(yegor256#919) Joined input

src/main/java/org/cactoos/io/Joined.java

@@ -0,0 +1,65 @@
+/*
+ * 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.io;
+
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+import org.cactoos.Input;
+import org.cactoos.iterable.IterableOf;
+import org.cactoos.iterable.Mapped;
+import org.cactoos.scalar.Reduced;
+
+/**
+ * Concatenation of several inputs.
+ * @since 0.36
+ */
+public final class Joined implements Input {
+    /**
+     * The inputs.
+     */
+    private final Iterable<Input> inputs;
+
+    /**
+     * Ctor.
+     * @param first First input
+     * @param rest The rest
+     */
+    public Joined(final Input first, final Input... rest) {
+        this.inputs = new org.cactoos.iterable.Joined<>(
+            first,
+            new IterableOf<>(rest)
+        );
+    }
+
+    @Override
+    public InputStream stream() throws Exception {
+        return new Reduced<InputStream>(
+            (left, right) -> new SequenceInputStream(left, right),
+            new Mapped<>(
+                input -> () -> input.stream(),
+                this.inputs
+            )
+        ).value();
+    }
+}

src/test/java/org/cactoos/io/JoinedTest.java

@@ -0,0 +1,55 @@
+/*
+ * 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.io;
+
+import java.io.IOException;
+import org.cactoos.text.TextOf;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+import org.llorllale.cactoos.matchers.TextHasString;
+
+/**
+ * Unit tests for {@link Joined}.
+ * @since 0.36
+ */
+public final class JoinedTest {
+    /**
+     * Must join inputs in the given order.
+     * @throws IOException If an error occurs
+     */
+    @Test
+    public void joinsOk() throws IOException {
+        MatcherAssert.assertThat(
+            "Cannot properly join inputs",
+            new TextOf(
+                new Joined(
+                    new InputOf("first"),
+                    new InputOf("second"),
+                    new InputOf("third")
+                )
+            ),
+            new TextHasString("firstsecondthird")
+        );
+    }
+}