TestAppender.java

package biz.paluch.logging.gelf.log4j;

import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;

import org.apache.log4j.Layout;
import org.apache.log4j.WriterAppender;

/**
 * @author Mark Paluch
 */
public class TestAppender extends WriterAppender {

    private static final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    private static final OutputStreamWriter writer = new OutputStreamWriter(baos);

    public TestAppender() {
        setWriter(writer);
    }

    public TestAppender(Layout layout) {
        setWriter(writer);
        setLayout(layout);
    }

    public static String[] getLoggedLines() {
        String loggedLines = TestAppender.baos.toString();
        return loggedLines.split(Layout.LINE_SEP);
    }

    public static void clearLoggedLines() {
        baos.reset();
    }
}