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.tree.components.table;
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     * @author ceco
027     */
028    public class TreeTableValueRenderSource implements ITableRendererSource
029    {
030    
031        private static final long serialVersionUID = 3237638859391458116L;
032    
033        private ComponentTableRendererSource m_objComponentRenderer;
034        private ComponentAddress m_objComponentAddress = null;
035        
036        /* used to synchronize access */
037        private Object m_sync = new Object();
038        
039        public TreeTableValueRenderSource()
040        {
041            m_objComponentRenderer = null;
042        }
043        
044        public TreeTableValueRenderSource(ComponentAddress objComponentAddress)
045        {
046            m_objComponentAddress = objComponentAddress;
047        }
048        
049        /**
050         * @see org.apache.tapestry.contrib.table.model.ITableRendererSource#getRenderer(IRequestCycle,
051         *      ITableModelSource, ITableColumn, Object)
052         */
053        public IRender getRenderer(IRequestCycle objCycle, ITableModelSource objSource, ITableColumn objColumn,
054                Object objRow)
055        {
056            if (m_objComponentRenderer == null)
057            {
058                synchronized(m_sync)
059                {
060                    ComponentAddress objAddress = m_objComponentAddress;
061                    if (m_objComponentAddress == null)
062                        objAddress = new ComponentAddress("contrib:TreeTableNodeViewPage", "treeTableNodeViewDelegator");
063                    m_objComponentRenderer = new ComponentTableRendererSource(objAddress);
064                }
065            }
066            
067            return m_objComponentRenderer.getRenderer(objCycle, objSource, objColumn, objRow);
068        }
069    
070    }