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error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/BuildNode.java
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error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/Node.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,61 +1,99 @@ | ||
| package tech.picnic.errorprone.bugpatterns; | ||
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| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
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| import com.google.auto.value.AutoValue; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.common.collect.ImmutableSet; | ||
| import com.google.common.collect.ImmutableSortedMap; | ||
| import com.google.common.collect.ImmutableSortedSet; | ||
| import com.google.common.collect.Maps; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.Consumer; | ||
| import java.util.function.Function; | ||
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| /** | ||
| * A node in an immutable tree. | ||
| * | ||
| * <p>The tree's edges are string-labeled, while its leaves store values of type {@code T}. | ||
| */ | ||
| @AutoValue | ||
| abstract class Node<T> { | ||
| static <T> Node<T> create(Map<String, Node<T>> children, ImmutableSet<T> candidateRules) { | ||
| return new AutoValue_Node<>(ImmutableMap.copyOf(children), candidateRules); | ||
| static <T> Node<T> create(Map<String, Node<T>> children, ImmutableList<T> values) { | ||
| return new AutoValue_Node<>(ImmutableSortedMap.copyOf(children), values); | ||
| } | ||
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| public abstract ImmutableMap<String, Node<T>> children(); | ||
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| public abstract ImmutableSet<T> candidateRules(); | ||
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| static <C> Node<C> createRefasterTemplateTree( | ||
| List<C> refasterRules, Function<C, ImmutableSet<ImmutableSortedSet<String>>> edgeExtractor) { | ||
| // XXX: Improve this method... | ||
| List<ImmutableSet<ImmutableSortedSet<String>>> beforeTemplateIdentifiers = | ||
| refasterRules.stream().map(edgeExtractor).collect(toImmutableList()); | ||
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| BuildNode<C> tree = BuildNode.create(); | ||
| for (int i = 0; i < refasterRules.size(); i++) { | ||
| tree.register(beforeTemplateIdentifiers.get(i), refasterRules.get(i)); | ||
| } | ||
| static <T> Node<T> create( | ||
| List<T> values, Function<T, ImmutableSet<ImmutableSortedSet<String>>> pathExtractor) { | ||
| BuildNode<T> tree = BuildNode.create(); | ||
| tree.register(values, pathExtractor); | ||
| return tree.immutable(); | ||
| } | ||
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| void collectCandidateTemplates(ImmutableList<String> sourceIdentifiers, Consumer<T> sink) { | ||
| candidateRules().forEach(sink); | ||
| abstract ImmutableMap<String, Node<T>> children(); | ||
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| if (sourceIdentifiers.isEmpty() || children().isEmpty()) { | ||
| abstract ImmutableList<T> values(); | ||
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| void collectCandidateTemplates(ImmutableList<String> candidateEdges, Consumer<T> sink) { | ||
| values().forEach(sink); | ||
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| if (candidateEdges.isEmpty() || children().isEmpty()) { | ||
| return; | ||
| } | ||
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| if (children().size() < sourceIdentifiers.size()) { | ||
| if (children().size() < candidateEdges.size()) { | ||
| for (Map.Entry<String, Node<T>> e : children().entrySet()) { | ||
| if (sourceIdentifiers.contains(e.getKey())) { | ||
| e.getValue().collectCandidateTemplates(sourceIdentifiers, sink); | ||
| if (candidateEdges.contains(e.getKey())) { | ||
| e.getValue().collectCandidateTemplates(candidateEdges, sink); | ||
| } | ||
| } | ||
| } else { | ||
| ImmutableList<String> remainingSourceCandidateEdges = | ||
| sourceIdentifiers.subList(1, sourceIdentifiers.size()); | ||
| Node<T> child = children().get(sourceIdentifiers.get(0)); | ||
| ImmutableList<String> remainingCandidateEdges = | ||
| candidateEdges.subList(1, candidateEdges.size()); | ||
| Node<T> child = children().get(candidateEdges.get(0)); | ||
| if (child != null) { | ||
| child.collectCandidateTemplates(remainingSourceCandidateEdges, sink); | ||
| child.collectCandidateTemplates(remainingCandidateEdges, sink); | ||
| } | ||
| collectCandidateTemplates(remainingCandidateEdges, sink); | ||
| } | ||
| } | ||
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| @AutoValue | ||
| @SuppressWarnings("AutoValueImmutableFields" /* Type is used only during `Node` construction. */) | ||
| abstract static class BuildNode<T> { | ||
| static <T> BuildNode<T> create() { | ||
| return new AutoValue_Node_BuildNode<>(new HashMap<>(), new ArrayList<>()); | ||
| } | ||
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| abstract Map<String, BuildNode<T>> children(); | ||
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| abstract List<T> values(); | ||
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| private void register( | ||
| List<T> values, Function<T, ImmutableSet<ImmutableSortedSet<String>>> pathsExtractor) { | ||
| for (T value : values) { | ||
| for (ImmutableSet<String> path : pathsExtractor.apply(value)) { | ||
| registerPath(value, path.asList()); | ||
| } | ||
| } | ||
| collectCandidateTemplates(remainingSourceCandidateEdges, sink); | ||
| } | ||
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| private void registerPath(T value, ImmutableList<String> path) { | ||
| path.stream() | ||
| .findFirst() | ||
| .ifPresentOrElse( | ||
| edge -> | ||
| children() | ||
| .computeIfAbsent(edge, k -> BuildNode.create()) | ||
| .registerPath(value, path.subList(1, path.size())), | ||
| () -> values().add(value)); | ||
| } | ||
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| private Node<T> immutable() { | ||
| return Node.create( | ||
| Maps.transformValues(children(), BuildNode::immutable), ImmutableList.copyOf(values())); | ||
| } | ||
| } | ||
| } |
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