| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.cocoon.forms.formmodel.algorithms; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.cocoon.forms.expression.ExpressionManager; |
| import org.apache.cocoon.forms.formmodel.CalculatedFieldAlgorithm; |
| import org.apache.cocoon.forms.util.DomHelper; |
| import org.outerj.expression.Expression; |
| import org.outerj.expression.VariableFunction; |
| import org.w3c.dom.Element; |
| |
| /** |
| * Builds a {@link org.apache.cocoon.forms.formmodel.algorithms.SimpleFormula} |
| * algorithm. |
| * <p> |
| * The syntax is as follows : |
| * <code> |
| * <fd:value type="formula" eval="..."> [triggers="..."]/> |
| * </code> |
| * </p> |
| * @version $Id$ |
| */ |
| public class SimpleFormulaBuilder extends AbstractBaseAlgorithmBuilder { |
| |
| private ExpressionManager expressionManager; |
| private ServiceManager serviceManager; |
| |
| |
| public CalculatedFieldAlgorithm build(Element algorithmElement) throws Exception { |
| String formula = DomHelper.getAttribute(algorithmElement, "eval"); |
| SimpleFormula ret = new SimpleFormula(); |
| setupExpression(formula, ret); |
| super.setup(algorithmElement, ret); |
| return ret; |
| } |
| |
| protected Expression setupExpression(String formula) throws Exception { |
| return expressionManager.parse(formula); |
| } |
| |
| protected void setupExpression(String formula, SimpleFormula algo) throws Exception { |
| Expression expression = expressionManager.parse(formula); |
| algo.setFormula(expression); |
| List vars = expressionManager.parseVariables(formula); |
| for (Iterator iter = vars.iterator(); iter.hasNext();) { |
| VariableFunction var = (VariableFunction) iter.next(); |
| algo.addTrigger(var.getVariableName()); |
| } |
| } |
| |
| public void service(ServiceManager serviceManager) throws ServiceException { |
| this.serviceManager = serviceManager; |
| this.expressionManager = (ExpressionManager)serviceManager.lookup(ExpressionManager.ROLE); |
| } |
| |
| public void dispose() { |
| this.serviceManager.release(this.expressionManager); |
| this.expressionManager = null; |
| this.serviceManager = null; |
| } |
| } |