[java-support] branch master updated: Null-safe immutable collection builders.

[Scott Cantor]

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scantor pushed a commit to branch master
in repository java-support.

View the commit online:
http://git.shibboleth.net/view/?p=java-support.git;a=commit;h=d7aaa1f5903be24efac8849e00f6e47cf719d754

The following commit(s) were added to refs/heads/master by this push:
       new  d7aaa1f   Null-safe immutable collection builders.
d7aaa1f is described below

commit d7aaa1f5903be24efac8849e00f6e47cf719d754
Author: Scott Cantor <cantor.2 at osu.edu>
AuthorDate: Tue Mar 26 20:54:17 2019 -0400

    Null-safe immutable collection builders.
---
 .../java/support/collection/CollectionSupport.java | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java b/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java
index bc93eb7..1f75023 100644
--- a/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java
+++ b/src/main/java/net/shibboleth/utilities/java/support/collection/CollectionSupport.java
@@ -18,12 +18,20 @@
 package net.shibboleth.utilities.java.support.collection;
 
 import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
 import java.util.function.Function;
 import java.util.function.Predicate;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+
+import net.shibboleth.utilities.java.support.annotation.constraint.NotLive;
+import net.shibboleth.utilities.java.support.annotation.constraint.Unmodifiable;
 import net.shibboleth.utilities.java.support.logic.Constraint;
 
 /** Helper methods for working with collections of objects. */
@@ -33,6 +41,45 @@ public final class CollectionSupport {
     private CollectionSupport() {
 
     }
+    
+    /**
+     * Builds an immutable list containing the source collection, allowing for a null collection.
+     * 
+     * @param <T> source type
+     * @param source objects to populate into list, or null
+     * 
+     * @return An immutable list containing the source objects
+     * 
+     * @since 8.0.0
+     */
+    @Nonnull @NotLive @Unmodifiable public static <T> List<T> buildImmutableList(
+            @Nullable final Collection<? extends T> source) {
+        if (source != null) {
+            return ImmutableList.copyOf(source);
+        } else {
+            return Collections.emptyList();
+        }
+    }
+
+    /**
+     * Builds an immutable set containing the source collection, allowing for a null collection.
+     * 
+     * @param <T> source type
+     * @param source objects to populate into set, or null
+     * 
+     * @return An immutable set containing the source objects
+     * 
+     * @since 8.0.0
+     */
+    @Nonnull @NotLive @Unmodifiable public static <T> Set<T> buildImmutableSet(
+            @Nullable final Collection<? extends T> source) {
+        if (source != null) {
+            return ImmutableSet.copyOf(source);
+        } else {
+            return Collections.emptySet();
+        }
+    }    
+    
 
     /**
      * Adds an element to a collection if it meets the requirements of a given predicate.

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