Source Code Cross Referenced for BasicMarkerFactory.java in  » Development » SLF4J » org » slf4j » helpers » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » SLF4J » org.slf4j.helpers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* 
02:         * Copyright (c) 2004-2007 QOS.ch
03:         * All rights reserved.
04:         * 
05:         * Permission is hereby granted, free  of charge, to any person obtaining
06:         * a  copy  of this  software  and  associated  documentation files  (the
07:         * "Software"), to  deal in  the Software without  restriction, including
08:         * without limitation  the rights to  use, copy, modify,  merge, publish,
09:         * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10:         * permit persons to whom the Software  is furnished to do so, subject to
11:         * the following conditions:
12:         * 
13:         * The  above  copyright  notice  and  this permission  notice  shall  be
14:         * included in all copies or substantial portions of the Software.
15:         * 
16:         * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17:         * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18:         * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19:         * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20:         * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21:         * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22:         * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23:         */
24:
25:        package org.slf4j.helpers;
26:
27:        import java.util.HashMap;
28:        import java.util.Map;
29:
30:        import org.slf4j.IMarkerFactory;
31:        import org.slf4j.Marker;
32:
33:        /**
34:         * An almost trivial implementation of the {@link IMarkerFactory}
35:         * interface which creates {@link BasicMarker} instances.
36:         * 
37:         * <p>Simple logging systems can conform to the SLF4J API by binding
38:         * {@link org.slf4j.MarkerFactory} with an instance of this class.
39:         *
40:         * @author Ceki G&uuml;lc&uuml;
41:         */
42:        public class BasicMarkerFactory implements  IMarkerFactory {
43:
44:            Map markerMap = new HashMap();
45:
46:            /**
47:             * Regular users should <em>not</em> create
48:             * <code>BasicMarkerFactory</code> instances. <code>Marker</code>
49:             * instances can be obtained using the static {@link
50:             * org.slf4j.MarkerFactory#getMarker} method.
51:             */
52:            public BasicMarkerFactory() {
53:            }
54:
55:            /**
56:             * Manufacture a {@link BasicMarker} instance by name. If the instance has been 
57:             * created earlier, return the previously created instance. 
58:             * 
59:             * @param name the name of the marker to be created
60:             * @return a Marker instance
61:             */
62:            public synchronized Marker getMarker(String name) {
63:                if (name == null) {
64:                    throw new IllegalArgumentException(
65:                            "Marker name cannot be null");
66:                }
67:
68:                Marker marker = (Marker) markerMap.get(name);
69:                if (marker == null) {
70:                    marker = new BasicMarker(name);
71:                    markerMap.put(name, marker);
72:                }
73:                return marker;
74:            }
75:
76:            /**
77:             * Does the name marked already exist?
78:             */
79:            public synchronized boolean exists(String name) {
80:                if (name == null) {
81:                    return false;
82:                }
83:                return markerMap.containsKey(name);
84:            }
85:
86:            public boolean detachMarker(String name) {
87:                if (name == null) {
88:                    return false;
89:                }
90:                return (markerMap.remove(name) != null);
91:            }
92:
93:        }
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