juneau-core/juneau-marshall/src/main/java/org/apache/juneau/BasicException.java

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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau;

import static org.apache.juneau.internal.StringUtils.*;

import java.text.*;

import org.apache.juneau.internal.*;

/**
 * Subclass of non-runtime exceptions that take in a message and zero or more arguments.
 */
public abstract class BasicException extends Exception {

	private static final long serialVersionUID = 1L;

	/**
	 * Constructor.
	 *
	 * @param message The {@link MessageFormat}-style message.
	 * @param args Optional {@link MessageFormat}-style arguments.
	 */
	public BasicException(String message, Object...args) {
		super(format(message, args));
	}

	/**
	 * Constructor.
	 *
	 * @param causedBy The cause of this exception.
	 * @param message The {@link MessageFormat}-style message.
	 * @param args Optional {@link MessageFormat}-style arguments.
	 */
	public BasicException(Throwable causedBy, String message, Object...args) {
		this(message, args);
		initCause(causedBy);
	}

	/**
	 * Constructor.
	 *
	 * @param causedBy The cause of this exception.
	 */
	public BasicException(Throwable causedBy) {
		this(causedBy, causedBy.getLocalizedMessage());
	}

	/**
	 * Same as {@link #getCause()} but searches the throwable chain for an exception of the specified type.
	 *
	 * @param c The throwable type to search for.
	 * @param <T> The throwable type to search for.
	 * @return The exception, or <jk>null</jk> if not found.
	 */
	public <T extends Throwable> T getCause(Class<T> c) {
		return ThrowableUtils.getCause(c, this);
	}

	/**
	 * Returns the caused-by exception if there is one.
	 *
	 * @return The caused-by exception if there is one, or this exception if there isn't.
	 */
	public Throwable unwrap() {
		Throwable t = getCause();
		return t == null ? this : t;
	}
}