/**
    * 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.hadoop.hbase.ipc;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.hadoop.hbase.Cell;
  import org.apache.hadoop.hbase.CellScannable;
  import org.apache.hadoop.hbase.CellScanner;
  import org.apache.hadoop.hbase.testclassification.ClientTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({ ClientTests.class, SmallTests.class })
  public class TestHBaseRpcControllerImpl {
    @Test
    public void testListOfCellScannerables() throws IOException {
      List<CellScannable> cells = new ArrayList<CellScannable>();
      final int count = 10;
      for (int i = 0; i < count; i++) {
        cells.add(createCell(i));
      }
      HBaseRpcController controller = new HBaseRpcControllerImpl(cells);
      CellScanner cellScanner = controller.cellScanner();
      int index = 0;
      for (; cellScanner.advance(); index++) {
        Cell cell = cellScanner.current();
        byte[] indexBytes = Bytes.toBytes(index);
        assertTrue("" + index, Bytes.equals(indexBytes, 0, indexBytes.length, cell.getValueArray(),
          cell.getValueOffset(), cell.getValueLength()));
      }
      assertEquals(count, index);
    }
  
    /**
     * @param index the index of the cell to use as its value
     * @return A faked out 'Cell' that does nothing but return index as its value
     */
    static CellScannable createCell(final int index) {
      return new CellScannable() {
        @Override
        public CellScanner cellScanner() {
          return new CellScanner() {
            @Override
            public Cell current() {
              // Fake out a Cell. All this Cell has is a value that is an int in size and equal
              // to the above 'index' param serialized as an int.
              return new Cell() {
                private final int i = index;
  
                @Override
                public byte[] getRowArray() {
                  return null;
                }
  
                @Override
                public int getRowOffset() {
                  return 0;
                }
  
                @Override
                public short getRowLength() {
                  return 0;
                }
  
                @Override
                public byte[] getFamilyArray() {
                  return null;
                }
  
                @Override
                public int getFamilyOffset() {
                  return 0;
                }
  
                @Override
                public byte getFamilyLength() {
                 return 0;
               }
 
               @Override
               public byte[] getQualifierArray() {
                 return null;
               }
 
               @Override
               public int getQualifierOffset() {
                 return 0;
               }
 
               @Override
               public int getQualifierLength() {
                 return 0;
               }
 
               @Override
               public long getTimestamp() {
                 return 0;
               }
 
               @Override
               public byte getTypeByte() {
                 return 0;
               }
 
               @Override
               public long getSequenceId() {
                 return 0;
               }
 
               @Override
               public byte[] getValueArray() {
                 return Bytes.toBytes(this.i);
               }
 
               @Override
               public int getValueOffset() {
                 return 0;
               }
 
               @Override
               public int getValueLength() {
                 return Bytes.SIZEOF_INT;
               }
 
               @Override
               public int getTagsOffset() {
                 return 0;
               }
 
               @Override
               public int getTagsLength() {
                 return 0;
               }
 
               @Override
               public byte[] getTagsArray() {
                 return null;
               }
 
               @Override
               public long getMvccVersion() {
                 return 0;
               }
 
               @Override
               public byte[] getValue() {
                 return Bytes.toBytes(this.i);
               }
 
               @Override
               public byte[] getFamily() {
                 return null;
               }
 
               @Override
               public byte[] getQualifier() {
                 return null;
               }
 
               @Override
               public byte[] getRow() {
                 return null;
               }
             };
           }
 
           private boolean hasCell = true;
 
           @Override
           public boolean advance() {
             // We have one Cell only so return true first time then false ever after.
             if (!hasCell) {
               return hasCell;
             }
 
             hasCell = false;
             return true;
           }
         };
       }
     };
   }
 }