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.simple;
016
017import java.io.Serializable;
018import java.util.HashMap;
019import java.util.Iterator;
020import java.util.List;
021import java.util.Map;
022
023import org.apache.tapestry.contrib.table.model.ITableColumn;
024import org.apache.tapestry.contrib.table.model.ITableColumnModel;
025import org.apache.tapestry.contrib.table.model.common.ArrayIterator;
026
027/**
028 * A minimal implementation of the 
029 * {@link org.apache.tapestry.contrib.table.model.ITableColumnModel} interface
030 * that stores columns as an array.
031 * 
032 * @author mindbridge
033 */
034public class SimpleTableColumnModel implements ITableColumnModel, Serializable
035{
036        private static final long serialVersionUID = 1L;
037        
038    private ITableColumn[] m_arrColumns;
039    private Map m_mapColumns;
040
041    public SimpleTableColumnModel(ITableColumn[] arrColumns)
042    {
043        m_arrColumns = arrColumns;
044
045        m_mapColumns = new HashMap();
046        for (int i = 0; i < m_arrColumns.length; i++)
047            m_mapColumns.put(m_arrColumns[i].getColumnName(), m_arrColumns[i]);
048    }
049
050    public SimpleTableColumnModel(List arrColumns)
051    {
052        this((ITableColumn[]) arrColumns.toArray(new ITableColumn[arrColumns.size()]));
053    }
054
055    public int getColumnCount()
056    {
057        return m_arrColumns.length;
058    }
059
060    public ITableColumn getColumn(int nColumn)
061    {
062        if (nColumn < 0 || nColumn >= m_arrColumns.length)
063        {
064            // error message
065            return null;
066        }
067        return m_arrColumns[nColumn];
068    }
069
070    public ITableColumn getColumn(String strColumn)
071    {
072        return (ITableColumn) m_mapColumns.get(strColumn);
073    }
074
075    public Iterator getColumns()
076    {
077        return new ArrayIterator(m_arrColumns);
078    }
079
080}