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Java > Open Source Codes > org > objectstyle > cayenne > access > jdbc > BindNotEqualDirective


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
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24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
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28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
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31  * "andrus at objectstyle dot org".
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52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.access.jdbc;
57
58 import java.io.IOException JavaDoc;
59 import java.io.Writer JavaDoc;
60
61 import org.apache.velocity.context.InternalContextAdapter;
62
63 /**
64  * A custom Velocity directive to create a PreparedStatement parameter text for "<>?".
65  * If null value is encountered, generated text will look like "IS NOT NULL". Usage in
66  * Velocity template is "WHERE SOME_COLUMN #bindNotEqual($xyz)".
67  *
68  * @since 1.1
69  * @author Andrei Adamchik
70  */
71 public class BindNotEqualDirective extends BindDirective {
72
73     public String JavaDoc getName() {
74         return "bindNotEqual";
75     }
76
77     protected void render(
78             InternalContextAdapter context,
79             Writer JavaDoc writer,
80             ParameterBinding binding) throws IOException JavaDoc {
81
82         if (binding.getValue() != null) {
83             bind(context, binding);
84             writer.write("<> ?");
85         }
86         else {
87             writer.write("IS NOT NULL");
88         }
89     }
90 }
91
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