/*
 * Copyright 2015 JBoss Inc
 *
 * 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
 *
 *      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 io.apiman.common.util;

import org.apache.commons.lang3.text.StrLookup;

/**
 * A simple string lookup class that supports system properties and environment
 * variables.
 *
 * @author eric.wittmann@redhat.com
 */
public class ApimanStrLookup extends StrLookup<String> {

    @Override
    public String lookup(String key) {
        String replacement = System.getProperty(key);
        if (replacement == null) {
            replacement = System.getenv(key);
        }
        return replacement;
    }

}
