| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.contrib.table.model.sql; |
| |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| import java.util.Iterator; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * |
| * @version $Id$ |
| * @author mindbridge |
| */ |
| public class ResultSetIterator implements Iterator |
| { |
| private static final Log LOG = LogFactory.getLog(ResultSetIterator.class); |
| |
| private ResultSet m_objResultSet; |
| private boolean m_bFetched; |
| private boolean m_bAvailable; |
| |
| public ResultSetIterator(ResultSet objResultSet) |
| { |
| m_objResultSet = objResultSet; |
| m_bFetched = false; |
| } |
| |
| /** |
| * @see java.util.Iterator#hasNext() |
| */ |
| public synchronized boolean hasNext() |
| { |
| if (getResultSet() == null) return false; |
| |
| if (!m_bFetched) |
| { |
| m_bFetched = true; |
| |
| try |
| { |
| m_bAvailable = !getResultSet().isLast(); |
| } |
| catch (SQLException e) |
| { |
| LOG.warn( |
| "SQLException while testing for end of the ResultSet", |
| e); |
| m_bAvailable = false; |
| } |
| |
| if (!m_bAvailable) |
| notifyEnd(); |
| } |
| |
| return m_bAvailable; |
| } |
| |
| /** |
| * @see java.util.Iterator#next() |
| */ |
| public synchronized Object next() |
| { |
| ResultSet objResultSet = getResultSet(); |
| |
| try |
| { |
| if (!objResultSet.next()) |
| return null; |
| } |
| catch (SQLException e) |
| { |
| LOG.warn("SQLException while iterating over the ResultSet", e); |
| return null; |
| } |
| |
| m_bFetched = false; |
| return objResultSet; |
| } |
| |
| /** |
| * @see java.util.Iterator#remove() |
| */ |
| public void remove() |
| { |
| try |
| { |
| getResultSet().deleteRow(); |
| } |
| catch (SQLException e) |
| { |
| LOG.error("Cannot delete record", e); |
| } |
| } |
| |
| /** |
| * Returns the resultSet. |
| * @return ResultSet |
| */ |
| public ResultSet getResultSet() |
| { |
| return m_objResultSet; |
| } |
| |
| protected void notifyEnd() |
| { |
| } |
| |
| } |