org.eclipse.jgit.test/tst/org/eclipse/jgit/util/TemporaryBufferTest.java

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package org.eclipse.jgit.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;

import org.eclipse.jgit.junit.TestRng;

import junit.framework.TestCase;

public class TemporaryBufferTest extends TestCase {
	public void testEmpty() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		try {
			b.close();
			assertEquals(0, b.length());
			final byte[] r = b.toByteArray();
			assertNotNull(r);
			assertEquals(0, r.length);
		} finally {
			b.destroy();
		}
	}

	public void testOneByte() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte test = (byte) new TestRng(getName()).nextInt();
		try {
			b.write(test);
			b.close();
			assertEquals(1, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(1, r.length);
				assertEquals(test, r[0]);
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(1, r.length);
				assertEquals(test, r[0]);
			}
		} finally {
			b.destroy();
		}
	}

	public void testOneBlock_BulkWrite() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.Block.SZ);
		try {
			b.write(test, 0, 2);
			b.write(test, 2, 4);
			b.write(test, 6, test.length - 6 - 2);
			b.write(test, test.length - 2, 2);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testOneBlockAndHalf_BulkWrite() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.Block.SZ * 3 / 2);
		try {
			b.write(test, 0, 2);
			b.write(test, 2, 4);
			b.write(test, 6, test.length - 6 - 2);
			b.write(test, test.length - 2, 2);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testOneBlockAndHalf_SingleWrite() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.Block.SZ * 3 / 2);
		try {
			for (int i = 0; i < test.length; i++)
				b.write(test[i]);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testOneBlockAndHalf_Copy() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.Block.SZ * 3 / 2);
		try {
			final ByteArrayInputStream in = new ByteArrayInputStream(test);
			b.write(in.read());
			b.copy(in);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testLarge_SingleWrite() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.DEFAULT_IN_CORE_LIMIT * 3);
		try {
			b.write(test);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testInCoreLimit_SwitchOnAppendByte() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.DEFAULT_IN_CORE_LIMIT + 1);
		try {
			b.write(test, 0, test.length - 1);
			b.write(test[test.length - 1]);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testInCoreLimit_SwitchBeforeAppendByte() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.DEFAULT_IN_CORE_LIMIT * 3);
		try {
			b.write(test, 0, test.length - 1);
			b.write(test[test.length - 1]);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testInCoreLimit_SwitchOnCopy() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final byte[] test = new TestRng(getName())
				.nextBytes(TemporaryBuffer.DEFAULT_IN_CORE_LIMIT * 2);
		try {
			final ByteArrayInputStream in = new ByteArrayInputStream(test,
					TemporaryBuffer.DEFAULT_IN_CORE_LIMIT, test.length
							- TemporaryBuffer.DEFAULT_IN_CORE_LIMIT);
			b.write(test, 0, TemporaryBuffer.DEFAULT_IN_CORE_LIMIT);
			b.copy(in);
			b.close();
			assertEquals(test.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(test.length, r.length);
				assertTrue(Arrays.equals(test, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testDestroyWhileOpen() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		try {
			b.write(new TestRng(getName())
					.nextBytes(TemporaryBuffer.DEFAULT_IN_CORE_LIMIT * 2));
		} finally {
			b.destroy();
		}
	}

	public void testRandomWrites() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.LocalFile();
		final TestRng rng = new TestRng(getName());
		final int max = TemporaryBuffer.DEFAULT_IN_CORE_LIMIT * 2;
		final byte[] expect = new byte[max];
		try {
			int written = 0;
			boolean onebyte = true;
			while (written < max) {
				if (onebyte) {
					final byte v = (byte) rng.nextInt();
					b.write(v);
					expect[written++] = v;
				} else {
					final int len = Math
							.min(rng.nextInt() & 127, max - written);
					final byte[] tmp = rng.nextBytes(len);
					b.write(tmp, 0, len);
					System.arraycopy(tmp, 0, expect, written, len);
					written += len;
				}
				onebyte = !onebyte;
			}
			assertEquals(expect.length, written);
			b.close();

			assertEquals(expect.length, b.length());
			{
				final byte[] r = b.toByteArray();
				assertNotNull(r);
				assertEquals(expect.length, r.length);
				assertTrue(Arrays.equals(expect, r));
			}
			{
				final ByteArrayOutputStream o = new ByteArrayOutputStream();
				b.writeTo(o, null);
				o.close();
				final byte[] r = o.toByteArray();
				assertEquals(expect.length, r.length);
				assertTrue(Arrays.equals(expect, r));
			}
		} finally {
			b.destroy();
		}
	}

	public void testHeap() throws IOException {
		final TemporaryBuffer b = new TemporaryBuffer.Heap(2 * 8 * 1024);
		final byte[] r = new byte[8 * 1024];
		b.write(r);
		b.write(r);
		try {
			b.write(1);
			fail("accepted too many bytes of data");
		} catch (IOException e) {
			assertEquals("In-memory buffer limit exceeded", e.getMessage());
		}
	}
}