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Add a method to DfsOutputStream to read as an InputStream 

Change-Id: I0ec1f17a88bc14f22c10f9bc8d6f5b5118410e3a
stable-3.1
Dave Borowitz 12 years ago
parent
fe9f7aeb36
commit
b646578d89
5 changed files with 296 additions and 39 deletions
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  1. 1
      org.eclipse.jgit.test/META-INF/MANIFEST.MF
  2. 150
      org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsOutputStreamTest.java
  3. 59
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsOutputStream.java
  4. 85
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryOutputStream.java
  5. 40
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java

1
org.eclipse.jgit.test/META-INF/MANIFEST.MF
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@ -20,6 +20,7 @@ Import-Package: javaewah;version="[0.5.6,1.0.0)",
org.eclipse.jgit.fnmatch;version="[3.1.0,3.2.0)",
org.eclipse.jgit.ignore;version="[3.1.0,3.2.0)",
org.eclipse.jgit.internal;version="[3.1.0,3.2.0)",
org.eclipse.jgit.internal.storage.dfs;version="[3.1.0,3.2.0)",
org.eclipse.jgit.internal.storage.file;version="[3.1.0,3.2.0)",
org.eclipse.jgit.internal.storage.pack;version="[3.1.0,3.2.0)",
org.eclipse.jgit.java7;version="[3.1.0,3.2.0)";resolution:=optional,

150
org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsOutputStreamTest.java
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@ -0,0 +1,150 @@
/*
* Copyright (C) 2013, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.internal.storage.dfs;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.util.RawParseUtils;
import org.junit.Test;
public class DfsOutputStreamTest {
@Test
public void testReadEmpty() throws IOException {
DfsOutputStream os = newDfsOutputStream(8);
os.write(Constants.encode(""));
assertEquals("", readBuffered(os.openInputStream(0)));
assertEquals("", readByByte(os.openInputStream(0)));
assertEquals("", readBuffered(os.openInputStream(1)));
assertEquals("", readByByte(os.openInputStream(1)));
}
@Test
public void testRead() throws IOException {
DfsOutputStream os = newDfsOutputStream(8);
os.write(Constants.encode("data"));
assertEquals("data", readBuffered(os.openInputStream(0)));
assertEquals("data", readByByte(os.openInputStream(0)));
assertEquals("ata", readBuffered(os.openInputStream(1)));
assertEquals("ata", readByByte(os.openInputStream(1)));
assertEquals("ta", readBuffered(os.openInputStream(2)));
assertEquals("ta", readByByte(os.openInputStream(2)));
assertEquals("a", readBuffered(os.openInputStream(3)));
assertEquals("a", readByByte(os.openInputStream(3)));
assertEquals("", readBuffered(os.openInputStream(4)));
assertEquals("", readByByte(os.openInputStream(4)));
assertEquals("", readBuffered(os.openInputStream(5)));
assertEquals("", readByByte(os.openInputStream(5)));
}
@Test
public void testReadSmallBuffer() throws IOException {
DfsOutputStream os = newDfsOutputStream(8);
os.write(Constants.encode("data"));
assertEquals("data", readBuffered(os.openInputStream(0), 2));
assertEquals("ata", readBuffered(os.openInputStream(1), 2));
assertEquals("ta", readBuffered(os.openInputStream(2), 2));
assertEquals("a", readBuffered(os.openInputStream(3), 2));
assertEquals("", readBuffered(os.openInputStream(4), 2));
assertEquals("", readBuffered(os.openInputStream(5), 2));
}
@Test
public void testReadMultipleBlocks() throws IOException {
DfsOutputStream os = newDfsOutputStream(2);
os.write(Constants.encode("data"));
assertEquals("data", readBuffered(os.openInputStream(0)));
assertEquals("data", readByByte(os.openInputStream(0)));
assertEquals("ata", readBuffered(os.openInputStream(1)));
assertEquals("ata", readByByte(os.openInputStream(1)));
assertEquals("ta", readBuffered(os.openInputStream(2)));
assertEquals("ta", readByByte(os.openInputStream(2)));
assertEquals("a", readBuffered(os.openInputStream(3)));
assertEquals("a", readByByte(os.openInputStream(3)));
assertEquals("", readBuffered(os.openInputStream(4)));
assertEquals("", readByByte(os.openInputStream(4)));
assertEquals("", readBuffered(os.openInputStream(5)));
assertEquals("", readByByte(os.openInputStream(5)));
}
private static DfsOutputStream newDfsOutputStream(final int blockSize) {
return new InMemoryOutputStream() {
@Override
public int blockSize() {
return blockSize;
}
};
}
private static String readBuffered(InputStream is, int bufsize)
throws IOException {
StringBuilder out = new StringBuilder();
byte[] buf = new byte[bufsize];
while (true) {
int n = is.read(buf, 0, buf.length);
if (n < 0)
break;
out.append(RawParseUtils.decode(buf, 0, n));
}
return out.toString();
}
private static String readBuffered(InputStream is) throws IOException {
return readBuffered(is, 64);
}
private static String readByByte(InputStream is) throws IOException {
StringBuilder out = new StringBuilder();
while (true) {
int c = is.read();
if (c < 0)
break;
out.append(RawParseUtils.decode(new byte[] {(byte) c}));
}
return out.toString();
}
}

59
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsOutputStream.java
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@ -44,6 +44,7 @@
package org.eclipse.jgit.internal.storage.dfs;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
@ -96,4 +97,62 @@ public abstract class DfsOutputStream extends OutputStream {
* to DFS errors.
*/
public abstract int read(long position, ByteBuffer buf) throws IOException;
/**
* Open a stream to read back a portion of already written data.
* <p>
* The writing position of the output stream is not affected by a read. The
* input stream can be read up to the current writing position. Closing the
* returned stream has no effect on the underlying {@link DfsOutputStream}.
*
* @param position
* offset to read from.
* @return new input stream
*/
public InputStream openInputStream(final long position) {
return new ReadBackStream(position);
}
private class ReadBackStream extends InputStream {
private final ByteBuffer buf;
private long position;
private ReadBackStream(long position) {
int bs = blockSize();
this.position = position;
buf = ByteBuffer.allocate(bs > 0 ? bs : 8192);
buf.position(buf.limit());
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int cnt = 0;
while (0 < len) {
if (!buf.hasRemaining()) {
buf.rewind();
int nr = DfsOutputStream.this.read(position, buf);
if (nr < 0) {
buf.position(buf.limit());
break;
}
position += nr;
buf.flip();
}
int n = Math.min(len, buf.remaining());
buf.get(b, off, n);
off += n;
len -= n;
cnt += n;
}
if (cnt == 0 && len > 0) return -1;
return cnt;
}
@Override
public int read() throws IOException {
byte[] b = new byte[1];
int n = read(b);
return n == 1 ? b[0] & 0xff : -1;
}
}
}

85
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryOutputStream.java
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@ -0,0 +1,85 @@
/*
* Copyright (C) 2013, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.internal.storage.dfs;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
class InMemoryOutputStream extends DfsOutputStream {
private final ByteArrayOutputStream dst = new ByteArrayOutputStream();
private byte[] data;
@Override
public void write(byte[] buf, int off, int len) {
data = null;
dst.write(buf, off, len);
}
@Override
public int read(long position, ByteBuffer buf) {
byte[] d = getData();
int n = Math.min(buf.remaining(), d.length - (int) position);
if (n <= 0)
return -1;
buf.put(d, (int) position, n);
return n;
}
byte[] getData() {
if (data == null)
data = dst.toByteArray();
return data;
}
@Override
public void flush() {
// Default implementation does nothing;
}
@Override
public void close() {
flush();
}
}

40
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java
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@ -1,6 +1,5 @@
package org.eclipse.jgit.internal.storage.dfs;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
@ -117,7 +116,7 @@ public class InMemoryRepository extends DfsRepository {
protected DfsOutputStream writeFile(
DfsPackDescription desc, final PackExt ext) throws IOException {
final MemPack memPack = (MemPack) desc;
return new Out() {
return new InMemoryOutputStream() {
@Override
public void flush() {
memPack.fileMap.put(ext, getData());
@ -135,43 +134,6 @@ public class InMemoryRepository extends DfsRepository {
}
}
private abstract static class Out extends DfsOutputStream {
private final ByteArrayOutputStream dst = new ByteArrayOutputStream();
private byte[] data;
@Override
public void write(byte[] buf, int off, int len) {
data = null;
dst.write(buf, off, len);
}
@Override
public int read(long position, ByteBuffer buf) {
byte[] d = getData();
int n = Math.min(buf.remaining(), d.length - (int) position);
if (n == 0)
return -1;
buf.put(d, (int) position, n);
return n;
}
byte[] getData() {
if (data == null)
data = dst.toByteArray();
return data;
}
@Override
public abstract void flush();
@Override
public void close() {
flush();
}
}
private static class ByteArrayReadableChannel implements ReadableChannel {
private final byte[] data;

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