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.components;
016
017 import java.util.ArrayList;
018 import java.util.List;
019 import java.util.StringTokenizer;
020
021 import org.apache.hivemind.ApplicationRuntimeException;
022 import org.apache.tapestry.IComponent;
023 import org.apache.tapestry.contrib.table.model.IAdvancedTableColumn;
024 import org.apache.tapestry.contrib.table.model.IAdvancedTableColumnSource;
025 import org.apache.tapestry.contrib.table.model.ITableColumn;
026 import org.apache.tapestry.contrib.table.model.ITableColumnModel;
027 import org.apache.tapestry.contrib.table.model.simple.SimpleTableColumn;
028 import org.apache.tapestry.contrib.table.model.simple.SimpleTableColumnModel;
029 import org.apache.tapestry.services.ExpressionEvaluator;
030
031 /**
032 * A placeholder for a static methods related to the Table component
033 *
034 * @since 3.0
035 * @author Mindbridge
036 */
037 public class TableColumnModelSourceImpl implements TableColumnModelSource
038 {
039 /** @since 4.0 */
040 private ExpressionEvaluator _expressionEvaluator;
041
042 /** @since 4.0 */
043
044 public void setExpressionEvaluator(ExpressionEvaluator expressionEvaluator)
045 {
046 _expressionEvaluator = expressionEvaluator;
047 }
048
049 /**
050 * Generate a table column model out of the description string provided. Entries in the
051 * description string are separated by commas. Each column entry is of the format name,
052 * name:expression, or name:displayName:expression. An entry prefixed with ! represents a
053 * non-sortable column. If the whole description string is prefixed with *, it represents
054 * columns to be included in a Form.
055 *
056 * @param strDesc
057 * the description of the column model to be generated
058 * @param objComponent
059 * the component ordering the generation
060 * @param objColumnSettingsContainer
061 * the component containing the column settings
062 * @return a table column model based on the provided parameters
063 */
064 public ITableColumnModel generateTableColumnModel(IAdvancedTableColumnSource objColumnSource,
065 String strDesc, IComponent objComponent, IComponent objColumnSettingsContainer)
066 {
067 if (strDesc == null)
068 return null;
069
070 List arrColumns = new ArrayList();
071
072 strDesc = strDesc.trim();
073 boolean bFormColumns = false;
074 while (strDesc.startsWith("*"))
075 {
076 strDesc = strDesc.substring(1);
077 bFormColumns = true;
078 }
079
080 StringTokenizer objTokenizer = new StringTokenizer(strDesc, ",");
081 while (objTokenizer.hasMoreTokens())
082 {
083 String strToken = objTokenizer.nextToken().trim();
084
085 if (strToken.startsWith("="))
086 {
087 String strColumnExpression = strToken.substring(1);
088
089 Object objColumn = _expressionEvaluator.read(
090 objColumnSettingsContainer,
091 strColumnExpression);
092
093 if (!(objColumn instanceof ITableColumn))
094 throw new ApplicationRuntimeException(TableMessages.notAColumn(
095 objComponent,
096 strColumnExpression));
097
098 arrColumns.add(objColumn);
099 continue;
100 }
101
102 boolean bSortable = true;
103 if (strToken.startsWith("!"))
104 {
105 strToken = strToken.substring(1);
106 bSortable = false;
107 }
108
109 StringTokenizer objColumnTokenizer = new StringTokenizer(strToken, ":");
110
111 String strName = "";
112 if (objColumnTokenizer.hasMoreTokens())
113 strName = objColumnTokenizer.nextToken();
114
115 String strExpression = strName;
116 if (objColumnTokenizer.hasMoreTokens())
117 strExpression = objColumnTokenizer.nextToken();
118
119 String strDisplayName = strName;
120 if (objColumnTokenizer.hasMoreTokens())
121 {
122 strDisplayName = strExpression;
123 strExpression = objColumnTokenizer.nextToken();
124 }
125
126 IAdvancedTableColumn objColumn =
127 objColumnSource.generateTableColumn(strName, strDisplayName,
128 bSortable, strExpression);
129 if (bFormColumns)
130 objColumn.setColumnRendererSource(SimpleTableColumn.FORM_COLUMN_RENDERER_SOURCE);
131 if (objColumnSettingsContainer != null)
132 objColumn.loadSettings(objColumnSettingsContainer);
133
134 arrColumns.add(objColumn);
135 }
136
137 return new SimpleTableColumnModel(arrColumns);
138 }
139
140 }