1 ///////////////////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
3 // Copyright (C) 2001-2026 the original author or authors.
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ///////////////////////////////////////////////////////////////////////////////////////////////
19
20 package com.puppycrawl.tools.checkstyle.filters;
21
22 import com.puppycrawl.tools.checkstyle.AbstractAutomaticBean;
23 import com.puppycrawl.tools.checkstyle.api.AuditEvent;
24 import com.puppycrawl.tools.checkstyle.api.Filter;
25 import com.puppycrawl.tools.checkstyle.api.SeverityLevel;
26
27 /**
28 * <div>
29 * Accept violation to be present in audit report according to the
30 * <a href="https://checkstyle.org/config.html#Severity">severity level</a>.
31 * </div>
32 *
33 * <p>
34 * Notes:
35 * SeverityMatchFilter can suppress Checks that have Treewalker or Checker as parent module.
36 * </p>
37 *
38 * <p>
39 * In Checkstyle, when a filter accepts a violation
40 * (i.e. {@code accept()} returns {@code true}), the violation is kept in the
41 * final report; to make a violation disappear from the report, the filter must
42 * reject it by returning {@code false}. For {@code SeverityMatchFilter}, set
43 * {@code severity} to the level you want to control and {@code acceptOnMatch}
44 * to {@code true} to keep matching violations in the final report, or to
45 * {@code false} to remove them from it.
46 * </p>
47 *
48 * @since 3.2
49 */
50 public class SeverityMatchFilter
51 extends AbstractAutomaticBean
52 implements Filter {
53
54 /** Specify the severity level of this filter. */
55 private SeverityLevel severity = SeverityLevel.ERROR;
56
57 /**
58 * Control whether the filter accepts an audit event if and only if there
59 * is a match between the event's severity level and property severity.
60 * If acceptOnMatch is {@code false}, then the filter accepts an audit event
61 * if and only if there is not a match between the event's severity level
62 * and property severity.
63 */
64 private boolean acceptOnMatch = true;
65
66 /**
67 * Creates a new {@code SeverityMatchFilter} instance.
68 */
69 public SeverityMatchFilter() {
70 // no code by default
71 }
72
73 /**
74 * Setter to specify the severity level of this filter.
75 *
76 * @param severity The new severity level
77 * @see SeverityLevel
78 * @since 3.2
79 */
80 public final void setSeverity(SeverityLevel severity) {
81 this.severity = severity;
82 }
83
84 /**
85 * Setter to control whether the filter accepts an audit event if and only if there
86 * is a match between the event's severity level and property severity.
87 * If acceptOnMatch is {@code false}, then the filter accepts an audit event
88 * if and only if there is not a match between the event's severity level and property severity.
89 *
90 * @param acceptOnMatch if true, accept on matches; if
91 * false, reject on matches.
92 * @since 3.2
93 */
94 public final void setAcceptOnMatch(boolean acceptOnMatch) {
95 this.acceptOnMatch = acceptOnMatch;
96 }
97
98 @Override
99 protected void finishLocalSetup() {
100 // No code by default
101 }
102
103 @Override
104 public boolean accept(AuditEvent event) {
105 final boolean severityMatches = severity == event.getSeverityLevel();
106 return acceptOnMatch == severityMatches;
107 }
108
109 }