Merge branch '__rultor'

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

@@ -0,0 +1,80 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2018 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;
+
+/**
+ * Text padded at start to reach the given length.
+ *
+ * <p>There is thread safe.
+ *
+ * @author Vivek Poddar (vivekimsit@gmail.com)
+ * @version $Id$
+ * @since 0.32
+ */
+public final class PaddedStartText implements Text {
+
+    /**
+     * The text.
+     */
+    private final Text origin;
+
+    /**
+     * The minimum length of the resulting string.
+     */
+    private final int length;
+
+    /**
+     * The character to be padded at the begining.
+     */
+    private final char symbol;
+
+    /**
+     * Ctor.
+     * @param text The text
+     * @param length The minimum length of the resulting string
+     * @param symbol The padding symbol
+     */
+    public PaddedStartText(
+        final Text text, final int length, final char symbol) {
+        this.origin = text;
+        this.symbol = symbol;
+        this.length = length;
+    }
+
+    @Override
+    public String asString() throws IOException {
+        final String original = this.origin.asString();
+        final int diff = this.length - original.length();
+        final StringBuilder builder = new StringBuilder();
+        for (int len = diff; len > 0; --len) {
+            builder.append(this.symbol);
+        }
+        builder.append(original);
+        return builder.toString();
+    }
+}
+

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

@@ -0,0 +1,79 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2018 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.matchers.TextHasString;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test case for {@link PaddedStartText}.
+ *
+ * @author Vivek Poddar (vivekimsit@gmail.com)
+ * @version $Id$
+ * @since 0.1
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class PaddedStartTextTest {
+
+    @Test
+    public void noPaddingIfOrigTextIsAsLongAsRequestedLength() {
+        MatcherAssert.assertThat(
+            "Shouldn't pad the text",
+            new PaddedStartText(
+                new TextOf("x"),
+                1,
+                '-'
+            ),
+            new TextHasString("x")
+        );
+    }
+
+    @Test
+    public void somePaddingIfOrigTextIsShorterThanRequestedLength() {
+        MatcherAssert.assertThat(
+            "Should pad chars at start",
+            new PaddedStartText(
+                new TextOf("x"),
+                2,
+                '-'
+            ),
+            new TextHasString("-x")
+        );
+    }
+
+    @Test
+    public void noPaddingIfRequestedLengthIsNegative()  {
+        MatcherAssert.assertThat(
+            "Shouldn't consider negative min length",
+            new PaddedStartText(
+                new TextOf("x"),
+                -1,
+                '-'
+            ),
+            new TextHasString("x")
+        );
+    }
+}
+