com.facebook.presto.jdbc.internal.guava.graph.AbstractUndirectedNetworkConnections Maven / Gradle / Ivy
/*
* Copyright (C) 2016 The Guava Authors
*
* 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 com.facebook.presto.jdbc.internal.guava.graph;
import static com.facebook.presto.jdbc.internal.guava.base.Preconditions.checkNotNull;
import static com.facebook.presto.jdbc.internal.guava.base.Preconditions.checkState;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
/**
* A base implementation of {@link NetworkConnections} for undirected networks.
*
* @author James Sexton
* @param Node parameter type
* @param Edge parameter type
*/
abstract class AbstractUndirectedNetworkConnections implements NetworkConnections {
/** Keys are edges incident to the origin node, values are the node at the other end. */
protected final Map incidentEdgeMap;
protected AbstractUndirectedNetworkConnections(Map incidentEdgeMap) {
this.incidentEdgeMap = checkNotNull(incidentEdgeMap);
}
@Override
public Set predecessors() {
return adjacentNodes();
}
@Override
public Set successors() {
return adjacentNodes();
}
@Override
public Set incidentEdges() {
return Collections.unmodifiableSet(incidentEdgeMap.keySet());
}
@Override
public Set inEdges() {
return incidentEdges();
}
@Override
public Set outEdges() {
return incidentEdges();
}
@Override
public N adjacentNode(E edge) {
return checkNotNull(incidentEdgeMap.get(edge));
}
@Override
public N removeInEdge(E edge, boolean isSelfLoop) {
if (!isSelfLoop) {
return removeOutEdge(edge);
}
return null;
}
@Override
public N removeOutEdge(E edge) {
N previousNode = incidentEdgeMap.remove(edge);
return checkNotNull(previousNode);
}
@Override
public void addInEdge(E edge, N node, boolean isSelfLoop) {
if (!isSelfLoop) {
addOutEdge(edge, node);
}
}
@Override
public void addOutEdge(E edge, N node) {
N previousNode = incidentEdgeMap.put(edge, node);
checkState(previousNode == null);
}
}
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