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.ognl; 016 017 import org.apache.commons.logging.Log; 018 import org.apache.commons.logging.LogFactory; 019 import org.apache.tapestry.contrib.table.model.ITableColumn; 020 import org.apache.tapestry.contrib.table.model.simple.ITableColumnEvaluator; 021 import org.apache.tapestry.services.ExpressionEvaluator; 022 023 /** 024 * @author mindbridge 025 */ 026 public class OgnlTableColumnEvaluator implements ITableColumnEvaluator 027 { 028 private static final long serialVersionUID = 1L; 029 030 /** @since 4.0 */ 031 032 private ExpressionEvaluator _expressionEvaluator; 033 034 private static final Log LOG = LogFactory.getLog(OgnlTableColumnEvaluator.class); 035 036 private String m_strExpression; 037 038 public OgnlTableColumnEvaluator(String strExpression, ExpressionEvaluator expressionEvaluator) 039 { 040 m_strExpression = strExpression; 041 _expressionEvaluator = expressionEvaluator; 042 } 043 044 /** 045 * @see org.apache.tapestry.contrib.table.model.simple.ITableColumnEvaluator#getColumnValue(ITableColumn, 046 * Object) 047 */ 048 public synchronized Object getColumnValue(ITableColumn objColumn, Object objRow) 049 { 050 // If no expression is given, then this is a dummy column. Return something. 051 if (m_strExpression == null || m_strExpression.equals("")) 052 return ""; 053 054 try 055 { 056 return _expressionEvaluator.read(objRow, m_strExpression); 057 } 058 catch (Exception e) 059 { 060 LOG.error("Cannot use column expression '" + m_strExpression + "' in row", e); 061 return ""; 062 } 063 } 064 }