finished first cookbook - examples

Eugen Paraschiv · Eugen Paraschiv · commit be8ac5daa51b · 2013-10-23T12:13:43.000+03:00
diff --git a/guava/src/test/java/org/baeldung/guava/collections/GuavaCollectionsExamplesTest.java b/guava/src/test/java/org/baeldung/guava/collections/GuavaCollectionsExamplesTest.java
@@ -5,17 +5,24 @@
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.Set;
 
 import org.junit.Test;
 
 import com.google.common.base.Function;
 import com.google.common.base.Predicate;
+import com.google.common.base.Predicates;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 
+@SuppressWarnings("unused")
 public class GuavaCollectionsExamplesTest {
 
     // tests
@@ -96,7 +103,7 @@ public final boolean apply(final String input) {
     //
 
     @Test(expected = NoSuchElementException.class)
-    public final void givenNoSearchResult_whenFindingElementInIterable_thenNoException() {
+    public final void givenNoSearchResult_whenFindingElementInIterable_thenException() {
         final Iterable<String> theCollection = Sets.newHashSet("abcd", "efgh", "ijkl");
 
         final String found = Iterables.find(theCollection, new Predicate<String>() {
@@ -109,4 +116,61 @@ public final boolean apply(final String input) {
         assertNull(found);
     }
 
+    @Test
+    public final void givenNoSearchResult_whenFindingElementInIterableWithSpecifiedReturn_thenNoException() {
+        final Iterable<String> theCollection = Sets.newHashSet("abcd", "efgh", "ijkl");
+
+        final Predicate<String> inputOfLengthOne = new Predicate<String>() {
+            @Override
+            public final boolean apply(final String input) {
+                return input.length() == 1;
+            }
+        };
+        final String found = Iterables.find(theCollection, inputOfLengthOne, null);
+
+        assertNull(found);
+    }
+
+    // purge of nulls
+
+    @Test
+    public final void givenListContainsNulls_whenPurgedOfNulls_thenNoLongerContainsNulls() {
+        final List<String> values = Lists.newArrayList("a", null, "b", "c");
+        final Iterable<String> withoutNulls = Iterables.filter(values, Predicates.notNull());
+        System.out.println(withoutNulls);
+    }
+
+    // immutable collections
+
+    @Test
+    public final void whenCreatingImuutableCollections_thenNoExceptions() {
+        final ImmutableList<String> immutableList = ImmutableList.of("a", "b", "c");
+        final ImmutableSet<String> immutableSet = ImmutableSet.of("a", "b", "c");
+        final ImmutableMap<String, String> imuttableMap = ImmutableMap.of("k1", "v1", "k2", "v2", "k3", "v3");
+    }
+
+    @Test
+    public final void whenTransformingCollectionsToImmutable_thenNoExceptions() {
+        final List<String> muttableList = Lists.newArrayList();
+        final ImmutableList<String> immutableList = ImmutableList.copyOf(muttableList);
+
+        final Set<String> muttableSet = Sets.newHashSet();
+        final ImmutableSet<String> immutableSet = ImmutableSet.copyOf(muttableSet);
+
+        final Map<String, String> muttableMap = Maps.newHashMap();
+        final ImmutableMap<String, String> imuttableMap = ImmutableMap.copyOf(muttableMap);
+    }
+
+    @Test
+    public final void whenTransformingCollectionsToImmutableViaBuilders_thenNoExceptions() {
+        final List<String> muttableList = Lists.newArrayList();
+        final ImmutableList<String> immutableList = ImmutableList.<String> builder().addAll(muttableList).build();
+
+        final Set<String> muttableSet = Sets.newHashSet();
+        final ImmutableSet<String> immutableSet = ImmutableSet.<String> builder().addAll(muttableSet).build();
+
+        final Map<String, String> muttableMap = Maps.newHashMap();
+        final ImmutableMap<String, String> imuttableMap = ImmutableMap.<String, String> builder().putAll(muttableMap).build();
+    }
+
 }
