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.column.tuple;
  
  import org.apache.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
  import org.apache.hyracks.dataflow.common.data.accessors.ITupleReference;
  
  public class AssembledTupleReference implements ITupleReference {
      private final int fieldCount;
      private final int[] offsets;
      private final int[] lengths;
      private byte[] data;
  
      public AssembledTupleReference(int fieldCount) {
          this.fieldCount = fieldCount;
          offsets = new int[fieldCount];
          lengths = new int[fieldCount];
      }
  
      public ITupleReference reset(ArrayTupleBuilder tb) {
          data = tb.getByteArray();
          int[] fieldEndOffsets = tb.getFieldEndOffsets();
  
          int j = fieldEndOffsets.length - 1;
          for (int i = fieldCount - 1; i >= 0; i--) {
              offsets[i] = j == 0 ? 0 : fieldEndOffsets[j - 1];
              lengths[i] = fieldEndOffsets[j] - offsets[i];
              j--;
          }
          return this;
      }
  
      @Override
      public int getFieldCount() {
          return fieldCount;
      }
  
      @Override
      public byte[] getFieldData(int fIdx) {
          return data;
      }
  
      @Override
      public int getFieldStart(int fIdx) {
          return offsets[fIdx];
      }
  
      @Override
      public int getFieldLength(int fIdx) {
          return lengths[fIdx];
      }
  }
  