spring SpelExpressionParser 源码
spring SpelExpressionParser 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/standard/SpelExpressionParser.java
/*
* 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
*
* https://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.standard;
import org.springframework.expression.ParseException;
import org.springframework.expression.ParserContext;
import org.springframework.expression.common.TemplateAwareExpressionParser;
import org.springframework.expression.spel.SpelParserConfiguration;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* SpEL parser. Instances are reusable and thread-safe.
*
* @author Andy Clement
* @author Juergen Hoeller
* @since 3.0
*/
public class SpelExpressionParser extends TemplateAwareExpressionParser {
private final SpelParserConfiguration configuration;
/**
* Create a parser with default settings.
*/
public SpelExpressionParser() {
this.configuration = new SpelParserConfiguration();
}
/**
* Create a parser with the specified configuration.
* @param configuration custom configuration options
*/
public SpelExpressionParser(SpelParserConfiguration configuration) {
Assert.notNull(configuration, "SpelParserConfiguration must not be null");
this.configuration = configuration;
}
public SpelExpression parseRaw(String expressionString) throws ParseException {
return doParseExpression(expressionString, null);
}
@Override
protected SpelExpression doParseExpression(String expressionString, @Nullable ParserContext context) throws ParseException {
return new InternalSpelExpressionParser(this.configuration).doParseExpression(expressionString, context);
}
}
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