com.google.gwt.dev.util.HttpHeaders Maven / Gradle / Ivy
/*
* Copyright 2007 Google Inc.
*
* 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 com.google.gwt.dev.util;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
/**
* HTTP header strings defined by RFCs.
*/
public final class HttpHeaders {
public static final long MS_SEC = 1000;
public static final long MS_MIN = MS_SEC * 60;
public static final long MS_HR = MS_MIN * 60;
public static final long MS_DAY = MS_HR * 24;
public static final long SEC_MIN = 60;
public static final long SEC_HR = SEC_MIN * 60;
public static final long SEC_DAY = SEC_HR * 24;
public static final long SEC_YR = SEC_DAY * 365;
public static final String CACHE_CONTROL = "Cache-Control";
public static final String CACHE_CONTROL_MAXAGE = "max-age=";
public static final String CACHE_CONTROL_MUST_REVALIDATE = "must-revalidate";
public static final String CACHE_CONTROL_NO_CACHE = "no-cache";
public static final String CACHE_CONTROL_PRIVATE = "private";
public static final String CACHE_CONTROL_PUBLIC = "public";
public static final String CONTENT_ENCODING = "Content-Encoding";
public static final String CONTENT_ENCODING_GZIP = "gzip";
public static final String CONTENT_LENGTH = "Content-Length";
public static final String CONTENT_TYPE = "Content-Type";
public static final String CONTENT_TYPE_APPLICATION_XJAVASCRIPT_UTF8 = "application/x-javascript; charset=utf-8";
public static final String CONTENT_TYPE_TEXT_CSS = "text/css";
public static final String CONTENT_TYPE_TEXT_HTML = "text/html";
public static final String CONTENT_TYPE_TEXT_HTML_UTF8 = "text/html; charset=utf-8";
public static final String CONTENT_TYPE_TEXT_PLAIN = "text/plain";
public static final String DATE = "Date";
public static final String ETAG = "ETag";
public static final String EXPIRES = "Expires";
public static final String IF_MODIFIED_SINCE = "If-Modified-Since";
public static final String IF_NONE_MATCH = "If-None-Match";
public static final String LAST_MODIFIED = "Last-Modified";
/**
* The Internet date format for HTTP.
*/
private static DateFormat sHttpDateFormat = new SimpleDateFormat(
"EEE, d MMM yyyy HH:mm:ss", Locale.US);
/**
* Converts an HTTP date string into a file-style date/time.
*/
public static long fromInternetDateFormat(String timeStr) {
Date dateGmt;
try {
synchronized (sHttpDateFormat) {
dateGmt = sHttpDateFormat.parse(timeStr);
}
} catch (ParseException e) {
return 0;
}
dateGmt = gmtToDate(dateGmt);
return dateGmt.getTime();
}
/**
* Converts a file-style date/time into a string form that is compatible with
* HTTP.
*/
public static String toInternetDateFormat(long time) {
Date date = dateToGMT(new Date(time));
String dateGmt;
synchronized (sHttpDateFormat) {
dateGmt = sHttpDateFormat.format(date) + " GMT";
}
return dateGmt;
}
/**
* Converts a local date to GMT.
*
* @param date the date in the local time zone
* @return the GMT version
*/
private static Date dateToGMT(Date date) {
Calendar cal = Calendar.getInstance();
long tzMillis = cal.get(Calendar.ZONE_OFFSET)
+ cal.get(Calendar.DST_OFFSET);
return new Date(date.getTime() - tzMillis);
}
/**
* Converts a GMT into a local date.
*
* @param date the date in GMT
* @return the local time zone version
*/
private static Date gmtToDate(Date date) {
Calendar cal = Calendar.getInstance();
long tzMillis = cal.get(Calendar.ZONE_OFFSET)
+ cal.get(Calendar.DST_OFFSET);
return new Date(date.getTime() + tzMillis);
}
}