/*
 * $Header: /cvshome/build/org.osgi.framework/src/org/osgi/framework/InvalidSyntaxException.java,v 1.16 2007/02/20 00:15:00 hargrave Exp $
 * 
 * Copyright (c) OSGi Alliance (2000, 2007). All Rights Reserved.
 * 
 * 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.osgi.framework;

/**
 * A Framework exception used to indicate that a filter string has an invalid
 * syntax.
 * 
 * <p>
 * An <code>InvalidSyntaxException</code> object indicates that a filter
 * string parameter has an invalid syntax and cannot be parsed. See
 * {@link Filter} for a description of the filter string syntax.
 * 
 * <p>
 * This exception is updated to conform to the general purpose exception
 * chaining mechanism.
 * 
 * @version $Revision: 1.16 $
 */

public class InvalidSyntaxException extends Exception {
	static final long		serialVersionUID	= -4295194420816491875L;
	/**
	 * The invalid filter string.
	 */
	private final String	filter;
	/**
	 * Nested exception.
	 */
	private final Throwable	cause;

	/**
	 * Creates an exception of type <code>InvalidSyntaxException</code>.
	 * 
	 * <p>
	 * This method creates an <code>InvalidSyntaxException</code> object with
	 * the specified message and the filter string which generated the
	 * exception.
	 * 
	 * @param msg The message.
	 * @param filter The invalid filter string.
	 */
	public InvalidSyntaxException(String msg, String filter) {
		super(msg);
		this.filter = filter;
		this.cause = null;
	}

	/**
	 * Creates an exception of type <code>InvalidSyntaxException</code>.
	 * 
	 * <p>
	 * This method creates an <code>InvalidSyntaxException</code> object with
	 * the specified message and the filter string which generated the
	 * exception.
	 * 
	 * @param msg The message.
	 * @param filter The invalid filter string.
	 * @param cause The cause of this exception.
	 * @since 1.3
	 */
	public InvalidSyntaxException(String msg, String filter, Throwable cause) {
		super(msg);
		this.filter = filter;
		this.cause = cause;
	}

	/**
	 * Returns the filter string that generated the
	 * <code>InvalidSyntaxException</code> object.
	 * 
	 * @return The invalid filter string.
	 * @see BundleContext#getServiceReferences
	 * @see BundleContext#addServiceListener(ServiceListener,String)
	 */
	public String getFilter() {
		return filter;
	}

	/**
	 * Returns the cause of this exception or <code>null</code> if no cause
	 * was specified when this exception was created.
	 * 
	 * @return The cause of this exception or <code>null</code> if no cause
	 *         was specified.
	 * @since 1.3
	 */
	public Throwable getCause() {
		return cause;
	}

	/**
	 * The cause of this exception can only be set when constructed.
	 * 
	 * @param cause Cause of the exception.
	 * @return This object.
	 * @throws java.lang.IllegalStateException This method will always throw an
	 *         <code>IllegalStateException</code> since the cause of this
	 *         exception can only be set when constructed.
	 * @since 1.3
	 */
	public Throwable initCause(Throwable cause) {
		throw new IllegalStateException();
	}
}