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JDK8/Java8源码在线阅读 / sun / nio / fs / AbstractPath.java
/*
 * Copyright (c) 2007, 2011, 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 sun.nio.fs;

import java.nio.file.*;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Base implementation class of {@code Path}.
 */

abstract class AbstractPath implements Path {
    protected AbstractPath() { }

    @Override
    public final boolean startsWith(String other) {
        return startsWith(getFileSystem().getPath(other));
    }

    @Override
    public final boolean endsWith(String other) {
        return endsWith(getFileSystem().getPath(other));
    }

    @Override
    public final Path resolve(String other) {
        return resolve(getFileSystem().getPath(other));
    }

    @Override
    public final Path resolveSibling(Path other) {
        if (other == null)
            throw new NullPointerException();
        Path parent = getParent();
        return (parent == null) ? other : parent.resolve(other);
    }

    @Override
    public final Path resolveSibling(String other) {
        return resolveSibling(getFileSystem().getPath(other));
    }

    @Override
    public final Iterator<Path> iterator() {
        return new Iterator<Path>() {
            private int i = 0;
            @Override
            public boolean hasNext() {
                return (i < getNameCount());
            }
            @Override
            public Path next() {
                if (i < getNameCount()) {
                    Path result = getName(i);
                    i++;
                    return result;
                } else {
                    throw new NoSuchElementException();
                }
            }
            @Override
            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }


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