nilclassloadermanager.java

树形的java classloader,树形的java classloader,树形的java classloader,

package org.codehaus.classloader;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

/**
 * This ClassLoaderManager is an empty implementation that finds no class/resource.
 * <p>
 * @author Ben Yu
 * Aug 3, 2006 12:36:00 PM
 */
public final class NilClassLoaderManager implements ClassLoaderManager {
  private NilClassLoaderManager(){}
  private static final NilClassLoaderManager singleton = new NilClassLoaderManager();
  public static final ClassLoaderManager instance(){
    return singleton;
  }
  public Class lookupClass(Object except, String name)
      throws ClassNotFoundException {
    throw new ClassNotFoundException(name);
  }

  public String lookupLibrary(Object except, String libname) {
    return null;
  }

  public URL lookupResource(Object except, String name) {
    return null;
  }

  public Enumeration lookupResources(Object except, String name)
      throws IOException {
    return NilEnumeration.instance();
  }
/*
  public Package lookupPackage(Object except, String name) {
    return null;
  }

  public Package[] lookupPackages(Object except) {
    return new Package[]{};
  }
  */
}