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The Core Camel Java DSL based router
/**
* 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.camel.component.properties;
import org.apache.camel.util.StringHelper;
/**
* A {@link org.apache.camel.component.properties.PropertiesFunction} that lookup the property value from
* OS environment variables.
*/
public class EnvPropertiesFunction implements PropertiesFunction {
@Override
public String getName() {
return "env";
}
@Override
public String apply(String remainder) {
String key = remainder;
String defaultValue = null;
if (remainder.contains(":")) {
key = StringHelper.before(remainder, ":");
defaultValue = StringHelper.after(remainder, ":");
}
String value = System.getenv(key);
return value != null ? value : defaultValue;
}
}