org.norther.tammi.core.rt.util
Class AttributeComparator

java.lang.Object
  org.norther.tammi.acorn.util.PropertyComparator
      org.norther.tammi.core.rt.util.AttributeComparator

All Implemented Interfaces:

Serializable, Comparator

public class AttributeComparator
extends PropertyComparator

A comparator for attributes.

Author:

Ilkka Priha

See Also:

Serialized Form

Constructor Summary

AttributeComparator(String attr)
Constructs a new comparator.

AttributeComparator(String[] attrs)
Constructs a new comparator for multiple attributes.

AttributeComparator(String[] attrs, Comparator comp)
Constructs a new comparator for multiple attributes with a value comparator.

AttributeComparator(String attr, Comparator comp)
Constructs a new comparator with a value comparator.

Method Summary

int	compare(Object var1, Object var2) Compares two variables.
protected Object	getProperty(Object obj, String prop) Gets the named property value.

Methods inherited from class org.norther.tammi.acorn.util.PropertyComparator

compare, getNestedProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

AttributeComparator

public AttributeComparator(String attr)

Constructs a new comparator.

Parameters:

attr - the attribute to compare.

AttributeComparator

public AttributeComparator(String attr,
                           Comparator comp)

Constructs a new comparator with a value comparator.

Parameters:

attr - the attribute to compare.

comp - the attribute value comparator.

AttributeComparator

public AttributeComparator(String[] attrs)

Constructs a new comparator for multiple attributes.

Parameters:

attrs - the attributes to compare.

AttributeComparator

public AttributeComparator(String[] attrs,
                           Comparator comp)

Constructs a new comparator for multiple attributes with a value comparator.

Parameters:

attrs - the attributes to compare.

comp - the attribute value comparator.

Method Detail

compare

public int compare(Object var1,
                   Object var2)

Compares two variables.

Specified by:

compare in interface Comparator

Overrides:

compare in class PropertyComparator

Parameters:

var1 - the first variable to be compared.

var2 - the second variable to be compared.

Returns:

-1, 0 or 1 based on comparison.

getProperty

protected Object getProperty(Object obj,
                             String prop)
                      throws Exception

Description copied from class: PropertyComparator

Gets the named property value.

Overrides:

getProperty in class PropertyComparator

Parameters:

obj - the object.

prop - the property.

Returns:

the value or null.

Throws:

Exception - on errors.