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Java > Open Source Codes > edu > rice > cs > util > NullFile


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33
34 package edu.rice.cs.util;
35 import java.io.File JavaDoc;
36 import java.io.Serializable JavaDoc;
37
38 /** A null file. This class is NOT a singleton because we need multiple, distinct null files for untitled documents.
39   * The equals method is overridden so that distinct NullFile objects (which all have the same path) are unequal.
40   */
41 public class NullFile extends File JavaDoc implements Serializable JavaDoc {
42
43   public NullFile() { super(""); }
44   public String JavaDoc toString() { return "(Untitled)"; }
45   
46   /** All distinct objects of type NullFile are unequal. */
47   public boolean equals(Object JavaDoc o) {
48     if (o == null || o.getClass() != getClass()) return false;
49     return o == this;
50   }
51     
52 }
53
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