_Navigator


1   package com.daffodilwoods.daffodildb.server.datasystem.interfaces;
2   
3   import com.daffodilwoods.database.resource.*;
4   import com.daffodilwoods.daffodildb.server.sql99.utils._Reference;
5   import com.daffodilwoods.daffodildb.server.datasystem.interfaces._DatabaseUser;
6   import com.daffodilwoods.daffodildb.server.datasystem.utility.*;
7   import com.daffodilwoods.daffodildb.utils.field.FieldBase;
8   
9   public interface _Navigator {
10      /**
11       * sets the current pointer to first record in the table.
12       * @return true if the first record exists in the table
13       * @throws DException
14       */
15      boolean first() throws DException;
16  
17      /**
18       * sets the current pointer of the iterator to the last record in the table
19       * @return true if the record is found in  the table.
20       * @throws DException
21       */
22      boolean last() throws DException;
23  
24      /**
25       * sets the current pointer of the iterator to the next record in te table
26       * @return true if nextrecord exists in the table.
27       * @throws DException
28       */
29      boolean next() throws DException;
30  
31      /**
32       * sets the current pointer of the iterator to the previous record in the table.
33       * @return true if the previous record exists in the table
34       * @throws DException
35       */
36      boolean previous() throws DException;
37  
38      /**
39       * used to retreive the current position of the iterator
40       * @return the current position of the iterator.
41       * @throws DException
42       */
43      Object   getKey() throws DException;
44  
45      /**
46       * Used to set the pointer of the iterator to the given position.
47       * @param key the key to which the pointer is to be moved.
48       * @throws DException
49       */
50      void move(Object   key) throws DException;
51  
52      /**
53       * Used to get the values of the record at the current position of the iterator.
54       * @param columns is an array of columns whose value is to be retreived
55       * @return an array of values of that record.
56       * @throws DException
57       */
58      _Record getRecord() throws DException;
59  
60  
61      Object   getColumnValues() throws DException;
62  
63  
64      Object   getColumnValues(int[] columns) throws DException;
65  
66  
67    public byte[] getByteKey() throws DException;
68  
69    public void moveByteKey(byte[] key) throws DException;
70  
71  }
72
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