| /* |
| * 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.olingo.server.api; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * HttpHeader container for internal use in this package. |
| * @see ODataRequest |
| * @see ODataResponse |
| */ |
| final class HttpHeaders { |
| private final Map<String, List<String>> headers = new LinkedHashMap<>(); |
| |
| /** |
| * Adds a header with given name and value. |
| * If a header with that name already exists the value is added to this header. |
| * @param name name of header |
| * @param value value for header |
| * @return this container (fluent interface) |
| */ |
| public HttpHeaders addHeader(final String name, final String value) { |
| final String canonicalName = getCanonicalName(name); |
| List<String> header = headers.get(canonicalName); |
| if (header == null) { |
| header = new ArrayList<>(); |
| } |
| header.add(value); |
| headers.put(canonicalName, header); |
| return this; |
| } |
| |
| /** |
| * Adds a header with the given name and values. |
| * If a header with that name already exists the values are added to this header. |
| * @param name name of header |
| * @param values values for header |
| * @return this container (fluent interface) |
| */ |
| public HttpHeaders addHeader(final String name, final List<String> values) { |
| final String canonicalName = getCanonicalName(name); |
| List<String> header = headers.get(canonicalName); |
| if (header == null) { |
| header = new ArrayList<>(); |
| } |
| header.addAll(values); |
| headers.put(canonicalName, header); |
| return this; |
| } |
| |
| /** |
| * Set a header with given name and value. |
| * If a header with that name already exists the old header is replaced with the new one. |
| * @param name name of header |
| * @param value value for header |
| * @return this container (fluent interface) |
| */ |
| public HttpHeaders setHeader(final String name, final String value) { |
| removeHeader(name); |
| addHeader(name, value); |
| return this; |
| } |
| |
| /** |
| * Gets header values for the given name. |
| * @param name name of header requested |
| * @return corresponding header values or null if no values have been found |
| */ |
| public List<String> getHeader(final String name) { |
| final List<String> values = headers.get(getCanonicalName(name)); |
| return values == null || values.isEmpty() ? null : Collections.unmodifiableList(values); |
| } |
| |
| /** |
| * Removes header of the given name. |
| * @param name name of header to be removed |
| * @return removed header values or null if no header was known for this name |
| */ |
| public List<String> removeHeader(final String name) { |
| return headers.remove(getCanonicalName(name)); |
| } |
| |
| /** |
| * Gets all headers with the according values. |
| * @return an unmodifiable Map of header names/values or an empty collection if no headers have been set |
| */ |
| public Map<String, List<String>> getHeaderToValues() { |
| return headers.isEmpty() ? Collections.<String, List<String>> emptyMap() : Collections.unmodifiableMap(headers); |
| } |
| |
| /** |
| * Gets all header names. |
| * @return all header names or an empty collection if no headers have been set |
| */ |
| public Collection<String> getHeaderNames() { |
| return headers.isEmpty() ? Collections.<String> emptySet() : Collections.unmodifiableSet(headers.keySet()); |
| } |
| |
| /** |
| * The canonical form of a header name is the already-used form regarding case, |
| * enabling applications to have pretty-looking headers instead of getting them |
| * converted to all lowercase. |
| * @param name HTTP header name |
| */ |
| private String getCanonicalName(final String name) { |
| for (final String headerName : headers.keySet()) { |
| if (headerName.equalsIgnoreCase(name)) { |
| return headerName; |
| } |
| } |
| return name; |
| } |
| } |