Initial commit.

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

@@ -0,0 +1,79 @@
+/**
+ * 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;
+
+/**
+ * Text padded at start to reach the given length.
+ *
+ * @author Vivek Poddar ([email protected])
+ * @version $Id$
+ * @since 0.1
+ */
+public final class PaddedTextStart implements Text {
+
+    /**
+     * The text.
+     */
+    private final Text origin;
+
+    /**
+     * The minimum length of the resulting string.
+     */
+    private final int minLength;
+
+    /**
+     * The character to be padded at the begining.
+     */
+    private final char padChar;
+
+    /**
+     * Ctor.
+     * @param text The text
+     * @param minLength The minimum length of the resulting string
+     */
+    public PaddedTextStart(final NotNullText text, final int minLength, final char padChar) {
+        this.origin = text;
+        this.padChar = padChar;
+        this.minLength = minLength;
+    }
+
+    @Override
+    public String asString() throws IOException {
+        final String originString = this.origin.asString();
+        if (originString.length() >= this.minLength) {
+          return originString;
+        }
+
+        final StringBuilder sb = new StringBuilder(this.minLength);
+        for (int i = originString.length(); i < this.minLength; i++) {
+          sb.append(this.padChar);
+        }
+        sb.append(originString);
+        return sb.toString();
+    }
+}
+

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

@@ -0,0 +1,83 @@
+/**
+ * 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.cactoos.TextHasString;
+import org.cactoos.text.NotNullText;
+import org.junit.Test;
+
+/**
+ * Test case for {@link PaddedTextStart}.
+ *
+ * @author Vivek Poddar ([email protected])
+ * @version $Id$
+ * @since 0.1
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class PaddedTextStartTest {
+
+    @Test
+    public void noPadding() {
+        MatcherAssert.assertThat(
+            "Shouldn't pad the text",
+            new PaddedTextStart(
+              new NotNullText(
+                new StringAsText("x")
+              ), 1, '-'),
+            new TextHasString("x")
+        );
+    }
+
+    @Test
+    public void somePadding() {
+        MatcherAssert.assertThat(
+            "Should pad chars at start",
+            new PaddedTextStart(
+              new NotNullText(
+                new StringAsText("x")
+              ), 2, '-'),
+            new TextHasString("-x")
+        );
+    }
+
+    @Test
+    public void negativeMinLength()  {
+        MatcherAssert.assertThat(
+            "Shouldn't consider negative min length",
+            new PaddedTextStart(
+              new NotNullText(
+                new StringAsText("x")
+              ), -1, '-'),
+            new TextHasString("x")
+        );
+    }
+
+    @Test(expected = IOException.class)
+    public void failForNullText() throws IOException {
+        new PaddedTextStart(new NotNullText(null), 1, '-').asString();
+    }
+}
+