public V insert()

in mavibot/src/main/java/org/apache/directory/mavibot/btree/AbstractBTree.java [403:469]
49 lines of code
11 McCabe index (conditional complexity)

    public V insert( K key, V value ) throws IOException
    {
        // Check that we have a TransactionManager
        if ( transactionManager == null )
        {
            throw new BTreeCreationException( "We don't have a transactionLManager" );
        }

        V existingValue = null;

        if ( key == null )
        {
            throw new IllegalArgumentException( "Key must not be null" );
        }

        // Take the lock if it's not already taken by another thread and if we 
        // aren't on a sub-btree
        if ( btreeType != BTreeTypeEnum.PERSISTED_SUB )
        {
            transactionManager.beginTransaction();
        }

        try
        {
            InsertResult<K, V> result = insert( key, value, -1L );

            if ( result instanceof ExistsResult )
            {
                existingValue = value;
            }
            else if ( result instanceof ModifyResult )
            {
                existingValue = ( ( ModifyResult<K, V> ) result ).getModifiedValue();
            }

            // Commit now if it's not a sub-btree
            if ( btreeType != BTreeTypeEnum.PERSISTED_SUB )
            {
                //FIXME when result type is ExistsResult then we should avoid writing the headers
                transactionManager.commit();
            }

            return existingValue;
        }
        catch ( IOException ioe )
        {
            // We have had an exception, we must rollback the transaction
            // if it's not a sub-btree
            if ( btreeType != BTreeTypeEnum.PERSISTED_SUB )
            {
                transactionManager.rollback();
            }

            return null;
        }
        catch ( DuplicateValueNotAllowedException e )
        {
            // We have had an exception, we must rollback the transaction
            // if it's not a sub-btree
            if ( btreeType != BTreeTypeEnum.PERSISTED_SUB )
            {
                transactionManager.rollback();
            }

            throw e;
        }
    }