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A general programming library in Java
There is a newer version: 1.10.1
/*
 * Copyright (c) 2017, Haiyang Li.
 * 
 * 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 com.landawn.abacus.util;

import java.util.NoSuchElementException;
import java.util.Objects;

import com.landawn.abacus.util.function.Supplier;
import com.landawn.abacus.util.stream.ByteStream;

public final class OptionalByte implements Comparable {
    private static final OptionalByte EMPTY = new OptionalByte();

    private final byte value;
    private final boolean isPresent;

    private OptionalByte() {
        this.value = 0;
        this.isPresent = false;
    }

    private OptionalByte(byte value) {
        this.value = value;
        this.isPresent = true;
    }

    public static OptionalByte empty() {
        return EMPTY;
    }

    public static OptionalByte of(byte value) {
        return new OptionalByte(value);
    }

    public static OptionalByte ofNullable(Byte val) {
        if (val == null) {
            return empty();
        } else {
            return OptionalByte.of(val);
        }
    }

    public byte get() throws NoSuchElementException {
        return orElseThrow();
    }

    public boolean isPresent() {
        return isPresent;
    }

    public  OptionalByte ifPresent(Try.ByteConsumer action) throws E {
        Objects.requireNonNull(action);

        if (isPresent) {
            action.accept(value);
        }

        return this;
    }

    public  OptionalByte ifPresentOrElse(Try.ByteConsumer action, Try.Runnable emptyAction) throws E, E2 {
        Objects.requireNonNull(action);
        Objects.requireNonNull(emptyAction);

        if (isPresent) {
            action.accept(value);
        } else {
            emptyAction.run();
        }

        return this;
    }

    public  OptionalByte filter(Try.BytePredicate predicate) throws E {
        Objects.requireNonNull(predicate);

        if (isPresent && predicate.test(value)) {
            return this;
        } else {
            return empty();
        }
    }

    public  OptionalByte map(final Try.ByteUnaryOperator mapper) throws E {
        Objects.requireNonNull(mapper);

        if (isPresent) {
            return OptionalByte.of(mapper.applyAsByte(value));
        } else {
            return empty();
        }
    }

    public  OptionalInt mapToInt(final Try.ToIntFunction mapper) throws E {
        Objects.requireNonNull(mapper);

        if (isPresent) {
            return OptionalInt.of(mapper.applyAsInt(value));
        } else {
            return OptionalInt.empty();
        }
    }

    public  Nullable mapToObj(final Try.ByteFunction mapper) throws E {
        Objects.requireNonNull(mapper);

        if (isPresent) {
            return Nullable.of(mapper.apply(value));
        } else {
            return Nullable. empty();
        }
    }

    public  OptionalByte flatMap(Try.ByteFunction mapper) throws E {
        Objects.requireNonNull(mapper);

        if (isPresent) {
            return Objects.requireNonNull(mapper.apply(value));
        } else {
            return empty();
        }
    }

    public  OptionalByte or(Try.Supplier supplier) throws E {
        if (isPresent) {
            return this;
        } else {
            return Objects.requireNonNull(supplier.get());
        }
    }

    public byte orZero() {
        return isPresent ? value : 0;
    }

    //    public byte orElseZero() {
    //        return isPresent ? value : 0;
    //    }

    public byte orElseThrow() throws NoSuchElementException {
        if (isPresent) {
            return value;
        } else {
            throw new NoSuchElementException("No value present");
        }
    }

    public byte orElse(byte other) {
        return isPresent ? value : other;
    }

    public  byte orElseGet(Try.ByteSupplier other) throws E {
        Objects.requireNonNull(other);

        if (isPresent) {
            return value;
        } else {
            return other.getAsByte();
        }
    }

    public  byte orElseThrow(Supplier exceptionSupplier) throws X {
        Objects.requireNonNull(exceptionSupplier);

        if (isPresent) {
            return value;
        } else {
            throw exceptionSupplier.get();
        }
    }

    @Override
    public int compareTo(OptionalByte optional) {
        if (optional == null || optional.isPresent == false) {
            return isPresent ? 1 : 0;
        }

        if (isPresent == false) {
            return -1;
        }

        return Byte.compare(this.get(), optional.get());
    }

    public ByteStream stream() {
        if (isPresent) {
            return ByteStream.of(value);
        } else {
            return ByteStream.empty();
        }
    }

    public Optional boxed() {
        if (isPresent) {
            return Optional.of(value);
        } else {
            return Optional. empty();
        }
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (obj instanceof OptionalByte) {
            final OptionalByte other = (OptionalByte) obj;

            return (isPresent && other.isPresent) ? value == other.value : isPresent == other.isPresent;
        }

        return false;
    }

    @Override
    public int hashCode() {
        return N.hashCode(isPresent) * 31 + N.hashCode(value);
    }

    @Override
    public String toString() {
        if (isPresent) {
            return String.format("OptionalByte[%s]", value);
        }

        return "OptionalByte.empty";
    }
}