Split Withdrawing class into two classes WithdrawCoordinating and Withdrawing

Resolve ONOS-992
- Rename Coordinating to InstallCoordinating for naming consistency
- Add Javadoc to newly added/modified classes
- Rename uninstallIntent() to uninstallCoordinate() in IntentManager
- Rename coordinate() to installCoordinate() in IntentManager

Change-Id: I226592d96cfd8caf248addab2db0d28803c7ca12
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/WithdrawCoordinating.java b/core/net/src/main/java/org/onosproject/net/intent/impl/WithdrawCoordinating.java
new file mode 100644
index 0000000..9dd1019
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/WithdrawCoordinating.java
@@ -0,0 +1,47 @@
+/*
+ * 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.intent.impl;
+
+import org.onosproject.net.flow.FlowRuleOperations;
+import org.onosproject.net.intent.IntentData;
+
+import java.util.Optional;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Represents a phase to create a {@link FlowRuleOperations} instance
+ * with using registered intent installers.
+ */
+class WithdrawCoordinating implements IntentUpdate {
+
+    // TODO: define an interface and use it, instead of IntentManager
+    private final IntentManager intentManager;
+    private final IntentData pending;
+    private final IntentData current;
+
+    WithdrawCoordinating(IntentManager intentManager, IntentData pending, IntentData current) {
+        this.intentManager = checkNotNull(intentManager);
+        this.pending = checkNotNull(pending);
+        this.current = checkNotNull(current);
+    }
+
+    @Override
+    public Optional<IntentUpdate> execute() {
+        FlowRuleOperations flowRules = intentManager.uninstallCoordinate(current);
+        return Optional.of(new Withdrawing(intentManager, pending, flowRules));
+    }
+}