Class ClassComparator

  extended by org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.base.ClassComparator
All Implemented Interfaces:
Serializable, Comparator

Deprecated. Moved to org.jfree.util

public class ClassComparator
extends Object
implements Comparator, Serializable

The class comparator can be used to compare and sort classes and their superclasses. The comparator is not able to compare classes which have no relation...

Thomas Morgner
See Also:
Serialized Form

Constructor Summary
          Deprecated. Defaultconstructor.
Method Summary
 int compare(Object o1, Object o2)
          Deprecated. Compares its two arguments for order.
 boolean isComparable(Class c1, Class c2)
          Deprecated. Checks whether the given classes are comparable.
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface java.util.Comparator

Constructor Detail


public ClassComparator()

Method Detail


public int compare(Object o1,
                   Object o2)
Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Note: throws ClassCastException if the arguments' types prevent them from being compared by this Comparator. And IllegalArgumentException if the classes share no relation.

The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)

The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.

Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.

It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."

Specified by:
compare in interface Comparator
o1 - the first object to be compared.
o2 - the second object to be compared.
a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.


public boolean isComparable(Class c1,
                            Class c2)
Checks whether the given classes are comparable. This method will return true, if one of the classes is assignable from the other class.

c1 - the first class to compare
c2 - the second class to compare
true, if the classes share a direct relation, false otherwise.