Flag utilities for parcelable or packing/unpacking in general

FlagUtils.java

public class FlagUtils {

    /**
     * Packs booleans into an integer
     *
     * This does not check if the number of booleans is less then the number of bits in the integer
     *
     * @param params the booleans
     *
     * @return the packed integer
     */
    public static int pack( boolean... params ) {
        int result = 0;
        int flag = 0;

        for ( boolean param : params )
        {
            result += param ? (1 << flag) : 0;
            flag++;
        }

        return result;
    }

    /**
     * Unpacks booleans from an integer
     *
     * This does not check if the count is less then the number of bits in the integer
     *
     * @param flags the packed integer
     * @param count the number of packed booleans
     *
     * @return the booleans
     */
    public static boolean[] unpack( int flags, int count ) {
        boolean[] result = new boolean[count];
        for ( int i = 0; i < count; i++ )
            result[i] = isSet( flags, i );
        return result;
    }

    /**
     * Checks if a flag at position {@code flag} is set
     *
     * @param flags the packed integer
     * @param flag the flag position
     *             
     * @return true if it is
     */
    public static boolean isSet( int flags, int flag ) {
        int mask = (1 << flag);
        return ( flags & mask ) == mask;
    }

}