue.reset(); |
| aString.setValue(library.getName()); |
| stringSerde.serialize(aString, fieldValue.getDataOutput()); |
| recordBuilder.addField(MetadataRecordTypes.LIBRARY_ARECORD_NAME_FIELD_INDEX, fieldValue); |
| |
| // write field 2 |
| fieldValue.reset(); |
| aString.setValue(Calendar.getInstance().getTime().toString()); |
| stringSerde.serialize(aString, fieldValue.getDataOutput()); |
| recordBuilder.addField(MetadataRecordTypes.LIBRARY_ARECORD_TIMESTAMP_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; |
| } |
| |
| } |