| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.http.functions; |
| 20 | |
| 21 | import static org.jclouds.http.HttpUtils.releasePayload; |
| 22 | |
| 23 | import javax.inject.Singleton; |
| 24 | import javax.ws.rs.core.HttpHeaders; |
| 25 | |
| 26 | import org.jclouds.http.HttpException; |
| 27 | import org.jclouds.http.HttpResponse; |
| 28 | |
| 29 | import com.google.common.base.Function; |
| 30 | |
| 31 | /** |
| 32 | * Parses an MD5 checksum from the header {@link HttpHeaders#ETAG}. |
| 33 | * |
| 34 | * @author Adrian Cole |
| 35 | */ |
| 36 | @Singleton |
| 37 | public class ParseETagHeader implements Function<HttpResponse, String> { |
| 38 | |
| 39 | public String apply(HttpResponse from) { |
| 40 | releasePayload(from); |
| 41 | String eTag = from.getFirstHeaderOrNull(HttpHeaders.ETAG); |
| 42 | if (eTag == null) { |
| 43 | // TODO: Cloud Files sends incorrectly cased ETag header... Remove this when fixed. |
| 44 | eTag = from.getFirstHeaderOrNull("Etag"); |
| 45 | } |
| 46 | if (eTag != null) { |
| 47 | return eTag; |
| 48 | } |
| 49 | throw new HttpException("did not receive ETag"); |
| 50 | } |
| 51 | |
| 52 | } |