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/*
* Copyright (C) 2008 The Guava Authors
*
* 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.common.testing;
import com.google.common.annotations.Beta;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
/**
* Tests may use this to intercept messages that are logged by the code under
* test. Example:
* <pre>
* TestLogHandler handler;
*
* protected void setUp() throws Exception {
* super.setUp();
* handler = new TestLogHandler();
* SomeClass.logger.addHandler(handler);
* addTearDown(new TearDown() {
* public void tearDown() throws Exception {
* SomeClass.logger.removeHandler(handler);
* }
* });
* }
*
* public void test() {
* SomeClass.foo();
* LogRecord firstRecord = handler.getStoredLogRecords().get(0);
* assertEquals("some message", firstRecord.getMessage());
* }
* </pre>
*
* @author Kevin Bourrillion
* @since 10.0
*/
@Beta
public class TestLogHandler extends Handler {
/** We will keep a private list of all logged records */
private final List<LogRecord> list =
Collections.synchronizedList(new ArrayList<LogRecord>());
/**
* Adds the most recently logged record to our list.
*/
@Override
public void publish(LogRecord record) {
list.add(record);
}
@Override
public void flush() { }
@Override
public void close() { }
public void clear() {
list.clear();
}
/**
* Fetch the list of logged records
* @return unmodifiable LogRecord list of all logged records
*/
public List<LogRecord> getStoredLogRecords() {
List<LogRecord> result = new ArrayList<LogRecord>(list);
return Collections.unmodifiableList(result);
}
}
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