package org.appfuse.util;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.lang.StringUtils;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* This class converts a java.util.Date to a String and a String to a java.util.Date.
*
* @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a>
* @author <a href="mailto:tstrausz@tryllian.nl">Tibor Strausz</a>
*/
public class DateConverter implements Converter {
/**
* Convert a date to a String and a String to a Date
* @param type String, Date or Timestamp
* @param value value to convert
* @return Converted value for property population
*/
@SuppressWarnings("unchecked")
public Object convert(final Class type, final Object value) {
if (value == null) {
return null;
} else if (type == Timestamp.class) {
return convertToDate(type, value, DateUtil.getDateTimePattern());
} else if (type == Date.class) {
return convertToDate(type, value, DateUtil.getDatePattern());
} else if (type == String.class) {
return convertToString(value);
}
throw new ConversionException("Could not convert " + value.getClass().getName() + " to " + type.getName());
}
/**
* Convert a String to a Date with the specified pattern.
* @param type String
* @param value value of String
* @param pattern date pattern to parse with
* @return Converted value for property population
*/
protected Object convertToDate(final Class<?> type, final Object value, final String pattern) {
final DateFormat df = new SimpleDateFormat(pattern);
if (value instanceof String) {
try {
if (StringUtils.isEmpty(value.toString())) {
return null;
}
final Date date = df.parse((String) value);
if (type.equals(Timestamp.class)) {
return new Timestamp(date.getTime());
}
return date;
} catch (final Exception e) {
throw new ConversionException("Error converting String to Date", e);
}
}
throw new ConversionException("Could not convert " + value.getClass().getName() + " to " + type.getName());
}
/**
* Convert a java.util.Date or a java.sql.Timestamp to a String. Or does a toString
* @param value value to convert
* @return Converted value for property population
*/
protected Object convertToString(final Object value) {
if (value instanceof Date) {
DateFormat df = new SimpleDateFormat(DateUtil.getDatePattern());
if (value instanceof Timestamp) {
df = new SimpleDateFormat(DateUtil.getDateTimePattern());
}
try {
return df.format(value);
} catch (final Exception e) {
throw new ConversionException("Error converting Date to String", e);
}
} else {
return value.toString();
}
}
}