Merge branch '__rultor'

README.md

@@ -241,6 +241,7 @@ Cactoos | Guava | Apache Commons | JDK 8
 `RepeatedText` | - | `StringUtils.repeat()` | -
 `ReplacedText` | - | - | `String#replace()`
 `ReversedText` | - | - | `StringBuilder#reverse()`
+`RotatedText` | - | `StringUtils.rotate()`| -
 `SplitText` | - | - | `String#split()`
 `EncodedUrl` | - | - | `URLEncoder.encode()`
 `SubText` | - | - | `String#substring()`

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

@@ -0,0 +1,81 @@
+/**
+ * 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.text;
+
+import java.io.IOException;
+import org.cactoos.Text;
+
+/**
+ * Rotate (circular shift) a String of shift characters.
+ * @author Mehmet Yildirim ([email protected])
+ * @version $Id$
+ * @since 0.12
+ */
+public final class RotatedText implements Text {
+
+    /**
+     * The text.
+     */
+    private final Text origin;
+
+    /**
+     * The move.
+     */
+    private final int move;
+
+    /**
+     * Ctor.
+     * @param text The text
+     * @param shift The shift
+     */
+    public RotatedText(final Text text, final int shift) {
+        this.origin = text;
+        this.move = shift;
+    }
+
+    @Override
+    public String asString() throws IOException {
+        String text = this.origin.asString();
+        final int length = text.length();
+        if (length != 0 && this.move != 0 && this.move % length != 0) {
+            final StringBuilder builder = new StringBuilder(length);
+            int offset = -(this.move % length);
+            if (offset < 0) {
+                offset = text.length() + offset;
+            }
+            text = builder.append(
+                text.substring(offset)
+            ).append(
+                text.substring(0, offset)
+            ).toString();
+        }
+        return text;
+    }
+
+    @Override
+    public int compareTo(final Text text) {
+        return new UncheckedText(this).compareTo(text);
+    }
+
+}

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

@@ -0,0 +1,96 @@
+/**
+ * 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.text;
+
+import org.cactoos.TextHasString;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test case for {@link RotatedText}.
+ *
+ * @author Mehmet Yildirim ([email protected])
+ * @version $Id$
+ * @since 0.12
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class RotatedTextTest {
+
+    @Test
+    public void rotateRightText() {
+        MatcherAssert.assertThat(
+            "Can't rotate text to right",
+            new RotatedText(
+                new TextOf("Hello!"), 2
+            ),
+            new TextHasString("o!Hell")
+        );
+    }
+
+    @Test
+    public void rotateLeftText() {
+        MatcherAssert.assertThat(
+            "Can't rotate text to left",
+            new RotatedText(
+                new TextOf("Hi!"), -1
+            ),
+            new TextHasString("i!H")
+        );
+    }
+
+    @Test
+    public void noRotateWhenShiftZero() {
+        final String nonrotate = "Cactoos!";
+        MatcherAssert.assertThat(
+            "Rotate text shift zero",
+            new RotatedText(
+                new TextOf(nonrotate), 0
+            ),
+            new TextHasString(nonrotate)
+        );
+    }
+
+    @Test
+    public void noRotateWhenShiftModZero() {
+        final String nonrotate = "Rotate";
+        MatcherAssert.assertThat(
+            "Rotate text shift mod zero",
+            new RotatedText(
+                new TextOf(nonrotate), nonrotate.length()
+            ),
+            new TextHasString(nonrotate)
+        );
+    }
+
+    @Test
+    public void noRotateWhenEmpty() {
+        MatcherAssert.assertThat(
+            "Rotate text when empty",
+            new RotatedText(
+                new TextOf(""), 2
+            ),
+            new TextHasString("")
+        );
+    }
+}