001/*
002 * nimbus-jose-jwt
003 *
004 * Copyright 2012-2016, Connect2id Ltd and contributors.
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
007 * this file except in compliance with the License. You may obtain a copy of the
008 * License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software distributed
013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
015 * specific language governing permissions and limitations under the License.
016 */
017
018package com.nimbusds.jose.crypto.opts;
019
020
021import java.util.Set;
022
023import com.nimbusds.jose.JWSSignerOption;
024
025
026/**
027 * Utilities for processing JOSE options.
028 */
029public class OptionUtils {
030        
031        
032        /**
033         * Returns {@code true} if the specified set of options contains an
034         * instance of a class implementing {@link JWSSignerOption}.
035         *
036         * @param opts   The options set, may be {@code null}.
037         * @param tClass The class. Must not be {@code null}.
038         *
039         * @return {@code true} if an option is present, else {@code false}.
040         */
041        public static <T extends JWSSignerOption> boolean optionIsPresent(final Set<JWSSignerOption> opts, final Class<T> tClass) {
042                
043                if (opts == null || opts.isEmpty()) {
044                        return false;
045                }
046                
047                for (JWSSignerOption o: opts) {
048                        
049                        if (o.getClass().isAssignableFrom(tClass)) {
050                                return true;
051                        }
052                }
053                
054                return false;
055        }
056}