dom/src/main/java/org/apache/james/mime4j/field/DateTimeFieldImpl.java

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package org.apache.james.mime4j.field;

import java.io.StringReader;
import java.util.Date;

import org.apache.james.mime4j.codec.DecodeMonitor;
import org.apache.james.mime4j.dom.FieldParser;
import org.apache.james.mime4j.dom.field.DateTimeField;
import org.apache.james.mime4j.field.datetime.parser.DateTimeParser;
import org.apache.james.mime4j.field.datetime.parser.ParseException;
import org.apache.james.mime4j.field.datetime.parser.TokenMgrError;
import org.apache.james.mime4j.stream.Field;

/**
 * Date-time field such as <code>Date</code> or <code>Resent-Date</code>.
 */
public class DateTimeFieldImpl extends AbstractField implements DateTimeField {
    private boolean parsed = false;

    private Date date;
    private ParseException parseException;

    DateTimeFieldImpl(Field rawField, DecodeMonitor monitor) {
        super(rawField, monitor);
    }

    /**
     * @see org.apache.james.mime4j.dom.field.DateTimeField#getDate()
     */
    public Date getDate() {
        if (!parsed)
            parse();

        return date;
    }

    /**
     * @see org.apache.james.mime4j.dom.field.DateTimeField#getParseException()
     */
    @Override
    public ParseException getParseException() {
        if (!parsed)
            parse();

        return parseException;
    }

    private void parse() {
        String body = getBody();

        try {
            date = new DateTimeParser(new StringReader(body)).parseAll()
                    .getDate();
        } catch (ParseException e) {
            parseException = e;
        } catch (TokenMgrError e) {
            parseException = new ParseException(e);
        }

        parsed = true;
    }

    public static final FieldParser<DateTimeField> PARSER = new FieldParser<DateTimeField>() {

        public DateTimeField parse(final Field rawField, final DecodeMonitor monitor) {
            return new DateTimeFieldImpl(rawField, monitor);
        }

    };
}