Added Capitalized

src/main/java/org/cactoos/text/Capitalized.java

@@ -0,0 +1,66 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2020 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.text;
+
+import org.cactoos.Text;
+
+/**
+ * Text in capitalized case, changed the first character to title case, no other
+ * characters are changed.
+ *
+ * @since 0.46
+ */
+public class Capitalized extends TextEnvelope {
+
+    /**
+     * Ctor.
+     *
+     * @param text The text
+     */
+    public Capitalized(final String text) {
+        this(new TextOf(text));
+    }
+
+    /**
+     * Ctor.
+     *
+     * @param text The text
+     */
+    public Capitalized(final Text text) {
+        super(
+            new TextOf(
+                () -> {
+                    String capitalized = text.asString();
+                    if (!capitalized.isEmpty()) {
+                        final Text first = new Sub(capitalized, 0, 1);
+                        final Text upper = new Upper(first);
+                        if (!upper.equals(first)) {
+                            capitalized = new StringBuilder().append(upper).append(new Sub(text, 1))
+                                .toString();
+                        }
+                    }
+                    return capitalized;
+                }));
+    }
+}

src/test/java/org/cactoos/text/CapitalizedTest.java

@@ -0,0 +1,93 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2020 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.text;
+
+import org.junit.Test;
+import org.llorllale.cactoos.matchers.Assertion;
+import org.llorllale.cactoos.matchers.TextIs;
+
+/**
+ * Test case for {@link Capitalized}.
+ * @since 0.46
+ */
+public class CapitalizedTest {
+    /**
+     * Text starting with upper case character.
+     */
+    private static final String UPPER_CASE = "Abc";
+
+    @Test
+    public void capitalizeEmptyText() {
+        new Assertion<>(
+            "Can't capitalize an empty text",
+            new Capitalized(new TextOf("")),
+            new TextIs("")
+        ).affirm();
+    }
+
+    @Test
+    public void capitalizeSingleLowerCaseText() {
+        new Assertion<>(
+            "Can't capitalize single lower case text",
+            new Capitalized(new TextOf("f")),
+            new TextIs("F")
+        ).affirm();
+    }
+
+    @Test
+    public void capitalizeSingleUpperCaseText() {
+        new Assertion<>(
+            "Can't capitalize single upper case text",
+            new Capitalized(new TextOf("F")),
+            new TextIs("F")
+        ).affirm();
+    }
+
+    @Test
+    public void capitalizeTextStartingWithUpperCaseCharacter() {
+        new Assertion<>(
+            "Can't capitalize text starting with upper case character",
+            new Capitalized(new TextOf(CapitalizedTest.UPPER_CASE)),
+            new TextIs(CapitalizedTest.UPPER_CASE)
+        ).affirm();
+    }
+
+    @Test
+    public void capitalizeTextStartingWithLowerCaseCharacter() {
+        new Assertion<>(
+            "Can't capitalize text starting with lower case character",
+            new Capitalized(new TextOf("xyz")),
+            new TextIs("Xyz")
+        ).affirm();
+    }
+
+    @Test
+    public void capitalizeString() {
+        new Assertion<>(
+            "Can't capitalize string",
+            new Capitalized("foo"),
+            new TextIs("Foo")
+        ).affirm();
+    }
+}