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.BaseComponent;
019    import org.apache.tapestry.IRequestCycle;
020    import org.apache.tapestry.contrib.table.model.ITableModelSource;
021    
022    /**
023     * The base implementation for a component that is wrapped by 
024     * the TableView component. Provides a utility method for getting 
025     * a pointer to TableView. 
026     * 
027     * @author mindbridge
028     */
029    public abstract class AbstractTableViewComponent extends BaseComponent
030    {
031        public ITableModelSource getTableModelSource()
032        {
033            IRequestCycle objCycle = getPage().getRequestCycle();
034    
035            ITableModelSource objSource =
036                (ITableModelSource) objCycle.getAttribute(
037                    ITableModelSource.TABLE_MODEL_SOURCE_ATTRIBUTE);
038    
039            if (objSource == null)
040                throw new ApplicationRuntimeException(
041                    "The component "
042                        + getId()
043                        + " must be contained within an ITableModelSource component, such as TableView",
044                    this,
045                    null,
046                    null);
047    
048            return objSource;
049        }
050    
051    }