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*
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package com.sun.faces.el;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.el.PropertyNotFoundException;
import javax.faces.application.Resource;
import javax.faces.application.ResourceHandler;
import javax.faces.context.FacesContext;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;
import javax.faces.component.UIComponent;
/**
* ELResolver to resolve expressions like the following:
*
*
#{resource['library:resource']}
*
#{resource['resource']}
*
*/
public class ResourceELResolver extends ELResolver {
// ------------------------------------------------- Methods from ELResolver
/**
* If base and property are not null and base is
* an instance of {@link ResourceHandler}, perform the following:
*
*
* If property doesn't contain : treat property
* as the resource name and pass property to {@link ResourceHandler#createResource(String)}
*
*
* If property contains a single : treat the content
* before the : as the library name, and the content after the
* : to be the resource name and pass both to {@link javax.faces.application.ResourceHandler#createResource(String, String)}
*
*
* If property contains more than one : then throw
* a ELException
*
*
* If one of the above steps resulted in the creation of a {@link Resource}
* instance, call ELContext.setPropertyResolved(true) and return
* the result of {@link javax.faces.application.Resource#getRequestPath()}
*
*
* @see ELResolver#getValue(javax.el.ELContext, Object, Object)
*/
public Object getValue(ELContext context, Object base, Object property) {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
Object ret = null;
if (base instanceof ResourceHandler) {
ResourceHandler handler = (ResourceHandler) base;
String prop = property.toString();
Resource res;
if (!prop.contains(":")) {
res = handler.createResource(prop);
} else {
if (!isPropertyValid(prop)) {
// RELEASE_PENDING i18n
throw new ELException("Invalid resource format. Property " + prop + " contains more than one colon (:)");
}
String[] parts = Util.split(prop, ":");
// If the enclosing entity for this expression is itself
// a resource, the "this" syntax for the library name must
// be supported.
if (null != parts[0] && parts[0].equals("this")) {
FacesContext facesContext = FacesContext.getCurrentInstance();
UIComponent currentComponent = UIComponent.getCurrentCompositeComponent(facesContext);
Resource componentResource = (Resource)
currentComponent.getAttributes().get(Resource.COMPONENT_RESOURCE_KEY);
if (null != componentResource) {
String libName = null;
if (null != (libName = componentResource.getLibraryName())) {
parts[0] = libName;
}
}
}
res = handler.createResource(parts[1], parts[0]);
}
if (res != null) {
ret = res.getRequestPath();
}
context.setPropertyResolved(true);
}
return ret;
}
/**
* @return null as this resolver only performs lookups
* @throws PropertyNotFoundException if base and property are null
*/
public Class getType(ELContext context, Object base, Object property) {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
return null;
}
/**
* This is basically a no-op.
* @throws PropertyNotFoundException if base and property are null
*/
public void setValue(ELContext context,
Object base,
Object property,
Object value) {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
}
/**
* @return false (basically ignored by the EL system)
* @throws PropertyNotFoundException if base and property are null
*/
public boolean isReadOnly(ELContext context, Object base, Object property) {
if (base == null && property == null) {
String message = MessageUtils.getExceptionMessageString
(MessageUtils.NULL_PARAMETERS_ERROR_MESSAGE_ID, "base and property"); // ?????
throw new PropertyNotFoundException(message);
}
return false;
}
/**
* @return null - there is no way to query the
* ResourceManager for all known resources
*/
public Iterator getFeatureDescriptors(ELContext context,
Object base) {
return null;
}
/**
* @return String.class - getType() expects String properties
*/
public Class getCommonPropertyType(ELContext context, Object base) {
return String.class;
}
// --------------------------------------------------------- Private Methods
private boolean isPropertyValid(String property) {
int idx = property.indexOf(':');
return (property.indexOf(':', idx + 1) == -1);
}
}
