Source Code Cross Referenced for SynchronizedDateFormat.java in  » Net » james-2.3.1 » org » apache » mailet » dates » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » james 2.3.1 » org.apache.mailet.dates 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /****************************************************************
002:         * Licensed to the Apache Software Foundation (ASF) under one   *
003:         * or more contributor license agreements.  See the NOTICE file *
004:         * distributed with this work for additional information        *
005:         * regarding copyright ownership.  The ASF licenses this file   *
006:         * to you under the Apache License, Version 2.0 (the            *
007:         * "License"); you may not use this file except in compliance   *
008:         * with the License.  You may obtain a copy of the License at   *
009:         *                                                              *
010:         *   http://www.apache.org/licenses/LICENSE-2.0                 *
011:         *                                                              *
012:         * Unless required by applicable law or agreed to in writing,   *
013:         * software distributed under the License is distributed on an  *
014:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015:         * KIND, either express or implied.  See the License for the    *
016:         * specific language governing permissions and limitations      *
017:         * under the License.                                           *
018:         ****************************************************************/package org.apache.mailet.dates;
019:
020:        import java.text.DateFormat;
021:        import java.text.ParseException;
022:        import java.text.SimpleDateFormat;
023:        import java.util.Date;
024:        import java.util.Locale;
025:        import java.util.TimeZone;
026:
027:        /**
028:         * This class is designed to be a synchronized wrapper for a
029:         * <code>java.text.DateFormat</code> subclass.  In general,
030:         * these subclasses (most notably the <code>java.text.SimpleDateFormat</code>
031:         * classes are not thread safe, so we need to synchronize on the
032:         * internal DateFormat for all delegated calls.
033:         *
034:         */
035:        public class SynchronizedDateFormat implements  SimplifiedDateFormat {
036:            private final DateFormat internalDateFormat;
037:
038:            /**
039:             * Public constructor that mimics that of SimpleDateFormat.  See
040:             * java.text.SimpleDateFormat for more details.
041:             *
042:             * @param pattern the pattern that defines this DateFormat
043:             * @param locale the locale
044:             */
045:            public SynchronizedDateFormat(String pattern, Locale locale) {
046:                internalDateFormat = new SimpleDateFormat(pattern, locale);
047:            }
048:
049:            /**
050:             * <p>Wrapper method to allow child classes to synchronize a preexisting
051:             * DateFormat.</p>
052:             *
053:             * <p>TODO: Investigate replacing this with a factory method.</p>
054:             *
055:             * @param the DateFormat to synchronize
056:             */
057:            protected SynchronizedDateFormat(DateFormat theDateFormat) {
058:                internalDateFormat = theDateFormat;
059:            }
060:
061:            /**
062:             * SimpleDateFormat will handle most of this for us, but we
063:             * want to ensure thread safety, so we wrap the call in a
064:             * synchronized block.
065:             *
066:             * @return java.lang.String
067:             * @param d Date
068:             */
069:            public String format(Date d) {
070:                synchronized (internalDateFormat) {
071:                    return internalDateFormat.format(d);
072:                }
073:            }
074:
075:            /**
076:             * Parses text from the beginning of the given string to produce a date.
077:             * The method may not use the entire text of the given string.
078:             * <p>
079:             * This method is designed to be thread safe, so we wrap our delegated
080:             * parse method in an appropriate synchronized block.
081:             *
082:             * @param source A <code>String</code> whose beginning should be parsed.
083:             * @return A <code>Date</code> parsed from the string.
084:             * @throws ParseException if the beginning of the specified string
085:             *         cannot be parsed.
086:             */
087:            public Date parse(String source) throws ParseException {
088:                synchronized (internalDateFormat) {
089:                    return internalDateFormat.parse(source);
090:                }
091:            }
092:
093:            /**
094:             * Sets the time zone of this SynchronizedDateFormat object.
095:             * @param zone the given new time zone.
096:             */
097:            public void setTimeZone(TimeZone zone) {
098:                synchronized (internalDateFormat) {
099:                    internalDateFormat.setTimeZone(zone);
100:                }
101:            }
102:
103:            /**
104:             * Gets the time zone.
105:             * @return the time zone associated with this SynchronizedDateFormat.
106:             */
107:            public TimeZone getTimeZone() {
108:                synchronized (internalDateFormat) {
109:                    return internalDateFormat.getTimeZone();
110:                }
111:            }
112:
113:            /**
114:             * Specify whether or not date/time parsing is to be lenient.  With
115:             * lenient parsing, the parser may use heuristics to interpret inputs that
116:             * do not precisely match this object's format.  With strict parsing,
117:             * inputs must match this object's format.
118:             * @param lenient when true, parsing is lenient
119:             * @see java.util.Calendar#setLenient
120:             */
121:            public void setLenient(boolean lenient) {
122:                synchronized (internalDateFormat) {
123:                    internalDateFormat.setLenient(lenient);
124:                }
125:            }
126:
127:            /**
128:             * Tell whether date/time parsing is to be lenient.
129:             * @return whether this SynchronizedDateFormat is lenient.
130:             */
131:            public boolean isLenient() {
132:                synchronized (internalDateFormat) {
133:                    return internalDateFormat.isLenient();
134:                }
135:            }
136:
137:            /**
138:             * Overrides hashCode
139:             */
140:            public int hashCode() {
141:                synchronized (internalDateFormat) {
142:                    return internalDateFormat.hashCode();
143:                }
144:            }
145:
146:            /**
147:             * Overrides equals
148:             */
149:            public boolean equals(Object obj) {
150:                if (this  == obj) {
151:                    return true;
152:                }
153:                if (obj == null || getClass() != obj.getClass()) {
154:                    return false;
155:                }
156:                synchronized (internalDateFormat) {
157:                    return internalDateFormat.equals(obj);
158:                }
159:            }
160:
161:        }
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