/**
 *    Copyright 2011, Big Switch Networks, Inc.
 *    Originally created by David Erickson, Stanford University
 *
 *    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 net.onrc.onos.core.linkdiscovery;

import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
import net.floodlightcontroller.core.web.serializers.UShortSerializer;

import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.openflow.util.HexString;

public class Link {
    private long src;
    private short srcPort;
    private long dst;
    private short dstPort;


    public Link(long srcId, short srcPort, long dstId, short dstPort) {
        this.src = srcId;
        this.srcPort = srcPort;
        this.dst = dstId;
        this.dstPort = dstPort;
    }

    // Convenience method
    public Link(long srcId, int srcPort, long dstId, int dstPort) {
        this.src = srcId;
        this.srcPort = (short) srcPort;
        this.dst = dstId;
        this.dstPort = (short) dstPort;
    }

    @JsonProperty("src-switch")
    @JsonSerialize(using = DPIDSerializer.class)
    public long getSrc() {
        return src;
    }

    @JsonProperty("src-port")
    @JsonSerialize(using = UShortSerializer.class)
    public short getSrcPort() {
        return srcPort;
    }

    @JsonProperty("dst-switch")
    @JsonSerialize(using = DPIDSerializer.class)
    public long getDst() {
        return dst;
    }

    @JsonProperty("dst-port")
    @JsonSerialize(using = UShortSerializer.class)
    public short getDstPort() {
        return dstPort;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (int) (dst ^ (dst >>> 32));
        result = prime * result + dstPort;
        result = prime * result + (int) (src ^ (src >>> 32));
        result = prime * result + srcPort;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Link other = (Link) obj;
        if (dst != other.dst) {
            return false;
        }
        if (dstPort != other.dstPort) {
            return false;
        }
        if (src != other.src) {
            return false;
        }
        if (srcPort != other.srcPort) {
            return false;
        }
        return true;
    }


    @Override
    public String toString() {
        return "Link [src=" + HexString.toHexString(this.src)
                + " outPort="
                + (srcPort & 0xffff)
                + ", dst=" + HexString.toHexString(this.dst)
                + ", inPort="
                + (dstPort & 0xffff)
                + "]";
    }

    public String toKeyString() {
        return (HexString.toHexString(this.src) + "|" +
                (this.srcPort & 0xffff) + "|" +
                HexString.toHexString(this.dst) + "|" +
                (this.dstPort & 0xffff));
    }
}