org.postgis.binary.ValueSetter Maven / Gradle / Ivy

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PostGIS adds support for geographic objects to the PostgreSQL object-relational database.
There is a newer version: 2023.1.0
/*
 * ValueSetter.java
 * 
 * PostGIS extension for PostgreSQL JDBC driver - Binary Parser
 * 
 * (C) 2005 Markus Schaber, [email protected]
 *
 * (C) 2015 Phillip Ross, [email protected]
 * 
 * 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, or (at your option) any later version.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 */

package org.postgis.binary;

public abstract class ValueSetter {
    ByteSetter data;
    int position=0;
    public final byte endian;

    public ValueSetter(ByteSetter data, byte endian) {
        this.data = data;
        this.endian = endian;
    }

    /**
     * Set a byte, should be equal for all endians
     *
     * @param value byte value to be set with.
     */
    public void setByte(byte value) {
        data.set(value, position);
        position += 1;
    }

    public void setInt(int value) {
        setInt(value, position);
        position += 4;
    }

    public void setLong(long value) {
        setLong(value, position);
        position += 8;
    }

    /**
     * Set a 32-Bit integer
     *
     * @param value int value to be set with
     * @param index int value for the index
     *
     */
    protected abstract void setInt(int value, int index);

    /**
     * Set a long value. This is not needed directly, but as a nice side-effect
     * from GetDouble.
     *
     * @param data int value to be set with
     * @param index int value for the index
     */
    protected abstract void setLong(long data, int index);

    /**
     * Set a double.
     *
     * @param data double value to be set with
     */
    public void setDouble(double data) {
        long bitrep = Double.doubleToLongBits(data);
        setLong(bitrep);
    }

    public String toString() {
        String name = getClass().getName();
        int pointpos = name.lastIndexOf('.');
        String klsName = name.substring(pointpos+1);
        return klsName+"('"+(data==null?"NULL":data.toString()+"')");
    }
    
    public static class XDR extends ValueSetter {
        public static final byte NUMBER = 0;

        public XDR(ByteSetter data) {
            super(data, NUMBER);
        }

        protected void setInt(int value, int index) {
            data.set((byte) (value >>> 24), index);
            data.set((byte) (value >>> 16), index + 1);
            data.set((byte) (value >>> 8), index + 2);
            data.set((byte) value, index + 3);
        }

        protected void setLong(long value, int index) {
            data.set((byte) (value >>> 56), index);
            data.set((byte) (value >>> 48), index + 1);
            data.set((byte) (value >>> 40), index + 2);
            data.set((byte) (value >>> 32), index + 3);
            data.set((byte) (value >>> 24), index + 4);
            data.set((byte) (value >>> 16), index + 5);
            data.set((byte) (value >>> 8), index + 6);
            data.set((byte) value, index + 7);
        }
    }

    public static class NDR extends ValueSetter {
        public static final byte NUMBER = 1;

        public NDR(ByteSetter data) {
            super(data, NUMBER);
        }

        protected void setInt(int value, int index) {
            data.set((byte) (value >>> 24), index + 3);
            data.set((byte) (value >>> 16), index + 2);
            data.set((byte) (value >>> 8), index + 1);
            data.set((byte) value, index);
        }

        protected void setLong(long value, int index) {
            data.set((byte) (value >>> 56), index + 7);
            data.set((byte) (value >>> 48), index + 6);
            data.set((byte) (value >>> 40), index + 5);
            data.set((byte) (value >>> 32), index + 4);
            data.set((byte) (value >>> 24), index + 3);
            data.set((byte) (value >>> 16), index + 2);
            data.set((byte) (value >>> 8), index + 1);
            data.set((byte) value, index);
        }
    }
}