/**
    * 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.replication;
  
  import java.util.NavigableMap;
  
  import org.apache.hadoop.hbase.Cell;
  import org.apache.hadoop.hbase.CellUtil;
  import org.apache.hadoop.hbase.HConstants;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
  import org.apache.hadoop.hbase.wal.WAL.Entry;
  
  import com.google.common.base.Predicate;
  
  /**
   * Keeps KVs that are scoped other than local
   */
  @InterfaceAudience.Private
  public class ScopeWALEntryFilter implements WALEntryFilter, WALCellFilter {
  
    BulkLoadCellFilter bulkLoadFilter = new BulkLoadCellFilter();
  
    @Override
    public Entry filter(Entry entry) {
      NavigableMap<byte[], Integer> scopes = entry.getKey().getScopes();
      if (scopes == null || scopes.isEmpty()) {
        return null;
      }
      return entry;
    }
  
    @Override
    public Cell filterCell(Entry entry, Cell cell) {
      final NavigableMap<byte[], Integer> scopes = entry.getKey().getScopes();
        // The scope will be null or empty if
        // there's nothing to replicate in that WALEdit
        byte[] fam = CellUtil.cloneFamily(cell);
        if (CellUtil.matchingColumn(cell, WALEdit.METAFAMILY, WALEdit.BULK_LOAD)) {
          cell = bulkLoadFilter.filterCell(cell, new Predicate<byte[]>() {
            @Override
            public boolean apply(byte[] fam) {
              return !scopes.containsKey(fam) || scopes.get(fam) == HConstants.REPLICATION_SCOPE_LOCAL;
            }
          });
        } else {
          if (!scopes.containsKey(fam) || scopes.get(fam) == HConstants.REPLICATION_SCOPE_LOCAL) {
            return null;
          }
        }
      return cell;
    }
  }