#245: Equals

src/main/java/org/cactoos/func/Equals.java

@@ -0,0 +1,64 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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.func;
+
+import org.cactoos.Scalar;
+
+/**
+ * Negative.
+ *
+ * <p>There is no thread-safety guarantee.
+ *
+ * @author Fabricio Cabral ([email protected])
+ * @version $Id$
+ * @param <T> Type of object to compare
+ * @since 0.9
+ */
+public final class Equals<T extends Comparable<T>> implements Scalar<Boolean> {
+
+    /**
+     * The left scalar.
+     */
+    private final Scalar<T> left;
+
+    /**
+     * The right scalar.
+     */
+    private final Scalar<T> right;
+
+    /**
+     * Ctor.
+     * @param lft The first scalar to compare.
+     * @param rght The second scalar to compare.
+     */
+    public Equals(final Scalar<T> lft, final Scalar<T> rght) {
+        this.left = lft;
+        this.right = rght;
+    }
+
+    @Override
+    public Boolean value() throws Exception {
+        return this.left.value().compareTo(this.right.value()) == 0;
+    }
+}

src/test/java/org/cactoos/func/EqualsTest.java

@@ -0,0 +1,88 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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.func;
+
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+/**
+ * Test case for {@link Equals}.
+ *
+ * @author Fabricio Cabral ([email protected])
+ * @version $Id$
+ * @since 0.9
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class EqualsTest {
+
+    @Test
+    public void compareEquals() throws Exception {
+        MatcherAssert.assertThat(
+            "Can't compare if two integers are equals",
+            new Equals<>(
+                () -> new Integer(1),
+                () -> new Integer(1)
+            ).value(),
+            Matchers.equalTo(true)
+        );
+    }
+
+    @Test
+    public void compareNotEquals() throws Exception {
+        MatcherAssert.assertThat(
+            "Can't compare if two integers are not equals",
+            new Equals<>(
+                () -> new Integer(1),
+                () -> new Integer(2)
+            ).value(),
+            Matchers.equalTo(false)
+        );
+    }
+
+    @Test
+    public void compareEqualsText() throws Exception {
+        final String str = "hello";
+        MatcherAssert.assertThat(
+            "Can't compare if two strings are equals",
+            new Equals<>(
+                () -> str,
+                () -> str
+            ).value(),
+            Matchers.equalTo(true)
+        );
+    }
+
+    @Test
+    public void compareNotEqualsText() throws Exception {
+        MatcherAssert.assertThat(
+            "Can't compare if two strings are not equals",
+            new Equals<>(
+                () -> "world",
+                () -> "worle"
+            ).value(),
+            Matchers.equalTo(false)
+        );
+    }
+}