/[classpath]/classpath/java/nio/channels/FileLock.java
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Diff of /classpath/java/nio/channels/FileLock.java

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revision 1.3 by mark, Tue Apr 30 21:37:26 2002 UTC revision 1.4 by mkoch, Fri Nov 22 12:35:11 2002 UTC
# Line 37  exception statement from your version. * Line 37  exception statement from your version. *
37    
38  package java.nio.channels;  package java.nio.channels;
39    
40    /**
41     * @since 1.4
42     */
43  public abstract class FileLock  public abstract class FileLock
44  {  {
45      FileChannel channel;    FileChannel channel;
46      long position;    long position;
47      long size;    long size;
48      boolean shared;    boolean shared;
49          
50      protected FileLock(FileChannel channel,    /**
51                         long position,     * Initializes the file lock.
52                         long size,     *
53                         boolean shared)     * @exception IllegalArgumentException If the preconditions on the parameters do not hold
54      {     */
55          this.channel = channel;    protected FileLock (FileChannel channel, long position, long size,
56          this.position = position;                        boolean shared)
57          this.size = size;    {
58          this.shared = shared;      if (position < 0 ||
59      }          size < 0)
60          throw new IllegalArgumentException ();
61    
62        this.channel = channel;
63        this.position = position;
64        this.size = size;
65        this.shared = shared;
66      }
67    
68      public abstract  boolean isValid();    /**
69      public abstract  void release();     * Tells whether or not this lock is valid.
70       */
71      public abstract boolean isValid();
72      public FileChannel channel()  
73      {    /**
74          return channel;     * Releases this lock.
75      }     *
76       * @exception IOException If an error occurs
77      public boolean isShared()     * @exception ClosedChannelException If the locked channel is no longer open.
78      {     */
79          return shared;    public abstract void release ();
80      }        
81      /**
82      public boolean overlaps(long position, long size)     * Returns the file channel upon whose file this lock is held.
83      {     */
84          if (position > this.position+this.size)    public final FileChannel channel ()
85              return false;    {
86        return channel;
87          if (position+size < this.position)    }
88              return false;  
89      /**
90          return true;     * Tells whether this lock is shared.
91      }     */
92      public final boolean isShared ()
93      public long position()    {
94      {      return shared;
95          return position;    }    
96      }  
97      /**
98       * Tells whether or not this lock overlaps the given lock range.
99       */
100      public final boolean overlaps (long position, long size)
101      {
102        if (position > this.position +this.size)
103          return false;
104    
105        if (position + size < this.position)
106          return false;
107    
108        return true;
109      }
110    
111      /**
112       * Returns the position within the file of the first byte of the
113       * locked region.
114       */
115      public final long position ()
116      {
117        return position;
118      }
119            
120      public long size()    /**
121      {     * Returns the size of the locked region in bytes.
122          return size;     */
123      }    public final long size ()
124      {
125      public String toString()      return size;
126      {    }
127          return "file-lock:pos="+position+"size="+size;  
128      }    /**
129       * Returns a string describing the range, type, and validity of this lock.
130       */
131      public final String toString ()
132      {
133        return "file-lock:pos=" + position + "size=" + size;
134      }
135  }  }

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