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package com.sun.faces.application.resource;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.faces.application.ProjectStage;
import javax.faces.context.FacesContext;
import com.sun.faces.config.WebConfiguration;
import com.sun.faces.util.Util;
import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.CacheResourceModificationTimestamp;
import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.EnableMissingResourceLibraryDetection;
/**
* <p>
* A {@link ResourceHelper} implementation for finding/serving resources
* found on the classpath within the <code>META-INF/resources directory.
* </p>
*
* @since 2.0
*/
public class ClasspathResourceHelper extends ResourceHelper {
private static final String BASE_RESOURCE_PATH = "META-INF/resources";
private boolean cacheTimestamp;
private volatile ZipDirectoryEntryScanner libraryScanner;
private boolean enableMissingResourceLibraryDetection;
// ------------------------------------------------------------ Constructors
public ClasspathResourceHelper() {
WebConfiguration webconfig = WebConfiguration.getInstance();
cacheTimestamp = webconfig.isOptionEnabled(CacheResourceModificationTimestamp);
enableMissingResourceLibraryDetection =
webconfig.isOptionEnabled(EnableMissingResourceLibraryDetection);
}
// --------------------------------------------- Methods from ResourceHelper
/**
* @see com.sun.faces.application.resource.ResourceHelper#getBaseResourcePath()
*/
public String getBaseResourcePath() {
return BASE_RESOURCE_PATH;
}
/**
* @see ResourceHelper#getNonCompressedInputStream(ResourceInfo, javax.faces.context.FacesContext)
*/
protected InputStream getNonCompressedInputStream(ResourceInfo resource, FacesContext ctx)
throws IOException {
ClassLoader loader = Util.getCurrentLoader(this.getClass());
String path = resource.getPath();
InputStream in = loader.getResourceAsStream(path);
if (in == null) {
// try using this class' loader (necessary when running in OSGi)
in = this.getClass().getClassLoader().getResourceAsStream(path);
}
return in;
}
/**
* @see com.sun.faces.application.resource.ResourceHelper#getURL(ResourceInfo, javax.faces.context.FacesContext)
*/
public URL getURL(ResourceInfo resource, FacesContext ctx) {
ClassLoader loader = Util.getCurrentLoader(this.getClass());
URL url = loader.getResource(resource.getPath());
if (url == null) {
// try using this class' loader (necessary when running in OSGi)
url = this.getClass().getClassLoader().getResource(resource.getPath());
}
return url;
}
/**
* @see ResourceHelper#findLibrary(String, String, javax.faces.context.FacesContext)
*/
public LibraryInfo findLibrary(String libraryName,
String localePrefix,
FacesContext ctx) {
ClassLoader loader = Util.getCurrentLoader(this);
String basePath;
if (localePrefix == null) {
basePath = getBaseResourcePath() + '/' + libraryName + '/';
} else {
basePath = getBaseResourcePath()
+ '/'
+ localePrefix
+ '/'
+ libraryName
+ '/';
}
URL basePathURL = loader.getResource(basePath);
if (basePathURL == null) {
// try using this class' loader (necessary when running in OSGi)
basePathURL = this.getClass().getClassLoader().getResource(basePath);
if (basePathURL == null) {
return null;
}
}
return new LibraryInfo(libraryName, null, localePrefix, this);
}
public LibraryInfo findLibraryWithZipDirectoryEntryScan(String libraryName,
String localePrefix,
FacesContext ctx, boolean forceScan) {
ClassLoader loader = Util.getCurrentLoader(this);
String basePath;
if (localePrefix == null) {
basePath = getBaseResourcePath() + '/' + libraryName + '/';
} else {
basePath = getBaseResourcePath()
+ '/'
+ localePrefix
+ '/'
+ libraryName
+ '/';
}
URL basePathURL = loader.getResource(basePath);
if (basePathURL == null) {
// try using this class' loader (necessary when running in OSGi)
basePathURL = this.getClass().getClassLoader().getResource(basePath);
if (basePathURL == null) {
if (null != localePrefix && libraryName.equals("javax.faces")) {
return null;
}
if (enableMissingResourceLibraryDetection || forceScan) {
if (null == libraryScanner) {
libraryScanner = new ZipDirectoryEntryScanner();
}
if (!libraryScanner.libraryExists(libraryName, localePrefix)) {
return null;
}
}
}
}
return new LibraryInfo(libraryName, null, localePrefix, this);
}
/**
* @see ResourceHelper#findResource(LibraryInfo, String, String, boolean, javax.faces.context.FacesContext)
*/
public ResourceInfo findResource(LibraryInfo library,
String resourceName,
String localePrefix,
boolean compressable,
FacesContext ctx) {
ClassLoader loader = Util.getCurrentLoader(this);
String basePath;
if (library != null) {
basePath = library.getPath() + '/' + resourceName;
} else {
if (localePrefix == null) {
basePath = getBaseResourcePath() + '/' + resourceName;
} else {
basePath = getBaseResourcePath()
+ '/'
+ localePrefix
+ '/'
+ resourceName;
}
}
URL basePathURL = loader.getResource(basePath);
if (basePathURL == null) {
// try using this class' loader (necessary when running in OSGi)
basePathURL = this.getClass().getClassLoader().getResource(basePath);
if (basePathURL == null) {
return null;
}
}
ResourceInfo value;
if (library != null) {
value = new ResourceInfo(library,
resourceName,
null,
compressable,
resourceSupportsEL(resourceName, ctx),
ctx.isProjectStage(ProjectStage.Development),
cacheTimestamp);
} else {
value = new ResourceInfo(resourceName,
null,
localePrefix,
this,
compressable,
resourceSupportsEL(resourceName, ctx),
ctx.isProjectStage(ProjectStage.Development),
cacheTimestamp);
}
if (value.isCompressable()) {
value = handleCompression(value);
}
return value;
}
}