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.model.simple; 016 017 import org.apache.tapestry.IRender; 018 import org.apache.tapestry.IRequestCycle; 019 import org.apache.tapestry.contrib.table.model.ITableColumn; 020 import org.apache.tapestry.contrib.table.model.ITableModelSource; 021 import org.apache.tapestry.contrib.table.model.ITableRendererSource; 022 import org.apache.tapestry.contrib.table.model.common.ComponentTableRendererSource; 023 import org.apache.tapestry.util.ComponentAddress; 024 025 /** 026 * This is a simple implementation of 027 * {@link org.apache.tapestry.contrib.table.model.ITableRendererSource} 028 * that returns a standard renderer of a column header. <p> 029 * 030 * This implementation requires that the column passed is of type SimpleTableColumn 031 * 032 * @see org.apache.tapestry.contrib.table.model.common.AbstractTableColumn 033 * @author mindbridge 034 * @since 2.3 035 */ 036 public class SimpleTableColumnFormRendererSource implements ITableRendererSource 037 { 038 private static final long serialVersionUID = 1L; 039 040 private ComponentTableRendererSource m_objComponentRenderer; 041 042 public SimpleTableColumnFormRendererSource() 043 { 044 m_objComponentRenderer = null; 045 } 046 047 /** 048 * @see org.apache.tapestry.contrib.table.model.ITableRendererSource#getRenderer(IRequestCycle, ITableModelSource, ITableColumn, Object) 049 */ 050 public IRender getRenderer( 051 IRequestCycle objCycle, 052 ITableModelSource objSource, 053 ITableColumn objColumn, 054 Object objRow) 055 { 056 if (m_objComponentRenderer == null) 057 { 058 synchronized (this) 059 { 060 if (m_objComponentRenderer == null) 061 { 062 ComponentAddress objAddress = 063 new ComponentAddress( 064 objSource.getNamespace(), 065 "SimpleTableColumnPage", 066 "tableColumnFormComponent"); 067 m_objComponentRenderer = 068 new ComponentTableRendererSource(objAddress); 069 } 070 } 071 } 072 073 return m_objComponentRenderer.getRenderer( 074 objCycle, 075 objSource, 076 objColumn, 077 objRow); 078 } 079 }