| /* |
| * 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 edu.uci.ics.asterix.metadata.MetadataException; |
| import edu.uci.ics.asterix.metadata.api.IMetadataEntityTupleTranslator; |
| import edu.uci.ics.asterix.metadata.api.IValueExtractor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| |
| /** |
| * Extracts a metadata entity object from an ITupleReference. |
| */ |
| public class MetadataEntityValueExtractor<T> implements IValueExtractor<T> { |
| private final IMetadataEntityTupleTranslator<T> tupleReaderWriter; |
| |
| public MetadataEntityValueExtractor(IMetadataEntityTupleTranslator<T> tupleReaderWriter) { |
| this.tupleReaderWriter = tupleReaderWriter; |
| } |
| |
| @Override |
| public T getValue(long txnId, ITupleReference tuple) throws MetadataException, HyracksDataException, IOException { |
| return tupleReaderWriter.getMetadataEntytiFromTuple(tuple); |
| } |
| } |