| /* |
| * 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.expression; |
| |
| import java.util.List; |
| |
| import org.apache.avalon.framework.component.Component; |
| import org.apache.avalon.framework.configuration.Configurable; |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.outerj.expression.DefaultFunctionFactory; |
| import org.outerj.expression.Expression; |
| import org.outerj.expression.ExpressionException; |
| import org.outerj.expression.FormulaParser; |
| import org.outerj.expression.ParseException; |
| |
| /** |
| * Implementation of the {@link ExpressionManager} role. |
| * |
| * Custom functions can be added using configuration elements: |
| * <pre> |
| * <function name="MyFunction" class="net.foo.MyFunction"/> |
| * </pre> |
| * |
| * @version $Id$ |
| */ |
| public class DefaultExpressionManager |
| implements ExpressionManager, Component, Configurable, ThreadSafe { |
| // FIXME: Component is there to allow this block to also run in the 2.1 branch |
| |
| private DefaultFunctionFactory factory; |
| |
| public void configure(Configuration config) throws ConfigurationException { |
| factory = new DefaultFunctionFactory(); |
| |
| Configuration[] functions = config.getChildren("function"); |
| for (int i = 0; i < functions.length; i++) { |
| String name = functions[i].getAttribute("name"); |
| String clazz = functions[i].getAttribute("class"); |
| try { |
| factory.registerFunction(name, Class.forName(clazz)); |
| } catch (ClassNotFoundException e) { |
| throw new ConfigurationException("Can not find class " + clazz + " for function " + name + ": " + e); |
| } |
| } |
| } |
| |
| public Expression parse(String expressionString) throws ParseException, ExpressionException { |
| FormulaParser parser = new FormulaParser(new java.io.StringReader(expressionString), factory); |
| parser.parse(); |
| |
| Expression expression = parser.getExpression(); |
| expression.check(); |
| |
| return expression; |
| } |
| |
| public List parseVariables(String expressionString) throws ParseException, ExpressionException { |
| FormulaParser parser = new FormulaParser(new java.io.StringReader(expressionString), factory); |
| parser.parse(); |
| return parser.getVariables(); |
| } |
| |
| } |