Add a method to DfsOutputStream to read as an InputStream

Change-Id: I0ec1f17a88bc14f22c10f9bc8d6f5b5118410e3a

1 files changed, 150 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsOutputStreamTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsOutputStreamTest.java
new file mode 100644
index 0000000000..fc092e69d0
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsOutputStreamTest.java
@@ -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();
+	}
+}