com.facebook.presto.jdbc.internal.guava.graph.DirectedNetworkConnections 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.graph.GraphConstants.EXPECTED_DEGREE;
import com.facebook.presto.jdbc.internal.guava.collect.BiMap;
import com.facebook.presto.jdbc.internal.guava.collect.HashBiMap;
import com.facebook.presto.jdbc.internal.guava.collect.ImmutableBiMap;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
/**
* An implementation of {@link NetworkConnections} for directed networks.
*
* @author James Sexton
* @param Node parameter type
* @param Edge parameter type
*/
final class DirectedNetworkConnections extends AbstractDirectedNetworkConnections {
protected DirectedNetworkConnections(
Map inEdgeMap, Map outEdgeMap, int selfLoopCount) {
super(inEdgeMap, outEdgeMap, selfLoopCount);
}
static DirectedNetworkConnections of() {
return new DirectedNetworkConnections<>(
HashBiMap.create(EXPECTED_DEGREE), HashBiMap.create(EXPECTED_DEGREE), 0);
}
static DirectedNetworkConnections ofImmutable(
Map inEdges, Map outEdges, int selfLoopCount) {
return new DirectedNetworkConnections<>(
ImmutableBiMap.copyOf(inEdges), ImmutableBiMap.copyOf(outEdges), selfLoopCount);
}
@Override
public Set predecessors() {
return Collections.unmodifiableSet(((BiMap) inEdgeMap).values());
}
@Override
public Set successors() {
return Collections.unmodifiableSet(((BiMap) outEdgeMap).values());
}
@Override
public Set edgesConnecting(N node) {
return new EdgesConnecting(((BiMap) outEdgeMap).inverse(), node);
}
}
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