com.google.common.graph.NetworkConnections 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.google.common.graph;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Set;
import javax.annotation.CheckForNull;
/**
* An interface for representing and manipulating an origin node's adjacent nodes and incident edges
* in a {@link Network}.
*
* @author James Sexton
* @param Node parameter type
* @param Edge parameter type
*/
@ElementTypesAreNonnullByDefault
interface NetworkConnections {
Set adjacentNodes();
Set predecessors();
Set successors();
Set incidentEdges();
Set inEdges();
Set outEdges();
/**
* Returns the set of edges connecting the origin node to {@code node}. For networks without
* parallel edges, this set cannot be of size greater than one.
*/
Set edgesConnecting(N node);
/**
* Returns the node that is adjacent to the origin node along {@code edge}.
*
* In the directed case, {@code edge} is assumed to be an outgoing edge.
*/
N adjacentNode(E edge);
/**
* Remove {@code edge} from the set of incoming edges. Returns the former predecessor node.
*
*
In the undirected case, returns {@code null} if {@code isSelfLoop} is true.
*/
@CanIgnoreReturnValue
@CheckForNull
N removeInEdge(E edge, boolean isSelfLoop);
/** Remove {@code edge} from the set of outgoing edges. Returns the former successor node. */
@CanIgnoreReturnValue
N removeOutEdge(E edge);
/**
* Add {@code edge} to the set of incoming edges. Implicitly adds {@code node} as a predecessor.
*/
void addInEdge(E edge, N node, boolean isSelfLoop);
/** Add {@code edge} to the set of outgoing edges. Implicitly adds {@code node} as a successor. */
void addOutEdge(E edge, N node);
}