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1   /*
2    * Copyright (c) 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.hbql.mapping;
22  
23  import org.apache.hadoop.hbase.client.Result;
24  import org.apache.hadoop.hbase.hbql.client.HBqlException;
25  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
26  import org.apache.hadoop.hbase.hbql.statement.select.SelectElement;
27  
28  import java.io.Serializable;
29  import java.util.List;
30  
31  public abstract class ResultAccessor implements Serializable {
32  
33      private static final long serialVersionUID = 1L;
34  
35      private MappingContext mappingContext;
36  
37      public ResultAccessor() {
38      }
39  
40      public ResultAccessor(final MappingContext mappingContext) {
41          this.mappingContext = mappingContext;
42          this.getMappingContext().setResultAccessor(this);
43      }
44  
45      public MappingContext getMappingContext() {
46          return this.mappingContext;
47      }
48  
49      public Mapping getMapping() {
50          return this.getMappingContext().getMapping();
51      }
52  
53      public TableMapping getTableMapping() throws HBqlException {
54          return (TableMapping)this.getMapping();
55      }
56  
57      public abstract Object newObject(final HConnectionImpl conn,
58                                       final MappingContext mappingContext,
59                                       final List<SelectElement> selectElementList,
60                                       final int maxVersions,
61                                       final Result result) throws HBqlException;
62  
63      public ColumnAttrib getKeyAttrib() throws HBqlException {
64          return this.getMapping().getKeyAttrib();
65      }
66  
67      public abstract ColumnAttrib getColumnAttribByQualifiedName(String familyName,
68                                                                  String columnName) throws HBqlException;
69  
70      public abstract ColumnAttrib getColumnAttribByName(String name) throws HBqlException;
71  
72      public ColumnAttrib getVersionAttrib(String familyName, String columnName) throws HBqlException {
73          return this.getVersionAttrib(familyName + ":" + columnName);
74      }
75  
76      public abstract ColumnAttrib getVersionAttrib(String name) throws HBqlException;
77  }