| /* |
| * 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.jackrabbit.oak.http; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.tika.mime.MediaType; |
| import org.apache.tika.mime.MediaTypeRegistry; |
| |
| public class MediaRange { |
| |
| private final MediaType type; |
| |
| private final double q; |
| |
| private static final int QRESOLUTION = 1000; |
| private static double CORRECTIONFORSUBTYPEMATCH = 1f / (10 * QRESOLUTION); |
| private static double CORRECTIONFORTYPEANDSUBTYPEMATCH = 2f / (10 * QRESOLUTION); |
| |
| public static MediaRange parse(String range, MediaTypeRegistry registry) { |
| MediaType type = MediaType.parse(range); |
| if (type == null) { |
| return null; |
| } |
| type = registry.normalize(type); |
| |
| Map<String, String> parameters = |
| new HashMap<String, String>(type.getParameters()); |
| String q = parameters.remove("q"); |
| if (q != null) { |
| try { |
| return new MediaRange( |
| new MediaType(type.getBaseType(), parameters), |
| Double.parseDouble(q)); |
| } catch (NumberFormatException e) { |
| return null; |
| } |
| } |
| |
| return new MediaRange(type, 1.0); |
| } |
| |
| public MediaRange(MediaType type, double q) { |
| this.type = type; |
| this.q = q; |
| } |
| |
| /** |
| * Matches the media range against the specified media type. |
| * <p> |
| * The "derived" quality value if computed from the specified q value (0 to |
| * 1) by subtracting 1/10000 in case the subtype in the range is "*", or |
| * 2/10000 if case both type and subtype are. This takes care of the |
| * precedence specified in RFC 7231, Section 5.3.2. |
| * |
| * @param type |
| * type to match |
| * @param registry |
| * media type registry |
| * @return {@code 0.0} for "no match", the derived quality value if match |
| */ |
| public double match(MediaType type, MediaTypeRegistry registry) { |
| if (type.equals(this.type)) { // shortcut |
| return q; |
| } |
| |
| for (Map.Entry<String, String> entry |
| : this.type.getParameters().entrySet()) { |
| String key = entry.getKey(); |
| String value = entry.getValue(); |
| if (!value.equals(type.getParameters().get(key))) { |
| return 0.0; |
| } |
| } |
| |
| if (q > 0.0 && "*/*".equals(this.type.toString())) { |
| return q - CORRECTIONFORTYPEANDSUBTYPEMATCH; |
| } else if (q > 0.0 && "*".equals(this.type.getSubtype()) && type.getType().equals(this.type.getType())) { |
| return q - CORRECTIONFORSUBTYPEMATCH; |
| } else { |
| return 0.0; |
| } |
| } |
| |
| public String toString() { |
| return String.format("type=%s, q=%f", type, q); |
| } |
| } |