001/*
002 * Copyright 2002-2009 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.expression;
018
019/**
020 * Parses expression strings into compiled expressions that can be evaluated.
021 * Supports parsing templates as well as standard expression strings.
022 *
023 * @author Keith Donald
024 * @author Andy Clement
025 * @since 3.0
026 */
027public interface ExpressionParser {
028
029        /**
030         * Parse the expression string and return an Expression object you can use for repeated evaluation.
031         * <p>Some examples:
032         * <pre class="code">
033         *     3 + 4
034         *     name.firstName
035         * </pre>
036         * @param expressionString the raw expression string to parse
037         * @return an evaluator for the parsed expression
038         * @throws ParseException an exception occurred during parsing
039         */
040        Expression parseExpression(String expressionString) throws ParseException;
041
042        /**
043         * Parse the expression string and return an Expression object you can use for repeated evaluation.
044         * <p>Some examples:
045         * <pre class="code">
046         *     3 + 4
047         *     name.firstName
048         * </pre>
049         * @param expressionString the raw expression string to parse
050         * @param context a context for influencing this expression parsing routine (optional)
051         * @return an evaluator for the parsed expression
052         * @throws ParseException an exception occurred during parsing
053         */
054        Expression parseExpression(String expressionString, ParserContext context) throws ParseException;
055
056}