spring-batch SystemPropertyInitializer 源码
spring-batch SystemPropertyInitializer 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/support/SystemPropertyInitializer.java
/*
* Copyright 2006-2007 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.batch.support;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
/**
* Helper class that sets up a System property with a default value. A System property is
* created with the specified key name, and default value (i.e. if the property already
* exists it is not changed).
*
* @author Dave Syer
*
*/
public class SystemPropertyInitializer implements InitializingBean {
/**
* Name of system property used by default.
*/
public static final String ENVIRONMENT = "org.springframework.batch.support.SystemPropertyInitializer.ENVIRONMENT";
private String keyName = ENVIRONMENT;
private String defaultValue;
/**
* Set the key name for the System property that is created. Defaults to
* {@link #ENVIRONMENT}.
* @param keyName the key name to set
*/
public void setKeyName(String keyName) {
this.keyName = keyName;
}
/**
* Mandatory property specifying the default value of the System property.
* @param defaultValue the default value to set
*/
public void setDefaultValue(String defaultValue) {
this.defaultValue = defaultValue;
}
/**
* Sets the System property with the provided name and default value.
*
* @see InitializingBean#afterPropertiesSet()
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.state(defaultValue != null || System.getProperty(keyName) != null,
"Either a default value must be specified or the value should already be set for System property: "
+ keyName);
System.setProperty(keyName, System.getProperty(keyName, defaultValue));
}
}
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