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There is a newer version: 9-dev-r4023-3

/*
 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.tools;

import java.io.File;
import java.nio.file.Path;
import java.util.Iterator;

/**
 * Package-private utility methods to convert between files and paths.
 *
 * @since 9
 */
class FileManagerUtils {
    private FileManagerUtils() { }

    static Iterable asPaths(final Iterable files) {
        return () -> new Iterator() {
            Iterator iter = files.iterator();

            @Override
            public boolean hasNext() {
                return iter.hasNext();
            }

            @Override
            public Path next() {
                return iter.next().toPath();
            }
        };
    }

    static Iterable asFiles(final Iterable paths) {
        return () -> new Iterator() {
            Iterator iter = paths.iterator();

            @Override
            public boolean hasNext() {
                return iter.hasNext();
            }

            @Override
            public File next() {
                Path p = iter.next();
                try {
                    return p.toFile();
                } catch (UnsupportedOperationException e) {
                    throw new IllegalArgumentException(p.toString(), e);
                }
            }
        };
    }
}