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package javax.faces.view.facelets;
import java.io.IOException;
import java.net.URL;
/**
* This API defines the facility by which
* the Facelets {@link javax.faces.view.ViewDeclarationLanguage}
* creates and caches instances of Facelets.
* The cache handles two different kinds of
* Facelets: View Facelets and View Metadata Facelets. The former is
* the usual Facelet that provides for the construction of a
* UIComponent tree. This kind of Facelet is accessed via
* the {@link #getFacelet} and {@link #isFaceletCached} methods. The
* latter is a special kind of Facelet that corresponds to {@link
* javax.faces.view.ViewDeclarationLanguage#getViewMetadata}. This kind
* of Facelet is accessed via the {@link #getViewMetadataFacelet} and
* {@link #isViewMetadataFaceletCached} methods.
* @since 2.1
*/
public abstract class FaceletCache {
/**
* Factory interface for creating
* Facelet or View Metadata Facelet instances.
*/
public interface MemberFactory {
/**
* Create a Facelet or View
* Metadata Facelet (depending on the type of factory this is)
* for the argument URL.
* @param key the URL that will be used as the key
* for the instance being created.
*
* @throws NullPointerException if argument key is
* null.
*/
public V newInstance(final URL key) throws IOException;
}
/**
* Returns a cached Facelet
* instance. If no instance is available, it will be created using
* the Facelet {@link MemberFactory} and stored in the cache.
* @param url URL for the Facelet being retrieved
*
* @throws NullPointerException if argument url is
* null.
*/
public abstract V getFacelet(URL url) throws IOException;
/**
* Determines whether a cached Facelet
* instance exists for this URL. Returns true if a cached instance
* exists, false otherwise
* @param url URL for the Facelet
* @throws NullPointerException if argument url is
* null.
*/
public abstract boolean isFaceletCached(URL url);
/**
* Returns a cached View Metadata
* Facelet instance. If no instance is available, it will be created
* using the View Metadata Facelet {@link MemberFactory} and stored
* in the cache.
* @param url URL for the View Metadata Facelet being
* retrieved
* @throws NullPointerException if argument url is
* null.
*/
public abstract V getViewMetadataFacelet(URL url) throws IOException;
/**
* Determines whether a cached View
* Metadata Facelet instance exists for this URL. Returns true if a
* cached instance exists, false otherwise
* @param url URL for the View Metadata Facelet
* @throws NullPointerException if argument url is
* null.
*/
public abstract boolean isViewMetadataFaceletCached(URL url);
/**
* This must be called by the runtime
* at startup time, before any requests are serviced, and allows for
* the FaceletCache implementation to provide the
* {@link MemberFactory} instances that will be used to create
* instances of Facelets and View Metadata Facelets.
*
* @param faceletFactory the {@link MemberFactory} instance that
* will be used to create instances of Facelets.
* @param viewMetadataFaceletFactory the {@link MemberFactory}
* instance that will be used to create instances of metadata
* Facelets.
* @throws NullPointerException if either argument is null
*/
protected void setMemberFactories(MemberFactory faceletFactory,
MemberFactory viewMetadataFaceletFactory) {
if (null == faceletFactory || null == viewMetadataFaceletFactory) {
throw new NullPointerException("Neither faceletFactory no viewMetadataFaceletFactory may be null.");
}
this.memberFactory = faceletFactory;
this.viewMetadataMemberFactory = viewMetadataFaceletFactory;
}
private MemberFactory memberFactory;
private MemberFactory viewMetadataMemberFactory;
/**
* Returns the {@link MemberFactory}
* passed to {@link #setMemberFactories} for the purpose of creating
* Facelet instance.
*/
protected MemberFactory getMemberFactory() {
return memberFactory;
}
/**
* Returns the {@link MemberFactory}
* passed to {@link #setMemberFactories} for the purpose of creating
* View Metadata Facelet instance.
*/
protected MemberFactory getMetadataMemberFactory() {
return viewMetadataMemberFactory;
}
}