/**
* See "Effective Java" under "Consider Implementing Comparable".
*
* @param x an object to compare
* @param y an object to compare
* @param z an object to compare
* @param testTransients Whether to include transients in the comparison
* @param excludeFields fields to exclude
*/
private void assertReflectionCompareContract(
final Object x,
final Object y,
final Object z,
final boolean testTransients,
final String[] excludeFields) {
// signum
assertTrue(
reflectionCompareSignum(x, y, testTransients, excludeFields)
== -reflectionCompareSignum(y, x, testTransients, excludeFields));
// transitive
if (CompareToBuilder.reflectionCompare(x, y, testTransients, null, excludeFields) > 0
&& CompareToBuilder.reflectionCompare(y, z, testTransients, null, excludeFields) > 0) {
assertTrue(CompareToBuilder.reflectionCompare(x, z, testTransients, null, excludeFields) > 0);
}
// un-named
if (CompareToBuilder.reflectionCompare(x, y, testTransients, null, excludeFields) == 0) {
assertTrue(
reflectionCompareSignum(x, z, testTransients, excludeFields)
== -reflectionCompareSignum(y, z, testTransients, excludeFields));
}
// strongly recommended but not strictly required
assertTrue(
CompareToBuilder.reflectionCompare(x, y, testTransients)
== 0
== EqualsBuilder.reflectionEquals(x, y, testTransients));
}
private void testReflectionHierarchyCompare(
final boolean testTransients, final String[] excludeFields) {
final TestObject to1 = new TestObject(1);
final TestObject to2 = new TestObject(2);
final TestObject to3 = new TestObject(3);
final TestSubObject tso1 = new TestSubObject(1, 1);
final TestSubObject tso2 = new TestSubObject(2, 2);
final TestSubObject tso3 = new TestSubObject(3, 3);
assertReflectionCompareContract(to1, to1, to1, false, excludeFields);
assertReflectionCompareContract(to1, to2, to3, false, excludeFields);
assertReflectionCompareContract(tso1, tso1, tso1, false, excludeFields);
assertReflectionCompareContract(tso1, tso2, tso3, false, excludeFields);
assertReflectionCompareContract("1", "2", "3", false, excludeFields);
assertTrue(
0 != CompareToBuilder.reflectionCompare(tso1, new TestSubObject(1, 0), testTransients));
assertTrue(
0 != CompareToBuilder.reflectionCompare(tso1, new TestSubObject(0, 1), testTransients));
// root class
assertXYZCompareOrder(to1, to2, to3, true, null);
// subclass
assertXYZCompareOrder(tso1, tso2, tso3, true, null);
}
@Test
public void testReflectionCompare() {
final TestObject o1 = new TestObject(4);
final TestObject o2 = new TestObject(4);
assertTrue(CompareToBuilder.reflectionCompare(o1, o1) == 0);
assertTrue(CompareToBuilder.reflectionCompare(o1, o2) == 0);
o2.setA(5);
assertTrue(CompareToBuilder.reflectionCompare(o1, o2) < 0);
assertTrue(CompareToBuilder.reflectionCompare(o2, o1) > 0);
}
/**
* Returns the signum of the result of comparing x and y with <code>
* CompareToBuilder.reflectionCompare</code>
*
* @param lhs The "left-hand-side" of the comparison.
* @param rhs The "right-hand-side" of the comparison.
* @param testTransients Whether to include transients in the comparison
* @param excludeFields fields to exclude
* @return int The signum
*/
private int reflectionCompareSignum(
final Object lhs,
final Object rhs,
final boolean testTransients,
final String[] excludeFields) {
return BigInteger.valueOf(CompareToBuilder.reflectionCompare(lhs, rhs, testTransients))
.signum();
}
private void assertXYZCompareOrder(
final Object x,
final Object y,
final Object z,
final boolean testTransients,
final String[] excludeFields) {
assertTrue(0 == CompareToBuilder.reflectionCompare(x, x, testTransients, null, excludeFields));
assertTrue(0 == CompareToBuilder.reflectionCompare(y, y, testTransients, null, excludeFields));
assertTrue(0 == CompareToBuilder.reflectionCompare(z, z, testTransients, null, excludeFields));
assertTrue(0 > CompareToBuilder.reflectionCompare(x, y, testTransients, null, excludeFields));
assertTrue(0 > CompareToBuilder.reflectionCompare(x, z, testTransients, null, excludeFields));
assertTrue(0 > CompareToBuilder.reflectionCompare(y, z, testTransients, null, excludeFields));
assertTrue(0 < CompareToBuilder.reflectionCompare(y, x, testTransients, null, excludeFields));
assertTrue(0 < CompareToBuilder.reflectionCompare(z, x, testTransients, null, excludeFields));
assertTrue(0 < CompareToBuilder.reflectionCompare(z, y, testTransients, null, excludeFields));
}
public int compareTo(Object o) {
return CompareToBuilder.reflectionCompare(this, o);
}
@Test(expected = ClassCastException.class)
public void testReflectionCompareEx2() {
final TestObject o1 = new TestObject(4);
final Object o2 = new Object();
CompareToBuilder.reflectionCompare(o1, o2);
}
@Test(expected = NullPointerException.class)
public void testReflectionCompareEx1() {
final TestObject o1 = new TestObject(4);
CompareToBuilder.reflectionCompare(o1, null);
}
