com.soulgalore.velocity.HeaderTool Maven / Gradle / Ivy

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package com.soulgalore.velocity;

import org.apache.http.impl.cookie.DateParseException;
import org.apache.http.impl.cookie.DateUtils;
import org.joda.time.DateTime;
import org.joda.time.Seconds;

public class HeaderTool {

	public HeaderTool() {
		
	}
	
	public Seconds getSeconds(int seconds) {
		return Seconds.seconds(seconds);
	}
	
	
	public Seconds getDelta(String from, String to) {

		if (from == null)
			return null;
		else if (to == null)
			to = new DateTime().toString();

		DateTime lastModified;
		DateTime today;

		try {
			lastModified = new DateTime(DateUtils.parseDate(from));
			today = new DateTime(DateUtils.parseDate(to));
			return Seconds.secondsBetween(lastModified, today);

		} catch (DateParseException e) {
			return null;
		}

	}

	public Seconds getCacheTime(String fullCacheControl, String expires, String now) {

		if (fullCacheControl != null && !"".equals(fullCacheControl))
			return getMaxAge(fullCacheControl.trim(), expires, now);
		else {
			if (expires != null)
				return getDelta(now.trim(), expires.trim());
			else
				return Seconds.ZERO;
		}

	}

	public Seconds getMaxAge(String fullCacheControl, String expires, String now) {

		if (doMaxAgeExist(fullCacheControl)) {
			
			String firstPart = fullCacheControl.substring(
					fullCacheControl.indexOf("max-age=") + 8,
					fullCacheControl.length());

			String sec = firstPart.indexOf(",") > 0 ? firstPart.substring(0,
					firstPart.indexOf(",")) : firstPart;
	
			try {
			return Seconds.seconds(Integer.parseInt(sec.trim()));
			}
			catch (java.lang.NumberFormatException e) {
				System.err.println("Unparseable cache header:" + fullCacheControl);
				return Seconds.seconds(0);
			}
			
		}
		
		else if (fullCacheControl != null && fullCacheControl.contains("no-cache")) {
			return Seconds.ZERO;
		}

		else
			if (expires != null && now!=null)
				return getDelta(now.trim(), expires.trim());
			else
				return Seconds.ZERO;
	}

	public double getDays(Seconds seconds) {
		if (seconds==null)
			return 0;
		int days = seconds.toStandardDays().getDays();
		if (days!=0)
			return days;
		else {
			int hours = seconds.toStandardHours().getHours();
			return (double) Math.round((hours/24.0) * 100) / 100;
		}
	}
	

	private boolean doMaxAgeExist(String fullCacheControl) {
		if (fullCacheControl == null)
			return false;
		else if (fullCacheControl.contains("max-age="))
			return true;
		else
			return false;

	}

}