8049367: Modular Run-Time Images
Reviewed-by: chegar, dfuchs, ihse, joehw, mullan, psandoz, wetmore
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, bradford.wetmore@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, james.laskey@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com, sundararajan.athijegannathan@oracle.com
/*
* Copyright (c) 2014, 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 jdk.internal.jrtfs;
import java.nio.file.DirectoryStream;
import java.nio.file.ClosedDirectoryStreamException;
import java.nio.file.DirectoryIteratorException;
import java.nio.file.NotDirectoryException;
import java.nio.file.Path;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.io.IOException;
final class JrtDirectoryStream implements DirectoryStream<Path> {
private final JrtFileSystem jrtfs;
private final byte[] path;
// prefix to be used for children of this directory
// so that child path are reported relatively (if needed)
private final String childPrefix;
private final DirectoryStream.Filter<? super Path> filter;
private volatile boolean isClosed;
private volatile Iterator<Path> itr;
JrtDirectoryStream(JrtPath jrtPath,
DirectoryStream.Filter<? super java.nio.file.Path> filter)
throws IOException
{
this.jrtfs = jrtPath.getFileSystem();
this.path = jrtPath.getResolvedPath();
// sanity check
if (!jrtfs.isDirectory(path))
throw new NotDirectoryException(jrtPath.toString());
// absolute path and does not have funky chars in front like /./java.base
if (jrtPath.isAbsolute() && (path.length == jrtPath.getPathLength())) {
childPrefix = null;
} else {
// cases where directory content needs to modified with prefix
// like ./java.base, /./java.base, java.base and so on.
String dirName = jrtPath.toString();
int idx = dirName.indexOf(JrtFileSystem.getString(path).substring(1));
childPrefix = dirName.substring(0, idx);
}
this.filter = filter;
}
@Override
public synchronized Iterator<Path> iterator() {
if (isClosed)
throw new ClosedDirectoryStreamException();
if (itr != null)
throw new IllegalStateException("Iterator has already been returned");
try {
itr = jrtfs.iteratorOf(path, childPrefix);
} catch (IOException e) {
throw new IllegalStateException(e);
}
return new Iterator<Path>() {
/*
* next Path value to return from this iterator.
* null value means hasNext() not called yet
* or last hasNext() returned false or resulted
* in exception. If last hasNext() returned true,
* then this field has non-null value.
*/
private Path next;
// get-and-clear and set-next by these methods
private Path getAndClearNext() {
assert next != null;
Path result = this.next;
this.next = null;
return result;
}
private void setNext(Path path) {
assert path != null;
this.next = path;
}
// if hasNext() returns true, 'next' field has non-null Path
@Override
public synchronized boolean hasNext() {
if (next != null) {
return true;
}
if (isClosed) {
return false;
}
if (filter == null) {
if (itr.hasNext()) {
setNext(itr.next());
return true;
} else {
return false;
}
} else {
while (itr.hasNext()) {
Path tmpPath = itr.next();
try {
if (filter.accept(tmpPath)) {
setNext(tmpPath);
return true;
}
} catch (IOException ioe) {
throw new DirectoryIteratorException(ioe);
}
}
return false;
}
}
@Override
public synchronized Path next() {
if (next != null) {
return getAndClearNext();
}
if (isClosed) {
throw new NoSuchElementException();
}
if (next == null && itr.hasNext()) {
// missing hasNext() between next() calls.
if (hasNext()) {
return getAndClearNext();
}
}
throw new NoSuchElementException();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public synchronized void close() throws IOException {
isClosed = true;
}
}