add layers and rollouts (#115)

* create layer model in SDK
* create rollout model

Author: wangjoshuah

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

@@ -0,0 +1,71 @@
+/**
+ *
+ *    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;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * Represents a Optimizely Layer configuration
+ *
+ * @see <a href="http://developers.optimizely.com/server/reference/index.html#json">Project JSON</a>
+ */
+@Immutable
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Layer implements IdMapped {
+
+    protected final String id;
+    protected final String policy;
+    protected final List<Experiment> experiments;
+
+    public static final String SINGLE_EXPERIMENT_POLICY = "single_experiment";
+
+    @JsonCreator
+    public Layer(@JsonProperty("id") String id,
+                 @JsonProperty("policy") String policy,
+                 @JsonProperty("experiments") List<Experiment> experiments) {
+        this.id = id;
+        this.policy = policy;
+        this.experiments = experiments;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getPolicy() {
+        return policy;
+    }
+
+    public List<Experiment> getExperiments() {
+        return experiments;
+    }
+
+    @Override
+    public String toString() {
+        return "Layer{" +
+                "id='" + id + '\'' +
+                ", policy='" + policy + '\'' +
+                ", experiments=" + experiments +
+                '}';
+    }
+}

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

@@ -0,0 +1,44 @@
+/**
+ *
+ *    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 javax.annotation.concurrent.Immutable;
+import java.util.List;
+
+/**
+ * Represents a Optimizely Rollout configuration
+ *
+ * @see <a href="http://developers.optimizely.com/server/reference/index.html#json">Project JSON</a>
+ */
+@Immutable
+public class Rollout extends Layer implements IdMapped {
+
+    public Rollout(String id,
+                   String policy,
+                   List<Experiment> experiments) {
+        super(id, policy, experiments);
+    }
+
+    @Override
+    public String toString() {
+        return "Rollout{" +
+                "id='" + id + '\'' +
+                ", policy='" + policy + '\'' +
+                ", experiments=" + experiments +
+                '}';
+    }
+}