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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.KeyValue;
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<KeyValue> {
32  
33    public static ResultGenerator fromRowSpec(final String table, 
34        final RowSpec rowspec, final Filter filter) throws IOException {
35      if (rowspec.isSingleRow()) {
36        return new RowResultGenerator(table, rowspec, filter);
37      } else {
38        return new ScannerResultGenerator(table, rowspec, filter);
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(KeyValue kv);
47  
48    public abstract void close();
49  }