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Java > Open Source Codes > org > outerj > daisy > query > model > functions > RightFunction


1 /*
2  * Copyright 2004 Outerthought bvba and Schaubroeck nv
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.outerj.daisy.query.model.functions;
17
18 import org.outerj.daisy.query.model.SqlGenerationContext;
19 import org.outerj.daisy.repository.query.QueryException;
20
21 public class RightFunction extends LeftFunction {
22     public static final String JavaDoc NAME = "Right";
23
24     public String JavaDoc getFunctionName() {
25         return NAME;
26     }
27
28     protected String JavaDoc getFunctionName(SqlGenerationContext context) {
29         return context.getJdbcHelper().getStringRightFunction();
30     }
31
32     protected Object JavaDoc evaluate(String JavaDoc value, int length) throws QueryException {
33         if (value == null)
34             return null;
35         else if (length < 0)
36             throw new QueryException("Length parameter of " + NAME + " function cannot be negative.");
37         else if (length > value.length())
38             return value;
39         else
40             return value.substring(value.length() - length, value.length());
41     }
42 }
43
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