IteratorOfLongs and IteratorOfShorts yegor256#838

src/main/java/org/cactoos/iterable/IterableOfLongs.java

@@ -23,18 +23,12 @@
  */
 package org.cactoos.iterable;
 
-import java.util.ArrayList;
-import java.util.Collection;
+import org.cactoos.iterator.IteratorOfLongs;
 
 /**
  * Iterable of long values.
  *
  * @since 1.0
- * @todo #802:30min Introduce IteratorOfLongs and IteratorOfShorts which will
- *  take array of their related primitive types (long, short) and
- *  produce iterator of reference type (Long, Short).
- *  Refactor appropriate IterableOf* classes by using those newly created
- *  iterators to avoid unnecessary copying elements to a new array.
  */
 public final class IterableOfLongs extends IterableEnvelope<Long> {
 
@@ -43,13 +37,6 @@ public final class IterableOfLongs extends IterableEnvelope<Long> {
      * @param values Long values
      */
     public IterableOfLongs(final long... values) {
-        super(() -> {
-            final Collection<Long> iterable =
-                new ArrayList<>(values.length);
-            for (final long value: values) {
-                iterable.add(value);
-            }
-            return iterable;
-        });
+        super(() -> () -> new IteratorOfLongs(values));
     }
 }

src/main/java/org/cactoos/iterable/IterableOfShorts.java

@@ -23,8 +23,7 @@
  */
 package org.cactoos.iterable;
 
-import java.util.ArrayList;
-import java.util.Collection;
+import org.cactoos.iterator.IteratorOfShorts;
 
 /**
  * Iterable of short values.
@@ -39,13 +38,6 @@ public final class IterableOfShorts extends IterableEnvelope<Short> {
      */
     @SuppressWarnings("PMD.AvoidUsingShortType")
     public IterableOfShorts(final short... values) {
-        super(() -> {
-            final Collection<Short> iterable =
-                new ArrayList<>(values.length);
-            for (final short value: values) {
-                iterable.add(value);
-            }
-            return iterable;
-        });
+        super(() -> () -> new IteratorOfShorts(values));
     }
 }

src/main/java/org/cactoos/iterator/IteratorOfLongs.java

@@ -0,0 +1,72 @@
+/*
+ * 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.iterator;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * {@link Iterator} that returns the {@code long}s as {@link Long}s.
+ *
+ * <p>There is no thread-safety guarantee.</p>
+ *
+ * @since 0.34
+ */
+public final class IteratorOfLongs implements Iterator<Long> {
+
+    /**
+     * The list of items to iterate.
+     */
+    private final long[] items;
+
+    /**
+     * Current position.
+     */
+    private final AtomicInteger position;
+
+    /**
+     * Ctor.
+     * @param itms Items to iterate
+     */
+    public IteratorOfLongs(final long... itms) {
+        this.items = itms;
+        this.position = new AtomicInteger(0);
+    }
+
+    @Override
+    public boolean hasNext() {
+        return this.position.intValue() < this.items.length;
+    }
+
+    @Override
+    public Long next() {
+        if (!this.hasNext()) {
+            throw new NoSuchElementException(
+                "The iterator doesn't have any more items"
+            );
+        }
+        return this.items[this.position.getAndIncrement()];
+    }
+}

src/main/java/org/cactoos/iterator/IteratorOfShorts.java

@@ -0,0 +1,73 @@
+/*
+ * 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.iterator;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * {@link Iterator} that returns the {@code short}s as {@link Short}s.
+ *
+ * <p>There is no thread-safety guarantee.</p>
+ *
+ * @since 0.34
+ */
+@SuppressWarnings("PMD.AvoidUsingShortType")
+public final class IteratorOfShorts implements Iterator<Short> {
+
+    /**
+     * The list of items to iterate.
+     */
+    private final short[] items;
+
+    /**
+     * Current position.
+     */
+    private final AtomicInteger position;
+
+    /**
+     * Ctor.
+     * @param itms Items to iterate
+     */
+    public IteratorOfShorts(final short... itms) {
+        this.items = itms;
+        this.position = new AtomicInteger(0);
+    }
+
+    @Override
+    public boolean hasNext() {
+        return this.position.intValue() < this.items.length;
+    }
+
+    @Override
+    public Short next() {
+        if (!this.hasNext()) {
+            throw new NoSuchElementException(
+                "The iterator doesn't have any more items"
+            );
+        }
+        return this.items[this.position.getAndIncrement()];
+    }
+}

src/test/java/org/cactoos/iterator/IteratorOfLongsTest.java

@@ -0,0 +1,70 @@
+/*
+ * 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.iterator;
+
+import java.util.NoSuchElementException;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+
+/**
+ * Tests for {@link IteratorOfLongs}.
+ *
+ * @since 0.34
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class IteratorOfLongsTest {
+    @Test
+    public void emptyIteratorDoesNotHaveNext() {
+        MatcherAssert.assertThat(
+            "hasNext is true for empty iterator.",
+            new IteratorOfLongs().hasNext(),
+            new IsEqual<>(false)
+        );
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void emptyIteratorThrowsException() {
+        new IteratorOfLongs().next();
+    }
+
+    @Test
+    public void nonEmptyIteratorDoesNotHaveNext() {
+        final IteratorOfLongs iterator = new IteratorOfLongs(1, 2);
+        iterator.next();
+        iterator.next();
+        MatcherAssert.assertThat(
+            "hasNext is true for fully traversed iterator.",
+            iterator.hasNext(),
+            new IsEqual<>(false)
+        );
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void nonEmptyIteratorThrowsException() {
+        final IteratorOfLongs iterator = new IteratorOfLongs(1);
+        iterator.next();
+        iterator.next();
+    }
+}

src/test/java/org/cactoos/iterator/IteratorOfShortsTest.java

@@ -0,0 +1,73 @@
+/*
+ * 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.iterator;
+
+import java.util.NoSuchElementException;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+
+/**
+ * Tests for {@link IteratorOfShorts}.
+ *
+ * @since 0.34
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+@SuppressWarnings("PMD.AvoidUsingShortType")
+public final class IteratorOfShortsTest {
+    @Test
+    public void emptyIteratorDoesNotHaveNext() {
+        MatcherAssert.assertThat(
+            "hasNext is true for empty iterator.",
+            new IteratorOfShorts().hasNext(),
+            new IsEqual<>(false)
+        );
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void emptyIteratorThrowsException() {
+        new IteratorOfShorts().next();
+    }
+
+    @Test
+    public void nonEmptyIteratorDoesNotHaveNext() {
+        final IteratorOfShorts iterator = new IteratorOfShorts(
+            (short) 1, (short) 2
+        );
+        iterator.next();
+        iterator.next();
+        MatcherAssert.assertThat(
+            "hasNext is true for fully traversed iterator.",
+            iterator.hasNext(),
+            new IsEqual<>(false)
+        );
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void nonEmptyIteratorThrowsException() {
+        final IteratorOfShorts iterator = new IteratorOfShorts((short) 1);
+        iterator.next();
+        iterator.next();
+    }
+}