guava-tests/test/com/google/common/primitives/UnsignedBytesTest.java - platform/external/guava - Git at Google

 /*
  * 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.collect.testing.Helpers;
 import com.google.common.testing.NullPointerTester;
 import com.google.common.testing.SerializableTester;

 import junit.framework.TestCase;

 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.List;

 /**
  * Unit test for {@link UnsignedBytes}.
  *
  * @author Kevin Bourrillion
  * @author Louis Wasserman
  */
 public class UnsignedBytesTest extends TestCase {
   private static final byte LEAST = 0;
   private static final byte GREATEST = (byte) 255;

   // Only in this class, VALUES must be strictly ascending
   private static final byte[] VALUES =
       {LEAST, 127, (byte) 128, (byte) 129, GREATEST};

   public void testToInt() {
     assertEquals(0, UnsignedBytes.toInt((byte) 0));
     assertEquals(1, UnsignedBytes.toInt((byte) 1));
     assertEquals(127, UnsignedBytes.toInt((byte) 127));
     assertEquals(128, UnsignedBytes.toInt((byte) -128));
     assertEquals(129, UnsignedBytes.toInt((byte) -127));
     assertEquals(255, UnsignedBytes.toInt((byte) -1));
   }

   public void testCheckedCast() {
     for (byte value : VALUES) {
       assertEquals(value,
           UnsignedBytes.checkedCast(UnsignedBytes.toInt(value)));
     }
     assertCastFails(256L);
     assertCastFails(-1L);
     assertCastFails(Long.MAX_VALUE);
     assertCastFails(Long.MIN_VALUE);
   }

   public void testSaturatedCast() {
     for (byte value : VALUES) {
       assertEquals(value,
           UnsignedBytes.saturatedCast(UnsignedBytes.toInt(value)));
     }
     assertEquals(GREATEST, UnsignedBytes.saturatedCast(256L));
     assertEquals(LEAST, UnsignedBytes.saturatedCast(-1L));
     assertEquals(GREATEST, UnsignedBytes.saturatedCast(Long.MAX_VALUE));
     assertEquals(LEAST, UnsignedBytes.saturatedCast(Long.MIN_VALUE));
   }

   private static void assertCastFails(long value) {
     try {
       UnsignedBytes.checkedCast(value);
       fail("Cast to byte should have failed: " + value);
     } catch (IllegalArgumentException ex) {
       assertTrue(value + " not found in exception text: " + ex.getMessage(),
           ex.getMessage().contains(String.valueOf(value)));
     }
   }

   public void testCompare() {
     // This is the only ordering for primitives that does not have a
     // corresponding Comparable wrapper in java.lang.
     for (int i = 0; i < VALUES.length; i++) {
       for (int j = 0; j < VALUES.length; j++) {
         byte x = VALUES[i];
         byte y = VALUES[j];
         // note: spec requires only that the sign is the same
         assertEquals(x + ", " + y,
                      Math.signum(UnsignedBytes.compare(x, y)),
                      Math.signum(Ints.compare(i, j)));
       }
     }
   }

   public void testMax_noArgs() {
     try {
       UnsignedBytes.max();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testMax() {
     assertEquals(LEAST, UnsignedBytes.max(LEAST));
     assertEquals(GREATEST, UnsignedBytes.max(GREATEST));
     assertEquals((byte) 255, UnsignedBytes.max(
         (byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
   }

   public void testMin_noArgs() {
     try {
       UnsignedBytes.min();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }

   public void testMin() {
     assertEquals(LEAST, UnsignedBytes.min(LEAST));
     assertEquals(GREATEST, UnsignedBytes.min(GREATEST));
     assertEquals((byte) 0, UnsignedBytes.min(
         (byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
     assertEquals((byte) 0, UnsignedBytes.min(
         (byte) -1, (byte) 127, (byte) 1, (byte) -128, (byte) 0));
   }

   private static void assertParseFails(String value) {
     try {
       UnsignedBytes.parseUnsignedByte(value);
       fail();
     } catch (NumberFormatException expected) {
     }
   }

   public void testParseUnsignedByte() {
     // We can easily afford to test this exhaustively.
     for (int i = 0; i <= 0xff; i++) {
       assertEquals((byte) i, UnsignedBytes.parseUnsignedByte(Integer.toString(i)));
     }
     assertParseFails("1000");
     assertParseFails("-1");
     assertParseFails("-128");
     assertParseFails("256");
   }

   public void testMaxValue() {
     assertTrue(UnsignedBytes
         .compare(UnsignedBytes.MAX_VALUE, (byte) (UnsignedBytes.MAX_VALUE + 1)) > 0);
   }

   private static void assertParseFails(String value, int radix) {
     try {
       UnsignedBytes.parseUnsignedByte(value, radix);
       fail();
     } catch (NumberFormatException expected) {
     }
   }

   public void testParseUnsignedByteWithRadix() throws NumberFormatException {
     // We can easily afford to test this exhaustively.
     for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
       for (int i = 0; i <= 0xff; i++) {
         assertEquals((byte) i, UnsignedBytes.parseUnsignedByte(Integer.toString(i, radix), radix));
       }
       assertParseFails(Integer.toString(1000, radix), radix);
       assertParseFails(Integer.toString(-1, radix), radix);
       assertParseFails(Integer.toString(-128, radix), radix);
       assertParseFails(Integer.toString(256, radix), radix);
     }
   }

   public void testParseUnsignedByteThrowsExceptionForInvalidRadix() {
     // Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX,
     // inclusive.
     try {
       UnsignedBytes.parseUnsignedByte("0", Character.MIN_RADIX - 1);
       fail();
     } catch (NumberFormatException nfe) {
       // expected
     }

     try {
       UnsignedBytes.parseUnsignedByte("0", Character.MAX_RADIX + 1);
       fail();
     } catch (NumberFormatException nfe) {
       // expected
     }

     // The radix is used as an array index, so try a negative value.
     try {
       UnsignedBytes.parseUnsignedByte("0", -1);
       fail();
     } catch (NumberFormatException nfe) {
       // expected
     }
   }

   public void testToString() {
     // We can easily afford to test this exhaustively.
     for (int i = 0; i <= 0xff; i++) {
       assertEquals(Integer.toString(i), UnsignedBytes.toString((byte) i));
     }
   }

   public void testToStringWithRadix() {
     // We can easily afford to test this exhaustively.
     for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
       for (int i = 0; i <= 0xff; i++) {
         assertEquals(Integer.toString(i, radix), UnsignedBytes.toString((byte) i, radix));
       }
     }
   }

   public void testJoin() {
     assertEquals("", UnsignedBytes.join(",", new byte[] {}));
     assertEquals("1", UnsignedBytes.join(",", new byte[] {(byte) 1}));
     assertEquals("1,2", UnsignedBytes.join(",", (byte) 1, (byte) 2));
     assertEquals("123", UnsignedBytes.join("", (byte) 1, (byte) 2, (byte) 3));
     assertEquals("128,255", UnsignedBytes.join(",", (byte) 128, (byte) -1));
   }

   public void testLexicographicalComparatorDefaultChoice() {
     Comparator<byte[]> defaultComparator =
         UnsignedBytes.lexicographicalComparator();
     Comparator<byte[]> pureJavaComparator =
         UnsignedBytes.LexicographicalComparatorHolder.PureJavaComparator.INSTANCE;
     assertSame(defaultComparator, pureJavaComparator);
   }

   public void testLexicographicalComparator() {
     List<byte[]> ordered = Arrays.asList(
         new byte[] {},
         new byte[] {LEAST},
         new byte[] {LEAST, LEAST},
         new byte[] {LEAST, (byte) 1},
         new byte[] {(byte) 1},
         new byte[] {(byte) 1, LEAST},
         new byte[] {GREATEST, GREATEST - (byte) 1},
         new byte[] {GREATEST, GREATEST},
         new byte[] {GREATEST, GREATEST, GREATEST});

     // The Unsafe implementation if it's available. Otherwise, the Java implementation.
     Comparator<byte[]> comparator = UnsignedBytes.lexicographicalComparator();
     Helpers.testComparator(comparator, ordered);
     assertSame(comparator, SerializableTester.reserialize(comparator));

     // The Java implementation.
     Comparator<byte[]> javaImpl = UnsignedBytes.lexicographicalComparatorJavaImpl();
     Helpers.testComparator(javaImpl, ordered);
     assertSame(javaImpl, SerializableTester.reserialize(javaImpl));
   }

   @SuppressWarnings("unchecked")
   public void testLexicographicalComparatorLongInputs() {
     for (Comparator<byte[]> comparator : Arrays.asList(
         UnsignedBytes.lexicographicalComparator(),
         UnsignedBytes.lexicographicalComparatorJavaImpl())) {
       for (int i = 0; i < 32; i++) {
         byte[] left = new byte[32];
         byte[] right = new byte[32];

         assertTrue(comparator.compare(left, right) == 0);
         left[i] = 1;
         assertTrue(comparator.compare(left, right) > 0);
         assertTrue(comparator.compare(right, left) < 0);
       }
     }
   }

   public void testNulls() {
     new NullPointerTester().testAllPublicStaticMethods(UnsignedBytes.class);
   }
 }
	/*
	* 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.collect.testing.Helpers;
	import com.google.common.testing.NullPointerTester;
	import com.google.common.testing.SerializableTester;

	import junit.framework.TestCase;

	import java.util.Arrays;
	import java.util.Comparator;
	import java.util.List;

	/**
	* Unit test for {@link UnsignedBytes}.
	*
	* @author Kevin Bourrillion
	* @author Louis Wasserman
	*/
	public class UnsignedBytesTest extends TestCase {
	private static final byte LEAST = 0;
	private static final byte GREATEST = (byte) 255;

	// Only in this class, VALUES must be strictly ascending
	private static final byte[] VALUES =
	{LEAST, 127, (byte) 128, (byte) 129, GREATEST};

	public void testToInt() {
	assertEquals(0, UnsignedBytes.toInt((byte) 0));
	assertEquals(1, UnsignedBytes.toInt((byte) 1));
	assertEquals(127, UnsignedBytes.toInt((byte) 127));
	assertEquals(128, UnsignedBytes.toInt((byte) -128));
	assertEquals(129, UnsignedBytes.toInt((byte) -127));
	assertEquals(255, UnsignedBytes.toInt((byte) -1));
	}

	public void testCheckedCast() {
	for (byte value : VALUES) {
	assertEquals(value,
	UnsignedBytes.checkedCast(UnsignedBytes.toInt(value)));
	}
	assertCastFails(256L);
	assertCastFails(-1L);
	assertCastFails(Long.MAX_VALUE);
	assertCastFails(Long.MIN_VALUE);
	}

	public void testSaturatedCast() {
	for (byte value : VALUES) {
	assertEquals(value,
	UnsignedBytes.saturatedCast(UnsignedBytes.toInt(value)));
	}
	assertEquals(GREATEST, UnsignedBytes.saturatedCast(256L));
	assertEquals(LEAST, UnsignedBytes.saturatedCast(-1L));
	assertEquals(GREATEST, UnsignedBytes.saturatedCast(Long.MAX_VALUE));
	assertEquals(LEAST, UnsignedBytes.saturatedCast(Long.MIN_VALUE));
	}

	private static void assertCastFails(long value) {
	try {
	UnsignedBytes.checkedCast(value);
	fail("Cast to byte should have failed: " + value);
	} catch (IllegalArgumentException ex) {
	assertTrue(value + " not found in exception text: " + ex.getMessage(),
	ex.getMessage().contains(String.valueOf(value)));
	}
	}

	public void testCompare() {
	// This is the only ordering for primitives that does not have a
	// corresponding Comparable wrapper in java.lang.
	for (int i = 0; i < VALUES.length; i++) {
	for (int j = 0; j < VALUES.length; j++) {
	byte x = VALUES[i];
	byte y = VALUES[j];
	// note: spec requires only that the sign is the same
	assertEquals(x + ", " + y,
	Math.signum(UnsignedBytes.compare(x, y)),
	Math.signum(Ints.compare(i, j)));
	}
	}
	}

	public void testMax_noArgs() {
	try {
	UnsignedBytes.max();
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testMax() {
	assertEquals(LEAST, UnsignedBytes.max(LEAST));
	assertEquals(GREATEST, UnsignedBytes.max(GREATEST));
	assertEquals((byte) 255, UnsignedBytes.max(
	(byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
	}

	public void testMin_noArgs() {
	try {
	UnsignedBytes.min();
	fail();
	} catch (IllegalArgumentException expected) {
	}
	}

	public void testMin() {
	assertEquals(LEAST, UnsignedBytes.min(LEAST));
	assertEquals(GREATEST, UnsignedBytes.min(GREATEST));
	assertEquals((byte) 0, UnsignedBytes.min(
	(byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
	assertEquals((byte) 0, UnsignedBytes.min(
	(byte) -1, (byte) 127, (byte) 1, (byte) -128, (byte) 0));
	}

	private static void assertParseFails(String value) {
	try {
	UnsignedBytes.parseUnsignedByte(value);
	fail();
	} catch (NumberFormatException expected) {
	}
	}

	public void testParseUnsignedByte() {
	// We can easily afford to test this exhaustively.
	for (int i = 0; i <= 0xff; i++) {
	assertEquals((byte) i, UnsignedBytes.parseUnsignedByte(Integer.toString(i)));
	}
	assertParseFails("1000");
	assertParseFails("-1");
	assertParseFails("-128");
	assertParseFails("256");
	}

	public void testMaxValue() {
	assertTrue(UnsignedBytes
	.compare(UnsignedBytes.MAX_VALUE, (byte) (UnsignedBytes.MAX_VALUE + 1)) > 0);
	}

	private static void assertParseFails(String value, int radix) {
	try {
	UnsignedBytes.parseUnsignedByte(value, radix);
	fail();
	} catch (NumberFormatException expected) {
	}
	}

	public void testParseUnsignedByteWithRadix() throws NumberFormatException {
	// We can easily afford to test this exhaustively.
	for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
	for (int i = 0; i <= 0xff; i++) {
	assertEquals((byte) i, UnsignedBytes.parseUnsignedByte(Integer.toString(i, radix), radix));
	}
	assertParseFails(Integer.toString(1000, radix), radix);
	assertParseFails(Integer.toString(-1, radix), radix);
	assertParseFails(Integer.toString(-128, radix), radix);
	assertParseFails(Integer.toString(256, radix), radix);
	}
	}

	public void testParseUnsignedByteThrowsExceptionForInvalidRadix() {
	// Valid radix values are Character.MIN_RADIX to Character.MAX_RADIX,
	// inclusive.
	try {
	UnsignedBytes.parseUnsignedByte("0", Character.MIN_RADIX - 1);
	fail();
	} catch (NumberFormatException nfe) {
	// expected
	}

	try {
	UnsignedBytes.parseUnsignedByte("0", Character.MAX_RADIX + 1);
	fail();
	} catch (NumberFormatException nfe) {
	// expected
	}

	// The radix is used as an array index, so try a negative value.
	try {
	UnsignedBytes.parseUnsignedByte("0", -1);
	fail();
	} catch (NumberFormatException nfe) {
	// expected
	}
	}

	public void testToString() {
	// We can easily afford to test this exhaustively.
	for (int i = 0; i <= 0xff; i++) {
	assertEquals(Integer.toString(i), UnsignedBytes.toString((byte) i));
	}
	}

	public void testToStringWithRadix() {
	// We can easily afford to test this exhaustively.
	for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
	for (int i = 0; i <= 0xff; i++) {
	assertEquals(Integer.toString(i, radix), UnsignedBytes.toString((byte) i, radix));
	}
	}
	}

	public void testJoin() {
	assertEquals("", UnsignedBytes.join(",", new byte[] {}));
	assertEquals("1", UnsignedBytes.join(",", new byte[] {(byte) 1}));
	assertEquals("1,2", UnsignedBytes.join(",", (byte) 1, (byte) 2));
	assertEquals("123", UnsignedBytes.join("", (byte) 1, (byte) 2, (byte) 3));
	assertEquals("128,255", UnsignedBytes.join(",", (byte) 128, (byte) -1));
	}

	public void testLexicographicalComparatorDefaultChoice() {
	Comparator<byte[]> defaultComparator =
	UnsignedBytes.lexicographicalComparator();
	Comparator<byte[]> pureJavaComparator =
	UnsignedBytes.LexicographicalComparatorHolder.PureJavaComparator.INSTANCE;
	assertSame(defaultComparator, pureJavaComparator);
	}

	public void testLexicographicalComparator() {
	List<byte[]> ordered = Arrays.asList(
	new byte[] {},
	new byte[] {LEAST},
	new byte[] {LEAST, LEAST},
	new byte[] {LEAST, (byte) 1},
	new byte[] {(byte) 1},
	new byte[] {(byte) 1, LEAST},
	new byte[] {GREATEST, GREATEST - (byte) 1},
	new byte[] {GREATEST, GREATEST},
	new byte[] {GREATEST, GREATEST, GREATEST});

	// The Unsafe implementation if it's available. Otherwise, the Java implementation.
	Comparator<byte[]> comparator = UnsignedBytes.lexicographicalComparator();
	Helpers.testComparator(comparator, ordered);
	assertSame(comparator, SerializableTester.reserialize(comparator));

	// The Java implementation.
	Comparator<byte[]> javaImpl = UnsignedBytes.lexicographicalComparatorJavaImpl();
	Helpers.testComparator(javaImpl, ordered);
	assertSame(javaImpl, SerializableTester.reserialize(javaImpl));
	}

	@SuppressWarnings("unchecked")
	public void testLexicographicalComparatorLongInputs() {
	for (Comparator<byte[]> comparator : Arrays.asList(
	UnsignedBytes.lexicographicalComparator(),
	UnsignedBytes.lexicographicalComparatorJavaImpl())) {
	for (int i = 0; i < 32; i++) {
	byte[] left = new byte[32];
	byte[] right = new byte[32];

	assertTrue(comparator.compare(left, right) == 0);
	left[i] = 1;
	assertTrue(comparator.compare(left, right) > 0);
	assertTrue(comparator.compare(right, left) < 0);
	}
	}
	}

	public void testNulls() {
	new NullPointerTester().testAllPublicStaticMethods(UnsignedBytes.class);
	}
	}