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.model.simple; 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.valid.RenderString; 023 024 /** 025 * This is a simple implementation of 026 * {@link org.apache.tapestry.contrib.table.model.ITableRendererSource} 027 * that returns a standard renderer of a column value. 028 * 029 * This implementation requires that the column passed is of type SimpleTableColumn 030 * 031 * @see org.apache.tapestry.contrib.table.model.common.AbstractTableColumn 032 * @author mindbridge 033 * @since 2.3 034 */ 035 public class SimpleTableValueRendererSource implements ITableRendererSource 036 { 037 private static final long serialVersionUID = 1L; 038 039 /** 040 * The representation of null values. This is geared towards HTML, but will 041 * work for some other *ML languages as well. In any case, changing the 042 * column's value renderer allows selecting fully custom rendering behaviour. 043 **/ 044 private static final String EMPTY_REPRESENTATION = " "; 045 046 /** 047 * @see org.apache.tapestry.contrib.table.model.ITableRendererSource#getRenderer(IRequestCycle, ITableModelSource, ITableColumn, Object) 048 */ 049 public IRender getRenderer( 050 IRequestCycle objCycle, 051 ITableModelSource objSource, 052 ITableColumn objColumn, 053 Object objRow) 054 { 055 SimpleTableColumn objSimpleColumn = (SimpleTableColumn) objColumn; 056 057 Object objValue = objSimpleColumn.getColumnValue(objRow); 058 if (objValue == null) 059 return new RenderString(EMPTY_REPRESENTATION, true); 060 061 return new RenderString(objValue.toString()); 062 } 063 064 }