spring SpringPropertyAction 源码
springboot SpringPropertyAction 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/SpringPropertyAction.java
/*
* Copyright 2012-2019 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.boot.logging.logback;
import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.action.ActionUtil;
import ch.qos.logback.core.joran.action.ActionUtil.Scope;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.util.OptionHelper;
import org.xml.sax.Attributes;
import org.springframework.core.env.Environment;
/**
* Logback {@link Action} to support {@code <springProperty>} tags. Allows logback
* properties to be sourced from the Spring environment.
*
* @author Phillip Webb
* @author Eddú Meléndez
* @author Madhura Bhave
*/
class SpringPropertyAction extends Action {
private static final String SOURCE_ATTRIBUTE = "source";
private static final String DEFAULT_VALUE_ATTRIBUTE = "defaultValue";
private final Environment environment;
SpringPropertyAction(Environment environment) {
this.environment = environment;
}
@Override
public void begin(InterpretationContext context, String elementName, Attributes attributes) throws ActionException {
String name = attributes.getValue(NAME_ATTRIBUTE);
String source = attributes.getValue(SOURCE_ATTRIBUTE);
Scope scope = ActionUtil.stringToScope(attributes.getValue(SCOPE_ATTRIBUTE));
String defaultValue = attributes.getValue(DEFAULT_VALUE_ATTRIBUTE);
if (OptionHelper.isEmpty(name) || OptionHelper.isEmpty(source)) {
addError("The \"name\" and \"source\" attributes of <springProperty> must be set");
}
ActionUtil.setProperty(context, name, getValue(source, defaultValue), scope);
}
private String getValue(String source, String defaultValue) {
if (this.environment == null) {
addWarn("No Spring Environment available to resolve " + source);
return defaultValue;
}
return this.environment.getProperty(source, defaultValue);
}
@Override
public void end(InterpretationContext context, String name) throws ActionException {
}
}
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- 本文标签： Spring Boot Spring Java
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