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   *  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
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  package org.apache.cayenne.configuration;
  
  import java.util.Map;
  
  import org.apache.cayenne.di.Inject;
  
  /**
   * An implementation of {@link RuntimeProperties} that returns properties that
   * were injected via a map in constructor. Each property can be overridden via
   * -D command line option (i.e. in this implementation JVM system properties
   * take precedence over any other property configuration mechanism).
   * 
   * @since 3.1
   */
  public class DefaultRuntimeProperties implements RuntimeProperties {
  
      protected Map<String, String> properties;
  
      public DefaultRuntimeProperties(@Inject(Constants.PROPERTIES_MAP) Map<String, String> properties) {
          this.properties = properties;
      }
  
      @Override
      public String get(String key) {
  
          // TODO: note that System.getProperty uses a synchronized hashtable
          // internally as
          // of Java 1.6. So this method suddenly becomes a synchronization
          // bottleneck.
          String property = System.getProperty(key);
  
          if (property != null) {
              return property;
          }
  
          return properties.get(key);
      }
  
      /**
       * @since 4.0
       */
      @Override
      public String get(String key, String defaultValue) {
          String string = get(key);
          return string != null ? string : defaultValue;
      }
  
      @Override
      public long getLong(String key, long defaultValue) {
          String string = get(key);
          if (string == null) {
              return defaultValue;
          }
  
          try {
              return Long.parseLong(string);
          } catch (NumberFormatException e) {
              // incorrect property format, should we rethrow?
              return defaultValue;
          }
      }
  
      @Override
      public int getInt(String key, int defaultValue) {
          String string = get(key);
          if (string == null) {
              return defaultValue;
          }
  
          try {
              return Integer.parseInt(string);
          } catch (NumberFormatException e) {
              // incorrect property format, should we rethrow?
              return defaultValue;
          }
      }
  
      @Override
      public boolean getBoolean(String key, boolean defaultValue) {
          String string = get(key);
          return string != null ? "true".equalsIgnoreCase(string) : defaultValue;
      }
  }
  