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/*BEGIN_COPYRIGHT_BLOCK
*
* Copyright (c) 2001-2019, JavaPLT group at Rice University (drjava@rice.edu). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the names of DrJava, the JavaPLT group, Rice University, nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software is Open Source Initiative approved Open Source Software. Open Source Initative Approved is a trademark
* of the Open Source Initiative.
*
* This file is part of DrJava. Download the current version of this project from http://www.drjava.org/ or
* http://sourceforge.net/projects/drjava/
*
* END_COPYRIGHT_BLOCK*/
package edu.rice.cs.util;
import java.io.File;
import java.io.Serializable;
/** A null file. This class is NOT a singleton because we need multiple, distinct null files for untitled documents.
* The equals method is overridden so that distinct NullFile objects (which all have the same path) are unequal.
*/
public class NullFile extends File implements Serializable {
private static volatile int ct = 0;
public NullFile() {
this("*NullFile<" + ct + ">");
ct++;
}
private NullFile(String lexiName) {
super(lexiName);
}
/* The following two methods hide the fact that the name field of this file has the form "*NullFile<ct>". They can
* be commented out for debugging purposes. */
public String toString() { return "(Untitled)"; }
public String getName() { return "(Untitled)"; }
public String getLexiName() { return ""; }
/** All distinct objects of type NullFile are unequal. */
public boolean equals(Object o) { return o == this; }
}