001/* 002 * (C) Copyright 2019 Nuxeo (http://nuxeo.com/) and others. 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 * Contributors: 017 * Kevin Leturc <kleturc@nuxeo.com> 018 */ 019package org.nuxeo.common.function; 020 021import java.util.function.Supplier; 022 023/** 024 * @param <T> the type of results supplied by this supplier 025 * @param <E> the type of exception to throw 026 * @since 11.1 027 */ 028@FunctionalInterface 029public interface ThrowableSupplier<T, E extends Throwable> { 030 031 T get() throws E; 032 033 /** 034 * @return this {@link ThrowableSupplier} as a {@link Supplier} throwing the checked exception as an unchecked one 035 */ 036 default Supplier<T> toSupplier() { 037 return asSupplier(this); 038 } 039 040 /** 041 * @return the given {@link ThrowableSupplier} as a {@link Supplier} throwing the checked exception as an unchecked 042 * one 043 */ 044 static <T, E extends Throwable> Supplier<T> asSupplier(ThrowableSupplier<T, E> throwableSupplier) { 045 return () -> { 046 try { 047 return throwableSupplier.get(); 048 } catch (Throwable t) { // NOSONAR 049 return FunctionUtils.sneakyThrow(t); // will never return 050 } 051 }; 052 } 053 054}