/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j;
import junit.framework.Assert;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.VectorAppender;
import org.apache.log4j.spi.LoggingEvent;
import java.util.Vector;
/**
* Helper class to set up and capture log messages.
*/
public class LogCapture {
/**
* Appender.
*/
private final VectorAppender appender;
/**
* Expected level.
*/
private final Level level;
/**
* Creates new instance of LogCapture.
*
*/
public LogCapture(final Level level) {
this.level = level;
Logger root = Logger.getRootLogger();
appender = new VectorAppender();
root.addAppender(appender);
}
/**
* Get message.
* @return rendered message, null if no logging event captured.
*/
public String getMessage() {
Vector vector = appender.getVector();
String msg = null;
switch (vector.size()) {
case 0:
break;
case 1:
LoggingEvent event = (LoggingEvent) vector.elementAt(0);
Assert.assertNotNull(event);
Assert.assertEquals(level, event.getLevel());
msg = event.getRenderedMessage();
break;
default:
Assert.fail("More than one request captured");
}
return msg;
}
}