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package com.github.javaparser.symbolsolver.resolution.typeinference.bounds;
import com.github.javaparser.resolution.types.ResolvedType;
import com.github.javaparser.symbolsolver.resolution.typeinference.*;
import com.github.javaparser.utils.Pair;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import static com.github.javaparser.symbolsolver.resolution.typeinference.TypeHelper.isInferenceVariable;
import static com.github.javaparser.symbolsolver.resolution.typeinference.TypeHelper.isProperType;
/**
* S <: T, where at least one of S or T is an inference variable: S is a subtype of T
*
* @author Federico Tomassetti
*/
public class SubtypeOfBound extends Bound {
private ResolvedType s;
private ResolvedType t;
public SubtypeOfBound(ResolvedType s, ResolvedType t) {
if (!isInferenceVariable(s) && !isInferenceVariable(t)) {
throw new IllegalArgumentException("One of S or T should be an inference variable");
}
this.s = s;
this.t = t;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SubtypeOfBound that = (SubtypeOfBound) o;
if (!s.equals(that.s)) return false;
return t.equals(that.t);
}
@Override
public String toString() {
return "SubtypeOfBound{" +
"s=" + s +
", t=" + t +
'}';
}
@Override
public int hashCode() {
int result = s.hashCode();
result = 31 * result + t.hashCode();
return result;
}
public ResolvedType getS() {
return s;
}
@Override
public Set<InferenceVariable> usedInferenceVariables() {
Set<InferenceVariable> variables = new HashSet<>();
variables.addAll(TypeHelper.usedInferenceVariables(s));
variables.addAll(TypeHelper.usedInferenceVariables(t));
return variables;
}
public ResolvedType getT() {
return t;
}
@Override
public Optional<ProperUpperBound> isProperUpperBound() {
if (isInferenceVariable(s) && isProperType(t)) {
return Optional.of(new ProperUpperBound((InferenceVariable) s, t));
}
return Optional.empty();
}
@Override
public Optional<ProperLowerBound> isProperLowerBound() {
if (isProperType(s) && isInferenceVariable(t)) {
return Optional.of(new ProperLowerBound((InferenceVariable) t, s));
}
return Optional.empty();
}
@Override
public boolean isADependency() {
return !isProperLowerBound().isPresent() && !isProperUpperBound().isPresent();
}
@Override
public boolean isSatisfied(InferenceVariableSubstitution inferenceVariableSubstitution) {
throw new UnsupportedOperationException();
}
}
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