spring EventExpressionEvaluator 源码
spring EventExpressionEvaluator 代码
文件路径：/spring-context/src/main/java/org/springframework/context/event/EventExpressionEvaluator.java
/*
* Copyright 2002-2019 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.context.event;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.expression.AnnotatedElementKey;
import org.springframework.context.expression.BeanFactoryResolver;
import org.springframework.context.expression.CachedExpressionEvaluator;
import org.springframework.context.expression.MethodBasedEvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.lang.Nullable;
/**
* Utility class for handling SpEL expression parsing for application events.
* <p>Meant to be used as a reusable, thread-safe component.
*
* @author Stephane Nicoll
* @since 4.2
* @see CachedExpressionEvaluator
*/
class EventExpressionEvaluator extends CachedExpressionEvaluator {
private final Map<ExpressionKey, Expression> conditionCache = new ConcurrentHashMap<>(64);
/**
* Determine if the condition defined by the specified expression evaluates
* to {@code true}.
*/
public boolean condition(String conditionExpression, ApplicationEvent event, Method targetMethod,
AnnotatedElementKey methodKey, Object[] args, @Nullable BeanFactory beanFactory) {
EventExpressionRootObject root = new EventExpressionRootObject(event, args);
MethodBasedEvaluationContext evaluationContext = new MethodBasedEvaluationContext(
root, targetMethod, args, getParameterNameDiscoverer());
if (beanFactory != null) {
evaluationContext.setBeanResolver(new BeanFactoryResolver(beanFactory));
}
return (Boolean.TRUE.equals(getExpression(this.conditionCache, methodKey, conditionExpression).getValue(
evaluationContext, Boolean.class)));
}
}
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