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Immutable Clojure collections and a Transformation abstraction for Java 8+, immutably, type-safely, and with good performance.

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package org.organicdesign.fp.collections;

import java.util.Map;

/** An immutable map with no guarantees about its ordering. */
public interface ImMap extends BaseUnsortedMap {

    /** Returns a new map with the given key/value added */
    @Override ImMap assoc(K key, V val);

    /** Returns a new map with an immutable copy of the given entry added */
    @Override default ImMap assoc(Map.Entry entry) {
        return assoc(entry.getKey(), entry.getValue());
    }

    /** Returns a new map with the given key/value removed */
    @Override ImMap without(K key);

    /**
     Returns a view of the mappings contained in this map.  The set should actually contain
     UnmodMap.Entry items, but that return signature is illegal in Java, so you'll just have to
     remember.
     */
    @Override default ImSet> entrySet() {
        return map(e -> (Map.Entry) e)
                .toImSet();
    }

    /** Returns an immutable view of the keys contained in this map. */
    @Override default ImSet keySet() {
        return mutable().keySet().immutable();
    }

    /** Returns a mutable version of this mutable map. */
    MutableMap mutable();

}