View Javadoc

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  package org.apache.hadoop.hbase.rest;
20  
21  import java.io.IOException;
22  import java.util.Iterator;
23  
24  import org.apache.hadoop.hbase.Cell;
25  import org.apache.hadoop.hbase.classification.InterfaceAudience;
26  import org.apache.hadoop.hbase.filter.Filter;
27  import org.apache.hadoop.hbase.rest.model.ScannerModel;
28  
29  @InterfaceAudience.Private
30  public abstract class ResultGenerator implements Iterator<Cell> {
31  
32    public static ResultGenerator fromRowSpec(final String table, 
33        final RowSpec rowspec, final Filter filter, final boolean cacheBlocks)
34        throws IOException {
35      if (rowspec.isSingleRow()) {
36        return new RowResultGenerator(table, rowspec, filter, cacheBlocks);
37      } else {
38        return new ScannerResultGenerator(table, rowspec, filter, cacheBlocks);
39      }
40    }
41  
42    public static Filter buildFilter(final String filter) throws Exception {
43      return ScannerModel.buildFilter(filter);
44    }
45  
46    public abstract void putBack(Cell kv);
47  
48    public abstract void close();
49  }