package prefuse.data.parser;
import java.sql.Time;
import java.text.DateFormat;
/**
* DataParser instance that parses Date values as java.util.Time instances,
* representing a particular time (but no specific date).
* This class uses a backing {@link java.text.DateFormat} instance to
* perform parsing. The DateFormat instance to use can be passed in to the
* constructor, or by default the DateFormat returned by
* {@link java.text.DateFormat#getTimeInstance(int)} with an
* argument of {@link java.text.DateFormat#SHORT} is used.
*
* @author <a href="http://jheer.org">jeffrey heer</a>
*/
public class TimeParser extends DateParser {
/**
* Create a new TimeParser.
*/
public TimeParser() {
this(DateFormat.getTimeInstance(DateFormat.SHORT));
}
/**
* Create a new TimeParser.
* @param dateFormat the DateFormat instance to use for parsing
*/
public TimeParser(DateFormat dateFormat) {
super(dateFormat);
}
/**
* Returns java.sql.Time.class.
* @see prefuse.data.parser.DataParser#getType()
*/
public Class getType() {
return Time.class;
}
/**
* @see prefuse.data.parser.DataParser#canParse(java.lang.String)
*/
public boolean canParse(String val) {
try {
parseTime(val);
return true;
} catch ( DataParseException e ) {
return false;
}
}
/**
* @see prefuse.data.parser.DataParser#parse(java.lang.String)
*/
public Object parse(String val) throws DataParseException {
return parseTime(val);
}
/**
* Parse a Time value from a text string.
* @param text the text string to parse
* @return the parsed Time value
* @throws DataParseException if an error occurs during parsing
*/
public Time parseTime(String text) throws DataParseException {
m_pos.setErrorIndex(0);
m_pos.setIndex(0);
// parse the data value, convert to the wrapper type
Time t = null;
try {
t = Time.valueOf(text);
m_pos.setIndex(text.length());
} catch ( IllegalArgumentException e ) {
t = null;
}
if ( t == null ) {
java.util.Date d1 = m_dfmt.parse(text, m_pos);
if ( d1 != null ) {
t = new Time(d1.getTime());
}
}
// date format will parse substrings successfully, so we need
// to check the position to make sure the whole value was used
if ( t == null || m_pos.getIndex() < text.length() ) {
throw new DataParseException("Could not parse Date: "+text);
} else {
return t;
}
}
} // end of class TimeParser