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/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.jrtfs;
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import java.nio.file.DirectoryStream;
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import java.nio.file.ClosedDirectoryStreamException;
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import java.nio.file.DirectoryIteratorException;
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import java.nio.file.NotDirectoryException;
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import java.nio.file.Path;
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import java.util.Iterator;
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import java.util.Objects;
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import java.util.NoSuchElementException;
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import java.io.IOException;
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/**
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* DirectoryStream implementation for jrt file system implementations.
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*
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* @implNote This class needs to maintain JDK 8 source compatibility.
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*
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* It is used internally in the JDK to implement jimage/jrtfs access,
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* but also compiled and delivered as part of the jrtfs.jar to support access
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* to the jimage file provided by the shipped JDK by tools running on JDK 8.
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*/
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final class JrtDirectoryStream implements DirectoryStream<Path> {
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private final JrtPath dir;
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private final DirectoryStream.Filter<? super Path> filter;
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private volatile boolean isClosed;
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private volatile Iterator<Path> itr;
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JrtDirectoryStream(JrtPath dir,
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DirectoryStream.Filter<? super java.nio.file.Path> filter)
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throws IOException
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{
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this.dir = dir;
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if (!dir.jrtfs.isDirectory(dir, true)) { // sanity check
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throw new NotDirectoryException(dir.toString());
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}
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this.filter = filter;
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}
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@Override
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public synchronized Iterator<Path> iterator() {
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if (isClosed)
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throw new ClosedDirectoryStreamException();
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if (itr != null)
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throw new IllegalStateException("Iterator has already been returned");
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try {
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itr = dir.jrtfs.iteratorOf(dir, filter);
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} catch (IOException e) {
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throw new IllegalStateException(e);
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}
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return new Iterator<Path>() {
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private Path next;
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@Override
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public synchronized boolean hasNext() {
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if (isClosed)
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return false;
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return itr.hasNext();
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}
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@Override
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public synchronized Path next() {
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if (isClosed)
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throw new NoSuchElementException();
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return itr.next();
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}
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@Override
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public void remove() {
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throw new UnsupportedOperationException();
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}
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};
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}
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@Override
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public synchronized void close() throws IOException {
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isClosed = true;
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}
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}
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