#150 Matrix row

src/main/java/com/vssekorin/cactoosmath/matrix/Row.java

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+/**
+ * MIT License
+ *
+ * Copyright (c) 2017-2018 Vseslav Sekorin
+ *
+ * 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 NONINFRINGEMENT. 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 com.vssekorin.cactoosmath.matrix;
+
+import com.vssekorin.cactoosmath.Matrix;
+import org.cactoos.Scalar;
+import org.cactoos.iterable.IterableEnvelope;
+import org.cactoos.iterable.IterableOf;
+import org.cactoos.scalar.NumberEnvelope;
+
+/**
+ * Row of matrix.
+ *
+ * @author Vseslav Sekorin (vssekorin@gmail.com)
+ * @version $Id$
+ * @param <T> Elements type
+ * @since 0.2
+ */
+public final class Row<T> extends IterableEnvelope<T> {
+
+    /**
+     * Ctor.
+     * @param matrix Matrix
+     * @param row Number envelope
+     */
+    public Row(final Matrix<T> matrix, final NumberEnvelope row) {
+        super(() -> new IterableOf<>(matrix.asArray()[row.intValue()]));
+    }
+
+    /**
+     * Ctor.
+     * @param matrix Matrix
+     * @param row Scalar
+     */
+    public Row(final Matrix<T> matrix, final Scalar<Integer> row) {
+        super(() -> new IterableOf<>(matrix.asArray()[row.value()]));
+    }
+
+    /**
+     * Ctor.
+     * @param matrix Matrix
+     * @param row Integer
+     */
+    public Row(final Matrix<T> matrix, final int row) {
+        super(() -> new IterableOf<>(matrix.asArray()[row]));
+    }
+}

src/test/java/com/vssekorin/cactoosmath/matrix/RowTest.java

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+/**
+ * MIT License
+ *
+ * Copyright (c) 2017-2018 Vseslav Sekorin
+ *
+ * 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 NONINFRINGEMENT. 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 com.vssekorin.cactoosmath.matrix;
+
+import org.hamcrest.CoreMatchers;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test case for {@link Row}.
+ *
+ * @author Vseslav Sekorin (vssekorin@gmail.com)
+ * @version $Id$
+ * @since 0.2
+ * @checkstyle JavadocMethodCheck (500 lines)
+ * @checkstyle MagicNumberCheck (500 lines)
+ */
+public final class RowTest {
+
+    @Test
+    public void get() {
+        MatcherAssert.assertThat(
+            new Row<>(
+                new MatrixOf<Integer>(
+                    3, 3,
+                    1, 2, 3, 4, 5, 6, 7, 8, 9
+                ),
+                1
+            ),
+            CoreMatchers.hasItems(4, 5, 6)
+        );
+    }
+}