content: /*
   * 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.valueextractors;
  
  import org.apache.asterix.common.transactions.TxnId;
  import org.apache.asterix.metadata.api.IMetadataEntityTupleTranslator;
  import org.apache.asterix.metadata.api.IValueExtractor;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.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(TxnId txnId, ITupleReference tuple) throws AlgebricksException, HyracksDataException {
          return tupleReaderWriter.getMetadataEntityFromTuple(tuple);
      }
  }
  