org.jboss.seam.core
Class Expressions

java.lang.Object
  org.jboss.seam.core.Expressions

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

FacesExpressions

@Scope(value=APPLICATION)
@BypassInterceptors
@Install(precedence=0)
@Name(value="org.jboss.seam.core.expressions")
public class Expressions
extends Object
implements Serializable

Factory for EL method and value expressions. This default implementation uses JBoss EL.

Author:

Gavin King

See Also:

Serialized Form

Nested Class Summary

static interface	Expressions.MethodExpression<T> A method expression - an EL expression that evaluates to a method.
static interface	Expressions.ValueExpression<T> A value expression - an EL expression that evaluates to an attribute getter or get/set pair.

Constructor Summary

Expressions()

Method Summary

Expressions.MethodExpression<Object>	createMethodExpression(String expression) Create a method expression.
<T> Expressions.MethodExpression<T>	createMethodExpression(String expression, Class<T> type, Class... argTypes) Create a method expression.
Expressions.ValueExpression<Object>	createValueExpression(String expression) Create a value expression.
<T> Expressions.ValueExpression<T>	createValueExpression(String expression, Class<T> type) Create a value expression.
javax.el.ELContext	getELContext() Get an appropriate ELContext.
javax.el.ExpressionFactory	getExpressionFactory() Get the JBoss EL ExpressionFactory
static Expressions	instance()
protected boolean	isFacesContextActive()

Methods inherited from class java.lang.Object

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

Constructor Detail

Expressions

public Expressions()

Method Detail

getExpressionFactory

public javax.el.ExpressionFactory getExpressionFactory()

Get the JBoss EL ExpressionFactory

getELContext

public javax.el.ELContext getELContext()

Get an appropriate ELContext. If there is an active JSF request, use JSF's ELContext. Otherwise, use one that we create.

createValueExpression

public Expressions.ValueExpression<Object> createValueExpression(String expression)

Create a value expression.

Parameters:

expression - a JBoss EL value expression

createMethodExpression

public Expressions.MethodExpression<Object> createMethodExpression(String expression)

Create a method expression.

Parameters:

expression - a JBoss EL method expression

createValueExpression

public <T> Expressions.ValueExpression<T> createValueExpression(String expression,
                                                                Class<T> type)

Create a value expression.

Parameters:

expression - a JBoss EL value expression

type - the type of the value

createMethodExpression

public <T> Expressions.MethodExpression<T> createMethodExpression(String expression,
                                                                  Class<T> type,
                                                                  Class... argTypes)

Create a method expression.

Parameters:

expression - a JBoss EL method expression

type - the method return type

argTypes - the method parameter types

isFacesContextActive

protected boolean isFacesContextActive()

instance

public static Expressions instance()