ViewObject


1   package com.daffodilwoods.daffodildb.server.sql99.dql.plan.table;
2   
3   import com.daffodilwoods.daffodildb.server.datadictionarysystem.*;
4   import com.daffodilwoods.daffodildb.server.serversystem.*;
5   import com.daffodilwoods.daffodildb.server.sql99.common.*;
6   import com.daffodilwoods.daffodildb.server.sql99.dql.queryexpression.*;
7   import com.daffodilwoods.database.resource.*;
8   
9   /**
10   * It represents the definition of view.
11   * <p>Title: </p>
12   * <p>Description: </p>
13   * <p>Copyright: Copyright (c) 2003</p>
14   * <p>Company: </p>
15   * @author unascribed
16   * @version 1.0
17   */
18  
19  public class ViewObject implements _ViewObject {
20  
21     /**
22      * Represents the mapping of view's column name vs column used in view
23      * definition.
24      */
25  
26     private Object  [][] mappingOfColumnAndCD;
27  
28     /**
29      * Represents the definition of view.
30      */
31  
32     private queryexpression queryExpression;
33  
34     public ViewObject(queryexpression queryExpressionPassed) {
35        queryExpression = queryExpressionPassed;
36     }
37  
38     public ViewObject(queryexpression queryExpressionPassed, Object  [][] mappingOfColumnAndCD0) {
39        this(queryExpressionPassed);
40        mappingOfColumnAndCD = mappingOfColumnAndCD0;
41     }
42  
43     /**
44      * It is needed to get mapping of passed column name vs corresponding column
45      * used in view definition.
46      * @param viewColumnNames
47      * @return
48      * @throws DException
49      */
50  
51     public Object  [][] getMappingOfColumnsAndColumnDetails(String  [] viewColumnNames) throws DException {
52        if (mappingOfColumnAndCD != null) {
53           return mappingOfColumnAndCD;
54        }
55        int length = viewColumnNames.length;
56        ColumnDetails[] selectColumns = queryExpression.getSelectedColumns();
57        mappingOfColumnAndCD = new Object  [length][2];
58        for (int i = 0; i < length; ++i) {
59           mappingOfColumnAndCD[i][0] = viewColumnNames[i];
60           mappingOfColumnAndCD[i][1] = selectColumns[i];
61        }
62        return mappingOfColumnAndCD;
63     }
64  
65     /**
66      * Returns the mapping of view's column name vs column used in view
67      * definition.
68      * @return
69      * @throws DException
70      */
71  
72     public Object  [][] getMappingOfColumnsAndColumnDetails() throws DException {
73        return mappingOfColumnAndCD;
74     }
75  
76     /**
77      * Returns the object representing view definition.
78      * @return
79      */
80  
81     public queryexpression getQueryExpression() {
82        return queryExpression;
83     }
84  
85     /**
86      * Return the characteristics for Foriegn Constraints corresponding to passed
87      * column.
88      * @param columnName
89      * @param serverSession
90      * @param columnCharacteristics
91      * @return
92      * @throws DException
93      */
94  
95     public Object  [] getForeignConstraintCharacteritics(String   columnName, _ServerSession serverSession, _ColumnCharacteristics columnCharacteristics) throws DException {
96        if (mappingOfColumnAndCD == null) {
97           mappingOfColumnAndCD = getMappingOfColumnsAndColumnDetails(columnCharacteristics.getColumnNames());
98        }
99        for (int i = 0, length = mappingOfColumnAndCD.length; i < length; i++) {
100          if ( ( (String  ) mappingOfColumnAndCD[i][0]).equalsIgnoreCase(columnName)) {
101             ColumnDetails column = (ColumnDetails) mappingOfColumnAndCD[i][1];
102             _ColumnCharacteristics columnCHS = column.getTable().cc;
103             return serverSession.getForeignConstraintCharacteritics(column.getTable().getQualifiedIdentifier(), column.getAppropriateColumn());
104          }
105       }
106       throw new DException("DSE3515", new Object  [] {columnName});
107    }
108 }
109
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