001 /*
002 * Copyright 2003-2004 The Apache Software Foundation
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.apache.commons.convert1.string;
017
018
019 import java.sql.Date;
020 import org.apache.commons.convert1.ConversionException;
021 import org.apache.commons.convert1.Converter;
022
023
024 /**
025 * <p>Standard {@link Converter} implementation that converts an incoming
026 * String into a <code>java.sql.Date</code> object, optionally using a
027 * default value or throwing a {@link ConversionException} if a conversion
028 * error occurs.</p>
029 *
030 * @author Craig R. McClanahan
031 * @version $Id: SqlDateConverter.java 155441 2005-02-26 13:19:22Z dirkv $
032 * @since 0.1
033 */
034
035 public final class SqlDateConverter implements Converter {
036
037
038 // ----------------------------------------------------------- Constructors
039
040
041 /**
042 * Create a {@link Converter} that will throw a {@link ConversionException}
043 * if a conversion error occurs.
044 */
045 public SqlDateConverter() {
046
047 this.defaultValue = null;
048 this.useDefault = false;
049
050 }
051
052
053 /**
054 * Create a {@link Converter} that will return the specified default value
055 * if a conversion error occurs.
056 *
057 * @param defaultValue The default value to be returned
058 */
059 public SqlDateConverter(Object defaultValue) {
060
061 this.defaultValue = defaultValue;
062 this.useDefault = true;
063
064 }
065
066
067 // ----------------------------------------------------- Instance Variables
068
069
070 /**
071 * The default value specified to our Constructor, if any.
072 */
073 private Object defaultValue = null;
074
075
076 /**
077 * Should we return the default value on conversion errors?
078 */
079 private boolean useDefault = true;
080
081
082 // --------------------------------------------------------- Public Methods
083
084
085 /**
086 * Convert the specified input object into an output object of the
087 * specified type.
088 *
089 * @param type Data type to which this value should be converted
090 * @param value The input value to be converted
091 *
092 * @exception ConversionException if conversion cannot be performed
093 * successfully
094 */
095 public Object convert(Class type, Object value) {
096
097 if (value == null) {
098 if (useDefault) {
099 return (defaultValue);
100 } else {
101 throw new ConversionException("No value specified");
102 }
103 }
104
105 if (value instanceof Date) {
106 return (value);
107 }
108
109 try {
110 return (Date.valueOf(value.toString()));
111 } catch (Exception e) {
112 if (useDefault) {
113 return (defaultValue);
114 } else {
115 throw new ConversionException(e);
116 }
117 }
118
119 }
120
121
122 }