[Cardinal] Add builders for Intents and remove extra constructors.

Starting with PointToPoint intent to see how it looks

Change-Id: I5366a05d657ceaad18c03b95cd71f5d1107200e2
diff --git a/core/api/src/main/java/org/onosproject/net/intent/PointToPointIntent.java b/core/api/src/main/java/org/onosproject/net/intent/PointToPointIntent.java
index 2df7b8b..5f80d9a 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/PointToPointIntent.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/PointToPointIntent.java
@@ -15,18 +15,16 @@
  */
 package org.onosproject.net.intent;
 
-import com.google.common.base.MoreObjects;
-import com.google.common.collect.ImmutableList;
-import org.onosproject.core.ApplicationId;
-import org.onosproject.net.ConnectPoint;
-import org.onosproject.net.Link;
-import org.onosproject.net.flow.TrafficSelector;
-import org.onosproject.net.flow.TrafficTreatment;
-import org.onosproject.net.intent.constraint.LinkTypeConstraint;
-
 import java.util.Collections;
 import java.util.List;
 
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+
+import com.google.common.base.MoreObjects;
+
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -39,6 +37,103 @@
     private final ConnectPoint egressPoint;
 
     /**
+     * Returns a new point to point intent builder. The application id,
+     * ingress point and egress point are required fields.  If they are
+     * not set by calls to the appropriate methods, an exception will
+     * be thrown.
+     *
+     * @return point to point builder
+     */
+    public static PointToPointIntent.Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder of a point to point intent.
+     */
+    public static final class Builder extends ConnectivityIntent.Builder {
+        ConnectPoint ingressPoint;
+        ConnectPoint egressPoint;
+
+        private Builder() {
+            // Hide constructor
+        }
+
+        @Override
+        public Builder appId(ApplicationId appId) {
+            return (Builder) super.appId(appId);
+        }
+
+        @Override
+        public Builder key(Key key) {
+            return (Builder) super.key(key);
+        }
+
+        @Override
+        public Builder selector(TrafficSelector selector) {
+            return (Builder) super.selector(selector);
+        }
+
+        @Override
+        public Builder treatment(TrafficTreatment treatment) {
+            return (Builder) super.treatment(treatment);
+        }
+
+        @Override
+        public Builder constraints(List<Constraint> constraints) {
+            return (Builder) super.constraints(constraints);
+        }
+
+        @Override
+        public Builder priority(int priority) {
+            return (Builder) super.priority(priority);
+        }
+
+        /**
+         * Sets the ingress point of the point to point intent that will be built.
+         *
+         * @param ingressPoint ingress connect point
+         * @return this builder
+         */
+        public Builder ingressPoint(ConnectPoint ingressPoint) {
+            this.ingressPoint = ingressPoint;
+            return this;
+        }
+
+        /**
+         * Sets the egress point of the point to point intent that will be built.
+         *
+         * @param egressPoint egress connect point
+         * @return this builder
+         */
+        public Builder egressPoint(ConnectPoint egressPoint) {
+            this.egressPoint = egressPoint;
+            return this;
+        }
+
+        /**
+         * Builds a point to point intent from the accumulated parameters.
+         *
+         * @return point to point intent
+         */
+        public PointToPointIntent build() {
+
+            return new PointToPointIntent(
+                    appId,
+                    key,
+                    selector,
+                    treatment,
+                    ingressPoint,
+                    egressPoint,
+                    constraints,
+                    priority
+            );
+        }
+    }
+
+
+
+    /**
      * Creates a new point-to-point intent with the supplied ingress/egress
      * ports and constraints.
      *
@@ -50,9 +145,10 @@
      * @param egressPoint  egress port
      * @param constraints  optional list of constraints
      * @param priority     priority to use for flows generated by this intent
-     * @throws NullPointerException if {@code ingressPoint} or {@code egressPoints} is null.
+     * @throws NullPointerException if {@code ingressPoint} or
+     *        {@code egressPoints} or {@code appId} is null.
      */
-    public PointToPointIntent(ApplicationId appId,
+    private PointToPointIntent(ApplicationId appId,
                               Key key,
                               TrafficSelector selector,
                               TrafficTreatment treatment,
@@ -73,57 +169,6 @@
     }
 
     /**
-     * Creates a new point-to-point intent with the supplied ingress/egress
-     * ports and with built-in link type constraint to avoid optical links.
-     *
-     * @param appId        application identifier
-     * @param selector     traffic selector
-     * @param treatment    treatment
-     * @param ingressPoint ingress port
-     * @param egressPoint  egress port
-     * @throws NullPointerException if {@code ingressPoint} or {@code egressPoints} is null.
-     */
-    public PointToPointIntent(ApplicationId appId, TrafficSelector selector,
-                              TrafficTreatment treatment,
-                              ConnectPoint ingressPoint,
-                              ConnectPoint egressPoint) {
-        this(appId, null, selector, treatment, ingressPoint, egressPoint,
-             ImmutableList.of(new LinkTypeConstraint(false, Link.Type.OPTICAL)),
-                DEFAULT_INTENT_PRIORITY);
-    }
-
-    /**
-     * Creates a new point-to-point intent with the supplied ingress/egress
-     * ports and constraints.
-     *
-     * @param appId        application identifier
-     * @param selector     traffic selector
-     * @param treatment    treatment
-     * @param ingressPoint ingress port
-     * @param egressPoint  egress port
-     * @param constraints  optional list of constraints
-     * @param priority     priority to use for flows generated by this intent
-     * @throws NullPointerException if {@code ingressPoint} or {@code egressPoints} is null.
-     */
-    public PointToPointIntent(ApplicationId appId, TrafficSelector selector,
-                              TrafficTreatment treatment,
-                              ConnectPoint ingressPoint,
-                              ConnectPoint egressPoint,
-                              List<Constraint> constraints,
-                              int priority) {
-        super(appId, null, Collections.emptyList(), selector, treatment,
-                constraints, priority);
-
-        checkNotNull(ingressPoint);
-        checkNotNull(egressPoint);
-        checkArgument(!ingressPoint.equals(egressPoint),
-                "ingress and egress should be different (ingress: %s, egress: %s)", ingressPoint, egressPoint);
-
-        this.ingressPoint = ingressPoint;
-        this.egressPoint = egressPoint;
-    }
-
-    /**
      * Constructor for serializer.
      */
     protected PointToPointIntent() {