tapestry/tapestry-contrib/src/java/org/apache/tapestry/contrib/tree/components/table/TreeTableValueRenderSource.java

// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry.contrib.tree.components.table;

import org.apache.tapestry.IRender;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.contrib.table.model.ITableColumn;
import org.apache.tapestry.contrib.table.model.ITableModelSource;
import org.apache.tapestry.contrib.table.model.ITableRendererSource;
import org.apache.tapestry.contrib.table.model.common.ComponentTableRendererSource;
import org.apache.tapestry.util.ComponentAddress;

/**
 * @author ceco
 */
public class TreeTableValueRenderSource implements ITableRendererSource
{

    private static final long serialVersionUID = 3237638859391458116L;

    private ComponentTableRendererSource m_objComponentRenderer;
    private ComponentAddress m_objComponentAddress = null;
    
    /* used to synchronize access */
    private Object m_sync = new Object();
    
    public TreeTableValueRenderSource()
    {
        m_objComponentRenderer = null;
    }
    
    public TreeTableValueRenderSource(ComponentAddress objComponentAddress)
    {
        m_objComponentAddress = objComponentAddress;
    }
    
    /**
     * @see org.apache.tapestry.contrib.table.model.ITableRendererSource#getRenderer(IRequestCycle,
     *      ITableModelSource, ITableColumn, Object)
     */
    public IRender getRenderer(IRequestCycle objCycle, ITableModelSource objSource, ITableColumn objColumn,
            Object objRow)
    {
        if (m_objComponentRenderer == null)
        {
            synchronized(m_sync)
            {
                ComponentAddress objAddress = m_objComponentAddress;
                if (m_objComponentAddress == null)
                    objAddress = new ComponentAddress("contrib:TreeTableNodeViewPage", "treeTableNodeViewDelegator");
                m_objComponentRenderer = new ComponentTableRendererSource(objAddress);
            }
        }
        
        return m_objComponentRenderer.getRenderer(objCycle, objSource, objColumn, objRow);
    }

}