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// 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.table.model;

import java.io.Serializable;

import org.apache.tapestry.IRender;
import org.apache.tapestry.IRequestCycle;

/**
 * This interface provides a renderer to present the data in a table column. It
 * is usually used by the
 * {@link org.apache.tapestry.contrib.table.model.ITableColumn} implementations
 * via aggregation.
 * 
 * @see org.apache.tapestry.contrib.table.model.common.AbstractTableColumn
 * @author mindbridge
 * @since 2.3
 */
public interface ITableRendererSource extends Serializable
{

    /**
     * Returns a renderer to present the data of the row in the given column.
     * 
     * This method can also be used to return a renderer to present the heading
     * of the column. In such a case the row passed would be null.
     * 
     * @see org.apache.tapestry.contrib.table.model.ITableColumn#getValueRenderer(IRequestCycle,
     *      ITableModelSource, Object)
     */
    IRender getRenderer(IRequestCycle objCycle,
            ITableModelSource objSource, ITableColumn objColumn, Object objRow);

}