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}