optionaldataexception.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 82 行

/*
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program 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
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 */
package java.io;

/**
 * Exception indicating the failure of an object read operation due to
 * unread primitive data, or the end of data belonging to a serialized
 * object in the stream.  This exception may be thrown in two cases:
 *
 * <ul>
 *   <li>An attempt was made to read an object when the next element in the
 *       stream is primitive data.  In this case, the OptionalDataException's
 *       length field is set to the number of bytes of primitive data
 *       immediately readable from the stream, and the eof field is set to
 *       false.
 *
 *   <li>An attempt was made to read past the end of data consumable by a
 *       class-defined readObject or readExternal method.  In this case, the
 *       OptionalDataException's eof field is set to true, and the length field
 *       is set to 0.
 * </ul>
 *
 * @author  unascribed
 * @version 1.21, 10/10/06
 * @since   JDK1.1
 */
public class OptionalDataException extends ObjectStreamException {
    /*
     * Create an <code>OptionalDataException</code> with a length.
     */
    OptionalDataException(int len) {
	eof = false;
	length = len;
    }

    /*
     * Create an <code>OptionalDataException</code> signifing no
     * more primitive data is available.
     */
    OptionalDataException(boolean end) {
	length = 0;
	eof = end;
    }

    /**
     * The number of bytes of primitive data available to be read
     * in the current buffer.
     *
     * @serial
     */
    public int length;

    /**
     * True if there is no more data in the buffered part of the stream.
     *
     * @serial
     */
    public boolean eof;
}