/*
* Copyright (c) 2001, 2018, 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.jfr.internal;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
final class ChunkInputStream extends InputStream {
private final Iterator<RepositoryChunk> chunks;
private RepositoryChunk currentChunk;
private InputStream stream;
ChunkInputStream(List<RepositoryChunk> chunks) throws IOException {
List<RepositoryChunk> l = new ArrayList<>(chunks.size());
for (RepositoryChunk c : chunks) {
c.use(); // keep alive while we're reading.
l.add(c);
}
this.chunks = l.iterator();
nextStream();
}
@Override
public int available() throws IOException {
if (stream != null) {
return stream.available();
}
return 0;
}
private boolean nextStream() throws IOException {
if (!nextChunk()) {
return false;
}
stream = new BufferedInputStream(SecuritySupport.newFileInputStream(currentChunk.getFile()));
return true;
}
private boolean nextChunk() {
if (!chunks.hasNext()) {
return false;
}
currentChunk = chunks.next();
return true;
}
@Override
public int read() throws IOException {
while (true) {
if (stream != null) {
int r = stream.read();
if (r != -1) {
return r;
}
stream.close();
currentChunk.release();
stream = null;
currentChunk = null;
}
if (!nextStream()) {
return -1;
}
}
}
@Override
public void close() throws IOException {
if (stream != null) {
stream.close();
stream = null;
}
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