/*
 * 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.phase;

import org.onosproject.net.intent.IntentData;
import org.onosproject.net.intent.impl.IntentProcessor;

import java.util.Objects;
import java.util.Optional;

/**
 * Represents a phase of processing an intent.
 */
public interface IntentProcessPhase {

    /**
     * Execute the procedure represented by the instance
     * and generates the next update instance.
     *
     * @return next update
     */
    Optional<IntentProcessPhase> execute();

    /**
     * Create a starting intent process phase according to intent data this class holds.
     *
     * @param processor intent processor to be passed to intent process phases
     *                  generated while this instance is working
     * @param data intent data to be processed
     * @param current intent date that is stored in the store
     * @return starting intent process phase
     */
    static IntentProcessPhase newInitialPhase(IntentProcessor processor,
                                              IntentData data, IntentData current) {
        switch (data.request()) {
            case INSTALL_REQ:
                return new InstallRequest(processor, data, Optional.ofNullable(current));
            case WITHDRAW_REQ:
                return new WithdrawRequest(processor, data, Optional.ofNullable(current));
            case PURGE_REQ:
                return new PurgeRequest(data, Optional.ofNullable(current));
            default:
                // illegal state
                return new Failed(data);
        }
    }

    static void transferErrorCount(IntentData data, Optional<IntentData> stored) {
        if (stored.isPresent()) {
            IntentData storedData = stored.get();
            if (Objects.equals(data.intent(), storedData.intent()) &&
                    Objects.equals(data.request(), storedData.request())) {
                data.setErrorCount(storedData.errorCount());
            } else {
                data.setErrorCount(0);
            }
        }
    }

}

@@ -13,16 +13,21 @@
 ght 2015
+-2016
  Open Ne
@@ -2262,20 +2262,16 @@
     
-if (
 stored.i
 sPre
@@ -2270,17 +2270,17 @@
 ed.i
-s
+f
 Present(
 )) %7B
@@ -2279,62 +2279,23 @@
 ent(
-)) %7B%0A            IntentData storedData = stored.get();
+storedData -%3E %7B
 %0A   
@@ -2581,18 +2581,19 @@
        %7D
+);
 %0A    %7D%0A
-%0A
 %7D%0A

use ifPresent() instead of isPresent()