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}