simplefilter.java

来自「think in java TIJ-3rd-edition-code.zip」· Java 代码 · 共 38 行

//: X1:SimpleFilter.java
import com.bruceeckel.simpletest.*;
import java.util.logging.*;

public class SimpleFilter {
  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) {
    SimpleTest monitor =
      new SimpleTest("SimpleFilter");
    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[] {
    });
  }
} ///:~