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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of paradoxdriver Show documentation

A Paradox Java Driver (using JDBC 4)

There is a newer version: 1.6.3

/*
 * LongField.java 07/06/2016 Copyright (C) 2016 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.data.table.value.FieldValue;
import com.googlecode.paradox.metadata.ParadoxField;
import com.googlecode.paradox.metadata.ParadoxTable;

import java.nio.ByteBuffer;
import java.sql.Types;

/**
 * Parses long fields.
 *
 * @author Leonardo Alves da Costa
 * @version 1.0
 * @since 1.3
 */
public final class LongField implements FieldParser {

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean match(final int type) {
        return type == 4;
    }

    /**
     * Longs (4 bytes) fields are stored as two's complement with the high bit inverted.
     */
    @Override
    public FieldValue parse(final ParadoxTable table, final ByteBuffer buffer, final ParadoxField field) {
        final long l = buffer.getInt() ^ 0x8000_0000;
        return new FieldValue(l, Types.BIGINT);
    }
}