| /* |
| * Copyright (C) 2008 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.primitives; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import com.google.common.annotations.GwtIncompatible; |
| import com.google.common.collect.testing.Helpers; |
| import com.google.common.testing.NullPointerTester; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import junit.framework.TestCase; |
| |
| /** |
| * Unit test for {@link Bytes}. |
| * |
| * @author Kevin Bourrillion |
| */ |
| @GwtCompatible(emulated = true) |
| public class BytesTest extends TestCase { |
| private static final byte[] EMPTY = {}; |
| private static final byte[] ARRAY1 = {(byte) 1}; |
| private static final byte[] ARRAY234 = {(byte) 2, (byte) 3, (byte) 4}; |
| |
| private static final byte[] VALUES = {Byte.MIN_VALUE, -1, 0, 1, Byte.MAX_VALUE}; |
| |
| public void testHashCode() { |
| for (byte value : VALUES) { |
| assertEquals(((Byte) value).hashCode(), Bytes.hashCode(value)); |
| } |
| } |
| |
| public void testContains() { |
| assertFalse(Bytes.contains(EMPTY, (byte) 1)); |
| assertFalse(Bytes.contains(ARRAY1, (byte) 2)); |
| assertFalse(Bytes.contains(ARRAY234, (byte) 1)); |
| assertTrue(Bytes.contains(new byte[] {(byte) -1}, (byte) -1)); |
| assertTrue(Bytes.contains(ARRAY234, (byte) 2)); |
| assertTrue(Bytes.contains(ARRAY234, (byte) 3)); |
| assertTrue(Bytes.contains(ARRAY234, (byte) 4)); |
| } |
| |
| public void testIndexOf() { |
| assertEquals(-1, Bytes.indexOf(EMPTY, (byte) 1)); |
| assertEquals(-1, Bytes.indexOf(ARRAY1, (byte) 2)); |
| assertEquals(-1, Bytes.indexOf(ARRAY234, (byte) 1)); |
| assertEquals(0, Bytes.indexOf(new byte[] {(byte) -1}, (byte) -1)); |
| assertEquals(0, Bytes.indexOf(ARRAY234, (byte) 2)); |
| assertEquals(1, Bytes.indexOf(ARRAY234, (byte) 3)); |
| assertEquals(2, Bytes.indexOf(ARRAY234, (byte) 4)); |
| assertEquals(1, Bytes.indexOf(new byte[] {(byte) 2, (byte) 3, (byte) 2, (byte) 3}, (byte) 3)); |
| } |
| |
| public void testIndexOf_arrayTarget() { |
| assertEquals(0, Bytes.indexOf(EMPTY, EMPTY)); |
| assertEquals(0, Bytes.indexOf(ARRAY234, EMPTY)); |
| assertEquals(-1, Bytes.indexOf(EMPTY, ARRAY234)); |
| assertEquals(-1, Bytes.indexOf(ARRAY234, ARRAY1)); |
| assertEquals(-1, Bytes.indexOf(ARRAY1, ARRAY234)); |
| assertEquals(0, Bytes.indexOf(ARRAY1, ARRAY1)); |
| assertEquals(0, Bytes.indexOf(ARRAY234, ARRAY234)); |
| assertEquals(0, Bytes.indexOf(ARRAY234, new byte[] {(byte) 2, (byte) 3})); |
| assertEquals(1, Bytes.indexOf(ARRAY234, new byte[] {(byte) 3, (byte) 4})); |
| assertEquals(1, Bytes.indexOf(ARRAY234, new byte[] {(byte) 3})); |
| assertEquals(2, Bytes.indexOf(ARRAY234, new byte[] {(byte) 4})); |
| assertEquals( |
| 1, |
| Bytes.indexOf( |
| new byte[] {(byte) 2, (byte) 3, (byte) 3, (byte) 3, (byte) 3}, new byte[] {(byte) 3})); |
| assertEquals( |
| 2, |
| Bytes.indexOf( |
| new byte[] {(byte) 2, (byte) 3, (byte) 2, (byte) 3, (byte) 4, (byte) 2, (byte) 3}, |
| new byte[] {(byte) 2, (byte) 3, (byte) 4})); |
| assertEquals( |
| 1, |
| Bytes.indexOf( |
| new byte[] {(byte) 2, (byte) 2, (byte) 3, (byte) 4, (byte) 2, (byte) 3, (byte) 4}, |
| new byte[] {(byte) 2, (byte) 3, (byte) 4})); |
| assertEquals( |
| -1, |
| Bytes.indexOf( |
| new byte[] {(byte) 4, (byte) 3, (byte) 2}, new byte[] {(byte) 2, (byte) 3, (byte) 4})); |
| } |
| |
| public void testLastIndexOf() { |
| assertEquals(-1, Bytes.lastIndexOf(EMPTY, (byte) 1)); |
| assertEquals(-1, Bytes.lastIndexOf(ARRAY1, (byte) 2)); |
| assertEquals(-1, Bytes.lastIndexOf(ARRAY234, (byte) 1)); |
| assertEquals(0, Bytes.lastIndexOf(new byte[] {(byte) -1}, (byte) -1)); |
| assertEquals(0, Bytes.lastIndexOf(ARRAY234, (byte) 2)); |
| assertEquals(1, Bytes.lastIndexOf(ARRAY234, (byte) 3)); |
| assertEquals(2, Bytes.lastIndexOf(ARRAY234, (byte) 4)); |
| assertEquals( |
| 3, Bytes.lastIndexOf(new byte[] {(byte) 2, (byte) 3, (byte) 2, (byte) 3}, (byte) 3)); |
| } |
| |
| public void testConcat() { |
| assertTrue(Arrays.equals(EMPTY, Bytes.concat())); |
| assertTrue(Arrays.equals(EMPTY, Bytes.concat(EMPTY))); |
| assertTrue(Arrays.equals(EMPTY, Bytes.concat(EMPTY, EMPTY, EMPTY))); |
| assertTrue(Arrays.equals(ARRAY1, Bytes.concat(ARRAY1))); |
| assertNotSame(ARRAY1, Bytes.concat(ARRAY1)); |
| assertTrue(Arrays.equals(ARRAY1, Bytes.concat(EMPTY, ARRAY1, EMPTY))); |
| assertTrue( |
| Arrays.equals( |
| new byte[] {(byte) 1, (byte) 1, (byte) 1}, Bytes.concat(ARRAY1, ARRAY1, ARRAY1))); |
| assertTrue( |
| Arrays.equals( |
| new byte[] {(byte) 1, (byte) 2, (byte) 3, (byte) 4}, Bytes.concat(ARRAY1, ARRAY234))); |
| } |
| |
| public void testEnsureCapacity() { |
| assertSame(EMPTY, Bytes.ensureCapacity(EMPTY, 0, 1)); |
| assertSame(ARRAY1, Bytes.ensureCapacity(ARRAY1, 0, 1)); |
| assertSame(ARRAY1, Bytes.ensureCapacity(ARRAY1, 1, 1)); |
| assertTrue( |
| Arrays.equals( |
| new byte[] {(byte) 1, (byte) 0, (byte) 0}, Bytes.ensureCapacity(ARRAY1, 2, 1))); |
| } |
| |
| public void testEnsureCapacity_fail() { |
| try { |
| Bytes.ensureCapacity(ARRAY1, -1, 1); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| try { |
| // notice that this should even fail when no growth was needed |
| Bytes.ensureCapacity(ARRAY1, 1, -1); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| |
| public void testToArray() { |
| // need explicit type parameter to avoid javac warning!? |
| List<Byte> none = Arrays.<Byte>asList(); |
| assertTrue(Arrays.equals(EMPTY, Bytes.toArray(none))); |
| |
| List<Byte> one = Arrays.asList((byte) 1); |
| assertTrue(Arrays.equals(ARRAY1, Bytes.toArray(one))); |
| |
| byte[] array = {(byte) 0, (byte) 1, (byte) 0x55}; |
| |
| List<Byte> three = Arrays.asList((byte) 0, (byte) 1, (byte) 0x55); |
| assertTrue(Arrays.equals(array, Bytes.toArray(three))); |
| |
| assertTrue(Arrays.equals(array, Bytes.toArray(Bytes.asList(array)))); |
| } |
| |
| public void testToArray_threadSafe() { |
| for (int delta : new int[] {+1, 0, -1}) { |
| for (int i = 0; i < VALUES.length; i++) { |
| List<Byte> list = Bytes.asList(VALUES).subList(0, i); |
| Collection<Byte> misleadingSize = Helpers.misleadingSizeCollection(delta); |
| misleadingSize.addAll(list); |
| byte[] arr = Bytes.toArray(misleadingSize); |
| assertEquals(i, arr.length); |
| for (int j = 0; j < i; j++) { |
| assertEquals(VALUES[j], arr[j]); |
| } |
| } |
| } |
| } |
| |
| public void testToArray_withNull() { |
| List<Byte> list = Arrays.asList((byte) 0, (byte) 1, null); |
| try { |
| Bytes.toArray(list); |
| fail(); |
| } catch (NullPointerException expected) { |
| } |
| } |
| |
| public void testToArray_withConversion() { |
| byte[] array = {(byte) 0, (byte) 1, (byte) 2}; |
| |
| List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2); |
| List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2); |
| List<Integer> ints = Arrays.asList(0, 1, 2); |
| List<Float> floats = Arrays.asList((float) 0, (float) 1, (float) 2); |
| List<Long> longs = Arrays.asList((long) 0, (long) 1, (long) 2); |
| List<Double> doubles = Arrays.asList((double) 0, (double) 1, (double) 2); |
| |
| assertTrue(Arrays.equals(array, Bytes.toArray(bytes))); |
| assertTrue(Arrays.equals(array, Bytes.toArray(shorts))); |
| assertTrue(Arrays.equals(array, Bytes.toArray(ints))); |
| assertTrue(Arrays.equals(array, Bytes.toArray(floats))); |
| assertTrue(Arrays.equals(array, Bytes.toArray(longs))); |
| assertTrue(Arrays.equals(array, Bytes.toArray(doubles))); |
| } |
| |
| public void testAsList_isAView() { |
| byte[] array = {(byte) 0, (byte) 1}; |
| List<Byte> list = Bytes.asList(array); |
| list.set(0, (byte) 2); |
| assertTrue(Arrays.equals(new byte[] {(byte) 2, (byte) 1}, array)); |
| array[1] = (byte) 3; |
| assertEquals(Arrays.asList((byte) 2, (byte) 3), list); |
| } |
| |
| public void testAsList_toArray_roundTrip() { |
| byte[] array = {(byte) 0, (byte) 1, (byte) 2}; |
| List<Byte> list = Bytes.asList(array); |
| byte[] newArray = Bytes.toArray(list); |
| |
| // Make sure it returned a copy |
| list.set(0, (byte) 4); |
| assertTrue(Arrays.equals(new byte[] {(byte) 0, (byte) 1, (byte) 2}, newArray)); |
| newArray[1] = (byte) 5; |
| assertEquals((byte) 1, (byte) list.get(1)); |
| } |
| |
| // This test stems from a real bug found by andrewk |
| public void testAsList_subList_toArray_roundTrip() { |
| byte[] array = {(byte) 0, (byte) 1, (byte) 2, (byte) 3}; |
| List<Byte> list = Bytes.asList(array); |
| assertTrue(Arrays.equals(new byte[] {(byte) 1, (byte) 2}, Bytes.toArray(list.subList(1, 3)))); |
| assertTrue(Arrays.equals(new byte[] {}, Bytes.toArray(list.subList(2, 2)))); |
| } |
| |
| public void testAsListEmpty() { |
| assertSame(Collections.emptyList(), Bytes.asList(EMPTY)); |
| } |
| |
| public void testReverse() { |
| testReverse(new byte[] {}, new byte[] {}); |
| testReverse(new byte[] {1}, new byte[] {1}); |
| testReverse(new byte[] {1, 2}, new byte[] {2, 1}); |
| testReverse(new byte[] {3, 1, 1}, new byte[] {1, 1, 3}); |
| testReverse(new byte[] {-1, 1, -2, 2}, new byte[] {2, -2, 1, -1}); |
| } |
| |
| private static void testReverse(byte[] input, byte[] expectedOutput) { |
| input = Arrays.copyOf(input, input.length); |
| Bytes.reverse(input); |
| assertTrue(Arrays.equals(expectedOutput, input)); |
| } |
| |
| private static void testReverse(byte[] input, int fromIndex, int toIndex, byte[] expectedOutput) { |
| input = Arrays.copyOf(input, input.length); |
| Bytes.reverse(input, fromIndex, toIndex); |
| assertTrue(Arrays.equals(expectedOutput, input)); |
| } |
| |
| public void testReverseIndexed() { |
| testReverse(new byte[] {}, 0, 0, new byte[] {}); |
| testReverse(new byte[] {1}, 0, 1, new byte[] {1}); |
| testReverse(new byte[] {1, 2}, 0, 2, new byte[] {2, 1}); |
| testReverse(new byte[] {3, 1, 1}, 0, 2, new byte[] {1, 3, 1}); |
| testReverse(new byte[] {3, 1, 1}, 0, 1, new byte[] {3, 1, 1}); |
| testReverse(new byte[] {-1, 1, -2, 2}, 1, 3, new byte[] {-1, -2, 1, 2}); |
| } |
| |
| @GwtIncompatible // NullPointerTester |
| public void testNulls() { |
| new NullPointerTester().testAllPublicStaticMethods(Bytes.class); |
| } |
| } |