/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.com/cddl/
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.sun.facelets.impl;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import com.sun.facelets.Facelet;
import com.sun.facelets.FaceletException;
import com.sun.facelets.FaceletFactory;
import com.sun.facelets.FaceletHandler;
import com.sun.facelets.compiler.Compiler;
import com.sun.facelets.util.ParameterCheck;
import com.sun.facelets.util.Resource;
/**
* Default FaceletFactory implementation.
*
* @author Jacob Hookom
* @version $Id: DefaultFaceletFactory.java,v 1.10 2007/04/09 01:13:17 youngm
* Exp $
*/
public final class DefaultFaceletFactory extends FaceletFactory {
protected final static Logger log = Logger.getLogger("facelets.factory");
private final Compiler compiler;
private Map facelets;
private Map relativeLocations;
private final ResourceResolver resolver;
private final URL baseUrl;
private final long refreshPeriod;
public DefaultFaceletFactory(Compiler compiler, ResourceResolver resolver)
throws IOException {
this(compiler, resolver, -1);
}
public DefaultFaceletFactory(Compiler compiler, ResourceResolver resolver,
long refreshPeriod) {
ParameterCheck.notNull("compiler", compiler);
ParameterCheck.notNull("resolver", resolver);
this.compiler = compiler;
this.facelets = new HashMap();
this.relativeLocations = new HashMap();
this.resolver = resolver;
this.baseUrl = resolver.resolveUrl("/");
// this.location = url;
log.fine("Using ResourceResolver: " + resolver);
this.refreshPeriod = (refreshPeriod >= 0) ? refreshPeriod * 1000 : -1;
log.fine("Using Refresh Period: " + this.refreshPeriod);
}
/*
* (non-Javadoc)
*
* @see com.sun.facelets.FaceletFactory#getFacelet(java.lang.String)
*/
public Facelet getFacelet(String uri) throws IOException, FaceletException,
FacesException, ELException {
URL url = (URL) this.relativeLocations.get(uri);
if (url == null) {
url = this.resolveURL(this.baseUrl, uri);
if (url != null) {
Map newLoc = new HashMap(this.relativeLocations);
newLoc.put(uri, url);
this.relativeLocations = newLoc;
} else {
throw new IOException("'" + uri + "' not found.");
}
}
return this.getFacelet(url);
}
/**
* Resolves a path based on the passed URL. If the path starts with '/',
* then resolve the path against
* {@link javax.faces.context.ExternalContext#getResource(java.lang.String) javax.faces.context.ExternalContext#getResource(java.lang.String)}.
* Otherwise create a new URL via
* {@link URL#URL(java.net.URL, java.lang.String) URL(URL, String)}.
*
* @param source
* base to resolve from
* @param path
* relative path to the source
* @return resolved URL
* @throws IOException
*/
public URL resolveURL(URL source, String path) throws IOException {
if (path.startsWith("/")) {
URL url = this.resolver.resolveUrl(path);
if (url == null) {
throw new FileNotFoundException(path
+ " Not Found in ExternalContext as a Resource");
}
return url;
} else {
return new URL(source, path);
}
}
/**
* Create a Facelet from the passed URL. This method checks if the cached
* Facelet needs to be refreshed before returning. If so, uses the passed
* URL to build a new instance;
*
* @param url
* source url
* @return Facelet instance
* @throws IOException
* @throws FaceletException
* @throws FacesException
* @throws ELException
*/
public Facelet getFacelet(URL url) throws IOException, FaceletException,
FacesException, ELException {
ParameterCheck.notNull("url", url);
String key = url.toString();
DefaultFacelet f = (DefaultFacelet) this.facelets.get(key);
if (f == null || this.needsToBeRefreshed(f)) {
f = this.createFacelet(url);
if (this.refreshPeriod != 0) {
Map newLoc = new HashMap(this.facelets);
newLoc.put(key, f);
this.facelets = newLoc;
}
}
return f;
}
/**
* Template method for determining if the Facelet needs to be refreshed.
*
* @param facelet
* Facelet that could have expired
* @return true if it needs to be refreshed
*/
protected boolean needsToBeRefreshed(DefaultFacelet facelet) {
// if set to 0, constantly reload-- nocache
if (this.refreshPeriod == 0)
return true;
// if set to -1, never reload
if (this.refreshPeriod == -1)
return false;
long ttl = facelet.getCreateTime() + this.refreshPeriod;
URL url = facelet.getSource();
InputStream is = null;
if (System.currentTimeMillis() > ttl) {
try {
URLConnection conn = url.openConnection();
is = conn.getInputStream();
long atl = conn.getLastModified();
return atl == 0 || atl > ttl;
} catch (Exception e) {
throw new FaceletException("Error Checking Last Modified for "
+ facelet.getAlias(), e);
} finally {
if (is != null) {
try {
is.close();
} catch (Exception e) {
// do nothing
}
}
}
}
return false;
}
/**
* Uses the internal Compiler reference to build a Facelet given the passed
* URL.
*
* @param url
* source
* @return a Facelet instance
* @throws IOException
* @throws FaceletException
* @throws FacesException
* @throws ELException
*/
private DefaultFacelet createFacelet(URL url) throws IOException,
FaceletException, FacesException, ELException {
if (log.isLoggable(Level.FINE)) {
log.fine("Creating Facelet for: " + url);
}
String alias = "/"
+ url.getFile().replaceFirst(this.baseUrl.getFile(), "");
try {
FaceletHandler h = this.compiler.compile(url, alias);
DefaultFacelet f = new DefaultFacelet(this, this.compiler
.createExpressionFactory(), url, alias, h);
return f;
} catch (FileNotFoundException fnfe) {
if (log.isLoggable(Level.WARNING)) {
log.warning(alias + " not found at " + url.toExternalForm());
}
throw new FileNotFoundException("Facelet Not Found: "
+ url.toExternalForm());
}
}
/**
* Compiler this factory uses
*
* @return final Compiler instance
*/
public Compiler getCompiler() {
return this.compiler;
}
public long getRefreshPeriod() {
return refreshPeriod;
}
}