001/* 002 * Copyright 2002-2017 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.spel; 018 019import org.springframework.expression.EvaluationContext; 020import org.springframework.expression.EvaluationException; 021import org.springframework.lang.Nullable; 022 023/** 024 * Base superclass for compiled expressions. Each generated compiled expression class 025 * will extend this class and implement the {@link #getValue} method. It is not intended 026 * to be subclassed by user code. 027 * 028 * @author Andy Clement 029 * @since 4.1 030 */ 031public abstract class CompiledExpression { 032 033 /** 034 * Subclasses of CompiledExpression generated by SpelCompiler will provide an 035 * implementation of this method. 036 */ 037 public abstract Object getValue(@Nullable Object target, @Nullable EvaluationContext context) 038 throws EvaluationException; 039 040}