com.facebook.presto.jdbc.internal.guava.graph.UndirectedGraphConnections 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.graph.GraphConstants.INNER_CAPACITY;
import static com.facebook.presto.jdbc.internal.guava.graph.GraphConstants.INNER_LOAD_FACTOR;
import com.facebook.presto.jdbc.internal.guava.collect.ImmutableMap;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* An implementation of {@link GraphConnections} for undirected graphs.
*
* @author James Sexton
* @param Node parameter type
* @param Value parameter type
*/
final class UndirectedGraphConnections implements GraphConnections {
private final Map adjacentNodeValues;
private UndirectedGraphConnections(Map adjacentNodeValues) {
this.adjacentNodeValues = checkNotNull(adjacentNodeValues);
}
static UndirectedGraphConnections of() {
return new UndirectedGraphConnections<>(new HashMap(INNER_CAPACITY, INNER_LOAD_FACTOR));
}
static UndirectedGraphConnections ofImmutable(Map adjacentNodeValues) {
return new UndirectedGraphConnections<>(ImmutableMap.copyOf(adjacentNodeValues));
}
@Override
public Set adjacentNodes() {
return Collections.unmodifiableSet(adjacentNodeValues.keySet());
}
@Override
public Set predecessors() {
return adjacentNodes();
}
@Override
public Set successors() {
return adjacentNodes();
}
@Override
public V value(N node) {
return adjacentNodeValues.get(node);
}
@Override
public void removePredecessor(N node) {
@SuppressWarnings("unused")
V unused = removeSuccessor(node);
}
@Override
public V removeSuccessor(N node) {
return adjacentNodeValues.remove(node);
}
@Override
public void addPredecessor(N node, V value) {
@SuppressWarnings("unused")
V unused = addSuccessor(node, value);
}
@Override
public V addSuccessor(N node, V value) {
return adjacentNodeValues.put(node, value);
}
}
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