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/*
* Copyright (C) 2012 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.common.hash;
import static com.google.common.base.Charsets.UTF_16LE;
import static org.junit.Assert.assertArrayEquals;
import java.io.ByteArrayOutputStream;
import java.util.Random;
import junit.framework.TestCase;
/**
* Tests for AbstractByteHasher.
*
* @author Colin Decker
*/
public class AbstractByteHasherTest extends TestCase {
public void testBytes() {
TestHasher hasher = new TestHasher(); // byte order insignificant here
byte[] expected = {1, 2, 3, 4, 5, 6, 7, 8};
hasher.putByte((byte) 1);
hasher.putBytes(new byte[] {2, 3, 4, 5, 6});
hasher.putByte((byte) 7);
hasher.putBytes(new byte[] {});
hasher.putBytes(new byte[] {8});
hasher.assertBytes(expected);
}
public void testShort() {
TestHasher hasher = new TestHasher();
hasher.putShort((short) 0x0201);
hasher.assertBytes(new byte[] {1, 2});
}
public void testInt() {
TestHasher hasher = new TestHasher();
hasher.putInt(0x04030201);
hasher.assertBytes(new byte[] {1, 2, 3, 4});
}
public void testLong() {
TestHasher hasher = new TestHasher();
hasher.putLong(0x0807060504030201L);
hasher.assertBytes(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
}
public void testChar() {
TestHasher hasher = new TestHasher();
hasher.putChar((char) 0x0201);
hasher.assertBytes(new byte[] {1, 2});
}
public void testString() {
Random random = new Random();
for (int i = 0; i < 100; i++) {
byte[] bytes = new byte[64];
random.nextBytes(bytes);
String s = new String(bytes, UTF_16LE); // so all random strings are valid
assertEquals(
new TestHasher().putUnencodedChars(s).hash(),
new TestHasher().putBytes(s.getBytes(UTF_16LE)).hash());
assertEquals(
new TestHasher().putUnencodedChars(s).hash(),
new TestHasher().putString(s, UTF_16LE).hash());
}
}
public void testFloat() {
TestHasher hasher = new TestHasher();
hasher.putFloat(Float.intBitsToFloat(0x04030201));
hasher.assertBytes(new byte[] {1, 2, 3, 4});
}
public void testDouble() {
TestHasher hasher = new TestHasher();
hasher.putDouble(Double.longBitsToDouble(0x0807060504030201L));
hasher.assertBytes(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
}
public void testCorrectExceptions() {
TestHasher hasher = new TestHasher();
try {
hasher.putBytes(new byte[8], -1, 4);
fail();
} catch (IndexOutOfBoundsException expected) {
}
try {
hasher.putBytes(new byte[8], 0, 16);
fail();
} catch (IndexOutOfBoundsException expected) {
}
try {
hasher.putBytes(new byte[8], 0, -1);
fail();
} catch (IndexOutOfBoundsException expected) {
}
}
private class TestHasher extends AbstractByteHasher {
private final ByteArrayOutputStream out = new ByteArrayOutputStream();
@Override
protected void update(byte b) {
out.write(b);
}
@Override
protected void update(byte[] b, int off, int len) {
out.write(b, off, len);
}
byte[] bytes() {
return out.toByteArray();
}
void assertBytes(byte[] expected) {
assertArrayEquals(expected, bytes());
}
@Override
public HashCode hash() {
return HashCode.fromBytesNoCopy(bytes());
}
}
}
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