_SqlIndexIterator


1   package com.daffodilwoods.daffodildb.server.datasystem.interfaces;
2   
3   import com.daffodilwoods.database.resource.DException;
4   import com.daffodilwoods.daffodildb.server.sql99.utils._IndexPredicate;
5   import com.daffodilwoods.daffodildb.server.sql99.common._KeyColumnInformation;
6   import com.daffodilwoods.daffodildb.server.sql99.utils._Reference;
7   import com.daffodilwoods.daffodildb.utils.field.FieldBase;
8   
9   public interface _SqlIndexIterator {
10      /**
11       * Used to search the particular record from the table while traversing from top to bottom
12       * @param condition Condition on which the search is made.
13       * @return true if that record is found in the table
14       * @throws DException
15       */
16      boolean seekFromTop(_IndexPredicate[] condition) throws DException;
17  
18      /**
19       * Used to search the particular record from the table while traversing from top to bottom
20       * @param condition Condition on which the search is made.
21       * @return true if the record or a record close to that record is found.
22       * @throws DException
23       */
24      boolean seekFromTopRelative( Object   indexKey ) throws DException;
25  
26      /**
27       * Used to search a record in the table while traversing from bottom to top.
28       * @param condition Condition on which the search is made.
29       * @return true if the record is found in the table
30       * @throws DException
31       */
32      boolean seekFromBottom(_IndexPredicate[] condition ) throws DException;
33  
34      /**
35       * Used to search a record from the table while traversing from bottom to top
36       * @param condition Condition on which the search is made.
37       * @return true if the record or a record close to that record is found in the table.
38       * @throws DException
39       */
40      boolean seekFromBottomRelative( Object   indexKey  ) throws DException;
41  
42      _KeyColumnInformation[] getKeyColumnInformations() throws DException;
43  
44      Object  [] getUniqueColumnReference() throws DException;
45  
46      boolean seek(Object   indexKey) throws DException;
47  
48      /**
49       * These method of getColumnValues return the value of the passed references
50       * in the form of Wrapper Java objects(Number/String/Date etc).
51       * @param reference
52       * @return
53       * @throws DException
54       */
55      Object   getColumnValues(_Reference[] reference) throws DException;
56      Object   getColumnValues(_Reference reference) throws DException;
57  
58  
59      /**
60       * This method return the shared FieldBase for the passed reference. By Shared
61       * FieldBase we mean, the FieldBase object for all row of a column of a table
62       * is same, just the bufferRange inside it is changed according to current
63       * record.
64       * @param reference
65       * @return
66       * @throws DException
67       */
68  
69      FieldBase field(_Reference reference) throws com.daffodilwoods.database.resource.DException ;
70      FieldBase[] fields(_Reference[] references) throws com.daffodilwoods.database.resource.DException ;
71  
72      public FieldBase[] fields(int[] columns) throws com.daffodilwoods.database.resource.DException ;
73  }
74
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