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Java > Open Source Codes > org > apache > lenya > workflow > impl > ConditionFactory


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
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
18 /* $Id: ConditionFactory.java 42598 2004-03-01 16:18:28Z gregor $ */
19
20 package org.apache.lenya.workflow.impl;
21
22 import org.apache.lenya.workflow.Condition;
23 import org.apache.lenya.workflow.WorkflowException;
24
25
26 /**
27  * Factory to build conditions.
28  */
29 public final class ConditionFactory {
30     
31     /**
32      * Ctor.
33      */
34     private ConditionFactory() {
35     }
36
37     /**
38      * Creates a condition.
39      * @param className The condition class name.
40      * @param expression The condition expression.
41      * @return A condition.
42      * @throws WorkflowException when creating the condition failed.
43      */
44     protected static Condition createCondition(String JavaDoc className, String JavaDoc expression)
45         throws WorkflowException {
46
47         Condition condition;
48
49         try {
50             Class JavaDoc clazz = Class.forName(className);
51             condition = (Condition) clazz.newInstance();
52             condition.setExpression(expression);
53         } catch (ClassNotFoundException JavaDoc e) {
54             throw new WorkflowException(e);
55         } catch (InstantiationException JavaDoc e) {
56             throw new WorkflowException(e);
57         } catch (IllegalAccessException JavaDoc e) {
58             throw new WorkflowException(e);
59         }
60
61         return condition;
62     }
63 }
64
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