| /* |
| * 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.myfaces.core.api.shared; |
| |
| /** |
| * <p> |
| * This is a stripped down version of: org.apache.myfaces.util.ExternalSpecifications |
| * </p> |
| * @since 2.0 |
| */ |
| public final class ExternalSpecifications |
| { |
| private static volatile Boolean beanValidationAvailable; |
| |
| /** |
| * This method determines if Bean Validation is present. |
| * |
| * Eager initialization is used for performance. This means Bean Validation binaries |
| * should not be added at runtime after this variable has been set. |
| * @return true if Bean Validation is available, false otherwise. |
| */ |
| public static boolean isBeanValidationAvailable() |
| { |
| if (beanValidationAvailable == null) |
| { |
| try |
| { |
| try |
| { |
| beanValidationAvailable = (Class.forName("javax.validation.Validation") != null); |
| } |
| catch(ClassNotFoundException e) |
| { |
| beanValidationAvailable = Boolean.FALSE; |
| } |
| |
| if (beanValidationAvailable) |
| { |
| try |
| { |
| // Trial-error approach to check for Bean Validation impl existence. |
| // If any Exception occurs here, we assume that Bean Validation is not available. |
| // The cause may be anything, i.e. NoClassDef, config error... |
| BeanValidationUtils.tryBuildDefaultValidatorFactory(); |
| } |
| catch (Throwable t) |
| { |
| beanValidationAvailable = false; |
| } |
| } |
| } |
| catch (Throwable t) |
| { |
| beanValidationAvailable = false; |
| } |
| } |
| return beanValidationAvailable; |
| } |
| |
| /** |
| * this class should not be instantiated. |
| */ |
| private ExternalSpecifications() |
| { |
| } |
| } |