Initial work for adding flow-objective backed intents.

Split installation work from IntentManager into IntentInstaller helper class.

Change-Id: If926ce975d005abee4f22f2b05404de328d94203
diff --git a/core/api/src/main/java/org/onosproject/net/intent/FlowObjectiveIntent.java b/core/api/src/main/java/org/onosproject/net/intent/FlowObjectiveIntent.java
new file mode 100644
index 0000000..18dcb6e
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/intent/FlowObjectiveIntent.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2016 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.intent;
+
+import com.google.common.base.MoreObjects;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.NetworkResource;
+import org.onosproject.net.flowobjective.Objective;
+
+import java.util.Collection;
+
+/**
+ * Intent expressed as (and backed by) a collection of flow objectives through
+ * which the intent is to be accomplished.
+ */
+public class FlowObjectiveIntent extends Intent {
+
+    private final Collection<Objective> objectives;
+
+    /**
+     * Constructor for serialization.
+     */
+    protected FlowObjectiveIntent() {
+        super();
+        this.objectives = null;
+    }
+
+    /**
+     * Creates a flow objective intent with the specified objectives and
+     * resources.
+     *
+     * @param appId      application id
+     * @param objectives backing flow objectives
+     * @param resources  backing network resources
+     */
+    public FlowObjectiveIntent(ApplicationId appId,
+                               Collection<Objective> objectives,
+                               Collection<NetworkResource> resources) {
+        this(appId, null, objectives, resources);
+    }
+
+    /**
+     * Creates a flow objective intent with the specified objectives and
+     * resources.
+     *
+     * @param appId      application id
+     * @param key        intent key
+     * @param objectives backing flow objectives
+     * @param resources  backing network resources
+     */
+    public FlowObjectiveIntent(ApplicationId appId, Key key,
+                               Collection<Objective> objectives,
+                               Collection<NetworkResource> resources) {
+        super(appId, key, resources, DEFAULT_INTENT_PRIORITY);
+        this.objectives = objectives;
+    }
+
+    /**
+     * Returns the collection of backing flow objectives.
+     *
+     * @return flow objectives
+     */
+    Collection<Objective> objectives() {
+        return objectives;
+    }
+
+
+    @Override
+    public boolean isInstallable() {
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("id", id())
+                .add("key", key())
+                .add("appId", appId())
+                .add("resources", resources())
+                .add("objectives", objectives)
+                .toString();
+    }
+}