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/*
* 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;
import com.google.common.annotations.Beta;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import org.onosproject.core.ApplicationId;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
/**
* Key class for Intents.
*/
// TODO maybe pull this up to utils
@Beta
public abstract class Key implements Comparable<Key> {
//TODO consider making this a HashCode object (worry about performance)
private final long hash;
private static final HashFunction HASH_FN = Hashing.md5();
protected Key(long hash) {
this.hash = hash;
}
public long hash() {
return hash;
}
@Override
public int hashCode() {
return Long.hashCode(hash);
}
@Override
public abstract boolean equals(Object obj);
/**
* Creates a key based on the provided string.
* <p>
* Note: Two keys with equal value, but different appId, are not equal.
* </p>
*
* @param key the provided string
* @param appId application id to associate with this key
* @return the key for the string
*/
public static Key of(String key, ApplicationId appId) {
return new StringKey(key, appId);
}
/**
* Creates a key based on the provided long.
* <p>
* Note: Two keys with equal value, but different appId, are not equal.
* Also, "10" and 10L are different.
* </p>
*
* @param key the provided long
* @param appId application id to associate with this key
* @return the key for the long
*/
public static Key of(long key, ApplicationId appId) {
return new LongKey(key, appId);
}
private static final class StringKey extends Key {
private final ApplicationId appId;
private final String key;
private StringKey(String key, ApplicationId appId) {
super(HASH_FN.newHasher()
.putShort(appId.id())
.putString(key, StandardCharsets.UTF_8)
.hash().asLong());
this.key = key;
this.appId = appId;
}
@Override
public String toString() {
return key;
}
// checkstyle requires this
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
final StringKey other = (StringKey) obj;
return this.hash() == other.hash() &&
Objects.equals(this.appId, other.appId) &&
Objects.equals(this.key, other.key);
}
@Override
public int compareTo(Key o) {
StringKey sk = (StringKey) o;
return this.key.compareTo(sk.key);
}
}
private static final class LongKey extends Key {
private final ApplicationId appId;
private final long key;
private LongKey(long key, ApplicationId appId) {
super(HASH_FN.newHasher()
.putShort(appId.id())
.putLong(key)
.hash().asLong());
this.key = key;
this.appId = appId;
}
@Override
public String toString() {
return "0x" + Long.toHexString(key);
}
// checkstyle requires this
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
final LongKey other = (LongKey) obj;
return this.hash() == other.hash() &&
this.key == other.key &&
Objects.equals(this.appId, other.appId);
}
@Override
public int compareTo(Key o) {
Long myKey = key;
Long otherKey = ((LongKey) o).key;
return myKey.compareTo(otherKey);
}
}
}
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