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

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

All Implemented Interfaces:

Serializable, Comparator<Object>

public class VariableComparator
extends PropertyComparator

A comparator for named attributes of variables.

Version:

$Id: VariableComparator.java,v 1.2 2009/09/28 15:08:44 cvsimp Exp $

Author:

Ilkka Priha

See Also:

Serialized Form

Constructor Summary

VariableComparator(String attr)
Constructs a new comparator.

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

VariableComparator(String[] attrs, Comparator<?> comp)
Constructs a new comparator for multiple attributes with a value comparator.

VariableComparator(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

VariableComparator

public VariableComparator(String attr)

Constructs a new comparator.

Parameters:

attr - the attribute to compare.

VariableComparator

public VariableComparator(String attr,
                          Comparator<?> comp)

Constructs a new comparator with a value comparator.

Parameters:

attr - the attribute to compare.

comp - the attribute value comparator.

VariableComparator

public VariableComparator(String[] attrs)

Constructs a new comparator for multiple attributes.

Parameters:

attrs - the attributes to compare.

VariableComparator

public VariableComparator(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<Object>

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.