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* "License"); you may not use this file except in compliance *
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* http://www.apache.org/licenses/LICENSE-2.0 *
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package org.apache.james.mime4j.util;
import org.apache.james.mime4j.util.ByteArrayBuffer;
import junit.framework.TestCase;
/**
* Unit tests for {@link ByteArrayBuffer}.
*/
public class TestByteArrayBuffer extends TestCase {
public void testConstructor() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(16);
assertEquals(16, buffer.capacity());
assertEquals(0, buffer.length());
assertNotNull(buffer.buffer());
assertEquals(16, buffer.buffer().length);
try {
new ByteArrayBuffer(-1);
fail("IllegalArgumentException should have been thrown");
} catch (IllegalArgumentException ex) {
// expected
}
}
public void testSimpleAppend() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(16);
assertEquals(16, buffer.capacity());
assertEquals(0, buffer.length());
byte[] b1 = buffer.toByteArray();
assertNotNull(b1);
assertEquals(0, b1.length);
assertTrue(buffer.isEmpty());
assertFalse(buffer.isFull());
byte[] tmp = new byte[] { 1, 2, 3, 4};
buffer.append(tmp, 0, tmp.length);
assertEquals(16, buffer.capacity());
assertEquals(4, buffer.length());
assertFalse(buffer.isEmpty());
assertFalse(buffer.isFull());
byte[] b2 = buffer.toByteArray();
assertNotNull(b2);
assertEquals(4, b2.length);
for (int i = 0; i < tmp.length; i++) {
assertEquals(tmp[i], b2[i]);
assertEquals(tmp[i], buffer.byteAt(i));
}
buffer.clear();
assertEquals(16, buffer.capacity());
assertEquals(0, buffer.length());
assertTrue(buffer.isEmpty());
assertFalse(buffer.isFull());
}
public void testExpandAppend() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(4);
assertEquals(4, buffer.capacity());
byte[] tmp = new byte[] { 1, 2, 3, 4};
buffer.append(tmp, 0, 2);
buffer.append(tmp, 0, 4);
buffer.append(tmp, 0, 0);
assertEquals(8, buffer.capacity());
assertEquals(6, buffer.length());
buffer.append(tmp, 0, 4);
assertEquals(16, buffer.capacity());
assertEquals(10, buffer.length());
}
public void testInvalidAppend() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(4);
buffer.append((byte[])null, 0, 0);
byte[] tmp = new byte[] { 1, 2, 3, 4};
try {
buffer.append(tmp, -1, 0);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.append(tmp, 0, -1);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.append(tmp, 0, 8);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.append(tmp, 10, Integer.MAX_VALUE);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.append(tmp, 2, 4);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
}
public void testAppendOneByte() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(4);
assertEquals(4, buffer.capacity());
byte[] tmp = new byte[] { 1, 127, -1, -128, 1, -2};
for (byte b : tmp) {
buffer.append(b);
}
assertEquals(8, buffer.capacity());
assertEquals(6, buffer.length());
for (int i = 0; i < tmp.length; i++) {
assertEquals(tmp[i], buffer.byteAt(i));
}
}
public void testSetLength() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(4);
buffer.setLength(2);
assertEquals(2, buffer.length());
}
public void testSetInvalidLength() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(4);
try {
buffer.setLength(-2);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.setLength(200);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
}
public void testRemove() throws Exception {
ByteArrayBuffer b = new ByteArrayBuffer(16);
byte tmp[] = "--+++-".getBytes("US-ASCII");
b.append(tmp, 0, tmp.length);
b.remove(2, 3);
assertEquals(3, b.length());
assertEquals("---", new String(b.buffer(), 0, b.length(), "US-ASCII"));
b.remove(2, 1);
b.remove(1, 1);
b.remove(0, 1);
assertEquals(0, b.length());
tmp = "+++---".getBytes("US-ASCII");
b.append(tmp, 0, tmp.length);
b.remove(0, 3);
assertEquals(3, b.length());
assertEquals("---", new String(b.buffer(), 0, b.length(), "US-ASCII"));
b.remove(0, 3);
assertEquals(0, b.length());
tmp = "---+++".getBytes("US-ASCII");
b.append(tmp, 0, tmp.length);
b.remove(3, 3);
assertEquals(3, b.length());
assertEquals("---", new String(b.buffer(), 0, b.length(), "US-ASCII"));
b.remove(0, 3);
assertEquals(0, b.length());
}
public void testInvalidRemove() throws Exception {
ByteArrayBuffer buffer = new ByteArrayBuffer(16);
buffer.setLength(8);
try {
buffer.remove(-1, 0);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.remove(0, -1);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.remove(0, 9);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
try {
buffer.remove(10, 2);
fail("IndexOutOfBoundsException should have been thrown");
} catch (IndexOutOfBoundsException ex) {
// expected
}
}
}