| /* |
| * 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 static com.google.common.truth.Truth.assertThat; |
| import static java.lang.Double.NaN; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import com.google.common.base.Converter; |
| import com.google.common.collect.testing.Helpers; |
| |
| import junit.framework.TestCase; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| /** |
| * Unit test for {@link Doubles}. |
| * |
| * @author Kevin Bourrillion |
| */ |
| @GwtCompatible(emulated = true) |
| @SuppressWarnings("cast") // redundant casts are intentional and harmless |
| public class DoublesTest extends TestCase { |
| private static final double[] EMPTY = {}; |
| private static final double[] ARRAY1 = {(double) 1}; |
| private static final double[] ARRAY234 |
| = {(double) 2, (double) 3, (double) 4}; |
| |
| private static final double LEAST = Double.NEGATIVE_INFINITY; |
| private static final double GREATEST = Double.POSITIVE_INFINITY; |
| |
| private static final double[] NUMBERS = new double[] { |
| LEAST, -Double.MAX_VALUE, -1.0, -0.5, -0.1, -0.0, 0.0, 0.1, 0.5, 1.0, |
| Double.MAX_VALUE, GREATEST, Double.MIN_NORMAL, -Double.MIN_NORMAL, |
| Double.MIN_VALUE, -Double.MIN_VALUE, Integer.MIN_VALUE, |
| Integer.MAX_VALUE, Long.MIN_VALUE, Long.MAX_VALUE |
| }; |
| |
| private static final double[] VALUES |
| = Doubles.concat(NUMBERS, new double[] {NaN}); |
| |
| public void testHashCode() { |
| for (double value : VALUES) { |
| assertEquals(((Double) value).hashCode(), Doubles.hashCode(value)); |
| } |
| } |
| |
| public void testIsFinite() { |
| for (double value : NUMBERS) { |
| assertEquals(!(Double.isNaN(value) || Double.isInfinite(value)), Doubles.isFinite(value)); |
| } |
| } |
| |
| public void testCompare() { |
| for (double x : VALUES) { |
| for (double y : VALUES) { |
| // note: spec requires only that the sign is the same |
| assertEquals(x + ", " + y, |
| Double.valueOf(x).compareTo(y), |
| Doubles.compare(x, y)); |
| } |
| } |
| } |
| |
| public void testContains() { |
| assertFalse(Doubles.contains(EMPTY, (double) 1)); |
| assertFalse(Doubles.contains(ARRAY1, (double) 2)); |
| assertFalse(Doubles.contains(ARRAY234, (double) 1)); |
| assertTrue(Doubles.contains(new double[] {(double) -1}, (double) -1)); |
| assertTrue(Doubles.contains(ARRAY234, (double) 2)); |
| assertTrue(Doubles.contains(ARRAY234, (double) 3)); |
| assertTrue(Doubles.contains(ARRAY234, (double) 4)); |
| |
| for (double value : NUMBERS) { |
| assertTrue("" + value, |
| Doubles.contains(new double[] {5.0, value}, value)); |
| } |
| assertFalse(Doubles.contains(new double[] {5.0, NaN}, NaN)); |
| } |
| |
| public void testIndexOf() { |
| assertEquals(-1, Doubles.indexOf(EMPTY, (double) 1)); |
| assertEquals(-1, Doubles.indexOf(ARRAY1, (double) 2)); |
| assertEquals(-1, Doubles.indexOf(ARRAY234, (double) 1)); |
| assertEquals(0, Doubles.indexOf( |
| new double[] {(double) -1}, (double) -1)); |
| assertEquals(0, Doubles.indexOf(ARRAY234, (double) 2)); |
| assertEquals(1, Doubles.indexOf(ARRAY234, (double) 3)); |
| assertEquals(2, Doubles.indexOf(ARRAY234, (double) 4)); |
| assertEquals(1, Doubles.indexOf( |
| new double[] { (double) 2, (double) 3, (double) 2, (double) 3 }, |
| (double) 3)); |
| |
| for (double value : NUMBERS) { |
| assertEquals("" + value, |
| 1, Doubles.indexOf(new double[] {5.0, value}, value)); |
| } |
| assertEquals(-1, Doubles.indexOf(new double[] {5.0, NaN}, NaN)); |
| } |
| |
| public void testIndexOf_arrayTarget() { |
| assertEquals(0, Doubles.indexOf(EMPTY, EMPTY)); |
| assertEquals(0, Doubles.indexOf(ARRAY234, EMPTY)); |
| assertEquals(-1, Doubles.indexOf(EMPTY, ARRAY234)); |
| assertEquals(-1, Doubles.indexOf(ARRAY234, ARRAY1)); |
| assertEquals(-1, Doubles.indexOf(ARRAY1, ARRAY234)); |
| assertEquals(0, Doubles.indexOf(ARRAY1, ARRAY1)); |
| assertEquals(0, Doubles.indexOf(ARRAY234, ARRAY234)); |
| assertEquals(0, Doubles.indexOf( |
| ARRAY234, new double[] { (double) 2, (double) 3 })); |
| assertEquals(1, Doubles.indexOf( |
| ARRAY234, new double[] { (double) 3, (double) 4 })); |
| assertEquals(1, Doubles.indexOf(ARRAY234, new double[] { (double) 3 })); |
| assertEquals(2, Doubles.indexOf(ARRAY234, new double[] { (double) 4 })); |
| assertEquals(1, Doubles.indexOf(new double[] { (double) 2, (double) 3, |
| (double) 3, (double) 3, (double) 3 }, |
| new double[] { (double) 3 } |
| )); |
| assertEquals(2, Doubles.indexOf( |
| new double[] { (double) 2, (double) 3, (double) 2, |
| (double) 3, (double) 4, (double) 2, (double) 3}, |
| new double[] { (double) 2, (double) 3, (double) 4} |
| )); |
| assertEquals(1, Doubles.indexOf( |
| new double[] { (double) 2, (double) 2, (double) 3, |
| (double) 4, (double) 2, (double) 3, (double) 4}, |
| new double[] { (double) 2, (double) 3, (double) 4} |
| )); |
| assertEquals(-1, Doubles.indexOf( |
| new double[] { (double) 4, (double) 3, (double) 2}, |
| new double[] { (double) 2, (double) 3, (double) 4} |
| )); |
| |
| for (double value : NUMBERS) { |
| assertEquals("" + value, 1, Doubles.indexOf( |
| new double[] {5.0, value, value, 5.0}, new double[] {value, value})); |
| } |
| assertEquals(-1, Doubles.indexOf( |
| new double[] {5.0, NaN, NaN, 5.0}, new double[] {NaN, NaN})); |
| } |
| |
| public void testLastIndexOf() { |
| assertEquals(-1, Doubles.lastIndexOf(EMPTY, (double) 1)); |
| assertEquals(-1, Doubles.lastIndexOf(ARRAY1, (double) 2)); |
| assertEquals(-1, Doubles.lastIndexOf(ARRAY234, (double) 1)); |
| assertEquals(0, Doubles.lastIndexOf( |
| new double[] {(double) -1}, (double) -1)); |
| assertEquals(0, Doubles.lastIndexOf(ARRAY234, (double) 2)); |
| assertEquals(1, Doubles.lastIndexOf(ARRAY234, (double) 3)); |
| assertEquals(2, Doubles.lastIndexOf(ARRAY234, (double) 4)); |
| assertEquals(3, Doubles.lastIndexOf( |
| new double[] { (double) 2, (double) 3, (double) 2, (double) 3 }, |
| (double) 3)); |
| |
| for (double value : NUMBERS) { |
| assertEquals("" + value, |
| 0, Doubles.lastIndexOf(new double[] {value, 5.0}, value)); |
| } |
| assertEquals(-1, Doubles.lastIndexOf(new double[] {NaN, 5.0}, NaN)); |
| } |
| |
| public void testMax_noArgs() { |
| try { |
| Doubles.max(); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| |
| public void testMax() { |
| assertEquals(LEAST, Doubles.max(LEAST)); |
| assertEquals(GREATEST, Doubles.max(GREATEST)); |
| assertEquals((double) 9, Doubles.max( |
| (double) 8, (double) 6, (double) 7, |
| (double) 5, (double) 3, (double) 0, (double) 9)); |
| |
| assertEquals(0.0, Doubles.max(-0.0, 0.0)); |
| assertEquals(0.0, Doubles.max(0.0, -0.0)); |
| assertEquals(GREATEST, Doubles.max(NUMBERS)); |
| assertTrue(Double.isNaN(Doubles.max(VALUES))); |
| } |
| |
| public void testMin_noArgs() { |
| try { |
| Doubles.min(); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| |
| public void testMin() { |
| assertEquals(LEAST, Doubles.min(LEAST)); |
| assertEquals(GREATEST, Doubles.min(GREATEST)); |
| assertEquals((double) 0, Doubles.min( |
| (double) 8, (double) 6, (double) 7, |
| (double) 5, (double) 3, (double) 0, (double) 9)); |
| |
| assertEquals(-0.0, Doubles.min(-0.0, 0.0)); |
| assertEquals(-0.0, Doubles.min(0.0, -0.0)); |
| assertEquals(LEAST, Doubles.min(NUMBERS)); |
| assertTrue(Double.isNaN(Doubles.min(VALUES))); |
| } |
| |
| public void testConcat() { |
| assertTrue(Arrays.equals(EMPTY, Doubles.concat())); |
| assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY))); |
| assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY, EMPTY, EMPTY))); |
| assertTrue(Arrays.equals(ARRAY1, Doubles.concat(ARRAY1))); |
| assertNotSame(ARRAY1, Doubles.concat(ARRAY1)); |
| assertTrue(Arrays.equals(ARRAY1, Doubles.concat(EMPTY, ARRAY1, EMPTY))); |
| assertTrue(Arrays.equals( |
| new double[] {(double) 1, (double) 1, (double) 1}, |
| Doubles.concat(ARRAY1, ARRAY1, ARRAY1))); |
| assertTrue(Arrays.equals( |
| new double[] {(double) 1, (double) 2, (double) 3, (double) 4}, |
| Doubles.concat(ARRAY1, ARRAY234))); |
| } |
| |
| public void testEnsureCapacity() { |
| assertSame(EMPTY, Doubles.ensureCapacity(EMPTY, 0, 1)); |
| assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 0, 1)); |
| assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 1, 1)); |
| assertTrue(Arrays.equals( |
| new double[] {(double) 1, (double) 0, (double) 0}, |
| Doubles.ensureCapacity(ARRAY1, 2, 1))); |
| } |
| |
| public void testEnsureCapacity_fail() { |
| try { |
| Doubles.ensureCapacity(ARRAY1, -1, 1); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| try { |
| // notice that this should even fail when no growth was needed |
| Doubles.ensureCapacity(ARRAY1, 1, -1); |
| fail(); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| |
| public void testJoinNonTrivialDoubles() { |
| assertEquals("", Doubles.join(",", EMPTY)); |
| assertEquals("1.2", Doubles.join(",", 1.2)); |
| assertEquals("1.3,2.4", Doubles.join(",", 1.3, 2.4)); |
| assertEquals("1.42.53.6", Doubles.join("", 1.4, 2.5, 3.6)); |
| } |
| |
| public void testLexicographicalComparator() { |
| List<double[]> ordered = Arrays.asList( |
| new double[] {}, |
| new double[] {LEAST}, |
| new double[] {LEAST, LEAST}, |
| new double[] {LEAST, (double) 1}, |
| new double[] {(double) 1}, |
| new double[] {(double) 1, LEAST}, |
| new double[] {GREATEST, Double.MAX_VALUE}, |
| new double[] {GREATEST, GREATEST}, |
| new double[] {GREATEST, GREATEST, GREATEST}); |
| |
| Comparator<double[]> comparator = Doubles.lexicographicalComparator(); |
| Helpers.testComparator(comparator, ordered); |
| } |
| |
| public void testToArray() { |
| // need explicit type parameter to avoid javac warning!? |
| List<Double> none = Arrays.<Double>asList(); |
| assertTrue(Arrays.equals(EMPTY, Doubles.toArray(none))); |
| |
| List<Double> one = Arrays.asList((double) 1); |
| assertTrue(Arrays.equals(ARRAY1, Doubles.toArray(one))); |
| |
| double[] array = {(double) 0, (double) 1, Math.PI}; |
| |
| List<Double> three = Arrays.asList((double) 0, (double) 1, Math.PI); |
| assertTrue(Arrays.equals(array, Doubles.toArray(three))); |
| |
| assertTrue(Arrays.equals(array, Doubles.toArray(Doubles.asList(array)))); |
| } |
| |
| public void testToArray_threadSafe() { |
| for (int delta : new int[] { +1, 0, -1 }) { |
| for (int i = 0; i < VALUES.length; i++) { |
| List<Double> list = Doubles.asList(VALUES).subList(0, i); |
| Collection<Double> misleadingSize = |
| Helpers.misleadingSizeCollection(delta); |
| misleadingSize.addAll(list); |
| double[] arr = Doubles.toArray(misleadingSize); |
| assertEquals(i, arr.length); |
| for (int j = 0; j < i; j++) { |
| assertEquals(VALUES[j], arr[j]); |
| } |
| } |
| } |
| } |
| |
| public void testToArray_withNull() { |
| List<Double> list = Arrays.asList((double) 0, (double) 1, null); |
| try { |
| Doubles.toArray(list); |
| fail(); |
| } catch (NullPointerException expected) { |
| } |
| } |
| |
| public void testToArray_withConversion() { |
| double[] array = {(double) 0, (double) 1, (double) 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, Doubles.toArray(bytes))); |
| assertTrue(Arrays.equals(array, Doubles.toArray(shorts))); |
| assertTrue(Arrays.equals(array, Doubles.toArray(ints))); |
| assertTrue(Arrays.equals(array, Doubles.toArray(floats))); |
| assertTrue(Arrays.equals(array, Doubles.toArray(longs))); |
| assertTrue(Arrays.equals(array, Doubles.toArray(doubles))); |
| } |
| |
| public void testAsList_isAView() { |
| double[] array = {(double) 0, (double) 1}; |
| List<Double> list = Doubles.asList(array); |
| list.set(0, (double) 2); |
| assertTrue(Arrays.equals(new double[] {(double) 2, (double) 1}, array)); |
| array[1] = (double) 3; |
| assertThat(list).containsExactly((double) 2, (double) 3).inOrder(); |
| } |
| |
| public void testAsList_toArray_roundTrip() { |
| double[] array = { (double) 0, (double) 1, (double) 2 }; |
| List<Double> list = Doubles.asList(array); |
| double[] newArray = Doubles.toArray(list); |
| |
| // Make sure it returned a copy |
| list.set(0, (double) 4); |
| assertTrue(Arrays.equals( |
| new double[] { (double) 0, (double) 1, (double) 2 }, newArray)); |
| newArray[1] = (double) 5; |
| assertEquals((double) 1, (double) list.get(1)); |
| } |
| |
| // This test stems from a real bug found by andrewk |
| public void testAsList_subList_toArray_roundTrip() { |
| double[] array = { (double) 0, (double) 1, (double) 2, (double) 3 }; |
| List<Double> list = Doubles.asList(array); |
| assertTrue(Arrays.equals(new double[] { (double) 1, (double) 2 }, |
| Doubles.toArray(list.subList(1, 3)))); |
| assertTrue(Arrays.equals(new double[] {}, |
| Doubles.toArray(list.subList(2, 2)))); |
| } |
| |
| public void testAsListEmpty() { |
| assertSame(Collections.emptyList(), Doubles.asList(EMPTY)); |
| } |
| |
| /** |
| * A reference implementation for {@code tryParse} that just catches the exception from |
| * {@link Double#valueOf}. |
| */ |
| private static Double referenceTryParse(String input) { |
| if (input.trim().length() < input.length()) { |
| return null; |
| } |
| try { |
| return Double.valueOf(input); |
| } catch (NumberFormatException e) { |
| return null; |
| } |
| } |
| |
| private static final String[] BAD_TRY_PARSE_INPUTS = |
| { "", "+-", "+-0", " 5", "32 ", " 55 ", "infinity", "POSITIVE_INFINITY", "0x9A", "0x9A.bE-5", |
| ".", ".e5", "NaNd", "InfinityF" }; |
| |
| public void testStringConverter_convert() { |
| Converter<String, Double> converter = Doubles.stringConverter(); |
| assertEquals((Double) 1.0, converter.convert("1.0")); |
| assertEquals((Double) 0.0, converter.convert("0.0")); |
| assertEquals((Double) (-1.0), converter.convert("-1.0")); |
| assertEquals((Double) 1.0, converter.convert("1")); |
| assertEquals((Double) 0.0, converter.convert("0")); |
| assertEquals((Double) (-1.0), converter.convert("-1")); |
| assertEquals((Double) 1e6, converter.convert("1e6")); |
| assertEquals((Double) 1e-6, converter.convert("1e-6")); |
| } |
| |
| public void testStringConverter_convertError() { |
| try { |
| Doubles.stringConverter().convert("notanumber"); |
| fail(); |
| } catch (NumberFormatException expected) { |
| } |
| } |
| |
| public void testStringConverter_nullConversions() { |
| assertNull(Doubles.stringConverter().convert(null)); |
| assertNull(Doubles.stringConverter().reverse().convert(null)); |
| } |
| } |
| |