1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.log4j.chainsaw;
19
20 import org.apache.log4j.rule.AbstractRule;
21 import org.apache.log4j.rule.Rule;
22 import org.apache.log4j.spi.LoggingEvent;
23
24 import java.beans.PropertyChangeEvent;
25 import java.beans.PropertyChangeListener;
26 import java.util.Map;
27
28
29 /**
30 * A mediator class that implements the Rule interface, by combining several
31 * optional rules used by Chainsaw's filtering GUI's into a single Rule.
32 * <p>
33 * <p>Setting the individual sub-rules propagates a PropertyChangeEvent as per
34 * standard Java beans principles.
35 *
36 * @author Paul Smith <psmith@apache.org>
37 * @author Scott Deboy <sdeboy@apache.org>
38 */
39 public class RuleMediator extends AbstractRule {
40 private Rule loggerRule;
41 private Rule filterRule;
42 private Rule findRule;
43 private final PropertyChangeListener ruleChangerNotifier = new RuleChangerNotifier();
44 private boolean findRuleRequired;
45
46 public RuleMediator(boolean findRuleRequired) {
47 this.findRuleRequired = findRuleRequired;
48 }
49
50 /* (non-Javadoc)
51 * @see org.apache.log4j.chainsaw.rule.Rule#evaluate(org.apache.log4j.spi.LoggingEvent)
52 */
53 public boolean evaluate(LoggingEvent e, Map matches) {
54 if (findRuleRequired) {
55 if (findRule == null) {
56 return false;
57 }
58 if (!findRule.evaluate(e, null)) {
59 return false;
60 }
61 }
62
63 return (loggerRule == null || loggerRule.evaluate(e, null)) && (filterRule == null || filterRule.evaluate(e, null));
64
65 }
66
67 public boolean isFindRuleRequired() {
68 return findRuleRequired;
69 }
70
71 public void setFilterRule(Rule r) {
72 Rule oldFilterRule = this.filterRule;
73 this.filterRule = r;
74 firePropertyChange("filterRule", oldFilterRule, this.filterRule);
75 }
76
77 public void setFindRule(Rule r) {
78 Rule oldFindRule = this.findRule;
79 this.findRule = r;
80 firePropertyChange("findRule", oldFindRule, this.findRule);
81 }
82
83 public void setLoggerRule(Rule r) {
84 Rule oldLoggerRule = this.loggerRule;
85 this.loggerRule = r;
86 if (oldLoggerRule != null) {
87 oldLoggerRule.removePropertyChangeListener(ruleChangerNotifier);
88 }
89 this.loggerRule.addPropertyChangeListener(ruleChangerNotifier);
90 firePropertyChange("loggerRule", oldLoggerRule, this.loggerRule);
91 }
92
93 /**
94 * Helper class that propagates internal Rules propertyChange events
95 * to external parties, since an internal rule changing really means
96 * this outter rule is going to change too.
97 */
98 private class RuleChangerNotifier implements PropertyChangeListener {
99 /* (non-Javadoc)
100 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
101 */
102 public void propertyChange(PropertyChangeEvent evt) {
103 RuleMediator.this.firePropertyChange(evt);
104 }
105 }
106 }