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h1alexbel committed Sep 11, 2023
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80 changes: 80 additions & 0 deletions src/main/java/org/cactoos/scalar/ThrowsOnFalse.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017-2022 Yegor Bugayenko
*
* 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 NON-INFRINGEMENT. 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 org.cactoos.scalar;

import org.cactoos.Scalar;

/**
* Throws an exception on false expression.
*
* @since 0.56.0
*/
public final class ThrowsOnFalse implements Scalar<Boolean> {

/**
* Logical statement.
*/
private final Scalar<Boolean> scalar;

/**
* Exception to throw.
*/
private final Scalar<Exception> exception;

/**
* Ctor.
* @param sclr Scalar
* @param message Error Message
*/
public ThrowsOnFalse(
final Scalar<Boolean> sclr,
final String message
) {
this(
sclr, () -> new IllegalArgumentException(message)
);
}

/**
* Ctor.
* @param sclr Scalar
* @param exc Exception
*/
public ThrowsOnFalse(
final Scalar<Boolean> sclr,
final Scalar<Exception> exc
) {
this.scalar = sclr;
this.exception = exc;
}

@Override
public Boolean value() throws Exception {
if (!this.scalar.value()) {
throw this.exception.value();
}
return true;
}
}
72 changes: 72 additions & 0 deletions src/test/java/org/cactoos/scalar/ThrowsOnFalseTest.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017-2022 Yegor Bugayenko
*
* 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 NON-INFRINGEMENT. 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 org.cactoos.scalar;

import org.hamcrest.core.IsEqual;
import org.junit.Test;
import org.llorllale.cactoos.matchers.Assertion;
import org.llorllale.cactoos.matchers.Throws;

/**
* Test suite for {@link ThrowsOnFalse}.
*
* @since 0.56.0
*/
public final class ThrowsOnFalseTest {

@Test
public void throwsOnFalse() throws Exception {
final String message = "test message";
new Assertion<>(
"Throws an exception",
() -> new ThrowsOnFalse(
() -> false, message
).value(),
new Throws<>(message, IllegalArgumentException.class)
).affirm();
}

@Test
public void throwsSuppliedExceptionOnFalse() throws Exception {
final String message = "illegal state";
new Assertion<>(
"Throws supplied exception",
() -> new ThrowsOnFalse(
() -> false,
() -> new IllegalStateException(message)
).value(),
new Throws<>(message, IllegalStateException.class)
).affirm();
}

@Test
public void returnsTrueOnTrue() throws Exception {
new Assertion<>(
"Must return true on true statement",
new ThrowsOnFalse(() -> true, "test").value(),
new IsEqual<>(true)
).affirm();
}
}

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