simplefilter.java

Thinking in Java第三版书中的源代码

//: c15:SimpleFilter.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import com.bruceeckel.simpletest.*;
import java.util.logging.*;

public class SimpleFilter {
  private static Test monitor = new Test();
  private static Logger logger =
    Logger.getLogger("SimpleFilter");
  static class Duck {};
  static class Wombat {};
  static void sendLogMessages() {
    logger.log(Level.WARNING,
      "A duck in the house!", new Duck());
    logger.log(Level.WARNING,
      "A Wombat at large!", new Wombat());
  }
  public static void main(String[] args) {
    sendLogMessages();
    logger.setFilter(new Filter() {
      public boolean isLoggable(LogRecord record) {
        Object[] params = record.getParameters();
        if(params == null)
          return true; // No parameters
        if(record.getParameters()[0] instanceof Duck)
          return true;  // Only log Ducks
        return false;
      }
    });
    logger.info("After setting filter..");
    sendLogMessages();
    monitor.expect(new String[] {
      "%% .* SimpleFilter sendLogMessages",
      "WARNING: A duck in the house!",
      "%% .* SimpleFilter sendLogMessages",
      "WARNING: A Wombat at large!",
      "%% .* SimpleFilter main",
      "INFO: After setting filter..",
      "%% .* SimpleFilter sendLogMessages",
      "WARNING: A duck in the house!"
    });
  }
} ///:~