locatorclassloader.java

jena2.5.4推理机系统的一种最基本实现 HP实验室出品

/*
 * (c) Copyright 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package com.hp.hpl.jena.util;

import java.io.InputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;



public class LocatorClassLoader  implements Locator
{
    static Log log = LogFactory.getLog(LocatorClassLoader.class) ;

    ClassLoader classLoader = null ;
    public LocatorClassLoader(ClassLoader _classLoader)
    {
        classLoader =_classLoader ;
    }
    
    public boolean equals( Object other )
    {
        return 
            other instanceof LocatorClassLoader 
            && classLoader == ((LocatorClassLoader) other).classLoader;
    }
    
    public int hashCode()
        { return classLoader.hashCode(); }
    
    public InputStream open(String filenameOrURI)
    {
        if ( classLoader == null )
            return null ;
            
        String fn = FileUtils.toFilename(filenameOrURI) ;
        if ( fn == null )
        {
            if ( FileManager.logAllLookups && log.isTraceEnabled() )
                log.trace("Not found: "+filenameOrURI) ; 
            return null ;
        }
        InputStream in = classLoader.getResourceAsStream(fn) ;
        if ( in == null )
        {
            if ( FileManager.logAllLookups && log.isTraceEnabled() )
                log.trace("Failed to open: "+filenameOrURI) ;
            return in ;
        }
        
        if ( FileManager.logAllLookups  && log.isTraceEnabled() )
            log.trace("Found: "+filenameOrURI) ;
        
        // base = classLoader.getResource(fn).toExternalForm ;       
        return in ;
    }
    public String getName() { return "ClassLoaderLocator" ; }
}
/*
 * (c) Copyright 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */