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package com.sun.faces.application.annotation;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import javax.el.ValueExpression;
import javax.faces.application.ResourceDependency;
import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import com.sun.faces.el.ELUtils;
import com.sun.faces.util.RequestStateManager;
/**
* {@link RuntimeAnnotationHandler} responsible for processing {@link ResourceDependency} annotations.
*/
class ResourceDependencyHandler implements RuntimeAnnotationHandler {
private ResourceDependency[] dependencies;
private Map expressionsMap;
// ------------------------------------------------------------ Constructors
public ResourceDependencyHandler(ResourceDependency[] dependencies) {
this.dependencies = dependencies;
Map attrs = FacesContext.getCurrentInstance().getAttributes();
expressionsMap = new HashMap(dependencies.length, 1.0f);
for (ResourceDependency dep : dependencies) {
Expressions exprs = new Expressions();
exprs.name = dep.name();
String lib = dep.library();
if (lib.length() > 0) {
// Take special action to resolve the "this" library name
if ("this".equals(lib)) {
String thisLibrary = (String)
attrs.get(com.sun.faces.application.ApplicationImpl.THIS_LIBRARY);
assert(null != thisLibrary);
lib = thisLibrary;
}
exprs.library = lib;
}
String tgt = dep.target();
if (tgt.length() > 0) {
exprs.target = tgt;
}
expressionsMap.put(dep, exprs);
}
}
// ----------------------------------- Methods from RuntimeAnnotationHandler
@SuppressWarnings({"UnusedDeclaration"})
public void apply(FacesContext ctx, Object... params) {
for (ResourceDependency dep : dependencies) {
if (!hasBeenProcessed(ctx, dep)) {
pushResourceToRoot(ctx, createComponentResource(ctx, dep));
markProcssed(ctx, dep);
}
}
}
// --------------------------------------------------------- Private Methods
/**
* Adds the specified {@link UIComponent} as a component resource to the
* {@link javax.faces.component.UIViewRoot}
* @param ctx the {@link FacesContext} for the current request
* @param c the component resource
*/
private void pushResourceToRoot(FacesContext ctx, UIComponent c) {
ctx.getViewRoot().addComponentResource(ctx, c, (String) c .getAttributes().get("target"));
}
/**
* Determines of the specified {@link ResourceDependency} has already been
* previously processed.
*
* @param ctx the {@link FacesContext} for the current request
* @param dep the {@link ResourceDependency} in question
* @return true if the {@link ResourceDependency} has been
* processed, otherwise false
*/
@SuppressWarnings({"unchecked"})
private boolean hasBeenProcessed(FacesContext ctx, ResourceDependency dep) {
Set dependencies = (Set)
RequestStateManager.get(ctx, RequestStateManager.PROCESSED_RESOURCE_DEPENDENCIES);
return ((dependencies != null) && dependencies.contains(dep));
}
/**
* Construct a new component resource based off the provided {@link ValueExpression}s.
*
* @param ctx the {@link FacesContext} for the current request
* @param dep the ResourceDependency that the component resource will be
* constructed from
* @return a new component resource based of the provided annotation
*/
private UIComponent createComponentResource(FacesContext ctx, ResourceDependency dep) {
Expressions exprs = expressionsMap.get(dep);
Application app = ctx.getApplication();
String resname = exprs.getName(ctx);
UIComponent c = ctx.getApplication().createComponent("javax.faces.Output");
c.setRendererType(app.getResourceHandler().getRendererTypeForResourceName(resname));
Map attrs = c.getAttributes();
attrs.put("name", resname);
if (exprs.library != null) {
attrs.put("library", exprs.getLibrary(ctx));
}
if (exprs.target != null) {
attrs.put("target", exprs.getTarget(ctx));
}
return c;
}
/**
* Indicates that the specified ResourceDependency has been processed.
* @param ctx the {@link FacesContext} for the current request
* @param dep the {@link ResourceDependency}
*/
@SuppressWarnings({"unchecked"})
private void markProcssed(FacesContext ctx, ResourceDependency dep) {
Set dependencies = (Set)
RequestStateManager.get(ctx, RequestStateManager.PROCESSED_RESOURCE_DEPENDENCIES);
if (dependencies == null) {
dependencies = new HashSet(6);
RequestStateManager.set(ctx, RequestStateManager.PROCESSED_RESOURCE_DEPENDENCIES, dependencies);
}
dependencies.add(dep);
}
// ----------------------------------------------------------- Inner Classes
/**
* This helper class hides expression evaluation complexity.
*/
private static final class Expressions {
ValueExpression nameExpression;
ValueExpression libraryExpression;
ValueExpression targetExpression;
String name;
String library;
String target;
String getName(FacesContext ctx) {
if (nameExpression == null) {
nameExpression = ELUtils.createValueExpression(name, String.class);
}
return (String) nameExpression.getValue(ctx.getELContext());
}
String getLibrary(FacesContext ctx) {
if (library != null) {
if (libraryExpression == null) {
libraryExpression = ELUtils.createValueExpression(library, String.class);
}
return (String) libraryExpression.getValue(ctx.getELContext());
}
return null;
}
String getTarget(FacesContext ctx) {
if (target != null) {
if (targetExpression == null) {
targetExpression = ELUtils.createValueExpression(target, String.class);
}
return (String) targetExpression.getValue(ctx.getELContext());
}
return null;
}
}
}
