TimestampPathAlgorithm.java

/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 fedorax.server.module.storage.lowlevel.irods;

import java.io.File;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.HashMap;

import org.fcrepo.server.errors.LowlevelStorageException;
import org.fcrepo.server.storage.lowlevel.PathAlgorithm;

/**
 * This class was copied wholesale from the original by Bill Niebel as part of the default lowlevel storage module for
 * Fedora Commons. It has not changed at all yet, but the original had default scope and was unavailable to custom
 * modules.
 *
 * @author Bill Niebel, Greg Jansen
 */
class TimestampPathAlgorithm extends PathAlgorithm {

	private String storeBase;

	private static final String[] PADDING = { "", "0", "00", "000" };

	private static final String SEP = File.separator;

	public TimestampPathAlgorithm(String storeBase) {
		super(new HashMap<String, String>());
		this.storeBase = storeBase;
	}

	@Override
	public final String get(String pid) throws LowlevelStorageException {
		return format(encode(pid));
	}

	public String format(String pid) throws LowlevelStorageException {
		GregorianCalendar calendar = new GregorianCalendar();
		String year = Integer.toString(calendar.get(Calendar.YEAR));
		String month = leftPadded(1 + calendar.get(Calendar.MONTH), 2);
		String dayOfMonth = leftPadded(calendar.get(Calendar.DAY_OF_MONTH), 2);
		String hourOfDay = leftPadded(calendar.get(Calendar.HOUR_OF_DAY), 2);
		String minute = leftPadded(calendar.get(Calendar.MINUTE), 2);
		// String second = leftPadded(calendar.get(Calendar.SECOND),2);
		return storeBase + SEP + year + SEP + month + dayOfMonth + SEP + hourOfDay + SEP + minute /*
																																 * + sep + second
																																 */+ SEP + pid;
	}

	private final String leftPadded(int i, int n) throws LowlevelStorageException {
		if (n > 3 || n < 0 || i < 0 || i > 999) {
			throw new LowlevelStorageException(true, getClass().getName() + ": faulty date padding");
		}
		int m = i > 99 ? 3 : i > 9 ? 2 : 1;
		int p = n - m;
		return PADDING[p] + Integer.toString(i);
	}
}