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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   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.apache.xmlbeans.impl.jam.internal.classrefs;

import org.apache.xmlbeans.impl.jam.JClass;
import org.apache.xmlbeans.impl.jam.JamClassLoader;

/**
 * Reference to a JClass by qualified name which is resolved lazily.  Note
 * that resolved references are not cached, which makes it more likely that
 * a JClasses will become available for garbage collection.  The performance
 * hit here is probably not significant, but someday we might want to provide
 * switch to enable caching of references.
 *
 * @author Patrick Calahan <email: pcal-at-bea-dot-com>
 */
public class QualifiedJClassRef implements JClassRef {

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

  private String mQualifiedClassname;
  private JamClassLoader mClassLoader;

  // ========================================================================
  // Factory

  /**
   * Creates a new JClassRef for a qualified class or type name.
   */
  public static JClassRef create(JClass clazz) {
    if (clazz == null) throw new IllegalArgumentException("null clazz");
    return new QualifiedJClassRef(clazz.getFieldDescriptor(),
                                  clazz.getClassLoader());
  }

  /**
   * Creates a new JClassRef for a qualified class or type name.
   */
  public static JClassRef create(String qcname,
                                 JClassRefContext ctx) {
    if (qcname == null) throw new IllegalArgumentException("null qcname");
    if (ctx == null) throw new IllegalArgumentException("null ctx");
    return create(qcname,ctx.getClassLoader());
  }

  /**
   * Creates a new JClassRef for a qualified class or type name.
   */
  public static JClassRef create(String qcname, JamClassLoader cl) {
    if (qcname == null) throw new IllegalArgumentException("null qcname");
    if (cl == null) throw new IllegalArgumentException("null classloader");
    return new QualifiedJClassRef(qcname,cl);
  }

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

  private QualifiedJClassRef(String qcname, JamClassLoader cl) {
    mClassLoader = cl;
    mQualifiedClassname = qcname;
  }

  // ========================================================================
  // JClassRef implementation

  public JClass getRefClass() {
    return mClassLoader.loadClass(mQualifiedClassname);
  }

  public String getQualifiedName() {
    return mQualifiedClassname;
  }

  // ========================================================================
  // Object implementation

  public String toString() {
    return "(QualifiedJClassRef '"+mQualifiedClassname+"')";
  }
}