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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.dubbo.common.config;

import org.apache.dubbo.common.utils.StringUtils;

import java.util.Map;

/**
 * Configuration from system environment
 */
public class EnvironmentConfiguration implements Configuration {

    @Override
    public Object getInternalProperty(String key) {
        String value = getenv(key);
        if (StringUtils.isEmpty(value)) {
            value = getenv(StringUtils.toOSStyleKey(key));
        }
        return value;
    }

    public Map getProperties() {
        return getenv();
    }

    // Adapt to System api, design for unit test

    protected String getenv(String key) {
        return System.getenv(key);
    }

    protected Map getenv() {
        return System.getenv();
    }
}