Package VASSAL.script.expression

Class Expression

java.lang.Object

VASSAL.script.expression.Expression

Direct Known Subclasses:

BeanShellExpression, FormattedStringExpression, IntExpression, NullExpression, PropertyMatchExpression, SinglePropertyExpression, StringExpression

public abstract class Expression
extends Object

An abstract class representing an expression that can be evaluated. Subclasses implement specific types of expression and the way they are evaluated.

Constructor Summary

Constructors

Constructor	Description
Expression()

Method Summary

Modifier and Type	Method	Description
static Expression	createExpression(String s)	Factory method to create an appropriate expression based on the supplied String.
static Expression	createPropertyExpression(String s)	Factory method to create a new Property Match Expression.
static Expression	createSimplePropertyExpression(String s)	Factory method to create a Beanshell expression of a value that is known to be a property name.
boolean	equals(Object obj)
String	evaluate()
String	evaluate(boolean localized)
String	evaluate(PropertySource ps)
String	evaluate(PropertySource ps, boolean localized)
abstract String	evaluate(PropertySource ps, Map<String,String> properties, boolean localized)	Each subclass must implement evaluate() to evaluate itself
String	getExpression()
PieceFilter	getFilter()
PieceFilter	getFilter(PropertySource ps)	Return a PieceFilter using the expression.
int	hashCode()
void	setExpression(String s)
abstract String	toBeanShellString()	Output a BeanShell equivalent of this expression.

Methods inherited from class java.lang.Object

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

Constructor Details

Expression

public Expression()

Method Details

setExpression

public void setExpression(String s)

getExpression

public String getExpression()

evaluate

public abstract String evaluate(PropertySource ps,
Map<String,String> properties,
boolean localized)
                         throws ExpressionException

Each subclass must implement evaluate() to evaluate itself

Parameters:

ps - Property Source providing property values

properties - default property values

localized - localize property calls?

Returns:

evaluated String.

Throws:

ExpressionException

evaluate

public String evaluate()
                throws ExpressionException

Throws:

ExpressionException

evaluate

public String evaluate(PropertySource ps)
                throws ExpressionException

Throws:

ExpressionException

evaluate

public String evaluate(PropertySource ps,
boolean localized)
                throws ExpressionException

Throws:

ExpressionException

evaluate

public String evaluate(boolean localized)
                throws ExpressionException

Throws:

ExpressionException

getFilter

public PieceFilter getFilter(PropertySource ps)

Return a PieceFilter using the expression.

Parameters:

ps - PropertySource to use as source of filter

Returns:

Created PieceFilter

getFilter

public PieceFilter getFilter()

toBeanShellString

public abstract String toBeanShellString()

Output a BeanShell equivalent of this expression.

Returns:

BeanShell equivalent

createExpression

public static Expression createExpression(String s)

Factory method to create an appropriate expression based on the supplied String. The majority of expressions in a module are going to be blank, integers or simple strings, so return optimised Expression subclasses for these types.

createPropertyExpression

public static Expression createPropertyExpression(String s)

Factory method to create a new Property Match Expression.

Parameters:

s - Expression string

Returns:

Generated Expression

createSimplePropertyExpression

public static Expression createSimplePropertyExpression(String s)

Factory method to create a Beanshell expression of a value that is known to be a property name. Used to convert values such as the Follow proprty field in Embellishment

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object