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
015package org.apache.tapestry.contrib.table.model.common;
016
017import java.io.Serializable;
018
019import org.apache.tapestry.contrib.table.model.ITableModel;
020import org.apache.tapestry.contrib.table.model.ITablePagingState;
021import org.apache.tapestry.contrib.table.model.ITableSortingState;
022import 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 */
030public 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}