X-Git-Url: https://gerrit.onap.org/r/gitweb?a=blobdiff_plain;f=models-base%2Fsrc%2Fmain%2Fjava%2Forg%2Fonap%2Fpolicy%2Fmodels%2Fbase%2FPfUtils.java;h=57d23450a2c98fc51cc1eca88b96fe6fb313c07f;hb=4c4946e339942863e73e20726dd95aaacfcfb5a6;hp=d5b70d78ad75a057f407dcd63a01c2e4d07f6d9d;hpb=ab145590ffdf99b9f4e132e5f20241099d6c5cbe;p=policy%2Fmodels.git

diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java b/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
index d5b70d78a..57d23450a 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
@@ -22,6 +22,7 @@
 package org.onap.policy.models.base;
 
 import java.lang.reflect.InvocationTargetException;
+import java.util.Collection;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -29,6 +30,8 @@ import java.util.Map.Entry;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 import javax.ws.rs.core.Response;
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.collections4.MapUtils;
 
 /**
  * Utility class for Policy Framework concept utilities.
@@ -67,6 +70,37 @@ public final class PfUtils {
         return 0;
     }
 
+    /**
+     * Compare two collections of the same type, nulls are allowed.
+     *
+     * @param leftCollection the first collection
+     * @param rightCollection the second collection
+     * @return a measure of the comparison
+     */
+    public static <T> int compareCollections(final Collection<T> leftCollection, final Collection<T> rightCollection) {
+        if (CollectionUtils.isEmpty(leftCollection) && CollectionUtils.isEmpty(rightCollection)) {
+            return 0;
+        }
+
+        return compareObjects(leftCollection, rightCollection);
+    }
+
+
+    /**
+     * Compare two maps of the same type, nulls are allowed.
+     *
+     * @param leftMap the first map
+     * @param rightMap the second map
+     * @return a measure of the comparison
+     */
+    public static <K, V> int compareMaps(final Map<K, V> leftMap, final Map<K, V> rightMap) {
+        if (MapUtils.isEmpty(leftMap) && MapUtils.isEmpty(rightMap)) {
+            return 0;
+        }
+
+        return compareObjects(leftMap, rightMap);
+    }
+
     /**
      * Convenience method to apply a mapping function to all of the elements of a list, generating a new list.
      *