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import java.util.HashMap; |
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import java.util.TreeMap; |
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import java.util.Comparator; |
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* @author Tal Moshaiov (talm@vistaportal.com) |
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HashMap records = null; |
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TreeMap records = null; |
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records = new HashMap(); |
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records = new TreeMap(new RowRecordsComparator()); |
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} |
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/** |
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* compares between two row records according to their row number |
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*/ |
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private class RowRecordsComparator implements Comparator |
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{ |
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/** |
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* Object equality, implemented as object identity |
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* @param o Object we're being compared to |
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* @return true if identical, else false |
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*/ |
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public boolean equals(Object obj) |
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{ |
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return this == obj; |
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} |
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/** |
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* compare method. Checks if any of the parameters is null or not |
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* instances of RowRecord. |
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* One row is less than another if its row number is smaller than |
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* the other's. |
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* |
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* @param row1 first object to compare, better be a RowRecord |
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* @param row2 second object to compare, better be a RowRecord |
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* |
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* @return negative value if row1 < row2, |
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* zero if row1 == row2, |
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* positive value if row1 > row2. |
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*/ |
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public int compare(Object row1, Object row2) { |
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//if any of the records is null, return not equal |
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if (row1 == null || row2 == null) |
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return -1; |
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//if any of the objects isn't a RowRecrod, return not equal |
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if (!(row2 instanceof RowRecord && row2 instanceof RowRecord)) |
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return -1; |
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//get row numbers of both row records |
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int row1Number = ((RowRecord)row1).getRowNumber(); |
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int row2Number = ((RowRecord)row2).getRowNumber(); |
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//compare row numbers and return result |
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if (row1Number == row2Number) |
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return 0; |
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else if (row1Number < row2Number) |
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return -1; |
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else |
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return 1; |
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} |
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}//end private class RowRecordsComparator |
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} |