/**
 * Copyright (c) 2010, Anchor Intelligence. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the
 *   distribution.
 *
 * - Neither the name of Anchor Intelligence nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */
package com.fraudwall.util.io;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.text.DateFormat;
import java.util.Date;

import org.apache.commons.lang.time.DateUtils;

import com.fraudwall.util.date.AnchorDateFormat;

/**
 * {@link TimeGrainRotatingWriter} that creates new files on UTC date boundaries.
 * Appends to existing files.
 */
public class DailyRotatingWriter extends TimeGrainRotatingWriter {
	private final File outDir;
	private final DateFormat dateFormat;

	/**
	 * Constructs a new Writer that will create a new file on each day boundary.
	 * @param outDir Directory in which new files are created.
	 * @param filenamePattern Pattern passed to {@link AnchorDateFormat} to determine the names of the
	 * created files. For example, SI files use the pattern "yyyyMMdd'.dat'".
	 */
	public DailyRotatingWriter(File outDir, String filenamePattern) {
		super(DateUtils.MILLIS_PER_DAY);
		this.outDir = outDir;
		dateFormat = new AnchorDateFormat(filenamePattern);
	}

	@Override
	public Writer getWriter(long t) throws IOException {
		File currentFile = new File(outDir, dateFormat.format(new Date(t)));
		return new BufferedWriter(new FileWriter(currentFile, /*append=*/ true));
	}
}
