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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;
private final String _lexiName;
public NullFile() {
this("*NullFile<" + ct + ">");
ct++;
}
private NullFile(String lexiName) {
super(lexiName);
_lexiName = lexiName;
}
/* The following two method 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) {
if (o == null || o.getClass() != getClass()) return false;
return o == this;
}
}
