sascha@3013: package de.intevation.flys.utils; sascha@3013: sascha@3013: import java.util.ArrayList; sascha@3013: import java.util.Collections; sascha@3013: import java.util.List; sascha@3013: sascha@3013: import java.io.Serializable; sascha@3013: sascha@3013: public class KMIndex sascha@3013: implements Serializable sascha@3013: { sascha@3013: public static final double EPSILON = 1e-4; sascha@3013: sascha@3013: public static class Entry sascha@3013: implements Serializable, Comparable> sascha@3013: { sascha@3013: protected double km; sascha@3013: protected A value; sascha@3013: sascha@3013: public Entry(double km) { sascha@3013: this.km = km; sascha@3013: } sascha@3013: sascha@3013: public Entry(double km, A value) { sascha@3013: this.km = km; sascha@3013: this.value = value; sascha@3013: } sascha@3013: sascha@3013: public double getKm() { sascha@3013: return km; sascha@3013: } sascha@3013: sascha@3013: public A getValue() { sascha@3013: return value; sascha@3013: } sascha@3013: sascha@3013: public void setValue(A value) { sascha@3013: this.value = value; sascha@3013: } sascha@3013: sascha@3013: @Override sascha@3013: public int compareTo(Entry other) { sascha@3013: double diff = km - other.km; sascha@3013: if (diff < -EPSILON) return -1; sascha@3013: if (diff > +EPSILON) return +1; sascha@3013: return 0; sascha@3013: } sascha@3013: sascha@3013: public boolean epsilonEquals(double km) { sascha@3013: return Math.abs(this.km - km) < EPSILON; sascha@3013: } sascha@3013: } // class Entry sascha@3013: sascha@3013: sascha@3013: protected List> entries; sascha@3013: sascha@3013: public KMIndex() { sascha@3013: this(10); sascha@3013: } sascha@3013: sascha@3013: public KMIndex(int capacity) { sascha@3013: entries = new ArrayList>(capacity); sascha@3013: } sascha@3013: sascha@3013: public void add(double km, A value) { sascha@3013: entries.add(new Entry(km, value)); sascha@3013: } sascha@3013: sascha@3013: public void sort() { sascha@3013: Collections.sort(entries); sascha@3013: } sascha@3013: sascha@3013: public Entry search(double km) { sascha@3013: for (Entry entry: entries) { sascha@3013: if (entry.epsilonEquals(km)) { sascha@3013: return entry; sascha@3013: } sascha@3013: } sascha@3013: return null; sascha@3013: } sascha@3013: sascha@3013: public Entry binarySearch(double km) { sascha@3013: int index = Collections.binarySearch(entries, new Entry(km)); sascha@3013: return index >= 0 ? entries.get(index) : null; sascha@3013: } sascha@3013: } sascha@3013: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :