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tinylog native logging implementation

There is a newer version: 2.8.0-M1

/*
 * Copyright 2016 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.tinylog.pattern;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Collection;
import java.util.Collections;

import org.tinylog.core.LogEntry;
import org.tinylog.core.LogEntryValue;

/**
 * Token for outputting the name of the package in which a log entry has been issued.
 */
final class PackageNameToken implements Token {

	/** */
	PackageNameToken() {
	}

	@Override
	public Collection getRequiredLogEntryValues() {
		return Collections.singleton(LogEntryValue.CLASS);
	}

	@Override
	public void render(final LogEntry logEntry, final StringBuilder builder) {
		String packageName = getPackage(logEntry.getClassName());
		if (packageName != null) {
			builder.append(packageName);
		}
	}

	@Override
	public void apply(final LogEntry logEntry, final PreparedStatement statement, final int index) throws SQLException {
		statement.setString(index, getPackage(logEntry.getClassName()));
	}

	/**
	 * Gets the package name from a fully qualified class name.
	 * 
	 * @param fullyQualifiedClassName
	 *            Fully qualified class name
	 * @return Package name or {@code null} for default package
	 */
	private static String getPackage(final String fullyQualifiedClassName) {
		if (fullyQualifiedClassName == null) {
			return null;
		}
		int dotIndex = fullyQualifiedClassName.lastIndexOf('.');
		if (dotIndex == -1) {
			return null;
		} else {
			return fullyQualifiedClassName.substring(0, dotIndex);
		}
	}

}