/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.openflowplugin.impl.registry.flow;

import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import java.math.BigInteger;
import org.opendaylight.openflowplugin.api.OFConstants;
import org.opendaylight.openflowplugin.api.openflow.registry.flow.FlowRegistryKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.Flow;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.flow.Match;

/**
 * Created by Martin Bobak <mbobak@cisco.com> on 8.4.2015.
 */
public class FlowRegistryKeyFactory {


    public FlowRegistryKeyFactory() {
    }

    public static FlowRegistryKey create(Flow flow) {
        return new FlowRegistryKeyDto(flow);
    }

    private static final class FlowRegistryKeyDto implements FlowRegistryKey {

        private final short tableId;
        private final int priority;
        private final BigInteger cookie;
        private final Match match;

        public FlowRegistryKeyDto(final Flow flow) {
            tableId = Preconditions.checkNotNull(flow.getTableId(), "flow tableId must not be null");
            priority = Preconditions.checkNotNull(flow.getPriority(), "flow priority must not be null");
            match = Preconditions.checkNotNull(flow.getMatch(), "Match value must not be null");
            cookie = MoreObjects.firstNonNull(flow.getCookie(), OFConstants.DEFAULT_FLOW_COOKIE).getValue();
        }

        @Override
        public boolean equals(final Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;

            final FlowRegistryKeyDto that = (FlowRegistryKeyDto) o;

            if (priority != that.priority) return false;
            if (tableId != that.tableId) return false;
            if (!match.equals(that.match)) return false;

            return true;
        }

        @Override
        public int hashCode() {
            int result = (int) tableId;
            result = 31 * result + priority;
            result = 31 * result + match.hashCode();
            return result;
        }

        @Override
        public short getTableId() {
            return tableId;
        }

        @Override
        public int getPriority() {
            return priority;
        }

        @Override
        public BigInteger getCookie() {
            return cookie;
        }
    }
}