diff --git a/src/main/java/org/cactoos/text/IsBlank.java b/src/main/java/org/cactoos/text/IsBlank.java new file mode 100644 index 0000000000..b8a5cc4b87 --- /dev/null +++ b/src/main/java/org/cactoos/text/IsBlank.java @@ -0,0 +1,61 @@ +/** + * 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.Scalar; +import org.cactoos.Text; + +/** + * Determines if text is blank (consists of spaces) or no. + * + *

There is no thread-safety guarantee. + * + * @author Andriy Kryvtsun (kontiky@gmail.com) + * @version $Id$ + * @since 0.1 + */ +public final class IsBlank implements Scalar { + + /** + * The text. + */ + private final Text origin; + + /** + * Ctor. + * @param text The text + */ + public IsBlank(final Text text) { + this.origin = text; + } + + @Override + public Boolean asValue() throws IOException { + return !this.origin.asString().chars() + .filter(c -> !Character.isWhitespace(c)) + .findFirst() + .isPresent(); + } +} diff --git a/src/test/java/org/cactoos/text/IsBlankTest.java b/src/test/java/org/cactoos/text/IsBlankTest.java new file mode 100644 index 0000000000..2d7cff73af --- /dev/null +++ b/src/test/java/org/cactoos/text/IsBlankTest.java @@ -0,0 +1,80 @@ +/** + * 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.hamcrest.MatcherAssert; +import org.hamcrest.Matchers; +import org.junit.Test; + +/** + * Test case for {@link IsBlank}. + * @author Andriy Kryvtsun (kontiky@gmail.com) + * @version $Id$ + * @since 0.1 + */ +public final class IsBlankTest { + + /** + * IsBlank can detect empty string. + * @throws IOException If some problem inside + */ + @Test + public void determinesEmptyText() throws IOException { + MatcherAssert.assertThat( + new IsBlank( + new StringAsText("") + ).asValue(), + Matchers.is(Boolean.TRUE) + ); + } + + /** + * IsBlank can detect blank string. + * @throws IOException If some problem inside + */ + @Test + public void determinesBlankText() throws IOException { + MatcherAssert.assertThat( + new IsBlank( + new StringAsText(" ") + ).asValue(), + Matchers.is(Boolean.TRUE) + ); + } + + /** + * IsBlank can detect non blank string. + * @throws IOException If some problem inside + */ + @Test + public void determinesNotBlankText() throws IOException { + MatcherAssert.assertThat( + new IsBlank( + new StringAsText("not empty") + ).asValue(), + Matchers.is(Boolean.FALSE) + ); + } +}