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1   /*
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.rest;
22  
23  import java.io.IOException;
24  import java.util.Iterator;
25   
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  public abstract class ResultGenerator implements Iterator<KeyValue> {
31  
32    public static ResultGenerator fromRowSpec(final String table, 
33        final RowSpec rowspec, final Filter filter) throws IOException {
34      if (rowspec.isSingleRow()) {
35        return new RowResultGenerator(table, rowspec, filter);
36      } else {
37        return new ScannerResultGenerator(table, rowspec, filter);
38      }
39    }
40  
41    public static Filter buildFilter(final String filter) throws Exception {
42      return ScannerModel.buildFilter(filter);
43    }
44  
45    public abstract void putBack(KeyValue kv);
46  
47    public abstract void close();
48  }