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Added a Bloomfilter and fixed some bugs

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This commit is contained in:
Ziver Koc 2009-02-08 21:32:06 +00:00
parent 9e3de28d45
commit 017a27931a
8 changed files with 425 additions and 24 deletions
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95
src/zutil/Converter.java
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@ -5,9 +5,10 @@ import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.BitSet;
public class Converter {
/**
* Converts an object to an array of bytes.
*
@ -26,7 +27,7 @@ public class Converter {
}
return baos.toByteArray();
}
/**
* Converts an array of bytes back to its constituent object. The
* input array is assumed to have been created from the original object.
@ -49,12 +50,13 @@ public class Converter {
}
return object;
}
/**
* Checks if the given interface is implemented in the object
* @param object The object to look for the interface
* @param interf The interface to look for
* @return True if the interface is implemented else false
*
* @param object the object to look for the interface
* @param interf the interface to look for
* @return true if the interface is implemented else false
*/
@SuppressWarnings("unchecked")
public static boolean isInstanceOf(Object object, Class interf){
@ -66,4 +68,85 @@ public class Converter {
}
return false;
}
// array neaded for byteToHex
private static char[] HEX_CHARS = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
/**
* Converts a byte Array to a Hex String
*
* @param raw the byte arrat to convert
* @return a Hex String
*/
public static String toHexString(byte[] raw){
StringBuffer ret = new StringBuffer();
for(byte b : raw){
ret.append(HEX_CHARS[(int) b & 0x0F ]);
ret.append(HEX_CHARS[(int) (b >>> 0x04)& 0x0F ]);
}
return ret.toString();
}
/**
* Converts the given byte to a String with 1's and 0's
*
* @param raw the byte to convert
* @return a String with 1's and 0's
*/
public static String toString(byte raw){
StringBuffer ret = new StringBuffer();
for(int i=128; i>0 ;i=( i<1 ? i=0 : i/2 ) ){
ret.append(( (raw & i) == 0 ? '0' : '1'));
}
return ret.toString();
}
/**
* Converts the given byte array to a String with 1's and 0's
*
* @param raw the byte array to convert
* @return a String with 1's and 0's
*/
public static String toString(byte[] raw){
StringBuffer ret = new StringBuffer();
for(byte b : raw){
for(int i=128; i>0 ;i=( i<1 ? i=0 : i/2 ) ){
ret.append(( (b & i) == 0 ? '0' : '1'));
}
}
return ret.toString();
}
/**
* Converts a BitSet to a Integer
*
* @param bits the BitSet to convert
* @return a Integer
*/
public static int toInt(BitSet bits){
int ret = 0;
for (int i = bits.nextSetBit(0); i >= 0; i = bits.nextSetBit(i+1)) {
ret += Math.pow(2, i);
}
return ret;
}
/**
* Converts a Integer to a BitSet
*
* @param i the Integer to convert
* @return a BitSet object
*/
public static BitSet toBitSet(int num){
BitSet ret = new BitSet();
String tmp = Integer.toBinaryString(num);
for(int i=0; i<tmp.length() ;i++){
ret.set(i , tmp.charAt(tmp.length()-i-1) != '0');
}
return ret;
}
}