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improve random choice of N cards

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remove gui calls from choosePile effect
This commit is contained in:
Maxmtg
2013-12-23 09:05:50 +00:00
parent 3d97768f71
commit c3c8fd7186
10 changed files with 160 additions and 187 deletions
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33
forge-core/src/main/java/forge/util/Aggregates.java
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@@ -79,8 +79,7 @@ public class Aggregates {
if( null == source )
return null;
Random rnd = MyRandom.getRandom();
if ( source instanceof List<?> )
{
if ( source instanceof List<?> ) {
List<T> src = (List<T>)source;
int len = src.size();
switch(len) {
@@ -88,33 +87,43 @@ public class Aggregates {
case 1: return src.get(0);
default: return src.get(rnd.nextInt(len));
}
}
int n = 0;
T candidate = null;
int lowest = Integer.MAX_VALUE;
for (final T item : source) {
if ((rnd.nextDouble() * ++n) < 1) {
int next = rnd.nextInt();
if(next < lowest) {
lowest = next;
candidate = item;
}
}
return candidate;
}
// Get several random values
// should improve to make 1 pass over source and track N candidates at once
public static final <T> List<T> random(final Iterable<T> source, final int count) {
final List<T> result = new ArrayList<T>();
for (int i = 0; i < count; ++i) {
final T toAdd = Aggregates.random(source);
if (toAdd == null) {
break;
final int[] randoms = new int[count];
for(int i = 0; i < count; i++) {
randoms[i] = Integer.MAX_VALUE;
result.add(null);
}
Random rnd = MyRandom.getRandom();
for(T item : source) {
int next = rnd.nextInt();
for(int i = 0; i < count; i++) {
if(next < randoms[i]) {
randoms[i] = next;
result.set(i, item);
break;
}
}
result.add(toAdd);
}
return result;
}
public static final <K, U> Iterable<U> uniqueByLast(final Iterable<U> source, final Function<U, K> fnUniqueKey) { // this might be exotic
final Map<K, U> uniques = new Hashtable<K, U>();
for (final U c : source) {