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The OpenTripPlanner multimodal journey planning system

There is a newer version: 2.5.0

package org.opentripplanner.util;

/**
 * A compact bit set utility class. It rely on the client to store the bit set himself (either as a
 * byte, short, int or long, depending on the amount of bits needed), to prevent having to store a
 * reference and create another heavy object instance such as with the BitSet class.
 * 
 * Usage is rather simple:
 * 
 *  * 
 * short flags; // or int, long, byte
 * 
 * public boolean isFooBar() {
 *     return BitSetUtils.get(flags, FOOBAR_INDEX);
 * }
 * 
 * public void setFooBar(boolean foobar) {
 *     flags = BitSetUtils.set(flags, FOOBAR_INDEX, foobar);
 * }
 * 
 * 
 * 
 * @author laurent
 * 
 */
public final class BitSetUtils {

    public static boolean get(byte bitset, int index) {
        return (bitset & (1 << index)) != 0;
    }

    public static byte set(byte bitset, int index, boolean value) {
        if (value) {
            bitset |= (1 << index);
        }
        else {
            bitset &= ~(1 << index);
        }
        return bitset;
    }

    public static boolean get(short bitset, int index) {
        return (bitset & (1 << index)) != 0;
    }

    public static short set(short bitset, int index, boolean value) {
        if (value) {
            bitset |= (1 << index);
        }
        else {
            bitset &= ~(1 << index);
        }
        return bitset;
    }

    public static boolean get(int bitset, int index) {
        return (bitset & (1 << index)) != 0;
    }

    public static int set(int bitset, int index, boolean value) {
        if (value) {
            bitset |= (1 << index);
        }
        else {
            bitset &= ~(1 << index);
        }
        return bitset;
    }

    public static boolean get(long bitset, int index) {
        return (bitset & (1L << index)) != 0;
    }

    public static long set(long bitset, int index, boolean value) {
        if (value) {
            bitset |= (1L << index);
        }
        else {
            bitset &= ~(1L << index);
        }
        return bitset;
    }

}