1 /*
2 Copyright (c) 2018 James Ahlborn
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
17 package com.healthmarketscience.jackcess.expr;
18
19 /**
20 * A FunctionLookup provides a source for {@link Function} instances used
21 * during expression evaluation.
22 *
23 * @author James Ahlborn
24 */
25 public interface FunctionLookup
26 {
27 /**
28 * @return the function for the given function name, or {@code null} if none
29 * exists. Note that Access function names are treated in a case
30 * insensitive manner.
31 */
32 public Function getFunction(String name);
33 }