objectutilstests.java

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/*
 * Copyright 2002-2006 the original author or 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 org.springframework.util;

import java.io.IOException;

import javax.servlet.ServletException;

import junit.framework.TestCase;

import org.springframework.beans.FatalBeanException;

/**
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Rick Evans
 */
public final class ObjectUtilsTests extends TestCase {

	public void testIsCheckedException() {
		assertTrue(ObjectUtils.isCheckedException(new Exception()));
		assertTrue(ObjectUtils.isCheckedException(new ServletException()));

		assertFalse(ObjectUtils.isCheckedException(new RuntimeException()));
		assertFalse(ObjectUtils.isCheckedException(new FatalBeanException("")));

		// Any Throwable other than RuntimeException and Error
		// has to be considered checked according to the JLS.
		assertTrue(ObjectUtils.isCheckedException(new Throwable()));
	}

	public void testIsCompatibleWithThrowsClause() {
		Class[] empty = new Class[0];
		Class[] exception = new Class[] {Exception.class};
		Class[] servletAndIO = new Class[] {ServletException.class, IOException.class};
		Class[] throwable = new Class[] {Throwable.class};

		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new RuntimeException(), null));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new RuntimeException(), empty));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new RuntimeException(), exception));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new RuntimeException(), servletAndIO));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new RuntimeException(), throwable));

		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Exception(), null));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Exception(), empty));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new Exception(), exception));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Exception(), servletAndIO));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new Exception(), throwable));

		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new ServletException(), null));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new ServletException(), empty));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new ServletException(), exception));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new ServletException(), servletAndIO));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new ServletException(), throwable));

		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Throwable(), null));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Throwable(), empty));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Throwable(), exception));
		assertFalse(ObjectUtils.isCompatibleWithThrowsClause(new Throwable(), servletAndIO));
		assertTrue(ObjectUtils.isCompatibleWithThrowsClause(new Throwable(), throwable));
	}

	public void testToObjectArray() {
		int[] a = new int[] {1, 2, 3, 4, 5};
		Integer[] wrapper = (Integer[]) ObjectUtils.toObjectArray(a);
		assertTrue(wrapper.length == 5);
		for (int i = 0; i < wrapper.length; i++) {
			assertEquals(a[i], wrapper[i].intValue());
		}
	}

	public void testToObjectArrayWithNull() {
		Object[] objects = ObjectUtils.toObjectArray(null);
		assertNotNull(objects);
		assertEquals(0, objects.length);
	}

	public void testToObjectArrayWithEmptyPrimitiveArray() {
		Object[] objects = ObjectUtils.toObjectArray(new byte[] {});
		assertNotNull(objects);
		assertEquals(0, objects.length);
	}

	public void testToObjectArrayWithNonArrayType() {
		try {
			ObjectUtils.toObjectArray("Not an []");
			fail("Must have thrown an IllegalArgumentException by this point.");
		}
		catch (IllegalArgumentException expected) {
		}
	}

	public void testToObjectArrayWithNonPrimitiveArray() {
		try {
			ObjectUtils.toObjectArray(new String[] {"Bingo"});
			fail("Must have thrown an IllegalArgumentException by this point.");
		}
		catch (IllegalArgumentException expected) {
		}
	}

	public void testAddObjectToArraySunnyDay() {
		String[] array = new String[] {"foo", "bar"};
		String newElement = "baz";
		Object[] newArray = ObjectUtils.addObjectToArray(array, newElement);
		assertEquals(3, newArray.length);
		assertEquals(newElement, newArray[2]);
	}

	public void testAddObjectToArrayWhenEmpty() {
		String[] array = new String[0];
		String newElement = "foo";
		Object[] newArray = ObjectUtils.addObjectToArray(array, newElement);
		assertEquals(1, newArray.length);
		assertEquals(newElement, newArray[0]);
	}

	public void testAddObjectToSingleNonNullElementArray() {
		String existingElement = "foo";
		String[] array = new String[] {existingElement};
		String newElement = "bar";
		Object[] newArray = ObjectUtils.addObjectToArray(array, newElement);
		assertEquals(2, newArray.length);
		assertEquals(existingElement, newArray[0]);
		assertEquals(newElement, newArray[1]);
	}

	public void testAddObjectToSingleNullElementArray() {
		String[] array = new String[] {null};
		String newElement = "bar";
		Object[] newArray = ObjectUtils.addObjectToArray(array, newElement);
		assertEquals(2, newArray.length);
		assertEquals(null, newArray[0]);
		assertEquals(newElement, newArray[1]);
	}

	public void testAddObjectToNullArray() throws Exception {
		String newElement = "foo";
		Object[] newArray = ObjectUtils.addObjectToArray(null, newElement);
		assertEquals(1, newArray.length);
		assertEquals(newElement, newArray[0]);
	}

	public void testAddNullObjectToNullArray() throws Exception {
		Object[] newArray = ObjectUtils.addObjectToArray(null, null);
		assertEquals(1, newArray.length);
		assertEquals(null, newArray[0]);
	}

	public void testNullSafeEqualsWithArrays() throws Exception {
		assertTrue(ObjectUtils.nullSafeEquals(new String[] {"a", "b", "c"}, new String[] {"a", "b", "c"}));
		assertTrue(ObjectUtils.nullSafeEquals(new int[] {1, 2, 3}, new int[] {1, 2, 3}));
	}

	public void testHashCodeWithBooleanFalse() {
		int expected = Boolean.FALSE.hashCode();
		assertEquals(expected, ObjectUtils.hashCode(false));
	}

	public void testHashCodeWithBooleanTrue() {
		int expected = Boolean.TRUE.hashCode();
		assertEquals(expected, ObjectUtils.hashCode(true));
	}

	public void testHashCodeWithDouble() {
		double dbl = 9830.43;
		int expected = (new Double(dbl)).hashCode();
		assertEquals(expected, ObjectUtils.hashCode(dbl));
	}

	public void testHashCodeWithFloat() {
		float flt = 34.8f;
		int expected = (new Float(flt)).hashCode();
		assertEquals(expected, ObjectUtils.hashCode(flt));
	}

	public void testHashCodeWithLong() {
		long lng = 883l;
		int expected = (new Long(lng)).hashCode();
		assertEquals(expected, ObjectUtils.hashCode(lng));
	}

	public void testIdentityToString() {
		Object obj = new Object();
		String expected = obj.getClass().getName() + "@" + ObjectUtils.getIdentityHexString(obj);
		String actual = ObjectUtils.identityToString(obj);
		assertEquals(expected.toString(), actual);
	}

	public void testIdentityToStringWithNullObject() {
		assertEquals("", ObjectUtils.identityToString(null));
	}

	public void testIsArrayOfPrimitivesWithBooleanArray() {
		assertTrue(ClassUtils.isPrimitiveArray(boolean[].class));
	}

	public void testIsArrayOfPrimitivesWithObjectArray() {
		assertFalse(ClassUtils.isPrimitiveArray(Object[].class));
	}

	public void testIsArrayOfPrimitivesWithNonArray() {
		assertFalse(ClassUtils.isPrimitiveArray(String.class));
	}

	public void testIsPrimitiveOrWrapperWithBooleanPrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(boolean.class));
	}

	public void testIsPrimitiveOrWrapperWithBooleanWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Boolean.class));
	}

	public void testIsPrimitiveOrWrapperWithBytePrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(byte.class));
	}

	public void testIsPrimitiveOrWrapperWithByteWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Byte.class));
	}

	public void testIsPrimitiveOrWrapperWithCharacterClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Character.class));
	}

	public void testIsPrimitiveOrWrapperWithCharClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(char.class));
	}

	public void testIsPrimitiveOrWrapperWithDoublePrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(double.class));
	}

	public void testIsPrimitiveOrWrapperWithDoubleWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Double.class));
	}

	public void testIsPrimitiveOrWrapperWithFloatPrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(float.class));
	}

	public void testIsPrimitiveOrWrapperWithFloatWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Float.class));
	}

	public void testIsPrimitiveOrWrapperWithIntClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(int.class));
	}

	public void testIsPrimitiveOrWrapperWithIntegerClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Integer.class));
	}

	public void testIsPrimitiveOrWrapperWithLongPrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(long.class));
	}

	public void testIsPrimitiveOrWrapperWithLongWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Long.class));
	}

	public void testIsPrimitiveOrWrapperWithNonPrimitiveOrWrapperClass() {
		assertFalse(ClassUtils.isPrimitiveOrWrapper(Object.class));
	}

	public void testIsPrimitiveOrWrapperWithShortPrimitiveClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(short.class));
	}

	public void testIsPrimitiveOrWrapperWithShortWrapperClass() {
		assertTrue(ClassUtils.isPrimitiveOrWrapper(Short.class));
	}

	public void testNullSafeHashCodeWithBooleanArray() {
		int expected = 31 * 7 + Boolean.TRUE.hashCode();
		expected = 31 * expected + Boolean.FALSE.hashCode();

		boolean[] array = {true, false};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithBooleanArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((boolean[]) null));
	}

	public void testNullSafeHashCodeWithByteArray() {
		int expected = 31 * 7 + 8;
		expected = 31 * expected + 10;

		byte[] array = {8, 10};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithByteArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((byte[]) null));
	}

	public void testNullSafeHashCodeWithCharArray() {