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a-base is a library of basic (hence the name) classes, most notably immutable collection classes with copy-on-write operations

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package com.ajjpj.abase.collection.immutable;

import com.ajjpj.abase.function.AFunction1;
import com.ajjpj.abase.function.AFunction2;
import com.ajjpj.abase.function.APredicate;
import com.ajjpj.abase.function.AStatement1;


/**
 * This interface represents collections that can be traversed "as whole" but not necessarily stepwise. Persistent collections
 *  are typical examples of this: They require cleanup (resource deallocation) after iterating is through, and exporting a
 *  java.util.Iterator can not guarantee that.
 *
 * @author arno
 */
public interface ATraversable extends AMonadicOps {
     void forEach(AStatement1 f) throws E;

    @Override  ATraversable filter(APredicate pred) throws E;
    @Override  ATraversable map(AFunction1 f) throws E;
    @Override  ATraversable flatMap(AFunction1, E> f) throws E;
     R foldLeft(R startValue, AFunction2 f) throws E;

    @Override  AOption find(APredicate pred) throws E;

    @Override  ATraversable flatten();

    @Override  boolean forAll(APredicate pred) throws E;
    @Override  boolean exists(APredicate pred) throws E;
}