/*
 * 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 com.google.common.collect.ImmutableList;
import org.onosproject.net.flow.FlowRuleBatchOperation;
import org.onosproject.net.intent.Intent;

import java.util.List;
import java.util.Optional;

import static com.google.common.base.Preconditions.checkNotNull;

class Withdrawing implements IntentUpdate {

    // TODO: define an interface and use it, instead of IntentManager
    private final IntentManager intentManager;
    private final Intent intent;
    private final List<Intent> installables;

    Withdrawing(IntentManager intentManager, Intent intent, List<Intent> installables) {
        this.intentManager = checkNotNull(intentManager);
        this.intent = checkNotNull(intent);
        this.installables = ImmutableList.copyOf(installables);
    }

    @Override
    public Optional<IntentUpdate> execute() {
        List<FlowRuleBatchOperation> batches = intentManager.uninstallIntent(intent, installables);

        return Optional.of(new Withdrawn(intentManager, intent, installables, batches));
    }
}