v2/src/jam/org/apache/xmlbeans/impl/jam/internal/reflect/RClassLoader.java

/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  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 end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache
*    XMLBeans", nor may "Apache" appear in their name, without prior
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2003 BEA Systems
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/

package org.apache.xmlbeans.impl.jam.internal.reflect;

import org.apache.xmlbeans.impl.jam.JAnnotationLoader;
import org.apache.xmlbeans.impl.jam.JClass;
import org.apache.xmlbeans.impl.jam.JClassLoader;
import org.apache.xmlbeans.impl.jam.JPackage;
import org.apache.xmlbeans.impl.jam.internal.ArrayJClass;
import org.apache.xmlbeans.impl.jam.internal.JPackageImpl;
import org.apache.xmlbeans.impl.jam.internal.PrimitiveJClass;
import org.apache.xmlbeans.impl.jam.internal.VoidJClass;

import java.util.HashMap;
import java.util.Map;

/**
 * java.lang.ClassLoader-backed implementation of JClassLoader.
 *
 * @author Patrick Calahan <pcal@bea.com>
 */
public class RClassLoader implements JClassLoader {

  // ========================================================================
  // Variables

  private ClassLoader mLoader;
  private Map mFd2Class = new HashMap(), mName2Package = new HashMap();
  private JClassLoader mParentLoader;

  // ========================================================================
  // Constructors

  public RClassLoader(ClassLoader c) {
    this(c, null);
  }

  public RClassLoader(ClassLoader c, JClassLoader parent) {
    if (c == null) throw new IllegalArgumentException("null classloader");
    mLoader = c;
    mParentLoader = parent; //this can be null
  }

  // ========================================================================
  // JClassLoader implementation

  public JClassLoader getParent() {
    return mParentLoader;
  }

  /**
   *
   */
  public JAnnotationLoader getAnnotationLoader() {
    return null;
  }//FIXME

  /**
   * Returns a reflect representation of the named class.  Throws
   * ClassNotFound
   */
  public JClass loadClass(String fd) throws ClassNotFoundException {
    fd = fd.trim();
    // check cache first
    JClass out = (JClass) mFd2Class.get(fd);
    if (out != null) return out;
    // is it an array?
    if (fd.startsWith("[")) {
      mFd2Class.put(fd, out = ArrayJClass.createClassFor(fd, this));
      return out;
    }
    // see if it's a primitive.  REVIEW i think this check should only
    // happen if we're the system RClassLoader.
    out = PrimitiveJClass.getPrimitiveClassForName(fd);
    if (out != null) {
      mFd2Class.put(fd, out);
      return out;
    }
    // see if it's void.  REVIEW i think this check should only happen
    // if we're the system RClassLoader.
    if (VoidJClass.isVoid(fd)) {
      mFd2Class.put(fd, out = VoidJClass.getInstance());
      return out;
    }
    // still no dice.  ok, try to load it
    try {
      mFd2Class.put(fd, out = new RClass(mLoader.loadClass(fd), this));
      return out;
    } catch (ClassNotFoundException ignore) {
    }
    // doh.  ok, hand off to our parent.  if we don't have one, we're
    // done.
    if (mParentLoader == null) {
      throw new ClassNotFoundException(fd);
    } else {
      return mParentLoader.loadClass(fd);
    }
  }

  public JPackage getPackage(String named) {
    named = named.trim();
    JPackage out = (JPackage) mName2Package.get(named);
    if (out == null) {
      mName2Package.put(named, out = new JPackageImpl(named));
    }
    return out;
  }

}