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

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

import java.text.*;

import org.apache.juneau.internal.*;

/**
 * Subclass of runtime exceptions that take in a message and zero or more arguments.
 */
public abstract class BasicRuntimeException extends RuntimeException {

	private static final long serialVersionUID = 1L;

	final boolean unmodifiable;

	/**
	 * Creates a new builder for this bean.
	 *
	 * @return A new builder for this bean.
	 */
	public static BasicRuntimeExceptionBuilder create() {
		return new BasicRuntimeExceptionBuilder();
	}

	/**
	 * Constructor.
	 *
	 * @param builder The builder containing the settings for this exception.
	 */
	public BasicRuntimeException(BasicRuntimeExceptionBuilder builder) {
		super(builder.message, builder.causedBy);
		this.unmodifiable = builder.unmodifiable;
	}

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

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

	/**
	 * Constructor.
	 *
	 * @param cause The cause of this exception.
	 */
	public BasicRuntimeException(Throwable cause) {
		this(create().causedBy(cause));
	}

	/**
	 * 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);
	}

	@Override /* Throwable */
	public String getMessage() {
		String m = super.getMessage();
		if (m == null && getCause() != null)
			m = getCause().getMessage();
		return m;
	}

	@Override /* Throwable */
	public synchronized Throwable fillInStackTrace() {
		assertModifiable();
		return super.fillInStackTrace();
	}

	@Override /* Throwable */
	public synchronized Throwable initCause(Throwable cause) {
		assertModifiable();
		return super.initCause(cause);
	}

	@Override /* Throwable */
	public void setStackTrace(StackTraceElement[] stackTrace) {
		assertModifiable();
		super.setStackTrace(stackTrace);
	}

	/**
	 * Throws an {@link UnsupportedOperationException} if the unmodifiable flag is set on this bean.
	 */
	protected final void assertModifiable() {
		if (unmodifiable)
			throw new UnsupportedOperationException("Bean is read-only");
	}
}