1 /**
2 * Copyright 2005-2013 The Kuali Foundation
3 *
4 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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.kuali.rice.krms.framework.engine;
17
18 import org.kuali.rice.krms.api.engine.ExecutionEnvironment;
19
20 /**
21 * A {@link AgendaTreeEntry} which executes its ifTrue {@link AgendaTree} if the given {@link Rule} result is true or
22 * its ifFalse {@link AgendaTree} if the result is false.
23 *
24 * @author Kuali Rice Team (rice.collab@kuali.org)
25 */
26 public final class BasicAgendaTreeEntry implements AgendaTreeEntry {
27
28 private final Rule rule;
29 private final AgendaTree ifTrue;
30 private final AgendaTree ifFalse;
31
32 /**
33 * Create a BasicAgendaTreeEntry with the given {@link Rule}.
34 * @param rule {@link Rule} to create the BasicAgendaTreeEntry with.
35 * @throws IllegalArgumentException if the rule is null.
36 */
37 public BasicAgendaTreeEntry(Rule rule) {
38 this(rule, null, null);
39 }
40
41 /**
42 * Create a BasicAgendaTreeEntry with the given {@link Rule} and ifTrue, ifFalse {@link AgendaTree}s.
43 * @param rule {@link Rule} to create the BasicAgendaTreeEntry with.
44 * @param ifTrue executed if the given rule's result is true.
45 * @param ifTrue executed if the given rule's result is false.
46 * @throws IllegalArgumentException if the rule is null.
47 */
48 public BasicAgendaTreeEntry(Rule rule, AgendaTree ifTrue, AgendaTree ifFalse) {
49 if (rule == null) {
50 throw new IllegalArgumentException("rule was null");
51 }
52 this.rule = rule;
53 this.ifTrue = ifTrue;
54 this.ifFalse = ifFalse;
55 }
56
57 @Override
58 public void execute(ExecutionEnvironment environment) {
59 boolean result = rule.evaluate(environment);
60 if (result && ifTrue != null) {
61 ifTrue.execute(environment);
62 }
63 if (!result && ifFalse != null) {
64 ifFalse.execute(environment);
65 }
66 }
67
68 }