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1   /*
2    * Copyright 2004 Jeff Johnston
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *    http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.extremecomponents.table.model;
17  
18  import java.util.ArrayList;
19  import java.util.HashMap;
20  import java.util.Iterator;
21  import java.util.List;
22  import java.util.Map;
23  
24  import org.apache.commons.logging.Log;
25  import org.apache.commons.logging.LogFactory;
26  import org.extremecomponents.table.bean.Column;
27  
28  
29  
30  /***
31   * The first pass over the table just loads up the column properties.
32   * The properties will be loaded up and held here.
33   *
34   * @author Jeff Johnston
35   */
36  public class ColumnMetaData
37  {
38  	private static Log logger = LogFactory.getLog(ColumnMetaData.class);
39  	private TableModel model;
40  	private List columns = new ArrayList();
41  	private Map lookup = new HashMap();
42  	private Column firstColumn;
43  	private Column lastColumn;
44  
45  	public ColumnMetaData(TableModel model)
46  	{
47  		this.model = model;
48  	}
49  
50  	public void addColumn(Column column)
51  	{
52  		boolean invokeExport = model.getExportHandler().invokeExport();
53  		boolean canExport = column.canExport();
54  		if (invokeExport && !canExport)
55  		{
56  			return;
57  		}
58  		
59  		if (firstColumn == null)
60  		{
61  			firstColumn = column;
62  		}
63  		lastColumn = column;
64  		
65  		columns.add(column);
66  		lookup.put(column.getProperty(), column);
67  	}
68  
69  	public Column getColumn(String property)
70  	{
71  		return (Column)lookup.get(property);
72  	}
73  
74  	public int columnCount()
75  	{
76  		return columns.size();
77  	}
78  
79  	public Iterator getColumns()
80  	{
81  		return columns.iterator();
82  	}
83  	
84  	public boolean hasMetatData()
85  	{
86  		return columnCount() > 0;
87  	}
88  	
89  	public boolean isFirstColumn(String property)
90  	{
91  		return firstColumn.getProperty().equals(property);
92  	}
93  	
94  	public boolean isLastColumn(String property)
95  	{
96  		return lastColumn.getProperty().equals(property);
97  	}
98  	
99  	public void destroy()
100 	{
101 		columns.clear();
102 		columns = null;
103 		lookup.clear();
104 		lookup = null;
105 	}	
106 }