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Common code shared by Catalina and Jasper for scanning JARS and processing XML descriptors

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/*
 * 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);
    }
}