wyvern.lib.predicates
Class PropertyPredicate

java.lang.Object
  wyvern.lib.predicates.PropertyPredicate

All Implemented Interfaces:

Predicate

public class PropertyPredicate

extends java.lang.Object

implements Predicate

Checks the object for the presence of a specified property, or any property from a specified list. Considers the property not to be present if its value is null, false, or zero, unless it's a "tag" property with no value.

Version:

1.0, Nov 20, 1997

Author:

Steve Yegge

Field Summary

protected java.lang.String[]

properties_

Constructor Summary

PropertyPredicate()

PropertyPredicate(java.lang.String prop)
Constructs a new PropertyPredicate for a given property.

PropertyPredicate(java.lang.String[] props)
Constructs a new PropertyPredicate for an array of strings.

Method Summary

boolean	predicate(GameObject obj) Return true if the passed object has one of the listed properties.
void	setProperty(java.lang.String propertyName)

Methods inherited from class java.lang.Object

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

Field Detail

properties_

protected java.lang.String[] properties_

Constructor Detail

PropertyPredicate

public PropertyPredicate()

PropertyPredicate

public PropertyPredicate(java.lang.String prop)

Constructs a new PropertyPredicate for a given property.

Parameters:

prop - the name of the property in question

PropertyPredicate

public PropertyPredicate(java.lang.String[] props)

Constructs a new PropertyPredicate for an array of strings.

Parameters:

props - an array of property names for which to return 'true', if the property is found and has a non-default value.

Method Detail

setProperty

public void setProperty(java.lang.String propertyName)

predicate

public boolean predicate(GameObject obj)

Return true if the passed object has one of the listed properties.

Specified by:

predicate in interface Predicate

Parameters:

obj - any GameObject

Returns:

true if it has a non-default value for one of the properties specified in the constructor for this Predicate.