ambari-metrics-common/src/main/java/org/apache/hadoop/metrics2/sink/timeline/configuration/Configuration.java

/**
 * 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.hadoop.metrics2.sink.timeline.configuration;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Configuration {
  public final Log LOG = LogFactory.getLog(this.getClass());
  private final Properties properties;

  public Configuration(String configFile) {
    properties = new Properties();

    //Get property file stream from classpath
    InputStream inputStream = Configuration.class.getResourceAsStream(configFile);

    if (inputStream == null) {
      throw new IllegalArgumentException(configFile + " not found in classpath");
    }

    // load the properties
    try {
      properties.load(inputStream);
      inputStream.close();
    } catch (FileNotFoundException fnf) {
      LOG.info("No configuration file " + configFile + " found in classpath.", fnf);
    } catch (IOException ie) {
      throw new IllegalArgumentException("Can't read configuration file " +
          configFile, ie);
    }
  }

  public String getProperty(String key) {
    return properties.getProperty(key);
  }

  public String getProperty(String key, String defaultValue) {
    return properties.getProperty(key, defaultValue);
  }
}