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GlassFish » mail » com » sun » mail » imap » protocol » UIDSet.java
/*
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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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/*
 * @(#)UIDSet.java  1.3 07/05/04
 */
package com.sun.mail.imap.protocol;

import java.util.Vector;

/**
 * This class holds the 'start' and 'end' for a range of UIDs.
 * Just like MessageSet except using long instead of int.
 */
public class UIDSet {

    public long start;
    public long end;

    public UIDSet() { }

    public UIDSet(long start, long end) {
  this.start = start;
  this.end = end;
    }

    /**
     * Count the total number of elements in a UIDSet
     **/
    public long size() {
  return end - start + 1;
    }

    /*
     * Convert an array of longs into an array of UIDSets
     */
    public static UIDSet[] createUIDSets(long[] msgs) {
  Vector v = new Vector();
  int i,j;

  for (i=0; i < msgs.length; i++) {
      UIDSet ms = new UIDSet();
      ms.start = msgs[i];

      // Look for contiguous elements
      for (j=i+1; j < msgs.length; j++) {
    if (msgs[j] != msgs[j-1] +1)
        break;
      }
      ms.end = msgs[j-1];
      v.addElement(ms);
      i = j-1; // i gets incremented @ top of the loop
  }
  UIDSet[] msgsets = new UIDSet[v.size()];  
  v.copyInto(msgsets);
  return msgsets;
    }

    /**
     * Convert an array of UIDSets into an IMAP sequence range
     */
    public static String toString(UIDSet[] msgsets) {
  if (msgsets == null || msgsets.length == 0) // Empty msgset
      return null; 

  int i = 0;  // msgset index
  StringBuffer s = new StringBuffer();
  int size = msgsets.length;
  long start, end;

  for (;;) {
      start = msgsets[i].start;
      end = msgsets[i].end;

      if (end > start)
    s.append(start).append(':').append(end);
      else // end == start means only one element
    s.append(start);
  
      i++; // Next UIDSet
      if (i >= size) // No more UIDSets
    break;
      else
    s.append(',');
  }
  return s.toString();
    }

  
    /*
     * Count the total number of elements in an array of UIDSets
     */
    public static long size(UIDSet[] msgsets) {
  long count = 0;

  if (msgsets == null) // Null msgset
      return 0; 

  for (int i=0; i < msgsets.length; i++)
      count += msgsets[i].size();
  
  return count;
    }
}
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