public static void main(String[] args) {
Main obj = new Main();
String text = "Hello world!";
Range range = obj.encode(text);
System.out.println(range.getLow() + " " + range.getHigh());
System.out.println(obj.decode(text.length(), (range.getLow() + range.getHigh()) / 2));
}
void encodeChar(Range rangeChar, Range range) {
/*Range = high - low
High = low + range * high_range of the symbol being coded
Low = low + range * low_range of the symbol being coded*/
Double r = range.getHigh() - range.getLow();
Double high = range.getLow() + r * rangeChar.getHigh();
Double low = range.getLow() + r * rangeChar.getLow();
range.setHigh(high);
range.setLow(low);
}
String decode(Integer textLength, Double number) {
String str = "";
NavigableMap<Double, Character> sortedMap = new TreeMap<>();
rangeTable.forEach((k, v) -> sortedMap.put(v.getLow(), k));
for (int i = 0; i < textLength; i++) {
Character value = sortedMap.floorEntry(number).getValue();
str = str.concat(String.valueOf(value));
Range range = rangeTable.get(value);
number = (number - range.getLow()) / (range.getHigh() - range.getLow());
}
return str;
}
public int[] getDefinedInterval(int key) {
RangeHolder holder = new RangeHolder(key, key);
int pos = VectorUtil.binarySearch(ranges, holder, rangeComparator, true) - 1;
if (pos < 0 || pos >= ranges.size()) return null;
Range r = (Range) ranges.elementAt(pos);
if (r.getLow() <= key && r.getHigh() >= key) {
int[] out = new int[2];
out[0] = r.getLow();
out[1] = r.getHigh();
return out;
} else return null;
}
public double[] getInterval(int key) {
double[] output = new double[2];
RangeHolder holder = new RangeHolder(key, key + 1);
int pos = VectorUtil.binarySearch(ranges, holder, rangeComparator, true) - 1;
// System.err.println("ranges = "+ranges);
if (ranges.size() == 0) {
output[0] = Double.NEGATIVE_INFINITY;
output[1] = Double.POSITIVE_INFINITY;
return output;
}
if (pos < 0) {
output[0] = Double.NEGATIVE_INFINITY;
output[1] = (double) ((Range) ranges.elementAt(0)).getLow() - 1;
return output;
}
if (pos >= ranges.size()) {
output[0] = (double) ((Range) ranges.elementAt(ranges.size() - 1)).getHigh() + 1;
output[1] = Double.POSITIVE_INFINITY;
return output;
}
Range rh = (Range) ranges.elementAt(pos);
if (contains(rh, key)) {
output[0] = (double) rh.getLow();
output[1] = (double) rh.getHigh();
} else {
output[0] = (double) rh.getHigh() + 1;
if (pos < ranges.size() - 1) output[1] = ((Range) ranges.elementAt(pos + 1)).getLow() - 1;
else output[1] = Double.POSITIVE_INFINITY;
}
return output;
}
public String toString() {
StringBuffer out = new StringBuffer("(");
for (int i = 0; i < ranges.size(); i++) {
Range r = (Range) ranges.elementAt(i);
Object o = data.get(r);
if (i > 0) out.append(", ");
out.append("{[" + r.getLow() + ", " + r.getHigh() + "] = " + o.toString() + "}");
}
out.append(")");
return out.toString();
}
protected static boolean overlaps(Range a, Range b) {
return (contains(a, b.getLow())
|| contains(a, b.getHigh())
|| contains(b, a.getLow())
|| contains(b, a.getHigh()));
}
protected static boolean contains(Range r, int value) {
return value >= r.getLow() && value <= r.getHigh();
}
protected static int compare(Range a, Range b) {
if (a.getLow() < b.getLow()) return -1;
else if (a.getLow() > b.getLow()) return 1;
else return 0;
}
protected static boolean equals(Range a, Range b) {
return a.getLow() == b.getLow() && a.getHigh() == b.getHigh();
}