content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 spacefiller.peasy.org.apache.commons.math;
  
  import java.io.PrintStream;
  import java.io.PrintWriter;
  import java.text.MessageFormat;
  import java.util.Locale;
  import java.util.MissingResourceException;
  import java.util.ResourceBundle;
  
  /**
   * Base class for commons-math checked exceptions.
   * <p>
   * Supports nesting, emulating JDK 1.4 behavior if necessary.
   * </p>
   * <p>
   * 
   * @version $Revision: 620312 $ $Date: 2008-02-10 12:28:59 -0700 (Sun, 10 Feb
   *          2008) $
   */
  public class MathException extends Exception {
  
  	/** Serializable version identifier */
  	private static final long serialVersionUID = -8602234299177097102L;
  
  	/**
  	 * Does JDK support nested exceptions?
  	 */
  	private static final boolean JDK_SUPPORTS_NESTED;
  
  	static {
  		boolean flag = false;
  		try {
  			Throwable.class.getDeclaredMethod("getCause", new Class[0]);
  			flag = true;
  		} catch (final NoSuchMethodException ex) {
  			flag = false;
  		}
  		JDK_SUPPORTS_NESTED = flag;
  	}
  
  	/** Cache for resources bundle. */
  	private static ResourceBundle cachedResources = null;
  
  	/**
  	 * Pattern used to build the message.
  	 */
  	private final String pattern;
  
  	/**
  	 * Arguments used to build the message.
  	 */
  	private final Object[] arguments;
  
  	/**
  	 * Root cause of the exception
  	 */
  	private final Throwable rootCause;
  
  	/**
  	 * Translate a string to a given locale.
  	 * 
  	 * @param s
  	 *            string to translate
  	 * @param locale
  	 *            locale into which to translate the string
  	 * @return translated string or original string for unsupported locales or
  	 *         unknown strings
  	 */
  	private static String translate(final String s, final Locale locale) {
  		try {
  			if ((cachedResources == null)
  					|| (!cachedResources.getLocale().equals(locale))) {
  				// caching the resource bundle
  				cachedResources = ResourceBundle.getBundle(
  						"spacefiller.peasy.org.apache.commons.math.MessagesResources", locale);
  			}
  
  			if (cachedResources.getLocale().getLanguage().equals(locale.getLanguage())) {
  				// the value of the resource is the translated string
  				return cachedResources.getString(s);
  			}
  
  		} catch (final MissingResourceException mre) {
  			// do nothing here
  		}
  
  		// the locale is not supported or the resource is unknown
  		// don't translate and fall back to using the string as is
  		return s;
  
  	}
  
  	/**
  	 * Builds a message string by from a pattern and its arguments.
  	 * 
  	 * @param pattern
  	 *            format specifier
  	 * @param arguments
  	 *            format arguments
  	 * @param locale
  	 *            Locale in which the message should be translated
  	 * @return a message string
  	 */
  	private static String buildMessage(final String pattern, final Object[] arguments,
  			final Locale locale) {
  		// do it the hard way, for Java 1.3. compatibility
  		final MessageFormat mf = new MessageFormat(translate(pattern, locale));
  		mf.setLocale(locale);
  		return mf.format(arguments);
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with no detail message.
  	 */
  	public MathException() {
  		super();
  		this.pattern = null;
  		this.arguments = new Object[0];
  		this.rootCause = null;
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with specified detail
  	 * message.
  	 * 
  	 * @param msg
  	 *            the error message.
  	 * @deprecated as of 1.2, replaced by
  	 *             {@link #MathException(String, Object[])}
  	 */
  	@Deprecated
  	public MathException(final String msg) {
  		super(msg);
  		this.pattern = msg;
  		this.arguments = new Object[0];
  		this.rootCause = null;
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with specified formatted
  	 * detail message. Message formatting is delegated to
  	 * {@link java.text.MessageFormat}.
  	 * 
  	 * @param pattern
  	 *            format specifier
  	 * @param arguments
  	 *            format arguments
  	 */
  	public MathException(final String pattern, final Object[] arguments) {
  		super(buildMessage(pattern, arguments, Locale.US));
  		this.pattern = pattern;
  		this.arguments = arguments.clone();
  		this.rootCause = null;
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with specified nested
  	 * <code>Throwable</code> root cause.
  	 * 
  	 * @param rootCause
  	 *            the exception or error that caused this exception to be
  	 *            thrown.
  	 */
  	public MathException(final Throwable rootCause) {
  		super((rootCause == null ? null : rootCause.getMessage()));
  		this.pattern = getMessage();
  		this.arguments = new Object[0];
  		this.rootCause = rootCause;
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with specified detail message
  	 * and nested <code>Throwable</code> root cause.
  	 * 
  	 * @param msg
  	 *            the error message.
  	 * @param rootCause
  	 *            the exception or error that caused this exception to be
  	 *            thrown.
  	 * @deprecated as of 1.2, replaced by
  	 *             {@link #MathException(String, Object[], Throwable)}
  	 */
  	@Deprecated
  	public MathException(final String msg, final Throwable rootCause) {
  		super(msg);
  		this.pattern = msg;
  		this.arguments = new Object[0];
  		this.rootCause = rootCause;
  	}
  
  	/**
  	 * Constructs a new <code>MathException</code> with specified formatted
  	 * detail message and nested <code>Throwable</code> root cause. Message
  	 * formatting is delegated to {@link java.text.MessageFormat}.
  	 * 
  	 * @param pattern
  	 *            format specifier
  	 * @param arguments
  	 *            format arguments
  	 * @param rootCause
  	 *            the exception or error that caused this exception to be
  	 *            thrown.
  	 * @since 1.2
  	 */
  	public MathException(final String pattern, final Object[] arguments,
  			final Throwable rootCause) {
  		super(buildMessage(pattern, arguments, Locale.US));
  		this.pattern = pattern;
  		this.arguments = arguments.clone();
  		this.rootCause = rootCause;
  	}
  
  	/**
  	 * Gets the pattern used to build the message of this throwable.
  	 * 
  	 * @return the pattern used to build the message of this throwable
  	 * @since 1.2
  	 */
  	public String getPattern() {
  		return pattern;
  	}
  
  	/**
  	 * Gets the arguments used to build the message of this throwable.
  	 * 
  	 * @return the arguments used to build the message of this throwable
  	 * @since 1.2
  	 */
  	public Object[] getArguments() {
  		return arguments.clone();
  	}
  
  	/**
  	 * Gets the message in a specified locale.
  	 * 
  	 * @param locale
  	 *            Locale in which the message should be translated
  	 * 
  	 * @return localized message
  	 * @since 1.2
  	 */
  	public String getMessage(final Locale locale) {
  		return (pattern == null) ? null : buildMessage(pattern, arguments, locale);
  	}
  
  	/**
  	 * Gets the cause of this throwable.
  	 * 
  	 * @return the cause of this throwable, or <code>null</code>
  	 */
  	@Override
  	public Throwable getCause() {
  		return rootCause;
  	}
  
  	/**
  	 * Prints the stack trace of this exception to the standard error stream.
  	 */
  	@Override
  	public void printStackTrace() {
  		printStackTrace(System.err);
  	}
  
  	/**
  	 * Prints the stack trace of this exception to the specified stream.
  	 * 
  	 * @param out
  	 *            the <code>PrintStream</code> to use for output
  	 */
  	@Override
  	public void printStackTrace(final PrintStream out) {
  		synchronized (out) {
  			final PrintWriter pw = new PrintWriter(out, false);
  			printStackTrace(pw);
  			// Flush the PrintWriter before it's GC'ed.
  			pw.flush();
  		}
  	}
  
  	/**
  	 * Prints the stack trace of this exception to the specified writer.
  	 * 
  	 * @param out
  	 *            the <code>PrintWriter</code> to use for output
  	 */
  	@Override
  	public void printStackTrace(final PrintWriter out) {
  		synchronized (out) {
  			super.printStackTrace(out);
  			if (rootCause != null && JDK_SUPPORTS_NESTED == false) {
  				out.print("Caused by: ");
  				rootCause.printStackTrace(out);
  			}
  		}
  	}
  
  }
  