blackboard.platform.plugin
Class PlugInComparator

java.lang.Object
  |
  +--blackboard.platform.plugin.PlugInComparator

All Implemented Interfaces:

java.util.Comparator

public class PlugInComparator

extends java.lang.Object

implements java.util.Comparator

Comparator implementation to sort lists of PlugIns. The mode property is used to select the PlugIn attribute to use for the sort.

Since:

Blackboard 6

Version:

$Revision: 3 $ $Date: 7/01/02 5:23p $

Field Summary

static int	MODE_AVAILABILITY PlugIns are compared based on the isAvailable attribute
static int	MODE_NAME PlugIn objects are compared based on the name attribute
static int	MODE_VENDOR PlugIns are compared on the vendorName attribute
static int	MODE_VERSION PlugIns are compared on the Version attribute

Constructor Summary

PlugInComparator(int mode)
Instantiates a comparator with the specified mode.

Method Summary

int	compare(java.lang.Object o1, java.lang.Object o2) Compares its two arguments for order.

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

Field Detail

MODE_NAME

public static final int MODE_NAME

PlugIn objects are compared based on the name attribute

See Also:

Constant Field Values

MODE_AVAILABILITY

public static final int MODE_AVAILABILITY

PlugIns are compared based on the isAvailable attribute

See Also:

Constant Field Values

MODE_VERSION

public static final int MODE_VERSION

PlugIns are compared on the Version attribute

See Also:

Constant Field Values

MODE_VENDOR

public static final int MODE_VENDOR

PlugIns are compared on the vendorName attribute

See Also:

Constant Field Values

Constructor Detail

PlugInComparator

public PlugInComparator(int mode)

Instantiates a comparator with the specified mode.

Parameters:

mode - Comparison mode. Should match to one of the MODE_* constants defined on this class

Method Detail

compare

public int compare(java.lang.Object o1,
                   java.lang.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.

Behavior depends on the mode

Specified by:

compare in interface java.util.Comparator

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.

Throws:

java.lang.ClassCastException - if the arguments' types prevent them from being compared by this Comparator.