PathDatePrefixQueryRequestParser.java

/*
 *  This file is part of the Wayback archival access software
 *   (http://archive-access.sourceforge.net/projects/wayback/).
 *
 *  Licensed to the Internet Archive (IA) by one or more individual 
 *  contributors. 
 *
 *  The IA licenses this file to You 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.archive.wayback.archivalurl.requestparser;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.archive.wayback.core.WaybackRequest;
import org.archive.wayback.requestparser.BaseRequestParser;
import org.archive.wayback.util.Timestamp;

/**
 * RequestParser implementation that extracts request info from an Archival Url
 * representing an exact URL and a date prefix.
 * <p>This class handles URL paths like:</p>
 * <ul>
 * <li><code>20140101*/http://archive.org/</code></li>
 * <li><code>*/http://archive.org/</code></li>
 * </ul>
 * <p>but, not</p>
 * <ul>
 * <li><code>20140101*/http://archive.org/*</code></li>
 * </ul>
 * @author brad
 */
public class PathDatePrefixQueryRequestParser extends DateUrlPathRequestParser {
	/**
	 * @param wrapped BaseRequestParser which provides general configuration
	 */
	public PathDatePrefixQueryRequestParser(BaseRequestParser wrapped) {
		super(wrapped);
	}

	/**
	 * Regular expression for the first path element (timestamp + "{@code *}").
	 */
	private final static Pattern TIMESTAMP_REGEX = Pattern.compile("(\\d{0,14})\\*");

	@Override
	protected WaybackRequest parseDateUrl(String dateStr, String urlStr) {
		if (urlStr.endsWith("*")) return null;
		
		Matcher matcher = TIMESTAMP_REGEX.matcher(dateStr);
		if (!matcher.matches())
			return null;

		dateStr = matcher.group(1);

		String startDate;
		String endDate;
		String requestDate;
		if (dateStr.length() == 0) {
			startDate = getEarliestTimestamp();
			endDate = getLatestTimestamp();
			requestDate = endDate;
		} else if (dateStr.length() == 14) {
			startDate = getEarliestTimestamp();
			endDate = getLatestTimestamp();
			requestDate = Timestamp.parseAfter(dateStr).getDateStr();
		} else {
			startDate = Timestamp.parseBefore(dateStr).getDateStr();
			endDate = Timestamp.parseAfter(dateStr).getDateStr();
			requestDate = endDate;
		}
		return WaybackRequest.createCaptureQueryRequet(urlStr, requestDate, startDate, endDate);
	}
}