/**
* JCL (Jar Class Loader)
*
* Copyright (C) 2011 Kamran Zafar
*
* This file is part of Jar Class Loader (JCL).
* Jar Class Loader (JCL) is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JarClassLoader is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JCL. If not, see <http://www.gnu.org/licenses/>.
*
* @author Kamran Zafar
*
* Contact Info:
* Email: xeus.man@gmail.com
* Web: http://xeustech.blogspot.com
*/
package org.xeustechnologies.jcl;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.xeustechnologies.jcl.exception.JclException;
import org.xeustechnologies.jcl.exception.ResourceNotFoundException;
/**
* Class that builds a local classpath by loading resources from different
* files/paths
*
* @author Kamran Zafar
*
*/
public class ClasspathResources extends JarResources {
private static Logger logger = Logger.getLogger( ClasspathResources.class.getName() );
private boolean ignoreMissingResources;
public ClasspathResources() {
super();
ignoreMissingResources = Configuration.suppressMissingResourceException();
}
/**
* Reads the resource content
*
* @param resource
*/
private void loadResourceContent(String resource, String pack) {
File resourceFile = new File( resource );
String entryName = "";
FileInputStream fis = null;
byte[] content = null;
try {
fis = new FileInputStream( resourceFile );
content = new byte[(int) resourceFile.length()];
if (fis.read( content ) != -1) {
if (pack.length() > 0) {
entryName = pack + "/";
}
entryName += resourceFile.getName();
if (jarEntryContents.containsKey( entryName )) {
if (!collisionAllowed)
throw new JclException( "Resource " + entryName + " already loaded" );
else {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Resource " + entryName + " already loaded; ignoring entry..." );
return;
}
}
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Loading resource: " + entryName );
jarEntryContents.put( entryName, content );
}
} catch (IOException e) {
throw new JclException( e );
} finally {
try {
fis.close();
} catch (IOException e) {
throw new JclException( e );
}
}
}
/**
* Attempts to load a remote resource (jars, properties files, etc)
*
* @param url
*/
private void loadRemoteResource(URL url) {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Attempting to load a remote resource." );
if (url.toString().toLowerCase().endsWith( ".jar" )) {
loadJar( url );
return;
}
InputStream stream = null;
ByteArrayOutputStream out = null;
try {
stream = url.openStream();
out = new ByteArrayOutputStream();
int byt;
while (( ( byt = stream.read() ) != -1 )) {
out.write( byt );
}
byte[] content = out.toByteArray();
if (jarEntryContents.containsKey( url.toString() )) {
if (!collisionAllowed)
throw new JclException( "Resource " + url.toString() + " already loaded" );
else {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Resource " + url.toString() + " already loaded; ignoring entry..." );
return;
}
}
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Loading remote resource." );
jarEntryContents.put( url.toString(), content );
} catch (IOException e) {
throw new JclException( e );
} finally {
if (out != null)
try {
out.close();
} catch (IOException e) {
throw new JclException( e );
}
if (stream != null)
try {
stream.close();
} catch (IOException e) {
throw new JclException( e );
}
}
}
/**
* Reads the class content
*
* @param clazz
* @param pack
*/
private void loadClassContent(String clazz, String pack) {
File cf = new File( clazz );
FileInputStream fis = null;
String entryName = "";
byte[] content = null;
try {
fis = new FileInputStream( cf );
content = new byte[(int) cf.length()];
if (fis.read( content ) != -1) {
entryName = pack + "/" + cf.getName();
if (jarEntryContents.containsKey( entryName )) {
if (!collisionAllowed)
throw new JclException( "Class " + entryName + " already loaded" );
else {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Class " + entryName + " already loaded; ignoring entry..." );
return;
}
}
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Loading class: " + entryName );
jarEntryContents.put( entryName, content );
}
} catch (IOException e) {
throw new JclException( e );
} finally {
if (fis != null)
try {
fis.close();
} catch (IOException e) {
throw new JclException( e );
}
}
}
/**
* Reads local and remote resources
*
* @param url
*/
public void loadResource(URL url) {
try {
// Is Local
loadResource( new File( url.toURI() ), "" );
} catch (IllegalArgumentException iae) {
// Is Remote
loadRemoteResource( url );
} catch (URISyntaxException e) {
throw new JclException( "URISyntaxException", e );
}
}
/**
* Reads local resources from - Jar files - Class folders - Jar Library
* folders
*
* @param path
*/
public void loadResource(String path) {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Resource: " + path );
File fp = new File( path );
if (!fp.exists() && !ignoreMissingResources) {
throw new JclException( "File/Path does not exist" );
}
loadResource( fp, "" );
}
/**
* Reads local resources from - Jar files - Class folders - Jar Library
* folders
*
* @param fol
* @param packName
*/
private void loadResource(File fol, String packName) {
if (fol.isFile()) {
if (fol.getName().toLowerCase().endsWith( ".class" )) {
loadClassContent( fol.getAbsolutePath(), packName );
} else {
if (fol.getName().toLowerCase().endsWith( ".jar" )) {
loadJar( fol.getAbsolutePath() );
} else {
loadResourceContent( fol.getAbsolutePath(), packName );
}
}
return;
}
if (fol.list() != null) {
for (String f : fol.list()) {
File fl = new File( fol.getAbsolutePath() + "/" + f );
String pn = packName;
if (fl.isDirectory()) {
if (!pn.equals( "" ))
pn = pn + "/";
pn = pn + fl.getName();
}
loadResource( fl, pn );
}
}
}
/**
* Removes the loaded resource
*
* @param resource
*/
public void unload(String resource) {
if (jarEntryContents.containsKey( resource )) {
if (logger.isLoggable( Level.FINEST ))
logger.finest( "Removing resource " + resource );
jarEntryContents.remove( resource );
} else {
throw new ResourceNotFoundException( resource, "Resource not found in local ClasspathResources" );
}
}
public boolean isCollisionAllowed() {
return collisionAllowed;
}
public void setCollisionAllowed(boolean collisionAllowed) {
this.collisionAllowed = collisionAllowed;
}
public boolean isIgnoreMissingResources() {
return ignoreMissingResources;
}
public void setIgnoreMissingResources(boolean ignoreMissingResources) {
this.ignoreMissingResources = ignoreMissingResources;
}
}