org.apache.tomcat.util.digester.EnvironmentPropertySource Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.tomcat.util.digester;
import org.apache.tomcat.util.IntrospectionUtils;
/**
* A {@link org.apache.tomcat.util.IntrospectionUtils.PropertySource}
* that uses environment variables to resolve expressions.
*
* Usage example:
*
* Configure the certificate with environment variables.
*
*
* {@code
*
* }
*
*
* How to configure:
*
* {@code
* echo "org.apache.tomcat.util.digester.PROPERTY_SOURCE=org.apache.tomcat.util.digester.EnvironmentPropertySource" >> conf/catalina.properties}
*
* or add this to {@code CATALINA_OPTS}
*
*
* {@code
* -Dorg.apache.tomcat.util.digester.PROPERTY_SOURCE=org.apache.tomcat.util.digester.EnvironmentPropertySource}
*
*
* NOTE: When configured the PropertySource for resolving expressions
* from system properties is still active.
*
* @see Digester
*
* @see Tomcat Configuration Reference System Properties
*/
public class EnvironmentPropertySource implements IntrospectionUtils.PropertySource {
@Override
public String getProperty(String key) {
return System.getenv(key);
}
}