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1   /*
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  
20  package org.apache.hadoop.hbase.rest;
21  
22  import java.io.IOException;
23  import java.util.Iterator;
24  
25  import org.apache.hadoop.classification.InterfaceAudience;
26  import org.apache.hadoop.hbase.Cell;
27  import org.apache.hadoop.hbase.filter.Filter;
28  import org.apache.hadoop.hbase.rest.model.ScannerModel;
29  
30  @InterfaceAudience.Private
31  public abstract class ResultGenerator implements Iterator<Cell> {
32  
33    public static ResultGenerator fromRowSpec(final String table, 
34        final RowSpec rowspec, final Filter filter, final boolean cacheBlocks)
35        throws IOException {
36      if (rowspec.isSingleRow()) {
37        return new RowResultGenerator(table, rowspec, filter, cacheBlocks);
38      } else {
39        return new ScannerResultGenerator(table, rowspec, filter, cacheBlocks);
40      }
41    }
42  
43    public static Filter buildFilter(final String filter) throws Exception {
44      return ScannerModel.buildFilter(filter);
45    }
46  
47    public abstract void putBack(Cell kv);
48  
49    public abstract void close();
50  }