it.haefelinger.flaka.el
Class Resolver

java.lang.Object
  javax.el.ELResolver
      it.haefelinger.flaka.el.Resolver

public class Resolver
extends ELResolver

The main resolver. This resolver handles top-level entities (like the implicit object project). If the base is not null however, then resolution will be delegated to an underlying composite resolver. A special resolver exists which handles the resolution on properties on a object of Ant related entities like Project, Task, Target etc. See .

Author:

geronimo

Nested Class Summary

static class	Resolver.Have
static class	Resolver.ProjectWrapper
static interface	Resolver.Wrapper

Field Summary

protected boolean	debug
protected ELResolver	delegate
protected Project	project

Fields inherited from class javax.el.ELResolver

RESOLVABLE_AT_DESIGN_TIME, TYPE

Constructor Summary

Resolver(Project project)

Method Summary

Class<?>	getCommonPropertyType(ELContext context, Object base)
boolean	getDebug()
Iterator<FeatureDescriptor>	getFeatureDescriptors(ELContext context, Object base)
Class<?>	getType(ELContext context, Object base, Object property)
Object	getValue(ELContext context, Object base, Object property) Resolve property on base as 'rvalue'.
boolean	isReadOnly(ELContext context, Object base, Object property)
protected Map<String,Object>	makemap()
static ELResolver	makeResolver(Project project)
Resolver	setDebug(boolean b)
void	setValue(ELContext context, Object base, Object property, Object value)

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected final ELResolver delegate

project

protected Project project

debug

protected boolean debug

Constructor Detail

Resolver

public Resolver(Project project)

Method Detail

makeResolver

public static ELResolver makeResolver(Project project)

setDebug

public Resolver setDebug(boolean b)

getDebug

public boolean getDebug()

makemap

protected Map<String,Object> makemap()

getCommonPropertyType

public Class<?> getCommonPropertyType(ELContext context,
                                      Object base)

Specified by:

getCommonPropertyType in class ELResolver

getFeatureDescriptors

public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
                                                         Object base)

Specified by:

getFeatureDescriptors in class ELResolver

getType

public Class<?> getType(ELContext context,
                        Object base,
                        Object property)
                 throws NullPointerException,
                        PropertyNotFoundException,
                        ELException

Specified by:

getType in class ELResolver

Throws:

NullPointerException

PropertyNotFoundException

ELException

getValue

public Object getValue(ELContext context,
                       Object base,
                       Object property)
                throws NullPointerException,
                       PropertyNotFoundException,
                       ELException

Resolve property on base as 'rvalue'. It is from extreme importance that no exception is thrown here. Rather null shall be reported back (and a additional log message might be created). Otherwise if a exception is thrown here, evaluation of a larger context will be aborted. Take for example a context where three references like

 My name is #{..} is one of the #{..} recognizable opening #{..} in American
 

Clearly, we want to have as much references as possible evaluated. If one reference fails, we rather accept that there is something missing than giving up on all. Giving up on all references is exactly what will happen if a exception will be thrown by this method. Therefore make sure that everything is wrapped by a well defined exception handler.

Specified by:

getValue in class ELResolver

Throws:

NullPointerException

PropertyNotFoundException

ELException

isReadOnly

public boolean isReadOnly(ELContext context,
                          Object base,
                          Object property)
                   throws NullPointerException,
                          PropertyNotFoundException,
                          ELException

Specified by:

isReadOnly in class ELResolver

Throws:

NullPointerException

PropertyNotFoundException

ELException

setValue

public void setValue(ELContext context,
                     Object base,
                     Object property,
                     Object value)
              throws NullPointerException,
                     PropertyNotFoundException,
                     PropertyNotWritableException,
                     ELException

Specified by:

setValue in class ELResolver

Throws:

NullPointerException

PropertyNotFoundException

PropertyNotWritableException

ELException