/*
* Copyright 2005-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.strecks.converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.strecks.exceptions.ConversionException;
/**
* Provides logic for converting to and from dates using the SimpleDateFormat class. The subclasses of this abstract
* class must provide the pattern to be used
*
* @author Phil Zoio
*/
public abstract class SimpleDateFormatConverter implements Converter<String, Date>
{
public SimpleDateFormatConverter()
{
super();
}
public void setTargetClass(Class clazz)
{
if (!clazz.equals(Date.class))
{
throw new IllegalArgumentException("Converter will only convert to and from java.util.Date instances");
}
}
public Date toTargetType(String toConvert) throws ConversionException
{
SimpleDateFormat formatter = getDateFormat();
if (toConvert == null || toConvert.length() == 0)
return null;
try
{
return formatter.parse(toConvert);
}
catch (ParseException e)
{
// should have already been validated so this is not recoverable
throw new ConversionException("Unable to convert value " + toConvert + " to Date using pattern "
+ getDatePattern());
}
}
public String toSourceType(Date toConvert)
{
if (toConvert == null)
return null;
return getDateFormat().format(toConvert);
}
private SimpleDateFormat getDateFormat()
{
SimpleDateFormat formatter = new SimpleDateFormat(getDatePattern());
formatter.setLenient(false);
return formatter;
}
protected abstract String getDatePattern();
}