/* * ValueGetter.java *  * PostGIS extension for PostgreSQL JDBC driver - Binary Parser *  * (C) 2005 Markus Schaber, markus.schaber@logix-tt.com *  * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation, either version 2.1 of the License. *  * This library 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 Lesser General Public License for more * details. *  * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA or visit the web at * http://www.gnu.org. *  * $Id: ValueGetter.java 1622 2005-04-15 14:04:34Z mschaber $ */package org.postgis.binary;public abstract class ValueGetter {    ByteGetter data;    int position;    public final byte endian;    public ValueGetter(ByteGetter data, byte endian) {        this.data = data;        this.endian = endian;    }    /**     * Get a byte, should be equal for all endians     */    public byte getByte() {        return (byte) data.get(position++);    }    public int getInt() {        int res = getInt(position);        position += 4;        return res;    }    public long getLong() {        long res = getLong(position);        position += 8;        return res;    }    /** Get a 32-Bit integer */    protected abstract int getInt(int index);    /**     * Get a long value. This is not needed directly, but as a nice side-effect     * from GetDouble.     */    protected abstract long getLong(int index);    /**     * Get a double.     */    public double getDouble() {        long bitrep = getLong();        return Double.longBitsToDouble(bitrep);    }    public static class XDR extends ValueGetter {        public static final byte NUMBER = 0;        public XDR(ByteGetter data) {            super(data, NUMBER);        }        protected int getInt(int index) {            return (data.get(index) << 24) + (data.get(index + 1) << 16)                    + (data.get(index + 2) << 8) + data.get(index + 3);        }        protected long getLong(int index) {            return ((long) data.get(index) << 56) + ((long) data.get(index + 1) << 48)                    + ((long) data.get(index + 2) << 40) + ((long) data.get(index + 3) << 32)                    + ((long) data.get(index + 4) << 24) + ((long) data.get(index + 5) << 16)                    + ((long) data.get(index + 6) << 8) + ((long) data.get(index + 7) << 0);        }    }    public static class NDR extends ValueGetter {        public static final byte NUMBER = 1;        public NDR(ByteGetter data) {            super(data, NUMBER);        }        protected int getInt(int index) {            return (data.get(index + 3) << 24) + (data.get(index + 2) << 16)                    + (data.get(index + 1) << 8) + data.get(index);        }        protected long getLong(int index) {            return ((long) data.get(index + 7) << 56) + ((long) data.get(index + 6) << 48)                    + ((long) data.get(index + 5) << 40) + ((long) data.get(index + 4) << 32)                    + ((long) data.get(index + 3) << 24) + ((long) data.get(index + 2) << 16)                    + ((long) data.get(index + 1) << 8) + ((long) data.get(index) << 0);        }    }}