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Jetty example source code file (Loader.java)

This example Jetty source code file (Loader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

class, class, classloader, classloader, classnotfoundexception, classnotfoundexception, loader, locale, missingresourceexception, missingresourceexception, net, network, resourcebundle, url, util

The Jetty Loader.java source code

// ========================================================================
// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.util;

import java.net.URL;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/* ------------------------------------------------------------ */
/** ClassLoader Helper.
 * This helper class allows classes to be loaded either from the
 * Thread's ContextClassLoader, the classloader of the derived class
 * or the system ClassLoader.
 *
 * <B>Usage:
 * public class MyClass {
 *     void myMethod() {
 *          ...
 *          Class c=Loader.loadClass(this.getClass(),classname);
 *          ...
 *     }
 * </PRE>          
 * @author Greg Wilkins (gregw)
 */
public class Loader
{
    /* ------------------------------------------------------------ */
    public static URL getResource(Class loadClass,String name, boolean checkParents)
        throws ClassNotFoundException
    {
        URL url =null;
        ClassLoader loader=Thread.currentThread().getContextClassLoader();
        while (url==null && loader!=null )
        {
            url=loader.getResource(name); 
            loader=(url==null&&checkParents)?loader.getParent():null;
        }      
        
        loader=loadClass==null?null:loadClass.getClassLoader();
        while (url==null && loader!=null )
        {
            url=loader.getResource(name); 
            loader=(url==null&&checkParents)?loader.getParent():null;
        }       

        if (url==null)
        {
            url=ClassLoader.getSystemResource(name);
        }   

        return url;
    }

    /* ------------------------------------------------------------ */
    public static Class loadClass(Class loadClass,String name)
        throws ClassNotFoundException
    {
        return loadClass(loadClass,name,false);
    }
    
    /* ------------------------------------------------------------ */
    /** Load a class.
     * 
     * @param loadClass
     * @param name
     * @param checkParents If true, try loading directly from parent classloaders.
     * @return Class
     * @throws ClassNotFoundException
     */
    public static Class loadClass(Class loadClass,String name,boolean checkParents)
        throws ClassNotFoundException
    {
        ClassNotFoundException ex=null;
        Class c =null;
        ClassLoader loader=Thread.currentThread().getContextClassLoader();
        while (c==null && loader!=null )
        {
            try { c=loader.loadClass(name); }
            catch (ClassNotFoundException e) {if(ex==null)ex=e;}
            loader=(c==null&&checkParents)?loader.getParent():null;
        }      
        
        loader=loadClass==null?null:loadClass.getClassLoader();
        while (c==null && loader!=null )
        {
            try { c=loader.loadClass(name); }
            catch (ClassNotFoundException e) {if(ex==null)ex=e;}
            loader=(c==null&&checkParents)?loader.getParent():null;
        }       

        if (c==null)
        {
            try { c=Class.forName(name); }
            catch (ClassNotFoundException e) {if(ex==null)ex=e;}
        }   

        if (c!=null)
            return c;
        throw ex;
    }

    public static ResourceBundle getResourceBundle(Class loadClass,String name,boolean checkParents, Locale locale)
        throws MissingResourceException
    {
        MissingResourceException ex=null;
        ResourceBundle bundle =null;
        ClassLoader loader=Thread.currentThread().getContextClassLoader();
        while (bundle==null && loader!=null )
        {
            try { bundle=ResourceBundle.getBundle(name, locale, loader); }
            catch (MissingResourceException e) {if(ex==null)ex=e;}
            loader=(bundle==null&&checkParents)?loader.getParent():null;
        }      
        
        loader=loadClass==null?null:loadClass.getClassLoader();
        while (bundle==null && loader!=null )
        {
            try { bundle=ResourceBundle.getBundle(name, locale, loader); }
            catch (MissingResourceException e) {if(ex==null)ex=e;}
            loader=(bundle==null&&checkParents)?loader.getParent():null;
        }       

        if (bundle==null)
        {
            try { bundle=ResourceBundle.getBundle(name, locale); }
            catch (MissingResourceException e) {if(ex==null)ex=e;}
        }   

        if (bundle!=null)
            return bundle;
        throw ex;
    }
    

}

Other Jetty examples (source code examples)

Here is a short list of links related to this Jetty Loader.java source code file:

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