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Venice, a Lisp implemented in Java
There is a newer version: 1.12.35
/*   __    __         _
 *   \ \  / /__ _ __ (_) ___ ___
 *    \ \/ / _ \ '_ \| |/ __/ _ \
 *     \  /  __/ | | | | (_|  __/
 *      \/ \___|_| |_|_|\___\___|
 *
 *
 * Copyright 2017-2024 Venice
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.jlangch.venice.impl.util;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;


public class StreamUtil {

    /**
     * Returns a {@link java.util.stream.Stream} from an {@link Iterable}
     *
     * @param  the type of the stream elements
     * @param in An {@link Iterable}
     * @return A {@link java.util.stream.Stream}
     */
    public static  Stream stream(final Iterable in) {
        return StreamSupport.stream(in.spliterator(), false);
    }

    /**
     * Returns a {@link java.util.stream.Stream} from an {@link Iterable}
     *
     * @param  the type of the stream elements
     * @param in An {@link Iterable}
     * @return A {@link java.util.stream.Stream}
     */
    public static  Stream stream(final Iterator in) {
        return StreamSupport.stream(
                Spliterators.spliteratorUnknownSize(
                in,
                Spliterator.ORDERED),
                false);
    }

    /**
     * Returns a {@link java.util.stream.Stream} from an {@link Enumeration}
     *
     * @param  the type of the stream elements
     * @param e An {@link Enumeration}
     * @return A {@link java.util.stream.Stream}
     */
    public static  Stream stream(final Enumeration e) {
        return StreamSupport.stream(
            Spliterators.spliteratorUnknownSize(
            new Iterator() {
                @Override
                public T next() {
                    return e.nextElement();
                }
                @Override
                public boolean hasNext() {
                    return e.hasMoreElements();
                }
            },
            Spliterator.ORDERED),
            false);
    }

}