diff --git a/README.md b/README.md index d93b34599d..456f7f8534 100644 --- a/README.md +++ b/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()` diff --git a/src/main/java/org/cactoos/text/RotatedText.java b/src/main/java/org/cactoos/text/RotatedText.java new file mode 100644 index 0000000000..f939ff618d --- /dev/null +++ b/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 (memoyil@gmail.com) + * @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); + } + +} diff --git a/src/test/java/org/cactoos/text/RotatedTextTest.java b/src/test/java/org/cactoos/text/RotatedTextTest.java new file mode 100644 index 0000000000..81c2ab84d4 --- /dev/null +++ b/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 (memoyil@gmail.com) + * @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("") + ); + } +}