Source Code Cross Referenced for EmptyDateFormatter.java in  » Swing-Library » jgoodies-validation » com » jgoodies » validation » formatter » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » jgoodies validation » com.jgoodies.validation.formatter 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         *  o Redistributions of source code must retain the above copyright notice,
008:         *    this list of conditions and the following disclaimer.
009:         *
010:         *  o Redistributions in binary form must reproduce the above copyright notice,
011:         *    this list of conditions and the following disclaimer in the documentation
012:         *    and/or other materials provided with the distribution.
013:         *
014:         *  o Neither the name of JGoodies Karsten Lentzsch nor the names of
015:         *    its contributors may be used to endorse or promote products derived
016:         *    from this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
020:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
021:         * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
022:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
025:         * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
026:         * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
027:         * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
028:         * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package com.jgoodies.validation.formatter;
032:
033:        import java.text.DateFormat;
034:        import java.text.ParseException;
035:        import java.util.Date;
036:
037:        import javax.swing.text.DateFormatter;
038:
039:        import com.jgoodies.validation.util.ValidationUtils;
040:
041:        /**
042:         * In addition to its superclass DateFormatter, this class converts
043:         * to/from the empty string. Therefore it holds an <em>empty value</em>
044:         * that is the counterpart of the empty string.
045:         * The Method <code>#valueToString</code> converts the empty value to the
046:         * empty string. And <code>#stringToValue</code> converts blank strings
047:         * to the empty value. In all other cases the conversion is delegated
048:         * to its superclass.<p>
049:         *
050:         * Often the empty value is <code>null</code>. As an alternative you can map
051:         * the empty string to a given date, for example epoch (January 1, 1970).
052:         *
053:         * <strong>Examples:</strong><pre>
054:         * new EmptyDateFormatter();
055:         * new EmptyDateFormatter(new Date(0));
056:         * </pre>
057:         *
058:         * @author Karsten Lentzsch
059:         * @version $Revision: 1.5 $
060:         *
061:         * @see java.text.Format
062:         */
063:        public class EmptyDateFormatter extends DateFormatter {
064:
065:            /**
066:             * Holds the date that is converted to an empty string and
067:             * that is the result of converting blank strings to a value.
068:             *
069:             * @see #stringToValue(String)
070:             * @see #valueToString(Object)
071:             */
072:            private final Date emptyValue;
073:
074:            // Instance Creation ****************************************************
075:
076:            /**
077:             * Constructs an EmptyDateFormatter that converts <code>null</code>
078:             * to the empty string and vice versa.
079:             */
080:            public EmptyDateFormatter() {
081:                this ((Date) null);
082:            }
083:
084:            /**
085:             * Constructs an EmptyDateFormatter configured with the specified
086:             * Format; maps <code>null</code> to the empty string and vice versa.
087:             *
088:             * @param format Format used to dictate legal values
089:             */
090:            public EmptyDateFormatter(DateFormat format) {
091:                this (format, null);
092:            }
093:
094:            /**
095:             * Constructs an EmptyDateFormatter that converts the given
096:             * <code>emptyValue</code> to the empty string and vice versa.
097:             *
098:             * @param emptyValue   the representation of the empty string
099:             */
100:            public EmptyDateFormatter(Date emptyValue) {
101:                this .emptyValue = emptyValue == null ? null : new Date(
102:                        emptyValue.getTime());
103:            }
104:
105:            /**
106:             * Constructs an EmptyDateFormatter configured with the specified
107:             * Format; maps <code>null</code> to the given <code>emptyValue</code>
108:             * and vice versa.
109:             *
110:             * @param format Format used to dictate legal values
111:             * @param emptyValue   the representation of the empty string
112:             */
113:            public EmptyDateFormatter(DateFormat format, Date emptyValue) {
114:                super (format);
115:                this .emptyValue = emptyValue == null ? null : new Date(
116:                        emptyValue.getTime());
117:            }
118:
119:            // Overriding Superclass Behavior *****************************************
120:
121:            /**
122:             * Returns the <code>Object</code> representation of the
123:             * <code>String</code> <code>text</code>.<p>
124:             *
125:             * Unlike its superclass, this class converts blank strings
126:             * to the empty value.
127:             *
128:             * @param text <code>String</code> to convert
129:             * @return <code>Object</code> representation of text
130:             * @throws ParseException if there is an error in the conversion
131:             */
132:            @Override
133:            public Object stringToValue(String text) throws ParseException {
134:                return ValidationUtils.isBlank(text) ? emptyValue : super 
135:                        .stringToValue(text);
136:            }
137:
138:            /**
139:             * Returns a String representation of the Object <code>value</code>.
140:             * This invokes <code>format</code> on the current <code>Format</code>.<p>
141:             *
142:             * Unlike its superclass, this class converts the empty value
143:             * to the empty string.
144:             *
145:             * @param value   the value to convert
146:             * @return a String representation of value
147:             * @throws ParseException if there is an error in the conversion
148:             */
149:            @Override
150:            public String valueToString(Object value) throws ParseException {
151:                return ValidationUtils.equals(value, emptyValue) ? "" : super
152:                        .valueToString(value);
153:            }
154:
155:        }
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