#114 StickyIterable

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

@@ -23,7 +23,10 @@
  */
 package org.cactoos.list;
 
+import java.util.Collection;
 import java.util.Iterator;
+import java.util.LinkedList;
+import org.cactoos.func.StickyScalar;
 import org.cactoos.func.UncheckedScalar;
 
 /**
@@ -39,21 +42,31 @@
 public final class StickyIterable<X> implements Iterable<X> {
 
     /**
-     * The cache.
+     * The gate.
      */
-    private final UncheckedScalar<Iterator<X>> cache;
+    private final UncheckedScalar<Iterable<X>> gate;
 
     /**
      * Ctor.
      * @param iterable The iterable
      */
     public StickyIterable(final Iterable<X> iterable) {
-        this.cache = new UncheckedScalar<>(iterable::iterator);
+        this.gate = new UncheckedScalar<>(
+            new StickyScalar<>(
+                () -> {
+                    final Collection<X> temp = new LinkedList<>();
+                    for (final X item : iterable) {
+                        temp.add(item);
+                    }
+                    return temp;
+                }
+            )
+        );
     }
 
     @Override
     public Iterator<X> iterator() {
-        return this.cache.asValue();
+        return this.gate.asValue().iterator();
     }
 
 }

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

@@ -0,0 +1,57 @@
+/**
+ * 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.concurrent.atomic.AtomicInteger;
+import org.cactoos.ScalarHasValue;
+import org.hamcrest.MatcherAssert;
+import org.junit.Test;
+
+/**
+ * Test case for {@link StickyIterable}.
+ *
+ * @author Yegor Bugayenko (yegor256@gmail.com)
+ * @version $Id$
+ * @since 0.8
+ * @checkstyle JavadocMethodCheck (500 lines)
+ */
+public final class StickyIterableTest {
+
+    @Test
+    public void ignoresChangesInIterable() throws Exception {
+        final AtomicInteger size = new AtomicInteger(2);
+        final Iterable<Integer> list = new StickyIterable<>(
+            new IterableAsList<>(
+                () -> Collections.nCopies(size.incrementAndGet(), 0).iterator()
+            )
+        );
+        MatcherAssert.assertThat(
+            "Can't ignore the changes in the underlying iterable",
+            new LengthOfIterable(list),
+            new ScalarHasValue<>(new LengthOfIterable(list).asValue())
+        );
+    }
+
+}