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/*
* Copyright (C) 2014 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.common.annotations.Beta;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
/**
* A subinterface of {@link Network} which adds mutation methods. When mutation is not required,
* users should prefer the {@link Network} interface.
*
* @author James Sexton
* @author Joshua O'Madadhain
* @param <N> Node parameter type
* @param <E> Edge parameter type
* @since 20.0
*/
@Beta
public interface MutableNetwork<N, E> extends Network<N, E> {
/**
* Adds {@code node} if it is not already present.
*
* <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
*
* @return {@code true} if the network was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean addNode(N node);
/**
* Adds {@code edge} connecting {@code nodeU} to {@code nodeV}.
*
* <p>If the graph is directed, {@code edge} will be directed in this graph; otherwise, it will be
* undirected.
*
* <p><b>{@code edge} must be unique to this graph</b>, just as a {@code Map} key must be. It must
* also be non-null.
*
* <p>If {@code nodeU} and {@code nodeV} are not already present in this graph, this method will
* silently {@link #addNode(Object) add} {@code nodeU} and {@code nodeV} to the graph.
*
* <p>If {@code edge} already connects {@code nodeU} to {@code nodeV} (in the specified order if
* this network {@link #isDirected()}, else in any order), then this method will have no effect.
*
* @return {@code true} if the network was modified as a result of this call
* @throws IllegalArgumentException if {@code edge} already exists in the graph and does not
* connect {@code nodeU} to {@code nodeV}
* @throws IllegalArgumentException if the introduction of the edge would violate {@link
* #allowsParallelEdges()} or {@link #allowsSelfLoops()}
*/
@CanIgnoreReturnValue
boolean addEdge(N nodeU, N nodeV, E edge);
/**
* Adds {@code edge} connecting {@code endpoints}. In an undirected network, {@code edge} will
* also connect {@code nodeV} to {@code nodeU}.
*
* <p>If this graph is directed, {@code edge} will be directed in this graph; if it is undirected,
* {@code edge} will be undirected in this graph.
*
* <p>If this graph is directed, {@code endpoints} must be ordered.
*
* <p><b>{@code edge} must be unique to this graph</b>, just as a {@code Map} key must be. It must
* also be non-null.
*
* <p>If either or both endpoints are not already present in this graph, this method will silently
* {@link #addNode(Object) add} each missing endpoint to the graph.
*
* <p>If {@code edge} already connects an endpoint pair equal to {@code endpoints}, then this
* method will have no effect.
*
* @return {@code true} if the network was modified as a result of this call
* @throws IllegalArgumentException if {@code edge} already exists in the graph and connects some
* other endpoint pair that is not equal to {@code endpoints}
* @throws IllegalArgumentException if the introduction of the edge would violate {@link
* #allowsParallelEdges()} or {@link #allowsSelfLoops()}
* @throws IllegalArgumentException if the endpoints are unordered and the graph is directed
* @since 27.1
*/
@CanIgnoreReturnValue
boolean addEdge(EndpointPair<N> endpoints, E edge);
/**
* Removes {@code node} if it is present; all edges incident to {@code node} will also be removed.
*
* @return {@code true} if the network was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean removeNode(N node);
/**
* Removes {@code edge} from this network, if it is present.
*
* @return {@code true} if the network was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean removeEdge(E edge);
}
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