/*
* Copyright (C) 2007 Google Inc.
*
* 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.collect;
import static com.google.common.testing.junit3.JUnitAsserts.assertContentsInOrder;
import com.google.common.testutils.NullPointerTester;
import junit.framework.TestCase;
import java.io.Serializable;
import java.util.Arrays;
import java.util.List;
/**
* Unit test for {@code ObjectArrays}.
*
* @author Kevin Bourrillion
*/
public class ObjectArraysTest extends TestCase {
public void testNullPointerExceptions() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicStaticMethods(ObjectArrays.class);
}
public void testNewArray_fromClass_Empty() {
String[] empty = ObjectArrays.newArray(String.class, 0);
assertEquals(String[].class, empty.getClass());
assertEquals(0, empty.length);
}
public void testNewArray_fromClass_Nonempty() {
String[] array = ObjectArrays.newArray(String.class, 2);
assertEquals(String[].class, array.getClass());
assertEquals(2, array.length);
assertNull(array[0]);
}
public void testNewArray_fromClass_OfArray() {
String[][] array = ObjectArrays.newArray(String[].class, 1);
assertEquals(String[][].class, array.getClass());
assertEquals(1, array.length);
assertNull(array[0]);
}
public void testNewArray_fromArray_Empty() {
String[] in = new String[0];
String[] empty = ObjectArrays.newArray(in, 0);
assertEquals(0, empty.length);
}
public void testNewArray_fromArray_Nonempty() {
String[] array = ObjectArrays.newArray(new String[0], 2);
assertEquals(String[].class, array.getClass());
assertEquals(2, array.length);
assertNull(array[0]);
}
public void testNewArray_fromArray_OfArray() {
String[][] array = ObjectArrays.newArray(new String[0][0], 1);
assertEquals(String[][].class, array.getClass());
assertEquals(1, array.length);
assertNull(array[0]);
}
public void testConcatEmptyEmpty() {
String[] result
= ObjectArrays.concat(new String[0], new String[0], String.class);
assertEquals(String[].class, result.getClass());
assertEquals(0, result.length);
}
public void testConcatEmptyNonempty() {
String[] result = ObjectArrays.concat(
new String[0], new String[] { "a", "b" }, String.class);
assertEquals(String[].class, result.getClass());
assertContentsInOrder(Arrays.asList(result), "a", "b");
}
public void testConcatNonemptyEmpty() {
String[] result = ObjectArrays.concat(
new String[] { "a", "b" }, new String[0], String.class);
assertEquals(String[].class, result.getClass());
assertContentsInOrder(Arrays.asList(result), "a", "b");
}
public void testConcatBasic() {
String[] result = ObjectArrays.concat(
new String[] { "a", "b" }, new String[] { "c", "d" }, String.class);
assertEquals(String[].class, result.getClass());
assertContentsInOrder(Arrays.asList(result), "a", "b", "c", "d");
}
public void testConcatWithMoreGeneralType() {
Serializable[] result
= ObjectArrays.concat(new String[0], new String[0], Serializable.class);
assertEquals(Serializable[].class, result.getClass());
}
public void testToArrayImpl1() {
doTestToArrayImpl1(Lists.<Integer>newArrayList());
doTestToArrayImpl1(Lists.newArrayList(1));
doTestToArrayImpl1(Lists.newArrayList(1, null, 3));
}
private void doTestToArrayImpl1(List<Integer> list) {
Object[] reference = list.toArray();
Object[] target = ObjectArrays.toArrayImpl(list);
assertEquals(reference.getClass(), target.getClass());
assertTrue(Arrays.equals(reference, target));
}
public void testToArrayImpl2() {
doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[0], false);
doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[1], true);
doTestToArrayImpl2(Lists.newArrayList(1), new Integer[0], false);
doTestToArrayImpl2(Lists.newArrayList(1), new Integer[1], true);
doTestToArrayImpl2(Lists.newArrayList(1), new Integer[] { 2, 3 }, true);
doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[0], false);
doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[2], false);
doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[3], true);
}
private void doTestToArrayImpl2(List<Integer> list, Integer[] array1,
boolean expectModify) {
Integer[] starting = array1.clone();
Integer[] array2 = array1.clone();
Object[] reference = list.toArray(array1);
Object[] target = ObjectArrays.toArrayImpl(list, array2);
assertEquals(reference.getClass(), target.getClass());
assertTrue(Arrays.equals(reference, target));
assertTrue(Arrays.equals(reference, target));
Object[] expectedArray1 = expectModify ? reference : starting;
Object[] expectedArray2 = expectModify ? target : starting;
assertTrue(Arrays.equals(expectedArray1, array1));
assertTrue(Arrays.equals(expectedArray2, array2));
}
public void testPrependZeroElements() {
String[] result = ObjectArrays.concat("foo", new String[] {});
assertContentsInOrder(Arrays.asList(result), "foo");
}
public void testPrependOneElement() {
String[] result = ObjectArrays.concat("foo", new String[]{ "bar" });
assertContentsInOrder(Arrays.asList(result), "foo", "bar");
}
public void testPrependTwoElements() {
String[] result = ObjectArrays.concat("foo", new String[]{ "bar", "baz" });
assertContentsInOrder(Arrays.asList(result), "foo", "bar", "baz");
}
public void testAppendZeroElements() {
String[] result = ObjectArrays.concat(new String[] {}, "foo");
assertContentsInOrder(Arrays.asList(result), "foo");
}
public void testAppendOneElement() {
String[] result = ObjectArrays.concat(new String[]{ "foo" }, "bar");
assertContentsInOrder(Arrays.asList(result), "foo", "bar");
}
public void testAppendTwoElements() {
String[] result = ObjectArrays.concat(new String[]{ "foo", "bar" }, "baz");
assertContentsInOrder(Arrays.asList(result), "foo", "bar", "baz");
}
}