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cas-server-support-webauthn-core
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// Copyright (c) 2018, Yubico AB
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.yubico.util;
import java.util.Optional;
import java.util.function.Function;
public final class Either {
private final boolean isRight;
private final L leftValue;
private final R rightValue;
private Either(final R rightValue) {
this.isRight = true;
this.leftValue = null;
this.rightValue = rightValue;
}
private Either(@SuppressWarnings("UnusedVariable") final boolean unused, final L leftValue) {
this.isRight = false;
this.leftValue = leftValue;
this.rightValue = null;
}
public static Either left(final L value) {
return new Either<>(false, value);
}
public static Either right(final R value) {
return new Either<>(value);
}
public boolean isLeft() {
return !isRight();
}
public boolean isRight() {
return isRight;
}
public Optional left() {
if (isLeft()) {
return Optional.of(leftValue);
} else {
throw new IllegalStateException("Cannot call left() on a right value.");
}
}
public Optional right() {
if (isRight()) {
return Optional.of(rightValue);
} else {
throw new IllegalStateException("Cannot call right() on a left value.");
}
}
public Either map(final Function func) {
return flatMap(r -> Either.right(func.apply(r)));
}
public Either flatMap(final Function> func) {
if (isRight()) {
return func.apply(rightValue);
} else {
return Either.left(leftValue);
}
}
}
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