/*
 * Copyright 2014-2015 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.host;

import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

import org.onlab.packet.MacAddress;
import org.onlab.packet.VlanId;
import org.onosproject.net.ConnectPoint;

import com.google.common.base.MoreObjects;

/**
 * Represents address information bound to a port.
 */
public final class PortAddresses {

    private final ConnectPoint connectPoint;
    private final Set<InterfaceIpAddress> ipAddresses;
    private final MacAddress macAddress;
    private final VlanId vlan;

    /**
     * Constructs a PortAddresses object for the given connection point, with a
     * set of IP addresses and a MAC address. Both address parameters are
     * optional and can be set to null.
     *
     * @param connectPoint the connection point these addresses are for
     * @param ipAddresses a set of interface IP addresses
     * @param mac a MAC address
     * @param vlan a VLAN ID
     */
    public PortAddresses(ConnectPoint connectPoint,
            Set<InterfaceIpAddress> ipAddresses, MacAddress mac, VlanId vlan) {
        this.connectPoint = connectPoint;
        this.ipAddresses = (ipAddresses == null) ?
            Collections.<InterfaceIpAddress>emptySet()
            : new HashSet<>(ipAddresses);
        this.macAddress = mac;
        this.vlan = vlan;
    }

    /**
     * Returns the connection point this address information is bound to.
     *
     * @return the connection point
     */
    public ConnectPoint connectPoint() {
        return connectPoint;
    }

    /**
     * Returns the set of interface IP addresses.
     *
     * @return the interface IP addresses
     */
    public Set<InterfaceIpAddress> ipAddresses() {
        return ipAddresses;
    }

    /**
     * Returns the MAC address.
     *
     * @return the MAC address
     */
    public MacAddress mac() {
        return macAddress;
    }

    /**
     * Returns the VLAN ID.
     *
     * @return the VLAN ID
     */
    public VlanId vlan() {
        return vlan;
    }

    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }

        if (!(other instanceof PortAddresses)) {
            return false;
        }

        PortAddresses otherPa = (PortAddresses) other;

        return Objects.equals(this.connectPoint, otherPa.connectPoint)
                && Objects.equals(this.ipAddresses, otherPa.ipAddresses)
                && Objects.equals(this.macAddress, otherPa.macAddress)
                && Objects.equals(this.vlan, otherPa.vlan);
    }

    @Override
    public int hashCode() {
        return Objects.hash(connectPoint, ipAddresses, macAddress, vlan);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(getClass())
            .add("connect-point", connectPoint)
            .add("ip-addresses", ipAddresses)
            .add("mac-address", macAddress)
            .add("vlan", vlan)
            .toString();
    }
}