com.jwebmp.guicedservlets.jsf.GuiceELResolverWrapper Maven / Gradle / Ivy
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package com.jwebmp.guicedservlets.jsf;
import com.google.inject.Injector;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.faces.FacesWrapper;
import javax.faces.context.FacesContext;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.Map;
/**
* A {@link FacesWrapper} implementation that wraps an {@link ELResolver} and
* provides a mechanism to inject Guice {@link Injector} implementations.
*
* @author John Yeary
* @version 1.0
*/
public class GuiceELResolverWrapper
extends ELResolver
implements FacesWrapper
{
private ELResolver wrapped;
/**
* Default constructor.
*/
public GuiceELResolverWrapper()
{
}
/**
* Constructor that wraps an {@link ELResolver}.
*
* @param wrapped
* The resolver to wrap;
*/
public GuiceELResolverWrapper(ELResolver wrapped)
{
this.wrapped = wrapped;
}
/**
* {@inheritDoc}
*
* Note: This implementation checks to see if the property
* can be resolved using the wrapped instance. If the property is resolved,
* this method will inject the Guice {@link Injector} implementations.
*/
@Override
public Object getValue(ELContext context, Object base, Object property)
{
Object obj = getWrapped().getValue(context, base, property);
if (null != obj)
{
FacesContext fctx = (FacesContext) context.getContext(FacesContext.class);
if (null != fctx)
{
Map map = fctx.getExternalContext()
.getApplicationMap();
Injector injector = (Injector) map.get(Injector.class.getName());
if (injector == null)
{
throw new NullPointerException("Could not locate "
+ "Guice Injector in application scope using"
+ " key '" + Injector.class.getName() + "'");
}
injector.injectMembers(obj);
}
}
return obj;
}
/**
* {@inheritDoc}
*/
@Override
public ELResolver getWrapped()
{
return wrapped;
}
/**
* {@inheritDoc}
*
* Note: This returns the wrapped implementation.
*/
@Override
public Class getType(ELContext context, Object base, Object property)
{
return getWrapped().getType(context, base, property);
}
/**
* {@inheritDoc}
*
* Note: This returns the wrapped implementation.
*/
@Override
public void setValue(ELContext context, Object base, Object property, Object value)
{
getWrapped().setValue(context, base, property, value);
}
/**
* {@inheritDoc}
*
* Note: This returns the wrapped implementation.
*/
@Override
public boolean isReadOnly(ELContext context, Object base, Object property)
{
return getWrapped().isReadOnly(context, base, property);
}
/**
* {@inheritDoc}
*
* Note: This returns the wrapped implementation.
*/
@Override
public Iterator getFeatureDescriptors(ELContext context, Object base)
{
return getWrapped().getFeatureDescriptors(context, base);
}
/**
* {@inheritDoc}
*
* Note: This returns the wrapped implementation.
*/
@Override
public Class getCommonPropertyType(ELContext context, Object base)
{
return getWrapped().getCommonPropertyType(context, base);
}
}