SimpleFilter.java Source code

Introduction

Here is the source code for SimpleFilter.java

Source

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

import java.util.logging.Filter;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

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) {
        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();

    }
} ///:~