com.sun.jsftemplating.util.FileUtil Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the license at
* https://jsftemplating.dev.java.net/cddl1.html or
* jsftemplating/cddl1.txt.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* Header Notice in each file and include the License file
* at jsftemplating/cddl1.txt.
* If applicable, add the following below the CDDL Header,
* with the fields enclosed by brackets [] replaced by
* you own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
*/
package com.sun.jsftemplating.util;
import com.sun.jsftemplating.layout.LayoutDefinitionException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
/**
* This class is for general purpose utility methods.
*
* @author Ken Paulsen ([email protected])
*/
public class FileUtil {
/**
* This method calculates the system path to the given filename that
* is relative to the docroot. It takes the
* ServletContext or PortletContext (which
* is why this method takes an Object for this parameter)
* and the relative path to find. It then invokes the
* getRealPath(String) method of the
* ServletContext / PortletContext and
* returns the result. This method uses reflection.
*/
public static String getRealPath(Object ctx, String relativePath) {
String path = null;
// The following should work w/ a ServletContext or PortletContext
Method method = null;
try {
method = ctx.getClass().getMethod("getRealPath", REALPATH_ARGS);
} catch (NoSuchMethodException ex) {
throw new RuntimeException(ex);
}
try {
path = (String) method.invoke(ctx, new Object [] {relativePath});
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex);
} catch (InvocationTargetException ex) {
throw new RuntimeException(ex);
}
// Return Result
return path;
}
/**
* This method checks for the relPath in the docroot of
* the application. This should work in both Portlet and Servlet
* environments. If FacesContext is null, null will be
* returned.
*/
public static URL getResource(String relPath) {
FacesContext facesContext = FacesContext.getCurrentInstance();
if (facesContext == null) {
return null;
}
Object ctx = facesContext.getExternalContext().getContext();
URL url = null;
// The following should work w/ a ServletContext or PortletContext
Method method = null;
try {
method = ctx.getClass().getMethod(
"getResource", GET_RES_ARGS);
} catch (NoSuchMethodException ex) {
throw new LayoutDefinitionException("Unable to find "
+ "'getResource' method in this environment!", ex);
}
try {
url = (URL) method.invoke(ctx, new Object [] {"/" + relPath});
} catch (IllegalAccessException ex) {
throw new LayoutDefinitionException(ex);
} catch (InvocationTargetException ex) {
throw new LayoutDefinitionException(ex);
}
return url;
}
/**
* This method searches for the given relative path filename. It
* first looks relative the context root of the application, it then
* looks in the classpath, including relative to the
* META-INF folder. If found a URL to the
* file will be returned.
*
* @param path The Path.
*
* @param defSuff The suffix to use if the file specified in path is not
* found, it is sometimes useful to translate the path
* using a default suffix.
*/
public static URL searchForFile(String path, String defSuff) throws IOException {
// Remove leading '/' characters if needed
boolean absolutePath = false;
String newPath = path;
while (newPath.startsWith("/")) {
newPath = newPath.substring(1);
absolutePath = true;
}
// Check to see if we have already found this before (on this request)
URL url = null;
FacesContext ctx = FacesContext.getCurrentInstance();
Map filesFound = getFilesFoundMap(ctx);
if (filesFound != null) {
url = filesFound.get(newPath);
if (url != null) {
// We've already figured this out, abort before we start
return url;
}
}
// Next check relative newPath (i.e. determine the directory w/i the app
// they are in and prepend it to the newPath)
if (!absolutePath) {
// Check for URL syntax... at this point it will look like a relative
// path.
//
// NOTE: While this should not be exposed from the browser, it is
// valid for server-side code to request page fragments via URLs.
// If this is the case, "newPath" will be in the form:
// ://... We'll simply detect by checking for "://".
if (newPath.contains("://")) {
// Looks like a URL...
try {
// Read the contents
byte[] content = readFromURL(new URL(newPath));
// Use request scope in order to persist it appropriately...
// Not retrievied, prevents GC from happenning early
if (ctx != null) {
ctx.getExternalContext().getRequestMap().
put("__gf." + newPath, content);
}
// Use special URL which will buffer the contents
url = new URL(null, newPath, new CachedURLStreamHandler(content));
// Cache the URL...
if (filesFound != null) {
// Cache what we found -- each LDM calls this method, help them...
filesFound.put(newPath, url);
}
// We need to end early b/c this is a special case...
return url;
} catch (MalformedURLException ex) {
// This is probably bad, but we'll ignore it and see if
// it can be found via a relative path.
} catch (IOException ex) {
// Rethrow it b/c this error probably should be shown.
throw ex;
}
}
String absPath = getAbsolutePath(ctx, newPath);
url = searchForFile(absPath, defSuff);
// We're done, don't search anymore even if not found
return url;
}
// Check for file in docroot.
url = getResource(newPath);
if (url == null) {
// Check the classpath for the file
ClassLoader loader = Util.getClassLoader(path);
url = loader.getResource(newPath);
if (url == null) {
// Check w/ a leading '/'
url = loader.getResource("/" + newPath);
if (url == null) {
// Check in "META-INF/"
url = loader.getResource("META-INF/" + newPath);
if ((url == null) && (defSuff != null)) {
// Check to see if the extension is not .jsf, if
// not then try finding w/ the extension of .jsf
// This allows developers to write .jsf files and
// share them even if the FacesServlet is mapped
// differently
int idx = path.lastIndexOf('.');
if (idx != -1) {
String ext = path.substring(idx);
if (!ext.equalsIgnoreCase(defSuff)) {
return searchForFile(path.substring(0,
idx) + defSuff, null);
}
} else {
return searchForFile(path + defSuff, null);
}
}
}
}
}
if ((url != null) && (filesFound != null)) {
// Cache what we found -- each LDM calls this method, help them...
filesFound.put(newPath, url);
}
// Return a url to the file (hopefully)...
return url;
}
/**
* This method converts a path relative to the current viewId into an
* absolute path from the context-root. It does this by prepending
* the current viewId to it. It is expected that relPath does not
* contain a leading '/'.
*
* @param ctx The FacesContext.
* @param relPath The relative path to convert.
*
* @return The absolute path (relative to the context-root).
*/
public static String getAbsolutePath(FacesContext ctx, String relPath) {
// Sanity check
String absPath = null;
if (ctx != null) {
// Make sure we have a ViewRoot
UIViewRoot viewRoot = ctx.getViewRoot();
if (viewRoot != null) {
// Get the viewId
String viewId = viewRoot.getViewId();
if (viewId == null) {
viewId = "/";
} else if (!viewId.startsWith("/")) {
// Ensure our viewId starts with a '/'
viewId = "/" + viewId;
}
int slash = viewId.lastIndexOf('/');
// This will give our our base directory...
absPath = viewId.substring(0, ++slash);
// Append on the relative path
absPath += relPath;
}
}
return (absPath == null) ? ("/" + relPath) : absPath;
}
/**
* This method looks for "/./" or "/../" elements in an absolute path
* and removes them. If a "/./" is found, it simply removes it. If a
* "/../" is found, it removes it and the preceeding path element.
* This method also removes duplate '/' characters (i.e. "//" becomes
* "/").
*/
public static String cleanUpPath(String absPath) {
// First lets remove any "/./" elements
int idx;
while ((idx = absPath.indexOf("/./")) != -1) {
absPath = absPath.substring(0, idx) + absPath.substring(idx + 2);
}
// Next remove any "/../" elements
while ((idx = absPath.indexOf("/../")) != -1) {
int prevElement = 0;
if (idx > 0) {
// Find previous element
prevElement = absPath.lastIndexOf('/', idx - 1);
if (prevElement == -1) {
prevElement = 0;
}
}
absPath = absPath.substring(0, prevElement) + absPath.substring(idx + 3);
}
// Remove "//"
while ((idx = absPath.indexOf("//")) != -1) {
absPath = absPath.substring(0, idx) + absPath.substring(idx + 1);
}
// Return the fixed-up path
return absPath;
}
/**
* This method looks for resources in jar files without using the
* ClassLoader. It accepts directories in which it should scan for
* jar files.
*
* @param facesContext The FacesContext.
* @param resourcePath The resource name to search in all jar files.
* @param searchPaths The array of paths to search for jar files.
*/
public static List getJarResources(FacesContext facesContext, String resourcePath, String... searchPaths) throws IOException {
if (searchPaths == null) {
// Use default jar search path...
searchPaths = DEFAULT_SEARCH_PATH;
}
List entries = new ArrayList();
ExternalContext ec = facesContext.getExternalContext();
for (String searchPath : searchPaths) {
Set paths = ec.getResourcePaths(searchPath);
for (String path : paths) {
if ("jar".equalsIgnoreCase(path.substring(path.length() - 3))) {
// FIXME: Can this be a URL?
JarFile jarFile = new JarFile(new File(ec.getResource(path).getFile()));
JarEntry jarEntry = jarFile.getJarEntry(resourcePath);
if (jarEntry != null) {
entries.add(new Tuple(jarFile, jarEntry));
}
}
}
}
return entries;
}
/**
* This method read content from a URL and returns the
* result as a byte[].
*/
public static byte[] readFromURL(URL url) throws IOException {
byte buffer[] = new byte[10000];
byte result[] = new byte[0];
//try {
int count = 0;
int offset = 0;
InputStream in = url.openStream();
// Attempt to read up to 10K bytes.
count = in.read(buffer);
while (count != -1) {
// Make room for new content...
//result = Arrays.copyOf(result, offset + count); Java 6 only...
// When I can depend on Java 6... replace the following 3 lines
// with the line above.
byte oldResult[] = result;
result = new byte[offset + count];
System.arraycopy(oldResult, 0, result, 0, offset);
// Copy in new content...
System.arraycopy(buffer, 0, result, offset, count);
// Increment the offset
offset += count;
// Attempt to read up to 10K more bytes...
count = in.read(buffer);
}
//} catch (IOException ex) {
//throw new RuntimException("Error while trying to read from URL: " + url);
//}
return result;
}
/**
* This method provides access to a Map containing the URLs of files
* that have been found already on this particular request. This is
* done to speed up the task of locating the appropriate URL.
*
* The Map returned is keyed by the viewId (or String
* representation of the URL) for the file in question. If the
* given FacesContext is null,
* null will be returned from this method.
*/
private static Map getFilesFoundMap(FacesContext ctx) {
Map filesFound = null;
// Only do this caching if we're in Faces...
if (ctx != null) {
filesFound = (Map)
ctx.getExternalContext().getRequestMap().get(FILES_FOUND);
if (filesFound == null) {
// Not yet created, create it...
filesFound = new HashMap(8);
ctx.getExternalContext().getRequestMap().put(FILES_FOUND, filesFound);
}
}
return filesFound;
}
private static final String FILES_FOUND = "_filesFoundThisRequest";
private static final Class [] REALPATH_ARGS = new Class[] {String.class};
private static final Class [] GET_RES_ARGS = new Class[] {String.class};
private static final String [] DEFAULT_SEARCH_PATH = new String[] {"/WEB-INF/lib/"};
}
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