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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.ui.topo;
import org.onosproject.net.Link;
import org.onosproject.net.LinkKey;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Represents a collection of {@link BiLink} concrete classes. These maps
* are used to collate a set of unidirectional {@link Link}s into a smaller
* set of bi-directional {@link BiLink} derivatives.
* <p>
* @param <B> the type of bi-link subclass
*/
public abstract class BiLinkMap<B extends BiLink> {
private final Map<LinkKey, B> map = new HashMap<>();
/**
* Creates a new instance of a bi-link. Concrete subclasses should
* instantiate and return the appropriate bi-link subclass.
*
* @param key the link key
* @param link the initial link
* @return a new instance
*/
protected abstract B create(LinkKey key, Link link);
/**
* Adds the given link to our collection, returning the corresponding
* bi-link (creating one if needed necessary).
*
* @param link the link to add to the collection
* @return the corresponding bi-link wrapper
*/
public B add(Link link) {
LinkKey key = TopoUtils.canonicalLinkKey(checkNotNull(link));
B blink = map.get(key);
if (blink == null) {
// no bi-link yet exists for this link
blink = create(key, link);
map.put(key, blink);
} else {
// we have a bi-link for this link.
if (!blink.one().equals(link)) {
blink.setOther(link);
}
}
return blink;
}
/**
* Returns the bi-link instances in the collection.
*
* @return the bi-links in this map
*/
public Collection<B> biLinks() {
return map.values();
}
/**
* Returns the number of bi-links in the collection.
*
* @return number of bi-links
*/
public int size() {
return map.size();
}
}
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