// Copyright 2014 Google Inc. All Rights Reserved. // // Licensed 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 com.google.enterprise.connector.util.testing; import java.util.Collection; import java.util.logging.Handler; import java.util.logging.Level; import java.util.logging.LogRecord; import java.util.logging.Logger; /** Tools to test logging output. */ public class Logging { /** * Enables logging and captures matching log messages. The messages * will not be localized or formatted. * * @param clazz the class to enable logging for * @param substring capture log messages containing this substring * @param output captured messages will be added to this collection */ public static void captureLogMessages(Class<?> clazz, final String substring, final Collection<? super String> output) { Logger logger = Logger.getLogger(clazz.getName()); logger.setLevel(Level.ALL); logger.addHandler(new Handler() { @Override public void close() {} @Override public void flush() {} @Override public void publish(LogRecord record) { if (record.getMessage().contains(substring)) { output.add(record.getMessage()); } } }); } private Logging() { throw new AssertionError(); } }