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 org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.tapestry.IRequestCycle;
019    import org.apache.tapestry.contrib.table.model.ITableRowSource;
020    
021    /**
022     * The base implementation for a component that is wrapped by 
023     * the TableRows component. Provides a utility method for getting 
024     * a pointer to TableRows. 
025     * 
026     * @author mindbridge
027     */
028    public abstract class AbstractTableRowComponent extends AbstractTableViewComponent
029    {
030        public ITableRowSource getTableRowSource()
031        {
032            IRequestCycle objCycle = getPage().getRequestCycle();
033    
034            Object objSourceObj = objCycle.getAttribute(ITableRowSource.TABLE_ROW_SOURCE_ATTRIBUTE);
035            ITableRowSource objSource = (ITableRowSource) objSourceObj;
036    
037            if (objSource == null)
038                throw new ApplicationRuntimeException(
039                    "The component "
040                        + getId()
041                        + " must be contained within an ITableRowSource component, such as TableRows",
042                    this,
043                    null,
044                    null);
045    
046            return objSource;
047        }
048    
049    }