Add holdout public method to datafile project config

Author: muzahidul-opti

core-api/src/main/java/com/optimizely/ab/config/DatafileProjectConfig.java

@@ -445,7 +445,19 @@ public List<Experiment> getExperiments() {
     }
 
     @Override
-    public List<Holdout> getHoldouts() { return holdoutConfig.getAllHoldouts(); }
+    public List<Holdout> getHoldouts() { 
+        return holdoutConfig.getAllHoldouts(); 
+    }
+
+    @Override
+    public List<Holdout> getHoldoutForFlag(@Nonnull String id) {
+        return holdoutConfig.getHoldoutForFlag(id);
+    }
+
+    @Override   
+    public Holdout getHoldout(@Nonnull String id) {
+        return holdoutConfig.getHoldout(id);
+    }
 
     @Override
     public Set<String> getAllSegments() {

core-api/src/main/java/com/optimizely/ab/config/HoldoutConfig.java

@@ -159,4 +159,4 @@ public Holdout getHoldout(@Nonnull String id) {
     public List<Holdout> getAllHoldouts() {
         return Collections.unmodifiableList(allHoldouts);
     }
-}
+}

core-api/src/main/java/com/optimizely/ab/config/ProjectConfig.java

@@ -16,15 +16,16 @@
  */
 package com.optimizely.ab.config;
 
-import com.optimizely.ab.config.audience.Audience;
-import com.optimizely.ab.error.ErrorHandler;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 import javax.annotation.CheckForNull;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+
+import com.optimizely.ab.config.audience.Audience;
+import com.optimizely.ab.error.ErrorHandler;
 
 /**
  * ProjectConfig is an interface capturing the experiment, variation and feature definitions.
@@ -72,6 +73,10 @@ Experiment getExperimentForKey(@Nonnull String experimentKey,
 
     List<Holdout > getHoldouts();
 
+    List<Holdout> getHoldoutForFlag(@Nonnull String id);
+
+    Holdout getHoldout(@Nonnull String id);
+
     Set<String> getAllSegments();
 
     List<Experiment> getExperimentsForEventKey(String eventKey);