/*
 * 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/**
 * 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.
/**
	 * 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.
/**
	 * 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.
/**
	 * 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

}