private V removeFromBtree()

in mavibot/src/main/java/org/apache/directory/mavibot/btree/PersistedValueHolder.java [372:445]
59 lines of code
8 McCabe index (conditional complexity)

    private V removeFromBtree( V removedValue )
    {
        // First check that we have a loaded BTree
        checkAndDeserialize();

        if ( btreeContains( removedValue ) )
        {
            try
            {
                if ( valueBtree.getNbElems() - 1 < PersistedBTree.valueThresholdLow )
                {
                    int nbValues = ( int ) ( valueBtree.getNbElems() - 1 );

                    // We have to switch to an Array of values
                    valueArray = ( V[] ) Array.newInstance( valueSerializer.getType(), nbValues );

                    // Now copy all the value but the one we have removed
                    TupleCursor<V, V> cursor = valueBtree.browse();
                    V returnedValue = null;
                    int pos = 0;

                    while ( cursor.hasNext() )
                    {
                        Tuple<V, V> tuple = cursor.next();

                        V value = tuple.getKey();

                        if ( valueSerializer.getComparator().compare( removedValue, value ) == 0 )
                        {
                            // This is the removed value : skip it
                            returnedValue = value;
                        }
                        else
                        {
                            valueArray[pos++] = value;
                        }
                    }

                    cursor.close();

                    return returnedValue;
                }
                else
                {
                    Tuple<V, V> removedTuple = valueBtree.delete( removedValue );

                    if ( removedTuple != null )
                    {
                        return removedTuple.getKey();
                    }
                    else
                    {
                        return null;
                    }
                }
            }
            catch ( IOException e )
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return null;
            }
            catch ( KeyNotFoundException knfe )
            {
                // TODO Auto-generated catch block
                knfe.printStackTrace();
                return null;
            }
        }
        else
        {
            return null;
        }
    }