001/*
002 * Copyright 2010-2023 The jdependency developers.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.vafer.jdependency.utils;
017
018import java.util.Iterator;
019import java.util.stream.Stream;
020import java.util.stream.StreamSupport;
021import java.util.Spliterator;
022import java.util.Spliterators;
023import java.util.jar.JarEntry;
024import java.util.jar.JarInputStream;
025import java.io.IOException;
026
027/**
028 * internal - do not use
029 */
030
031public final class StreamUtils {
032
033    private StreamUtils() {}
034
035    // public static <T> Stream<T> asStream(Iterator<T> sourceIterator) {
036    //     return asStream(sourceIterator, false);
037    // }
038
039    // public static <T> Stream<T> asStream(Iterator<T> sourceIterator, boolean parallel) {
040    //     Iterable<T> iterable = () -> sourceIterator;
041    //     return StreamSupport.stream(iterable.spliterator(), parallel);
042    // }
043
044    public static Stream<JarEntry> asStream( final JarInputStream pInputStream ) {
045        return StreamSupport.stream(Spliterators.spliteratorUnknownSize(
046            new Iterator<JarEntry>() {
047
048                JarEntry entry = null;
049
050                public boolean hasNext() {
051                    try {
052                        if (entry == null) {
053                            entry = pInputStream.getNextJarEntry();
054                        }
055                        return entry != null;
056                    } catch(IOException e) {
057                        throw new RuntimeException(e);
058                    }
059                }
060
061                public JarEntry next() {
062                    try {
063                        JarEntry result = entry != null
064                          ? entry
065                          : pInputStream.getNextJarEntry();
066                        entry = null;
067                        return result;
068                    } catch(IOException e) {
069                        throw new RuntimeException(e);
070                    }
071                }
072
073            }, Spliterator.IMMUTABLE), false);
074    }
075}