adding D-gap parameter

Signed-off-by: floodfill <canly.xiao@gmail.com>

DataGenerator.java

@@ -1,3 +1,5 @@
+package com.xiaokan.generator;
+
 import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
 import java.io.EOFException;
@@ -11,22 +13,21 @@ public class DataGenerator {
 
 	public static int maxNumberOfPostingsInList = 10000;
 
-	public static boolean highByteFirst = false;
+	public static int minDGap = 100, maxDGap = 200;
 
 	public static void main(String[] args) throws IOException {
-
 		FileOutputStream fos = new FileOutputStream("d:/data.dat");
 		Random rand = new Random();
 		BufferedOutputStream fout = new BufferedOutputStream(fos);
-		DataInputStream dis;
 		for (int i = 0; i < numberOfLists; i++) {
 			int nOPIL = rand.nextInt(maxNumberOfPostingsInList);
 			int buf[] = int2bytes(nOPIL);
 			for (int k = 0; k < 4; k++)
 				fout.write(buf[k]);
-
+			int now = 1;
 			for (int j = 1; j <= nOPIL; j++) {
-				buf = int2bytes(j);
+				buf = int2bytes(now);
+				now += rand.nextInt(maxDGap - minDGap) + maxDGap;
 				for (int k = 0; k < 4; k++)
 					fout.write(buf[k]);
 			}
@@ -36,10 +37,10 @@ public static void main(String[] args) throws IOException {
 
 	public static int[] int2bytes(int v) {
 		int b[] = new int[4];
-			b[3] = (v >>> 24) & 0xFF;
-			b[2] = (v >>> 16) & 0xFF;
-			b[1] = (v >>> 8) & 0xFF;
-			b[0] = (v >>> 0) & 0xFF;		
+		b[3] = (v >>> 24) & 0xFF;
+		b[2] = (v >>> 16) & 0xFF;
+		b[1] = (v >>> 8) & 0xFF;
+		b[0] = (v >>> 0) & 0xFF;
 		return b;
 	}
 

readme.md

@@ -7,6 +7,7 @@ files overview:
 
 2> checkIncrease.cpp  // check whether the data to be compressed is valid
 
+
 3> Pro2_Inverted_Indexing.tar.bz2 // Inverted list analyzer and merger
 
 4> DataGenerator.java // Simple Inverted List data generator