net.christopherschultz.evaluator.util
Class ConstantLoader

java.lang.Object
  net.christopherschultz.evaluator.util.ConstantLoader

public class ConstantLoader
extends Object

Utility class to help load constants, functions, and properties for an EvaluationContext.

Version:

$Revision: 1.6 $ $Date: 2008-06-20 22:58:48 $

Author:

Chris Schultz

Field Summary

static String

BLANK_NULL A Boolean property that, when set to true, will cause blank strings to return null from getValue(java.lang.String) instead of an empty string.

Constructor Summary

ConstantLoader()
Creates a new ConstantLoader.

Method Summary

Object	getObject(String className)
Object	getProperty(String name) Gets the value of the specified property.
String	getPropertyName(String propertyName) Deprecated. This method is confusing at best. It's basically just a cast.
Object	getValue(String valueStr) Converts a String into a value object.
Object	newObjectInstance(String className)
void	setProperty(String name, Object value) Sets a ConstantLoader property.

Methods inherited from class java.lang.Object

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

Field Detail

BLANK_NULL

public static final String BLANK_NULL

A Boolean property that, when set to true, will cause blank strings to return null from getValue(java.lang.String) instead of an empty string.

See Also:

setProperty(java.lang.String, java.lang.Object), getProperty(java.lang.String)

Constructor Detail

ConstantLoader

public ConstantLoader()

Creates a new ConstantLoader.

Method Detail

setProperty

public void setProperty(String name,
                        Object value)

Sets a ConstantLoader property. See individual properties for their effects.

Parameters:

name - The name of the property.

value - The value of the property.

getProperty

public Object getProperty(String name)

Gets the value of the specified property.

Parameters:

name - The name of the property.

Returns:

The value of the specified property, or null if that property has not been set to a specific value.

getPropertyName

public String getPropertyName(String propertyName)

Deprecated. This method is confusing at best. It's basically just a cast.

newObjectInstance

public Object newObjectInstance(String className)

getObject

public Object getObject(String className)

getValue

public Object getValue(String valueStr)

Converts a String into a value object. This method determines what type of object to return using the following rules:

Rule	Resulting Object Type	Example
Value is 'null' null (or "" (empty string) if BLANK_NULL is true)	null	null
Value is surrounded by ' or " characters.	String	"1.0", 'what (if any)', "null"
Value contains '#'	(depends)	java.lang.Boolean#TRUE, java.lang.Integer#MAX_VALUE
Value contains '('	(depends)	java.lang.Integer(3)
Value is 'true' or 'false' (case insensitive).	java.lang.Boolean	'true' or 'false'
Value contains numbers including a '.' (or ends with 'd') (optional sign)	java.lang.Double	3.14159, 100d, 0.5, -2.0
Value contains numbers and ends with 'f' (optional sign)	java.lang.Float	3.14159f, 100f, -2f
Value contains digits only (optional sign)	java.lang.Integer	2145, -40, 908
Value contains digits only and ends with 'l' (optional sign)	java.lang.Long	2145l, -40l, 908l
(all others)	java.lang.String	(anything else)