diff --git a/src/main/java/org/cactoos/scalar/Equality.java b/src/main/java/org/cactoos/scalar/Equality.java new file mode 100644 index 0000000000..3771d94537 --- /dev/null +++ b/src/main/java/org/cactoos/scalar/Equality.java @@ -0,0 +1,83 @@ +/** + * The MIT License (MIT) + * + * Copyright (c) 2017-2018 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.Bytes; +import org.cactoos.Scalar; + +/** + * Equality. + * + *

There is no thread-safety guarantee. + * + * @author Vedran Vatavuk (123vgv@gmail.com) + * @version $Id$ + * @param Type of result + * @since 0.30.1 + */ +public final class Equality implements Scalar { + + /** + * Left. + */ + private final T left; + + /** + * Right. + */ + private final T right; + + /** + * Ctor. + * @param lft Left + * @param rght Right + */ + public Equality(final T lft, final T rght) { + this.left = lft; + this.right = rght; + } + + @Override + public Integer value() throws Exception { + final byte[] lft = this.left.asBytes(); + final byte[] rght = this.right.asBytes(); + int result = 0; + final int max = Math.max(lft.length, rght.length); + for (int idx = 0; idx < max; ++idx) { + if (idx >= lft.length) { + result = -1; + break; + } + if (idx >= rght.length) { + result = 1; + break; + } + result = lft[idx] - rght[idx]; + if (result != 0) { + break; + } + } + return (int) Math.signum(result); + } +} diff --git a/src/test/java/org/cactoos/scalar/EqualityTest.java b/src/test/java/org/cactoos/scalar/EqualityTest.java new file mode 100644 index 0000000000..9f7df16ea4 --- /dev/null +++ b/src/test/java/org/cactoos/scalar/EqualityTest.java @@ -0,0 +1,121 @@ +/** + * The MIT License (MIT) + * + * Copyright (c) 2017-2018 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 java.nio.ByteBuffer; +import org.cactoos.Bytes; +import org.hamcrest.MatcherAssert; +import org.hamcrest.Matchers; +import org.junit.Test; + +/** + * Test case for {@link Equality}. + * @author Vedran Vatavuk (123vgv@gmail.com) + * @version $Id$ + * @since 0.30.1 + * @checkstyle JavadocMethodCheck (500 lines) + * @checkstyle MagicNumberCheck (500 lines) + */ +public final class EqualityTest { + + @Test + public void notEqualLeft() throws Exception { + MatcherAssert.assertThat( + new Equality<>( + new EqualityTest.Weight(0), new EqualityTest.Weight(500) + ).value(), + Matchers.equalTo(-1) + ); + } + + @Test + public void notEqualRight() throws Exception { + MatcherAssert.assertThat( + new Equality<>( + new EqualityTest.Weight(500), new EqualityTest.Weight(0) + ).value(), + Matchers.equalTo(1) + ); + } + + @Test + public void notEqualLeftWithSameSize() throws Exception { + MatcherAssert.assertThat( + new Equality<>( + new EqualityTest.Weight(400), new EqualityTest.Weight(500) + ).value(), + Matchers.equalTo(-1) + ); + } + + @Test + public void notEqualRightWithSameSize() throws Exception { + MatcherAssert.assertThat( + new Equality<>( + new EqualityTest.Weight(500), new EqualityTest.Weight(400) + ).value(), + Matchers.equalTo(1) + ); + } + + @Test + public void equal() throws Exception { + MatcherAssert.assertThat( + new Equality<>( + new EqualityTest.Weight(500), new EqualityTest.Weight(500) + ).value(), + Matchers.equalTo(0) + ); + } + + /** + * Weight. + */ + private static final class Weight implements Bytes { + + /** + * Kilos. + */ + private final int kilos; + + /** + * Ctor. + * @param kls Kilos + */ + Weight(final int kls) { + this.kilos = kls; + } + + @Override + public byte[] asBytes() { + return new UncheckedScalar<>( + new Ternary<>( + this.kilos == 0, + new byte[]{}, + ByteBuffer.allocate(4).putInt(this.kilos).array() + ) + ).value(); + } + } +}