| /* |
| * Copyright 2009-2010 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.valueextractors; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.asterix.metadata.MetadataException; |
| import edu.uci.ics.asterix.metadata.api.IValueExtractor; |
| import edu.uci.ics.asterix.transaction.management.service.transaction.JobId; |
| import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleReference; |
| import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleWriter; |
| |
| /** |
| * Returns a copy of the given input tuple. |
| */ |
| public class TupleCopyValueExtractor implements IValueExtractor<ITupleReference> { |
| private final TypeAwareTupleWriter tupleWriter; |
| private final TypeAwareTupleReference tupleReference; |
| // TODO: Try avoid reallocating the tupleBytes. |
| // TODO: Get rid of the ByteBuffer by chancing the TypeAwareTupleReference |
| // reset() interface. |
| private byte[] tupleBytes; |
| private ByteBuffer buf; |
| |
| public TupleCopyValueExtractor(ITypeTraits[] typeTraits) { |
| this.tupleWriter = new TypeAwareTupleWriter(typeTraits); |
| this.tupleReference = (TypeAwareTupleReference) tupleWriter.createTupleReference(); |
| } |
| |
| @Override |
| public ITupleReference getValue(JobId jobId, ITupleReference tuple) throws MetadataException, HyracksDataException, |
| IOException { |
| int numBytes = tupleWriter.bytesRequired(tuple); |
| tupleBytes = new byte[numBytes]; |
| tupleWriter.writeTuple(tuple, tupleBytes, 0); |
| buf = ByteBuffer.wrap(tupleBytes); |
| tupleReference.resetByTupleOffset(buf, 0); |
| return tupleReference; |
| } |
| } |