org.limewire.collection
Interface BitField

All Known Implementing Classes:

AndView, BitFieldSet, NandView, NorView, NotView, OrView, XorView

public interface BitField

Defines the interface to manipulate a fixed size field of bits. BitField declares methods to return the location where a bit is either set (equal to 1) or clear (equal to 0). The BitField interface has a methods for returning the bit value at a particular location and the maximum size of the field of bits. Also, BitField has a cardinality method for working with sets.

BitFieldSet, AndView, OrView, XorView and NotView implement BitField. The subclasses perform various operations on the bits.

    void sampleCodeBitField(){

        BitSet bs = new BitSet();
        bs.set(3);
        bs.set(1);
        BitField completed = new BitFieldSet(bs, 64);
        NotView uncompleted = new NotView(completed);

        printBitField(completed,   "  completed");
        printBitField(uncompleted, "uncompleted");

        System.out.println("Completed " + completed.cardinality() + " out of " + completed.maxSize() + " tasks.");
        System.out.println("Uncompleted tasks: " + new NotView(completed).cardinality() + ".");
    }

    void printBitField(BitField bf, String bfName){
        System.out.print(bfName + ": ");
        for(int i = 0; i < bf.maxSize(); i++){
            int j = 0;
            if(bf.get(i))
                j = 1;          
            System.out.print(j);
        }
        System.out.println(""); 
    }
    Output:
          completed: 0101000000000000000000000000000000000000000000000000000000000000
        uncompleted: 1010111111111111111111111111111111111111111111111111111111111111
        Completed 2 out of 64 tasks.
        Uncompleted tasks: 62.

Method Summary

int	cardinality()
boolean	get(int i)
int	maxSize()
int	nextClearBit(int i)
int	nextSetBit(int i)

Method Detail

get

boolean get(int i)

nextSetBit

int nextSetBit(int i)

Returns:

index of next set bit from index i or -1 if there is no bit left

nextClearBit

int nextClearBit(int i)

cardinality

int cardinality()

maxSize

int maxSize()