net.sf.doolin.util.expression
Class Expression

java.lang.Object
  net.sf.doolin.util.expression.Expression

Direct Known Subclasses:

BusExpression

public class Expression
extends Object

A Expression is basically a text string whose content can be created from bundle keys or properties in a bean model.

Tokens that are used are:

• \@{propertyPath} - this token is replaced by the value defined by the property in the bean model.
• %{key} or #{key} - this token is replaced by a string whose bundle key is key. If the key has parameters, parameters can be indicated using %{key:param1,param2} where parameters themselves are Expression instances.
• Any other text is considered as hard-coded text
• The \ character can be used to escape any special character

Author:

Damien Coraboeuf

Constructor Summary

Expression(Locale locale, Object context, String pattern)
Parses the expression

Expression(Locale locale, String text)
Builds an expression with a fixed text.

Expression(Object context, String pattern)
Parses the expression

Expression(String text)
Builds an expression with a fixed text and for the default locale

Method Summary

protected void	evaluate() Internal method used to evaluate the value of the expression.
String	getValue() Gets the value for the expression
boolean	isVariable() Checks if the expression contains parts which can vary according to the model.
protected void	setValue(String newValue) Internal method that sets a new value to the expression
String	toString()
protected void	visitTokensWith(TokenVisitor visitor) Visits a the whole token tree with a visitor.

Methods inherited from class java.lang.Object

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

Constructor Detail

Expression

public Expression(Locale locale,
                  Object context,
                  String pattern)

Parses the expression

Parameters:

locale - Locale for the expression

context - Context object

pattern - Pattern used to build the expression

Expression

public Expression(Locale locale,
                  String text)

Builds an expression with a fixed text.

Parameters:

locale - Locale for this expression

text - Fixed value for this expression (not parsed)

Expression

public Expression(Object context,
                  String pattern)

Parses the expression

Parameters:

context - Context object

pattern - Pattern used to build the expression

Expression

public Expression(String text)

Builds an expression with a fixed text and for the default locale

Parameters:

text - Fixed text (not parsed)

See Also:

Locale.getDefault()

Method Detail

evaluate

protected void evaluate()

Internal method used to evaluate the value of the expression.

getValue

public String getValue()

Gets the value for the expression

Returns:

Value

isVariable

public boolean isVariable()

Checks if the expression contains parts which can vary according to the model.

Returns:

true if some parts of the expression are dependent on the model.

setValue

protected void setValue(String newValue)

Internal method that sets a new value to the expression

Parameters:

newValue - New value

toString

public String toString()

Overrides:

toString in class Object

visitTokensWith

protected void visitTokensWith(TokenVisitor visitor)

Visits a the whole token tree with a visitor.

Parameters:

visitor - Visitor to apply for each token.