001/* 002 * nimbus-jose-jwt 003 * 004 * Copyright 2012-2016, Connect2id Ltd. 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.bc; 019 020 021import org.bouncycastle.jce.provider.BouncyCastleProvider; 022 023 024/** 025 * BouncyCastle JCA provider singleton, intended to prevent memory leaks by 026 * ensuring a single instance is loaded at all times. Application code that 027 * needs a BouncyCastle JCA provider should use the {@link #getInstance()} 028 * method to obtain an instance. 029 * 030 * @author Vladimir Dzhuvinov 031 */ 032public final class BouncyCastleProviderSingleton { 033 034 035 /** 036 * The BouncyCastle provider, lazily instantiated. 037 */ 038 private static BouncyCastleProvider bouncyCastleProvider; 039 040 041 /** 042 * Prevents external instantiation. 043 */ 044 private BouncyCastleProviderSingleton() { } 045 046 047 /** 048 * Returns a BouncyCastle JCA provider instance. 049 * 050 * @return The BouncyCastle JCA provider instance. 051 */ 052 public static BouncyCastleProvider getInstance() { 053 054 if (bouncyCastleProvider != null) { 055 056 return bouncyCastleProvider; 057 058 } else { 059 bouncyCastleProvider = new BouncyCastleProvider(); 060 return bouncyCastleProvider; 061 } 062 } 063}