com.googlecode.paradox.data.field.DateField Maven / Gradle / Ivy

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/*
 * Copyright (c) 2009 Leonardo Alves da Costa
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details. You should have received a copy of the GNU General Public License along with this
 * program. If not, see .
 */
package com.googlecode.paradox.data.field;

import com.googlecode.paradox.data.FieldParser;
import com.googlecode.paradox.metadata.Field;
import com.googlecode.paradox.metadata.paradox.ParadoxTable;
import com.googlecode.paradox.results.ParadoxType;
import com.googlecode.paradox.utils.DateUtils;

import java.nio.ByteBuffer;
import java.sql.Date;

/**
 * Parses date fields.
 *
 * @since 1.3
 */
public final class DateField implements FieldParser {

    /**
     * Creates a new instance.
     */
    public DateField() {
        super();
    }

    @Override
    public boolean match(final ParadoxType type) {
        return type == ParadoxType.DATE;
    }

    @Override
    public Date parse(final ParadoxTable table, final ByteBuffer buffer, final Field field) {
        final long days = buffer.getInt() & 0x0FFF_FFFFL;

        Date date = null;
        if (days != 0) {
            date = DateUtils.sdnToGregorian(days + 1_721_425);
        }

        return date;
    }
}