FunctionFactory


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;
17  
18  // Note: the ParseException class is generated by JavaCC
19  import org.outerj.daisy.query.ParseException;
20  import org.outerj.daisy.query.model.functions.*;
21  
22  import java.util.HashMap  ;
23  
24  public class FunctionFactory {
25      private static final HashMap   FUNCTIONS;
26      static {
27          FUNCTIONS = new HashMap  ();
28          // string functions
29          FUNCTIONS.put(LengthFunction.NAME, LengthFunction.class);
30          FUNCTIONS.put(ConcatFunction.NAME, ConcatFunction.class);
31          FUNCTIONS.put(LeftFunction.NAME, LeftFunction.class);
32          FUNCTIONS.put(RightFunction.NAME, RightFunction.class);
33          FUNCTIONS.put(SubstringFunction.NAME, SubstringFunction.class);
34          FUNCTIONS.put(UpperCaseFunction.NAME, UpperCaseFunction.class);
35          FUNCTIONS.put(LowerCaseFunction.NAME, LowerCaseFunction.class);
36  
37          // date functions
38          FUNCTIONS.put(CurrentDateFunction.NAME, CurrentDateFunction.class);
39          FUNCTIONS.put(YearFunction.NAME, YearFunction.class);
40          FUNCTIONS.put(MonthFunction.NAME, MonthFunction.class);
41          FUNCTIONS.put(DayOfWeekFunction.NAME, DayOfWeekFunction.class);
42          FUNCTIONS.put(DayOfMonthFunction.NAME, DayOfMonthFunction.class);
43          FUNCTIONS.put(DayOfYearFunction.NAME, DayOfYearFunction.class);
44          FUNCTIONS.put(WeekFunction.NAME, WeekFunction.class);
45          FUNCTIONS.put(RelativeDateFunction.NAME, RelativeDateFunction.class);
46  
47          // datetime functions
48          FUNCTIONS.put(CurrentDateTimeFunction.NAME, CurrentDateTimeFunction.class);
49          FUNCTIONS.put(RelativeDateTimeFunction.NAME, RelativeDateTimeFunction.class);
50  
51          // numeric functions
52          FUNCTIONS.put(RandomFunction.NAME, RandomFunction.class);
53          FUNCTIONS.put(ModFunction.NAME, ModFunction.class);
54          FUNCTIONS.put(AbsFunction.NAME, AbsFunction.class);
55          FUNCTIONS.put(FloorFunction.NAME, FloorFunction.class);
56          FUNCTIONS.put(CeilingFunction.NAME, CeilingFunction.class);
57          FUNCTIONS.put(RoundFunction.NAME, RoundFunction.class);
58  
59          // other
60          FUNCTIONS.put(ContextDocFunction.NAME, ContextDocFunction.class);
61          FUNCTIONS.put(UserIdFunction.NAME, UserIdFunction.class);
62      }
63  
64      public static Function createFunction(String   name) throws ParseException {
65          Class   functionClass = (Class  )FUNCTIONS.get(name);
66          if (functionClass == null)
67              throw new ParseException("No such function: " + name);
68          try {
69              return (Function)functionClass.newInstance();
70          } catch (Exception   e) {
71              throw new ParseException("Error creating function " + name + ": " + e.toString());
72          }
73      }
74  }
75
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