Merge branch '__rultor'

src/main/java/org/cactoos/list/CycledIterable.java

@@ -0,0 +1,58 @@
+/**
+ * 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.list;
+
+import java.util.Iterator;
+
+/**
+ * Cycled Iterable.
+ *
+ * <p>There is no thread-safety guarantee.
+ *
+ * @author Ilia Rogozhin (ilia.rogozhin@gmail.com)
+ * @version $Id$
+ * @param <T> Type of item
+ * @since 0.8
+ */
+public final class CycledIterable<T> implements Iterable<T> {
+
+    /**
+     * Iterable.
+     */
+    private final Iterable<T> iterable;
+
+    /**
+     * Ctor.
+     * @param iterable Iterable
+     */
+    public CycledIterable(final Iterable<T> iterable) {
+        this.iterable = iterable;
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+        return new CycledIterator<>(this.iterable);
+    }
+}

src/main/java/org/cactoos/list/CycledIterator.java

@@ -0,0 +1,75 @@
+/**
+ * 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.list;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Cycled Iterator.
+ *
+ * <p>There is no thread-safety guarantee.
+ *
+ * @author Ilia Rogozhin (ilia.rogozhin@gmail.com)
+ * @version $Id$
+ * @param <T> Type of item
+ * @since 0.8
+ */
+public final class CycledIterator<T> implements Iterator<T> {
+
+    /**
+     * Iterable.
+     */
+    private final Iterable<T> iterable;
+
+    /**
+     * Iterator.
+     */
+    private Iterator<T> iterator;
+
+    /**
+     * Ctor.
+     * @param iterable Iterable.
+     */
+    public CycledIterator(final Iterable<T> iterable) {
+        this.iterable = iterable;
+    }
+
+    @Override
+    public boolean hasNext() {
+        if (this.iterator == null || !this.iterator.hasNext()) {
+            this.iterator = this.iterable.iterator();
+        }
+        return this.iterator.hasNext();
+    }
+
+    @Override
+    public T next() {
+        if (!this.hasNext()) {
+            throw new NoSuchElementException();
+        }
+        return this.iterator.next();
+    }
+}

src/test/java/org/cactoos/list/CycledIterableTest.java

@@ -0,0 +1,72 @@
+/**
+ * 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.list;
+
+import java.util.Collections;
+import org.cactoos.ScalarHasValue;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test Case for {@link CycledIterable}.
+ * @author Ilia Rogozhin (ilia.rogozhin@gmail.com)
+ * @version $Id$
+ * @since 0.8
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class CycledIterableTest {
+
+    @Test
+    public void repeatIterableTest() throws Exception {
+        final String expected = "two";
+        MatcherAssert.assertThat(
+            "Can't repeat iterable",
+            new ItemOfIterable<>(
+                new CycledIterable<>(
+                    new ArrayAsIterable<>(
+                        "one", expected, "three"
+                    )
+                ),
+                // @checkstyle MagicNumberCheck (1 line)<
+                7
+            ),
+            new ScalarHasValue<>(
+                expected
+            )
+        );
+    }
+
+    @Test()
+    public void notCycledEmptyTest() throws Exception {
+        MatcherAssert.assertThat(
+            "Can't generate an empty iterable",
+            new LengthOfIterable(
+                new CycledIterable<>(
+                    Collections::emptyIterator
+                )
+            ),
+            new ScalarHasValue<>(0)
+        );
+    }
+}

src/test/java/org/cactoos/list/CycledIteratorTest.java

@@ -0,0 +1,67 @@
+/**
+ * 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.list;
+
+import java.util.Collections;
+import java.util.NoSuchElementException;
+import org.cactoos.ScalarHasValue;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test Case for {@link CycledIterator}.
+ * @author Ilia Rogozhin (ilia.rogozhin@gmail.com)
+ * @version $Id$
+ * @since 0.8
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class CycledIteratorTest {
+
+    @Test
+    public void repeatIteratorTest() throws Exception {
+        final String expected = "two";
+        MatcherAssert.assertThat(
+            "Can't repeat iterator",
+            new ItemOfIterator<>(
+                new CycledIterator<>(
+                    new ArrayAsIterable<>(
+                        "one", expected, "three"
+                    )
+                ),
+                // @checkstyle MagicNumberCheck (1 line)
+                7
+            ),
+            new ScalarHasValue<>(
+                expected
+            )
+        );
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void notCycledEmptyTest() throws Exception {
+        new CycledIterator<>(
+            Collections::emptyIterator
+        ).next();
+    }
+}