/**
 * Copyright 2016 ZTE Corporation.
 *
 * 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 org.openo.carbon.bpel.config;

import org.apache.commons.lang3.StringUtils;

public class ConfigManager {
  private static BpsExtraProperties extraProperties;
  private static BpsCommonProperties commonProperties;
  private static ConfigManager instance = null;

  private ConfigManager() {
    commonProperties = BpsCommonProperties.getInstance();
    extraProperties = BpsExtraProperties.getInstance();
  }

  public static synchronized ConfigManager getInstance() {
    if (instance == null) {
      instance = new ConfigManager();
    }
    return instance;
  }

  public String getProperty(String key) {
    String value = extraProperties.getProperty(key);
    value = StringUtils.trimToEmpty(value);
    if (StringUtils.isBlank(value)) {
      return commonProperties.getProperty(key);
    }
    return value;
  }

}