| // Copyright 2004 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.ognl; |
| |
| import ognl.Ognl; |
| import ognl.OgnlException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.tapestry.contrib.table.model.ITableColumn; |
| import org.apache.tapestry.contrib.table.model.simple.ITableColumnEvaluator; |
| import org.apache.tapestry.util.prop.OgnlUtils; |
| |
| /** |
| * @author mindbridge |
| * |
| */ |
| public class OgnlTableColumnEvaluator implements ITableColumnEvaluator |
| { |
| private static final Log LOG = |
| LogFactory.getLog(ExpressionTableColumn.class); |
| |
| private String m_strExpression; |
| transient private Object m_objParsedExpression = null; |
| |
| public OgnlTableColumnEvaluator(String strExpression) |
| { |
| m_strExpression = strExpression; |
| } |
| |
| /** |
| * @see org.apache.tapestry.contrib.table.model.simple.ITableColumnEvaluator#getColumnValue(ITableColumn, Object) |
| */ |
| public Object getColumnValue(ITableColumn objColumn, Object objRow) |
| { |
| // If no expression is given, then this is dummy column. Return something. |
| if (m_strExpression == null || m_strExpression.equals("")) |
| return ""; |
| |
| synchronized (this) |
| { |
| if (m_objParsedExpression == null) |
| m_objParsedExpression = |
| OgnlUtils.getParsedExpression(m_strExpression); |
| } |
| |
| try |
| { |
| Object objValue = Ognl.getValue(m_objParsedExpression, objRow); |
| return objValue; |
| } |
| catch (OgnlException e) |
| { |
| LOG.error( |
| "Cannot use column expression '" + m_strExpression + "' in row", |
| e); |
| return ""; |
| } |
| } |
| } |