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/*
* Copyright 2014 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.openflow.controller;
import org.projectfloodlight.openflow.util.HexString;
import java.net.URI;
import java.net.URISyntaxException;
import static com.google.common.base.Preconditions.checkArgument;
import static org.onlab.util.Tools.fromHex;
import static org.onlab.util.Tools.toHex;
/**
* The class representing a network switch DPID.
* This class is immutable.
*/
public final class Dpid {
private static final String SCHEME = "of";
private static final long UNKNOWN = 0;
private final long value;
/**
* Default constructor.
*/
public Dpid() {
this.value = Dpid.UNKNOWN;
}
/**
* Constructor from a long value.
*
* @param value the value to use.
*/
public Dpid(long value) {
this.value = value;
}
/**
* Constructor from a string.
*
* @param value the value to use.
*/
public Dpid(String value) {
this.value = HexString.toLong(value);
}
/**
* Get the value of the DPID.
*
* @return the value of the DPID.
*/
public long value() {
return value;
}
/**
* Convert the DPID value to a ':' separated hexadecimal string.
*
* @return the DPID value as a ':' separated hexadecimal string.
*/
@Override
public String toString() {
return HexString.toHexString(this.value);
}
@Override
public boolean equals(Object other) {
if (!(other instanceof Dpid)) {
return false;
}
Dpid otherDpid = (Dpid) other;
return value == otherDpid.value;
}
@Override
public int hashCode() {
return Long.hashCode(value);
}
/**
* Returns DPID created from the given device URI.
*
* @param uri device URI
* @return dpid
*/
public static Dpid dpid(URI uri) {
checkArgument(uri.getScheme().equals(SCHEME), "Unsupported URI scheme");
return new Dpid(fromHex(uri.getSchemeSpecificPart()));
}
/**
* Produces device URI from the given DPID.
*
* @param dpid device dpid
* @return device URI
*/
public static URI uri(Dpid dpid) {
return uri(dpid.value);
}
/**
* Produces device URI from the given DPID long.
*
* @param value device dpid as long
* @return device URI
*/
public static URI uri(long value) {
try {
return new URI(SCHEME, toHex(value), null);
} catch (URISyntaxException e) {
return null;
}
}
}
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