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The module for FunctionalJ Core.

There is a newer version: 1.0.17

// ============================================================================
// Copyright (c) 2017-2021 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.promise;

import java.util.function.Function;

import functionalj.result.Result;
import lombok.val;

class DeferValueHelper {
    @SuppressWarnings({ "unchecked", "rawtypes" })
    static public  DeferValue mapResult(
            DeferValue                                              originalLater, 
            Function, Result> mapper) {
        val resultLater   = (originalLater instanceof NamedDeferValue) 
                          ? new DeferValue(originalLater).named(((NamedDeferValue)originalLater).name())
                          : new DeferValue(originalLater);
        originalLater.onComplete(result -> {
            val finalResult = mapper.apply(result);
            Promise.makeDone(resultLater, (Result)finalResult);
        });
        return resultLater;
    }
}