flink-core-api/src/main/java/org/apache/flink/util/function/CheckedSupplier.java

/*
 * 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.flink.util.function;

import java.util.function.Supplier;

/** Similar to {@link java.util.function.Supplier} but can throw {@link Exception}. */
@FunctionalInterface
public interface CheckedSupplier<R> extends SupplierWithException<R, Exception> {

    static <R> Supplier<R> unchecked(CheckedSupplier<R> checkedSupplier) {
        return () -> {
            try {
                return checkedSupplier.get();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        };
    }

    static <R> CheckedSupplier<R> checked(Supplier<R> supplier) {
        return () -> {
            try {
                return supplier.get();
            } catch (RuntimeException e) {
                throw new Exception(e);
            }
        };
    }
}