org.pentaho.reporting.libraries.serializer
public class ClassComparator extends Object implements Comparator, Serializable
Constructor Summary | |
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ClassComparator()
Defaultconstructor. |
Method Summary | |
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int | compare(Object o1, Object o2)
Compares its two arguments for order. |
boolean | isComparable(Class c1, Class c2)
Checks, whether the given classes are comparable. |
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."
Parameters: o1 the first object to be compared. o2 the second object to be compared.
Returns: a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
Parameters: c1 the first class to compare c2 the second class to compare
Returns: true, if the classes share a direct relation, false otherwise.