001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.fcrepo.kernel.api.utils; 018 019import java.util.function.Predicate; 020 021import javax.jcr.RepositoryException; 022 023import org.fcrepo.kernel.api.exception.RepositoryRuntimeException; 024 025/** 026 * Operations that throw {@link RepositoryException} cannot be used as lambdas without "unchecking" those exceptions. 027 * 028 * @author ajs6f 029 * @param <T> the type of the input to the predicate 030 */ 031@FunctionalInterface 032public interface UncheckedPredicate<T> extends Predicate<T> { 033 034 @Override 035 default boolean test(final T elem) { 036 try { 037 return testThrows(elem); 038 } catch (final RepositoryException e) { 039 throw new RepositoryRuntimeException(e); 040 } 041 } 042 043 /** 044 * The same semantic as {@link #test(Object)}, but allowed to throw a {@link RepositoryException} 045 * 046 * @param elem the input argument 047 * @return true if the input matches the predicate, otherwise false 048 * @throws RepositoryException a repository-related exception 049 */ 050 boolean testThrows(T elem) throws RepositoryException; 051 052 /** 053 * @param <T> the type of the input to the predicate 054 * @param p a lambda expression 055 * @return an unchecked version of that lambda 056 */ 057 static <T> UncheckedPredicate<T> uncheck(final UncheckedPredicate<T> p) { 058 return p; 059 } 060}