/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed 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.springframework.expression.spel;
/**
* Captures the possible configuration settings for a compiler that can be
* used when evaluating expressions.
*
* @author Andy Clement
* @since 4.1
*/
public enum SpelCompilerMode {
/**
* The compiler is switched off; this is the default.
*/
OFF,
/**
* In immediate mode, expressions are compiled as soon as possible (usually after 1 interpreted run).
* If a compiled expression fails it will throw an exception to the caller.
*/
IMMEDIATE,
/**
* In mixed mode, expression evaluation silently switches between interpreted and compiled over time.
* After a number of runs the expression gets compiled. If it later fails (possibly due to inferred
* type information changing) then that will be caught internally and the system switches back to
* interpreted mode. It may subsequently compile it again later.
*/
MIXED
}