Initial sketch and implementaion of Objectives.

These objective will be used to provide a layer of abstraction
that isolates applications for device pipeline details.

initial objective support

Change-Id: I019302822421f0fe1f508f2f7527d91578e30116

initial implemetation of a simple pipeline behaviour

Change-Id: Id0d9167896c717d05cda90e1524fc24c76e9fc9b

initial implementation of objectives

Change-Id: I768fa2020308d5feb95eaaff355aa511b323beca
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java
new file mode 100644
index 0000000..4ab79ff
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java
@@ -0,0 +1,173 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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 org.onosproject.net.flowobjective;
+
+import com.google.common.collect.ImmutableList;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.flow.TrafficTreatment;
+
+import java.util.Collection;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Default implementation of a next objective.
+ */
+public final class DefaultNextObjective implements NextObjective {
+
+    private final List<TrafficTreatment> treatments;
+    private final ApplicationId appId;
+    private final Type type;
+    private final Integer id;
+
+    private DefaultNextObjective(Integer id, List<TrafficTreatment> treatments,
+                                ApplicationId appId, Type type) {
+        this.treatments = treatments;
+        this.appId = appId;
+        this.type = type;
+        this.id = id;
+    }
+
+    @Override
+    public Collection<TrafficTreatment> next() {
+        return treatments;
+    }
+
+    @Override
+    public Type type() {
+        return type;
+    }
+
+    @Override
+    public int id() {
+        return id;
+    }
+
+    @Override
+    public int priority() {
+        return 0;
+    }
+
+    @Override
+    public ApplicationId appId() {
+        return appId;
+    }
+
+    @Override
+    public int timeout() {
+        return 0;
+    }
+
+    @Override
+    public boolean permanent() {
+        return false;
+    }
+
+    @Override
+    public Operation op() {
+        throw new UnsupportedOperationException("Next Objective has no operation");
+    }
+
+    /**
+     * Returns a new builder.
+     *
+     * @return new builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder implements NextObjective.Builder {
+
+        private ApplicationId appId;
+        private Type type;
+        private Integer id;
+
+        private final ImmutableList.Builder<TrafficTreatment> listBuilder
+                = ImmutableList.builder();
+
+
+
+        @Override
+        public NextObjective.Builder withId(int nextId) {
+            this.id = nextId;
+            return this;
+        }
+
+        @Override
+        public Builder withType(Type type) {
+            this.type = type;
+            return this;
+        }
+
+        @Override
+        public Builder addTreatment(TrafficTreatment treatment) {
+            listBuilder.add(treatment);
+            return this;
+        }
+
+        /**
+         * Noop. This method has no effect.
+         *
+         * @param timeout a timeout
+         * @return a next objective builder
+         */
+        @Override
+        public Builder makeTemporary(int timeout) {
+            return this;
+        }
+
+        /**
+         * Noop. This method has no effect.
+         *
+         * @return a next objective builder
+         */
+        @Override
+        public Builder makePermanent() {
+            return this;
+        }
+
+        @Override
+        public Builder fromApp(ApplicationId appId) {
+            this.appId = appId;
+            return this;
+        }
+
+        /**
+         * Noop. This method has no effect.
+         *
+         * @param priority an integer
+         * @return a next objective builder
+         */
+        @Override
+        public Builder withPriority(int priority) {
+            return this;
+        }
+
+        @Override
+        public NextObjective build() {
+            List<TrafficTreatment> treatments = listBuilder.build();
+            checkNotNull(appId, "Must supply an application id");
+            checkNotNull(id, "id cannot be null");
+            checkNotNull(type, "The type cannot be null");
+            checkArgument(!treatments.isEmpty(), "Must have at least one treatment");
+
+            return new DefaultNextObjective(id, treatments, appId, type);
+        }
+    }
+}