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24 changes: 0 additions & 24 deletions
24
generator/src/main/java/com/faforever/neroxis/generator/WeightedConstrainedOptions.java
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14 changes: 13 additions & 1 deletion
14
generator/src/main/java/com/faforever/neroxis/generator/WeightedOption.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,15 @@ | ||
| package com.faforever.neroxis.generator; | ||
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| public record WeightedOption<T>(T option, float weight) {} | ||
| import java.util.Objects; | ||
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| public record WeightedOption<T>( | ||
| T option, | ||
| float weight | ||
| ) { | ||
| public WeightedOption { | ||
| Objects.requireNonNull(option, "Option cannot be null"); | ||
| if (weight <= 0) { | ||
| throw new IllegalArgumentException("Weight must be greater than 0"); | ||
| } | ||
| } | ||
| } |
75 changes: 75 additions & 0 deletions
75
generator/src/main/java/com/faforever/neroxis/generator/WeightedOptionsWithFallback.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package com.faforever.neroxis.generator; | ||
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| import com.faforever.neroxis.generator.util.HasParameterConstraints; | ||
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| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.Random; | ||
| import java.util.function.Predicate; | ||
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| public sealed interface WeightedOptionsWithFallback<T> { | ||
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| @SafeVarargs | ||
| static <T extends HasParameterConstraints> WeightedOptionsWithFallback<T> of(T fallback, WeightedOption<T>... options) { | ||
| if (options.length == 0) { | ||
| return new WeightedOptionsWithFallback.Single<>(fallback); | ||
| } | ||
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| return new WeightedOptionsWithFallback.Multi<>(fallback, List.of(options)); | ||
| } | ||
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| default T select(Random random) { | ||
| return select(random, option -> true); | ||
| } | ||
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| default T select(Random random, Predicate<? super T> filter) { | ||
| return switch (this) { | ||
| case Single(T option) -> option; | ||
| case Multi(T fallbackOption, List<WeightedOption<T>> options) -> { | ||
| List<WeightedOption<T>> matchingOptions = options.stream() | ||
| .filter(weightedOption -> filter.test( | ||
| weightedOption.option())) | ||
| .toList(); | ||
| if (matchingOptions.isEmpty()) { | ||
| yield fallbackOption; | ||
| } | ||
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| double[] weights = matchingOptions.stream().mapToDouble(WeightedOption::weight).toArray(); | ||
| double[] cumulativeWeights = new double[weights.length]; | ||
| double sum = 0; | ||
| for (int i = 0; i < weights.length; i++) { | ||
| sum += weights[i]; | ||
| cumulativeWeights[i] = sum; | ||
| } | ||
| double value = random.nextDouble(sum); | ||
| int index = Arrays.binarySearch(cumulativeWeights, value); | ||
| if (index < 0) { | ||
| index = (index + 1) * -1; | ||
| } | ||
| yield matchingOptions.get(index).option(); | ||
| } | ||
| }; | ||
| } | ||
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| record Multi<T>( | ||
| T fallbackOption, | ||
| List<WeightedOption<T>> options | ||
| ) implements WeightedOptionsWithFallback<T> { | ||
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| public Multi { | ||
| Objects.requireNonNull(fallbackOption, "Fallback cannot be null"); | ||
| if (options.size() < 2) { | ||
| throw new IllegalArgumentException("At least two options must be provided"); | ||
| } | ||
| options = List.copyOf(options); | ||
| } | ||
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| } | ||
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| record Single<T>(T option) implements WeightedOptionsWithFallback<T> { | ||
| public Single { | ||
| Objects.requireNonNull(option, "Option cannot be null"); | ||
| } | ||
| } | ||
| } |
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