PropertyException.java :  » Scripting » InstantJ » instantj » reflect » Java Open Source

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InstantJ » instantj » reflect » PropertyException.java
/**
 * InstantJ
 * 
 * Copyright (C) 2002 Nils Meier
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 */
package instantj.reflect;

/**
 * Abstract superclass for all exceptions thrown from this package's
 * classes. It can contain a nested exception (the reason for the
 * exception) and contains the name of the property describing the
 * context.
 *
 * @author <A href="mailto:nils@meiers.net">Nils Meier</A>
 */
public abstract class PropertyException extends Exception {

  /** the target of which the property was accessed */
  private Object target;

  /** the name of the property that led to this exception */
  private String property;

  /** the nested reason for the exception */
  private Throwable reason;

  /**
   * Constructor
   */
  public PropertyException(String msg, Object target, String property) {
    super(msg);
    this.target = target;
    this.property = property;
  }

  /**
   * The message (mangled) of this exception
   */
  public String getMessage() {
    return super.getMessage() + " (target=" + target + "," + "property=" + property + ")";
  }

  /**
   * Getter for the name of the property that lead to this exception
   */
  public String getProperty() {
    return property;
  }

  /**
   * Getter for the (nested) reason that led to this exception 
   * while dealing with the property getName()
   */
  public Throwable getReason() {
    return reason;
  }

  /**
   * Getter for the name of the property that lead to this exception
   */
  public Object getTarget() {
    return target;
  }

  /**
   * Convenient logger
   */
  public void printStackTrace(java.io.PrintStream s) {
    if (reason != null) {
      s.println(this);
      reason.printStackTrace(s);
    }
    super.printStackTrace(s);
  }

  /**
   * Convenient logger
   */
  public void printStackTrace(java.io.PrintWriter s) {
    if (reason != null) {
      s.println(this);
      reason.printStackTrace(s);
    }
    super.printStackTrace(s);
  }

  /**
   * Provide a (nested) reason for this exception
   */
  protected void setReason(Throwable reason) {
    this.reason = reason;
  }

}
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