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tinylog native logging implementation
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/*
 * 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 text message of a log entry.
 */
final class MessageToken implements Token {

	private static final String NEW_LINE = System.getProperty("line.separator");

	/** */
	MessageToken() {
	}

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

	@Override
	public void render(final LogEntry logEntry, final StringBuilder builder) {
		String message = logEntry.getMessage();

		if (message != null) {
			int cartridgeReturn = message.indexOf('\r');
			int lineFeed = message.indexOf('\n');
			int position = 0;

			while (true) {
				if (cartridgeReturn >= 0 && (lineFeed < 0 || cartridgeReturn < lineFeed)) {
					builder.append(message, position, cartridgeReturn);
					builder.append(NEW_LINE);

					position = cartridgeReturn + 1;
					cartridgeReturn = message.indexOf('\r', position);
				} else if (lineFeed >= 0) {
					if (position == 0 || message.charAt(position - 1) != '\r') {
						builder.append(message, position, lineFeed);
						builder.append(NEW_LINE);
					}

					position = lineFeed + 1;
					lineFeed = message.indexOf('\n', position);
				} else {
					builder.append(message, position, message.length());
					break;
				}
			}
		}
	}

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

}