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      1 /*
      2  * Copyright (C) 2007 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect;
     18 
     19 import static org.junit.contrib.truth.Truth.ASSERT;
     20 
     21 import com.google.common.annotations.GwtCompatible;
     22 import com.google.common.annotations.GwtIncompatible;
     23 import com.google.common.testing.NullPointerTester;
     24 
     25 import junit.framework.TestCase;
     26 
     27 import java.io.Serializable;
     28 import java.util.Arrays;
     29 import java.util.List;
     30 
     31 /**
     32  * Unit test for {@code ObjectArrays}.
     33  *
     34  * @author Kevin Bourrillion
     35  */
     36 @GwtCompatible(emulated = true)
     37 public class ObjectArraysTest extends TestCase {
     38 
     39   @GwtIncompatible("NullPointerTester")
     40   public void testNullPointerExceptions() throws Exception {
     41     NullPointerTester tester = new NullPointerTester();
     42     tester.testAllPublicStaticMethods(ObjectArrays.class);
     43   }
     44 
     45   @GwtIncompatible("ObjectArrays.newArray(Class, int)")
     46   public void testNewArray_fromClass_Empty() {
     47     String[] empty = ObjectArrays.newArray(String.class, 0);
     48     assertEquals(String[].class, empty.getClass());
     49     assertEquals(0, empty.length);
     50   }
     51 
     52   @GwtIncompatible("ObjectArrays.newArray(Class, int)")
     53   public void testNewArray_fromClass_Nonempty() {
     54     String[] array = ObjectArrays.newArray(String.class, 2);
     55     assertEquals(String[].class, array.getClass());
     56     assertEquals(2, array.length);
     57     assertNull(array[0]);
     58   }
     59 
     60   @GwtIncompatible("ObjectArrays.newArray(Class, int)")
     61   public void testNewArray_fromClass_OfArray() {
     62     String[][] array = ObjectArrays.newArray(String[].class, 1);
     63     assertEquals(String[][].class, array.getClass());
     64     assertEquals(1, array.length);
     65     assertNull(array[0]);
     66   }
     67 
     68   public void testNewArray_fromArray_Empty() {
     69     String[] in = new String[0];
     70     String[] empty = ObjectArrays.newArray(in, 0);
     71     assertEquals(0, empty.length);
     72   }
     73 
     74   public void testNewArray_fromArray_Nonempty() {
     75     String[] array = ObjectArrays.newArray(new String[0], 2);
     76     assertEquals(String[].class, array.getClass());
     77     assertEquals(2, array.length);
     78     assertNull(array[0]);
     79   }
     80 
     81   public void testNewArray_fromArray_OfArray() {
     82     String[][] array = ObjectArrays.newArray(new String[0][0], 1);
     83     assertEquals(String[][].class, array.getClass());
     84     assertEquals(1, array.length);
     85     assertNull(array[0]);
     86   }
     87 
     88   @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
     89   public void testConcatEmptyEmpty() {
     90     String[] result
     91         = ObjectArrays.concat(new String[0], new String[0], String.class);
     92     assertEquals(String[].class, result.getClass());
     93     assertEquals(0, result.length);
     94   }
     95 
     96   @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
     97   public void testConcatEmptyNonempty() {
     98     String[] result = ObjectArrays.concat(
     99         new String[0], new String[] { "a", "b" }, String.class);
    100     assertEquals(String[].class, result.getClass());
    101     ASSERT.that(result).hasContentsInOrder("a", "b");
    102   }
    103 
    104   @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
    105   public void testConcatNonemptyEmpty() {
    106     String[] result = ObjectArrays.concat(
    107         new String[] { "a", "b" }, new String[0], String.class);
    108     assertEquals(String[].class, result.getClass());
    109     ASSERT.that(result).hasContentsInOrder("a", "b");
    110   }
    111 
    112   @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
    113   public void testConcatBasic() {
    114     String[] result = ObjectArrays.concat(
    115         new String[] { "a", "b" }, new String[] { "c", "d" }, String.class);
    116     assertEquals(String[].class, result.getClass());
    117     ASSERT.that(result).hasContentsInOrder("a", "b", "c", "d");
    118   }
    119 
    120   @GwtIncompatible("ObjectArrays.concat(Object[], Object[], Class)")
    121   public void testConcatWithMoreGeneralType() {
    122     Serializable[] result
    123         = ObjectArrays.concat(new String[0], new String[0], Serializable.class);
    124     assertEquals(Serializable[].class, result.getClass());
    125   }
    126 
    127   public void testToArrayImpl1() {
    128     doTestToArrayImpl1(Lists.<Integer>newArrayList());
    129     doTestToArrayImpl1(Lists.newArrayList(1));
    130     doTestToArrayImpl1(Lists.newArrayList(1, null, 3));
    131   }
    132 
    133   private void doTestToArrayImpl1(List<Integer> list) {
    134     Object[] reference = list.toArray();
    135     Object[] target = ObjectArrays.toArrayImpl(list);
    136     assertEquals(reference.getClass(), target.getClass());
    137     assertTrue(Arrays.equals(reference, target));
    138   }
    139 
    140   public void testToArrayImpl2() {
    141     doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[0], false);
    142     doTestToArrayImpl2(Lists.<Integer>newArrayList(), new Integer[1], true);
    143 
    144     doTestToArrayImpl2(Lists.newArrayList(1), new Integer[0], false);
    145     doTestToArrayImpl2(Lists.newArrayList(1), new Integer[1], true);
    146     doTestToArrayImpl2(Lists.newArrayList(1), new Integer[] { 2, 3 }, true);
    147 
    148     doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[0], false);
    149     doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[2], false);
    150     doTestToArrayImpl2(Lists.newArrayList(1, null, 3), new Integer[3], true);
    151   }
    152 
    153   private void doTestToArrayImpl2(List<Integer> list, Integer[] array1,
    154       boolean expectModify) {
    155     Integer[] starting = Platform.clone(array1);
    156     Integer[] array2 = Platform.clone(array1);
    157     Object[] reference = list.toArray(array1);
    158 
    159     Object[] target = ObjectArrays.toArrayImpl(list, array2);
    160 
    161     assertEquals(reference.getClass(), target.getClass());
    162     assertTrue(Arrays.equals(reference, target));
    163     assertTrue(Arrays.equals(reference, target));
    164 
    165     Object[] expectedArray1 = expectModify ? reference : starting;
    166     Object[] expectedArray2 = expectModify ? target : starting;
    167     assertTrue(Arrays.equals(expectedArray1, array1));
    168     assertTrue(Arrays.equals(expectedArray2, array2));
    169   }
    170 
    171   public void testPrependZeroElements() {
    172     String[] result = ObjectArrays.concat("foo", new String[] {});
    173     ASSERT.that(result).hasContentsInOrder("foo");
    174   }
    175 
    176   public void testPrependOneElement() {
    177     String[] result = ObjectArrays.concat("foo", new String[]{ "bar" });
    178     ASSERT.that(result).hasContentsInOrder("foo", "bar");
    179   }
    180 
    181   public void testPrependTwoElements() {
    182     String[] result = ObjectArrays.concat("foo", new String[]{ "bar", "baz" });
    183     ASSERT.that(result).hasContentsInOrder("foo", "bar", "baz");
    184   }
    185 
    186   public void testAppendZeroElements() {
    187     String[] result = ObjectArrays.concat(new String[] {}, "foo");
    188     ASSERT.that(result).hasContentsInOrder("foo");
    189   }
    190 
    191   public void testAppendOneElement() {
    192     String[] result = ObjectArrays.concat(new String[]{ "foo" }, "bar");
    193     ASSERT.that(result).hasContentsInOrder("foo", "bar");
    194   }
    195 
    196   public void testAppendTwoElements() {
    197     String[] result = ObjectArrays.concat(new String[]{ "foo", "bar" }, "baz");
    198     ASSERT.that(result).hasContentsInOrder("foo", "bar", "baz");
    199   }
    200 }
    201