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Functional Reactive with Core Java

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/**
 * Copyright © 2017 Sven Ruppert ([email protected])
 *
 * Licensed 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.rapidpm.frp.functions;

import static org.rapidpm.frp.ExceptionFunctions.message;

import java.util.function.Supplier;

import org.rapidpm.frp.model.Result;

/**
 * Created by svenruppert on 25.04.17.
 */
@FunctionalInterface
public interface CheckedSupplier extends Supplier> {

  @Override
  default Result get() {
    try {
      return Result.success(getWithException());
    } catch (Exception e) {
      return Result.failure(message().apply(e));
    }
  }

  T getWithException() throws Exception;

  default T getOrElse(Supplier supplier) {
    return get().getOrElse(supplier);
  }
}