001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.contrib.table.model.common;
016    
017    import java.io.Serializable;
018    
019    import org.apache.tapestry.contrib.table.model.ITableModel;
020    import org.apache.tapestry.contrib.table.model.ITablePagingState;
021    import org.apache.tapestry.contrib.table.model.ITableSortingState;
022    import org.apache.tapestry.contrib.table.model.simple.SimpleTableState;
023    
024    /**
025     * A base table model that implements the handling of the model state.
026     * Used by most standard ITableModel implementations.
027     * 
028     * @author mindbridge
029     */
030    public abstract class AbstractTableModel implements ITableModel, Serializable
031    {
032        private SimpleTableState m_objTableState;
033    
034        protected AbstractTableModel()
035        {
036            this(new SimpleTableState());
037        }
038    
039        protected AbstractTableModel(SimpleTableState objTableState)
040        {
041            m_objTableState = objTableState;
042        }
043        
044        /**
045         * @see org.apache.tapestry.contrib.table.model.ITableModel#getPagingState()
046         */
047        public ITablePagingState getPagingState()
048        {
049            return getState().getPagingState();
050        }
051    
052        /**
053         * @see org.apache.tapestry.contrib.table.model.ITableModel#getSortingState()
054         */
055        public ITableSortingState getSortingState()
056        {
057            return getState().getSortingState();
058        }
059    
060        /**
061         * Returns the tableState.
062         * @return SimpleTableState
063         */
064        public SimpleTableState getState()
065        {
066            return m_objTableState;
067        }
068    
069        protected abstract int getRowCount();
070        
071        public int getPageCount()
072        {
073            int nRowCount = getRowCount();
074            if (nRowCount == 0)
075                return 1;
076    
077            int nPageSize = getPagingState().getPageSize();
078            if (nPageSize <= 0)
079                return 1;
080    
081            return (nRowCount - 1) / nPageSize + 1;
082        }
083        
084    }