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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.ref;

import static functionalj.ref.WhenAbsent.UseDefault;

import java.util.function.Supplier;

import functionalj.function.Func0;
import functionalj.result.Result;
import lombok.val;

public class RefBuilder {
    
    private final Class    dataClass;
    private final Supplier elseSupplier;
    
    RefBuilder(Class dataClass) {
        this(dataClass, null);
    }
    RefBuilder(Class dataClass, Supplier elseSupplier) {
        this.dataClass    = dataClass;
        this.elseSupplier = elseSupplier;
    }
    
    public Ref orTypeDefault() {
        return orTypeDefaultOrGet(null);
    }
    public Ref orTypeDefaultOrGet(Supplier manualDefault) {
        return defaultToTypeDefault()
                .whenAbsentUseDefaultOrGet(manualDefault);
    }
    
    public RefBuilder whenAbsentUse(DATA defaultValue) {
        return new RefBuilder(dataClass, WhenAbsent.Use(defaultValue));
    }
    public RefBuilder whenAbsentGet(Supplier defaultSupplier) {
        return new RefBuilder(dataClass, WhenAbsent.Get(defaultSupplier));
    }
    public RefBuilder whenAbsentUseTypeDefault() {
        return new RefBuilder(dataClass, WhenAbsent.UseDefault(dataClass));
    }
    
    public Ref defaultToNull() {
        @SuppressWarnings("unchecked")
        val result = (Result)Result.ofNull();
        val ref    = new RefOf.FromResult<>(dataClass, result, elseSupplier);
        return ref;
    }
    public Ref defaultTo(DATA value) {
        val result = Result.valueOf(value);
        val ref    = new RefOf.FromResult<>(dataClass, result, elseSupplier);
        return ref;
    }
    public Ref defaultFrom(Ref anotherRef) {
        val ref = new RefOf.FromRef(dataClass, anotherRef, elseSupplier);
        return ref;
    }
    public Ref defaultFrom(Func0 supplier) {
        val ref = new RefOf.FromSupplier(dataClass, supplier, elseSupplier);
        return ref;
    }
    public Ref defaultToTypeDefault() {
        return new RefBuilder(dataClass, UseDefault(dataClass))
                .defaultFrom(UseDefault(dataClass));
    }
    
    
    public Ref dictateToNull() {
        val ref = defaultToNull();
        return ref.dictate();
    }
    public Ref dictateTo(DATA value) {
        val ref = defaultTo(value);
        return ref.dictate();
    }
    public Ref dictateFrom(Func0 supplier) {
        val ref = defaultFrom(supplier);
        return ref.dictate();
    }
    
}