Package org.apache.jasper.runtime

Class JspApplicationContextImpl

java.lang.Object

org.apache.jasper.runtime.JspApplicationContextImpl

All Implemented Interfaces:

JspApplicationContext

public class JspApplicationContextImpl
extends java.lang.Object
implements JspApplicationContext

Field Summary

Fields

Modifier and Type	Field	Description
private javax.servlet.ServletContext	context
private java.util.ArrayList<javax.el.ELResolver>	elResolvers
private javax.el.ExpressionFactory	expressionFactory
private java.util.ArrayList<javax.el.ELContextListener>	listeners
private static java.util.Map<javax.servlet.ServletContext,JspApplicationContextImpl>	map

Constructor Summary

Constructors

Constructor	Description
JspApplicationContextImpl(javax.servlet.ServletContext context)

Method Summary

Modifier and Type	Method	Description
void	addELContextListener(javax.el.ELContextListener listener)	Registers a ELContextListeners so that context objects can be added whenever a new ELContext is created.
void	addELResolver(javax.el.ELResolver resolver)	Adds an ELResolver to affect the way EL variables and properties are resolved for EL expressions appearing in JSP pages and tag files.
protected javax.el.ELContext	createELContext(javax.el.ELResolver resolver)
protected static JspApplicationContextImpl	findJspApplicationContext(javax.servlet.ServletContext context)
protected java.util.Iterator<javax.el.ELResolver>	getELResolvers()
javax.el.ExpressionFactory	getExpressionFactory()	Returns a factory used to create ValueExpressions and MethodExpressions so that EL expressions can be parsed and evaluated.
static void	removeJspApplicationContext(javax.servlet.ServletContext context)
void	setExpressionFactory(javax.el.ExpressionFactory expressionFactory)

Methods inherited from class java.lang.Object

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

Field Detail

map

private static java.util.Map<javax.servlet.ServletContext,JspApplicationContextImpl> map

elResolvers

private java.util.ArrayList<javax.el.ELResolver> elResolvers

listeners

private java.util.ArrayList<javax.el.ELContextListener> listeners

context

private javax.servlet.ServletContext context

expressionFactory

private javax.el.ExpressionFactory expressionFactory

Constructor Detail

JspApplicationContextImpl

public JspApplicationContextImpl(javax.servlet.ServletContext context)

Method Detail

addELResolver

public void addELResolver(javax.el.ELResolver resolver)

Description copied from interface: JspApplicationContext

Adds an ELResolver to affect the way EL variables and properties are resolved for EL expressions appearing in JSP pages and tag files.

For example, in the EL expression ${employee.lastName}, an ELResolver determines what object "employee" references and how to find its "lastName" property.

When evaluating an expression, the JSP container will consult a set of standard resolvers as well as any resolvers registered via this method. The set of resolvers are consulted in the following order:

• ImplicitObjectELResolver
• ELResolvers registered via this method, in the order in which they are registered.
• MapELResolver
• ListELResolver
• ArrayELResolver
• BeanELResolver
• ScopedAttributeELResolver

It is illegal to register an ELResolver after the application has received any request from the client. If an attempt is made to register an ELResolver after that time, an IllegalStateException is thrown.

This restriction is in place to allow the JSP container to optimize for the common case where no additional ELResolvers are in the chain, aside from the standard ones. It is permissible to add ELResolvers before or after initialization to a CompositeELResolver that is already in the chain.

It is not possible to remove an ELResolver registered with this method, once it has been registered.

Specified by:

addELResolver in interface JspApplicationContext

Parameters:

resolver - The new ELResolver

getExpressionFactory

public javax.el.ExpressionFactory getExpressionFactory()

Description copied from interface: JspApplicationContext

Returns a factory used to create ValueExpressions and MethodExpressions so that EL expressions can be parsed and evaluated.

Specified by:

getExpressionFactory in interface JspApplicationContext

Returns:

A concrete implementation of the an ExpressionFactory.

setExpressionFactory

public void setExpressionFactory(javax.el.ExpressionFactory expressionFactory)

addELContextListener

public void addELContextListener(javax.el.ELContextListener listener)

Description copied from interface: JspApplicationContext

Registers a ELContextListeners so that context objects can be added whenever a new ELContext is created.

At a minimum, the ELContext objects created will contain a reference to the JspContext for this request, which is added by the JSP container. This is sufficient for all the default ELResolvers listed in JspApplicationContext.addELResolver(javax.el.ELResolver). Note that JspContext.class is used as the key to ELContext.putContext() for the JspContext object reference.

This method is generally used by frameworks and applications that register their own ELResolver that needs context other than JspContext. The listener will typically add the necessary context to the ELContext provided in the event object. Registering a listener that adds context allows the ELResolvers in the stack to access the context they need when they do a resolution.

Specified by:

addELContextListener in interface JspApplicationContext

Parameters:

listener - The listener to be notified when a new ELContext is created.

createELContext

protected javax.el.ELContext createELContext(javax.el.ELResolver resolver)

findJspApplicationContext

protected static JspApplicationContextImpl findJspApplicationContext(javax.servlet.ServletContext context)

removeJspApplicationContext

public static void removeJspApplicationContext(javax.servlet.ServletContext context)

getELResolvers

protected java.util.Iterator<javax.el.ELResolver> getELResolvers()