functionalj.lens.lenses.ResultLens Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of functionalj-core Show documentation
The module for FunctionalJ Core.
There is a newer version: 1.0.17
// ============================================================================
// Copyright (c) 2017-2019 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.lens.lenses;

import static functionalj.lens.core.LensUtils.createLensSpecParameterized;

import java.util.function.Function;

import functionalj.lens.core.AccessParameterized;
import functionalj.lens.core.LensSpec;
import functionalj.lens.core.LensSpecParameterized;
import functionalj.lens.core.WriteLens;
import functionalj.result.Result;
import lombok.val;

@FunctionalInterface
public interface ResultLens>
        extends 
            ObjectLens>,
            ResultAccess {
    
    public static >
        ResultLens of(
            LensSpec> resultLensSpec,
            Function, SUBLENS> subCreator) {
        val read  = resultLensSpec.getRead();
        val write = resultLensSpec.getWrite();
        val spec  = createLensSpecParameterized(read, write, subCreator);
        val nullableLens = (ResultLens)()->spec;
        return nullableLens;
    }
    
    
    public LensSpecParameterized, TYPE, SUBLENS> lensSpecWithSub();
    
    @Override
    default AccessParameterized, TYPE, SUBLENS> accessWithSub() {
        return lensSpecWithSub();
    }
    
    @Override
    public default SUBLENS createSubAccess(Function, TYPE> accessToSub) {
        return lensSpecWithSub().createSubAccess(accessToSub);
    }
    
    @Override
    public default LensSpec> lensSpec() {
        return lensSpecWithSub().getSpec();
    }
    
    @Override
    public default Result applyUnsafe(HOST host) throws Exception {
        return lensSpec().getRead().apply(host);
    }
    
    public default SUBLENS get() {
        WriteLens write = (HOST host, TYPE newValue)->{
            return lensSpec().getWrite().apply(host, Result.valueOf(newValue));
        };
        LensSpec subSpec = LensSpec.of(lensSpec().getRead().andThen(Result::get), write);
        return lensSpecWithSub().createSubLens(subSpec);
    }
    
    public default SUBLENS value() {
        WriteLens write = (HOST host, TYPE newValue)->{
            return lensSpec().getWrite().apply(host, Result.valueOf(newValue));
        };
        LensSpec subSpec = LensSpec.of(lensSpec().getRead().andThen(Result::get), write);
        return lensSpecWithSub().createSubLens(subSpec);
    }

}