jcifs.context.SingletonContext Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jcifs-ng Show documentation
Show all versions of jcifs-ng Show documentation
A pure-java CIFS/SMB client library
/*
* © 2016 AgNO3 Gmbh & Co. KG
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcifs.context;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import jcifs.CIFSContext;
import jcifs.CIFSException;
import jcifs.config.PropertyConfiguration;
/**
* Global singleton context
*
* @author mbechler
*
*/
public class SingletonContext extends BaseContext implements CIFSContext {
private static final Logger log = LoggerFactory.getLogger(SingletonContext.class);
private static SingletonContext INSTANCE;
/**
* Initialize singleton context using custom properties
*
* This method can only be called once.
*
* @param props
* @throws CIFSException
*/
public static synchronized final void init ( Properties props ) throws CIFSException {
if ( INSTANCE != null ) {
throw new CIFSException("Singleton context is already initialized");
}
Properties p = new Properties();
try {
String filename = System.getProperty("jcifs.properties");
if ( filename != null && filename.length() > 1 ) {
try ( FileInputStream in = new FileInputStream(filename) ) {
p.load(in);
}
}
}
catch ( IOException ioe ) {
log.error("Failed to load config", ioe); //$NON-NLS-1$
}
p.putAll(System.getProperties());
if ( props != null ) {
p.putAll(props);
}
INSTANCE = new SingletonContext(p);
}
/**
* Get singleton context
*
* The singleton context will use system properties for configuration as well as values specified in a file
* specified through this jcifs.properties system property.
*
* @return a global context, initialized on first call
*/
public static synchronized final SingletonContext getInstance () {
if ( INSTANCE == null ) {
try {
log.debug("Initializing singleton context");
init(null);
}
catch ( CIFSException e ) {
log.error("Failed to create singleton JCIFS context", e);
}
}
return INSTANCE;
}
/**
* This static method registers the SMB URL protocol handler which is
* required to use SMB URLs with the java.net.URL class. If this
* method is not called before attempting to create an SMB URL with the
* URL class the following exception will occur:
*
*
*
* Exception MalformedURLException: unknown protocol: smb
* at java.net.URL.<init>(URL.java:480)
* at java.net.URL.<init>(URL.java:376)
* at java.net.URL.<init>(URL.java:330)
* at jcifs.smb.SmbFile.<init>(SmbFile.java:355)
* ...
*
*
*
*
*/
public static void registerSmbURLHandler () {
SingletonContext.getInstance();
String pkgs = System.getProperty("java.protocol.handler.pkgs");
if ( pkgs == null ) {
System.setProperty("java.protocol.handler.pkgs", "jcifs");
}
else if ( pkgs.indexOf("jcifs") == -1 ) {
pkgs += "|jcifs";
System.setProperty("java.protocol.handler.pkgs", pkgs);
}
}
/**
*
*/
private SingletonContext ( Properties p ) throws CIFSException {
super(new PropertyConfiguration(p));
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy