| // *************************************************************************************************************************** |
| // * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * |
| // * distributed with this work for additional information regarding copyright ownership. The ASF 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.apache.juneau.http; |
| |
| import org.apache.juneau.http.annotation.*; |
| |
| /** |
| * Represents a parsed <l>ETag</l> HTTP response header. |
| * |
| * <p> |
| * An identifier for a specific version of a resource, often a message digest. |
| * |
| * <h5 class='figure'>Example</h5> |
| * <p class='bcode w800'> |
| * ETag: "737060cd8c284d8af7ad3082f209582d" |
| * </p> |
| * |
| * <h5 class='topic'>RFC2616 Specification</h5> |
| * |
| * The ETag response-header field provides the current value of the entity tag for the requested variant. |
| * The headers used with entity tags are described in sections 14.24, 14.26 and 14.44. |
| * The entity tag MAY be used for comparison with other entities from the same resource (see section 13.3.3). |
| * |
| * <p class='bcode w800'> |
| * ETag = "ETag" ":" entity-tag |
| * </p> |
| * |
| * <p> |
| * Examples: |
| * <p class='bcode w800'> |
| * ETag: "xyzzy" |
| * ETag: W/"xyzzy" |
| * ETag: "" |
| * </p> |
| * |
| * <ul class='seealso'> |
| * <li class='extlink'>{@doc RFC2616} |
| * </ul> |
| */ |
| @Header("ETag") |
| public final class ETag extends HeaderString { |
| |
| /** |
| * Returns a parsed <c>ETag</c> header. |
| * |
| * @param value The <c>ETag</c> header string. |
| * @return The parsed <c>ETag</c> header, or <jk>null</jk> if the string was null. |
| */ |
| public static ETag forString(String value) { |
| if (value == null) |
| return null; |
| return new ETag(value); |
| } |
| |
| private ETag(String value) { |
| super(value); |
| } |
| } |