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• ImmutableSet.java

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com.shapesecurity.functional.data.ImmutableSet Maven / Gradle / Ivy

package com.shapesecurity.functional.data;

import com.shapesecurity.functional.F2;
import com.shapesecurity.functional.Unit;

import javax.annotation.CheckReturnValue;
import javax.annotation.Nonnull;

@CheckReturnValue
public class ImmutableSet {
    @Nonnull
    private final HashTable data;

    public int length() {
        return this.data.length;
    }

    ImmutableSet(@Nonnull HashTable data) {
        this.data = data;
    }

    public static  ImmutableSet emptyUsingEquality() {
        return new ImmutableSet<>(HashTable.emptyUsingEquality());
    }

    public static  ImmutableSet emptyUsingIdentity() {
        return new ImmutableSet<>(HashTable.emptyUsingIdentity());
    }

    @Deprecated
    public static  ImmutableSet empty() {
        return ImmutableSet.emptyUsingEquality();
    }

    @Deprecated
    public static  ImmutableSet emptyP() {
        return ImmutableSet.emptyUsingIdentity();
    }

    public  ImmutableSet put(@Nonnull B datum) {
        return new ImmutableSet<>(this.data.put(datum, Unit.unit));
    }

    @Nonnull
    public  ImmutableSet putAll(@Nonnull ImmutableList list) {
        return list.foldLeft(ImmutableSet::put, this);
    }

    public boolean contains(@Nonnull T datum) {
        return this.data.containsKey(datum);
    }

    public ImmutableSet remove(@Nonnull T datum) {
        return new ImmutableSet<>(this.data.remove(datum));
    }

    public  A foldAbelian(@Nonnull F2 f, @Nonnull A init) {
        return this.data.foldRight((p, acc) -> f.apply(p.left, acc), init);
    }

    public ImmutableSet union(@Nonnull ImmutableSet other) {
        return new ImmutableSet<>(this.data.merge(other.data));
    }

    // Does not guarantee ordering of elements in resulting list.
    public ImmutableList toList() {
        return this.foldAbelian((v, acc) -> acc.cons(v), ImmutableList.empty());
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object other) {
        return other instanceof ImmutableSet && this.data.length == ((ImmutableSet) other).data.length && this.data.foldLeft((memo, pair) -> memo && ((ImmutableSet) other).data.containsKey(pair.left), true);
    }
}