| /* |
| * 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.outerj.expression.Expression; |
| import org.outerj.expression.ParseException; |
| import org.outerj.expression.ExpressionException; |
| |
| /** |
| * Work interface for the component that creates Expression objects. |
| * The reason for centralising the creation of expressions is so that |
| * new functions can be registered in one place. |
| * |
| * @version $Id$ |
| */ |
| public interface ExpressionManager { |
| |
| String ROLE = ExpressionManager.class.getName(); |
| |
| /** |
| * Parse the given expression. |
| * @param expression The string containing the expression to parse. |
| * @return The Expression object resulting from parse. |
| * @throws ParseException If something goes wrong while parsing. |
| * @throws ExpressionException If the expression has been parsed successfully but is invalid. |
| */ |
| Expression parse(String expression) throws ParseException, ExpressionException; |
| |
| /** |
| * Parse the given expression to extract variables. |
| * @param expressionString The string containing the expression to parse. |
| * @return A {@link List} of {@link org.outerj.expression.VariableFunction}, one for each variable used in the expression. |
| * @see org.outerj.expression.VariableFunction#getVariableName() |
| * @throws ParseException If something goes wrong while parsing. |
| * @throws ExpressionException If the expression has been parsed successfully but is invalid. |
| */ |
| List parseVariables(String expressionString) throws ParseException, ExpressionException; |
| } |