Source Code Cross Referenced for ConfigParameter.java in  » Web-Mail » jwebmail-0.7 » net » wastl » webmail » config » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Mail » jwebmail 0.7 » net.wastl.webmail.config 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* $Id: ConfigParameter.java,v 1.1.1.1 2002/10/02 18:41:44 wastl Exp $ */
002:        package net.wastl.webmail.config;
003:
004:        import java.util.*;
005:
006:        /*
007:         * ConfigParameter.java
008:         *
009:         * Created: Sep 1999
010:         *
011:         * Copyright (C) 1999-2000 Sebastian Schaffert
012:         * 
013:         * This program is free software; you can redistribute it and/or
014:         * modify it under the terms of the GNU General Public License
015:         * as published by the Free Software Foundation; either version 2
016:         * of the License, or (at your option) any later version.
017:         * 
018:         * This program is distributed in the hope that it will be useful,
019:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
020:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
021:         * GNU General Public License for more details.
022:         * 
023:         * You should have received a copy of the GNU General Public License
024:         * along with this program; if not, write to the Free Software
025:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
026:         */
027:        /**
028:         * An abstraction for a configuration parameter.
029:         * Subclasses must implement a method that checks whether a specific value is correct for this 
030:         * parameter.
031:         *
032:         * ConfigParameters may have ConfigurationListeners that work much like the Listeners in the 
033:         * Java AWT. All listeners get informed if the value of the parameter has changed.
034:         *
035:         * Each ConfigParameter has a corresponding (unique) key, a default value (if not yet changed
036:         * by the user) and a short description for the administrator about what the parameter means.
037:         *
038:         * This is a scheme only, however, ConfigParameters just describe the behaviour of certain
039:         * keys in the WebMail configuration, they don't actually store the value itself.
040:         */
041:        public abstract class ConfigParameter {
042:            protected String key;
043:            protected Object def_value;
044:            protected String desc;
045:            protected Vector listeners;
046:
047:            protected String group;
048:
049:            /**
050:             * Create a new parameter.
051:             * @param name Unique key of this parameter
052:             * @param def Default value for this parameter
053:             * @param desc Description for this parameter
054:             */
055:            public ConfigParameter(String name, Object def, String desc) {
056:                key = name;
057:                this .def_value = def;
058:                this .desc = desc;
059:                group = "default";
060:                listeners = new Vector();
061:            }
062:
063:            public void setGroup(String g) {
064:                group = g;
065:            }
066:
067:            /**
068:             * Return the key of this parameter.
069:             */
070:            public String getKey() {
071:                return key;
072:            }
073:
074:            /**
075:             * Return the default value of this parameter.
076:             */
077:            public Object getDefault() {
078:                return def_value;
079:            }
080:
081:            public void setDefault(Object value) {
082:                def_value = value;
083:            }
084:
085:            /**
086:             * Return the description for this parameter.
087:             */
088:            public String getDescription() {
089:                return desc;
090:            }
091:
092:            /**
093:             * Add a ConfigurationListener for this object that will be informed if the parameter's
094:             * value changes.
095:             */
096:            public void addConfigurationListener(ConfigurationListener l) {
097:                listeners.addElement(l);
098:            }
099:
100:            /**
101:             * Get a list of all configuration listeners.
102:             */
103:            public Enumeration getConfigurationListeners() {
104:                return listeners.elements();
105:            }
106:
107:            /**
108:             * Put through some sort of filter.
109:             * This method is called when a String value for this parameter is set.
110:             * Subclasses should implement this, if they want to change the behaviour
111:             * @see CryptedStringConfigParameter
112:             */
113:            public String filter(String s) {
114:                return s;
115:            }
116:
117:            /**
118:             * Check whether the value that is passed as the parameter is a valid value for this
119:             * ConfigParameter
120:             * @see ChoiceConfigParameter
121:             */
122:            public abstract boolean isPossibleValue(Object value);
123:
124:            public String getType() {
125:                return "undefined";
126:            }
127:
128:            public String getGroup() {
129:                return group;
130:            }
131:        }
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