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Java > Open Source Codes > org > objectstyle > cayenne > dba > postgres > PostgresQualifierTranslator


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
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7  * of the software. All rights reserved.
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56 package org.objectstyle.cayenne.dba.postgres;
57
58 import org.objectstyle.cayenne.access.trans.QueryAssembler;
59 import org.objectstyle.cayenne.access.trans.TrimmingQualifierTranslator;
60 import org.objectstyle.cayenne.exp.Expression;
61
62 /**
63  * Uses Postgres extensions to optimize various translations.
64  *
65  * @author Andrei Adamchik
66  * @since 1.1
67  */
68 public class PostgresQualifierTranslator extends TrimmingQualifierTranslator {
69
70     public PostgresQualifierTranslator(QueryAssembler queryAssembler) {
71         super(queryAssembler, "RTRIM");
72     }
73
74     public void startNode(Expression node, Expression parentNode) {
75
76         if (node.getOperandCount() == 2) {
77             // binary nodes are the only ones that currently require this
78 detectObjectMatch(node);
79
80             if (parenthesisNeeded(node, parentNode)) {
81                 qualBuf.append('(');
82             }
83
84             // super implementation has special handling
85 // of LIKE_IGNORE_CASE and NOT_LIKE_IGNORE_CASE
86 // Postgres uses ILIKE
87 // ...
88 }
89         else {
90             super.startNode(node, parentNode);
91         }
92     }
93
94     public void endNode(Expression node, Expression parentNode) {
95         if (node.getOperandCount() == 2) {
96             // check if we need to use objectMatchTranslator to finish building the expression
97 if (matchingObject) {
98                 appendObjectMatch();
99             }
100
101             if (parenthesisNeeded(node, parentNode))
102                 qualBuf.append(')');
103
104             // super implementation has special handling
105 // of LIKE_IGNORE_CASE and NOT_LIKE_IGNORE_CASE
106 // Postgres uses ILIKE
107 // ...
108 }
109         else {
110             super.endNode(node, parentNode);
111         }
112     }
113
114     public void finishedChild(Expression node, int childIndex, boolean hasMoreChildren) {
115         if (!hasMoreChildren) {
116             return;
117         }
118
119         // use ILIKE
120
121         switch (node.getType()) {
122
123             case Expression.LIKE_IGNORE_CASE :
124                 finishedChildNodeAppendExpression(node, " ILIKE ");
125                 break;
126             case Expression.NOT_LIKE_IGNORE_CASE :
127                 finishedChildNodeAppendExpression(node, " NOT ILIKE ");
128                 break;
129             default :
130                 super.finishedChild(node, childIndex, hasMoreChildren);
131         }
132     }
133
134     private void finishedChildNodeAppendExpression(Expression node, String JavaDoc operation) {
135         StringBuffer JavaDoc buf = (matchingObject) ? new StringBuffer JavaDoc() : qualBuf;
136         buf.append(operation);
137         if (matchingObject) {
138             objectMatchTranslator.setOperation(buf.toString());
139             objectMatchTranslator.setExpression(node);
140         }
141     }
142 }
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