felix@1163: package de.intevation.flys.utils;
felix@1163: 
felix@1163: import java.util.Random;
felix@1163: 
felix@1163: import de.intevation.flys.artifacts.model.WKms;
felix@1163: 
felix@1163: public class DataUtil
felix@1163: {
felix@1163:     // TODO: resolve duplicate in WQKms
felix@1163:     public static boolean guessWaterIncreasing(WKms wkms) {
felix@1163:         return guessWaterIncreasing(wkms, 0.05f);
felix@1163:     }
felix@1163: 
felix@1163:     // TODO: resolve duplicate in WQKms
felix@1163:     public static boolean guessWaterIncreasing(WKms wkms, float factor) {
felix@1163:         int N = wkms.size();
felix@1163:         if (N < 2) return false;
felix@1163:     
felix@1163:         int samples = (int)(factor*N) + 1;
felix@1163:     
felix@1163:         int up = 0;
felix@1163:     
felix@1163:         Random rand = new Random();
felix@1163:     
felix@1163:         for (int i = 0; i < samples; ++i) {
felix@1163:             int    pos2 = rand.nextInt(N-1) + 1;
felix@1163:             if (pos2 == 0) continue;
felix@1163:             int    pos1 = rand.nextInt(pos2);
felix@1163:             double w1   = wkms.getW(pos1);
felix@1163:             double w2   = wkms.getW(pos2);
felix@1163:             if (w2 > w1) ++up;
felix@1163:         }
felix@1163:     
felix@1163:         return up > samples/2;
felix@1163:     }
felix@1163: }