Generate legacy List adaptation

[mdsal.git] / binding / yang-binding / src / main / java / org / opendaylight / yangtools / yang / binding / CodeHelpers.java

diff --git a/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java
index 5a49f51e05663f4453977d847f8de248d432396c..2dd7ac1674c302dbd93cf2997dca7a6e257437a2 100644 (file)
--- a/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java
+++ b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java
@@ -15,6 +15,7 @@ import com.google.common.base.MoreObjects.ToStringHelper;
 import com.google.common.base.VerifyException;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
@@ -272,6 +273,24 @@ public final class CodeHelpers {
         return input != null && input.isEmpty() ? null : input;
     }
 
+    /**
+     * Compatibility utility for turning a List of identifiable objects to an indexed map.
+     *
+     * @param <K> key type
+     * @param <V> identifiable type
+     * @param list legacy list
+     * @return Indexed map
+     * @throws IllegalArgumentException if the list contains entries with the same key
+     * @throws NullPointerException if the list contains a null entry
+     * @deprecated This method is a transitional helper used only in methods deprecated themselves.
+     */
+    // FIXME: MDSAL-540: remove this method
+    @Deprecated
+    public static <K extends Identifier<V>, V extends Identifiable<K>> @Nullable Map<K, V> compatMap(
+            final @Nullable List<V> list) {
+        return list == null || list.isEmpty() ? null : Maps.uniqueIndex(list, Identifiable::key);
+    }
+
     /**
      * Return hash code of a single-property wrapper class. Since the wrapper is not null, we really want to discern
      * this object being present, hence {@link Objects#hashCode()} is not really useful we would end up with {@code 0}