Add Features to SDK (#112)

Author: wangjoshuah

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

@@ -0,0 +1,80 @@
+/**
+ *
+ *    Copyright 2017, Optimizely and contributors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package com.optimizely.ab.config;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.List;
+
+/**
+ * Represents a Feature definition at the project level
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Feature implements IdKeyMapped{
+
+    private final String id;
+    private final String key;
+    private final String layerId;
+    private final List<String> experimentIds;
+    private final List<LiveVariable> variables;
+
+    @JsonCreator
+    public Feature(@JsonProperty("id") String id,
+                   @JsonProperty("key") String key,
+                   @JsonProperty("layerId") String layerId,
+                   @JsonProperty("experimentIds") List<String> experimentIds,
+                   @JsonProperty("variables") List<LiveVariable> variables) {
+        this.id = id;
+        this.key = key;
+        this.layerId = layerId;
+        this.experimentIds = experimentIds;
+        this.variables = variables;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public String getLayerId() {
+        return layerId;
+    }
+
+    public List<String> getExperimentIds() {
+        return experimentIds;
+    }
+
+    public List<LiveVariable> getVariables() {
+        return variables;
+    }
+
+    @Override
+    public String toString() {
+        return "Feature{" +
+                "id='" + id + '\'' +
+                ", key='" + key + '\'' +
+                ", layerId='" + layerId + '\'' +
+                ", experimentIds=" + experimentIds +
+                ", variables=" + variables +
+                '}';
+    }
+}