org.pmw.tinylog.policies.SizePolicy Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of tinylog Show documentation
Lightweight logging framework for Java and Android
There is a newer version: 1.3.6
/*
 * Copyright 2012 Martin Winandy
 *
 * 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 org.pmw.tinylog.policies;

import java.io.File;

import org.pmw.tinylog.Configuration;

/**
 * Policy for limiting the size of log files.
 */
@PropertiesSupport(name = "size")
public final class SizePolicy implements Policy {

	private final long maxSize;
	private long size;

	/**
	 * @param maxSize
	 *            Maximum size of a log file in bytes (must be > 0)
	 * @throws IllegalArgumentException
	 *             if maxSize is <= 0
	 */
	public SizePolicy(final long maxSize) throws IllegalArgumentException {
		if (maxSize <= 0L) {
			throw new IllegalArgumentException("maxSize must be > 0");
		}

		this.maxSize = maxSize;
		this.size = 0L;
	}

	/**
	 * String parameter for {@link org.pmw.tinylog.PropertiesLoader PropertiesLoader}.
	 *
	 * @param maxSize
	 *            Maximum size of a log file with byte unit (e.g 16MB)
	 * @throws IllegalArgumentException
	 *             if maxSize is <= 0
	 */
	SizePolicy(final String maxSize) throws IllegalArgumentException {
		try {
			if (maxSize.endsWith("GB")) {
				this.maxSize = Long.parseLong(maxSize.substring(0, maxSize.length() - 2).trim()) * 1024L * 1024L * 1024L;
			} else if (maxSize.endsWith("MB")) {
				this.maxSize = Long.parseLong(maxSize.substring(0, maxSize.length() - 2).trim()) * 1024L * 1024L;
			} else if (maxSize.endsWith("KB")) {
				this.maxSize = Long.parseLong(maxSize.substring(0, maxSize.length() - 2).trim()) * 1024L;
			} else {
				this.maxSize = Long.parseLong(maxSize);
			}
		} catch (NumberFormatException ex) {
			throw new IllegalArgumentException("Size \"" + maxSize + "\" is not numberic");
		}
		if (this.maxSize <= 0L) {
			throw new IllegalArgumentException("Size must be > 0, but is " + this.maxSize);
		}
		this.size = 0L;
	}

	@Override
	public void init(final Configuration configuration) {
		// Do nothing
	}

	@Override
	public boolean check(final File logFile) {
		if (logFile.exists()) {
			size = logFile.length();
			return size <= maxSize;
		} else {
			return true;
		}
	}

	@Override
	public boolean check(final String logEntry) {
		size += logEntry.getBytes().length;
		return size <= maxSize;
	}

	@Override
	public void reset() {
		size = 0L;
	}

}