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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;
import com.google.errorprone.annotations.CompatibleWith;
/**
* A subinterface of {@link Graph} which adds mutation methods. When mutation is not required, users
* should prefer the {@link Graph} interface.
*
* @author James Sexton
* @author Joshua O'Madadhain
* @param Node parameter type
* @since 20.0
*/
@Beta
public interface MutableGraph extends Graph {
/**
* Adds {@code node} if it is not already present.
*
* Nodes must be unique, just as {@code Map} keys must be. They must also be non-null.
*
* @return {@code true} if the graph was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean addNode(N node);
/**
* Adds an edge connecting {@code nodeU} to {@code nodeV} if one is not already present. In an
* undirected graph, the edge will also connect {@code nodeV} to {@code nodeU}.
*
*
Behavior if {@code nodeU} and {@code nodeV} are not already present in this graph is
* implementation-dependent. Suggested behaviors include (a) silently {@link #addNode(Object)
* adding} {@code nodeU} and {@code nodeV} to the graph (this is the behavior of the default
* implementations) or (b) throwing {@code IllegalArgumentException}.
*
* @return {@code true} if the graph was modified as a result of this call
* @throws IllegalArgumentException if the introduction of the edge would violate {@link
* #allowsSelfLoops()}
*/
@CanIgnoreReturnValue
boolean putEdge(N nodeU, N nodeV);
/**
* Removes {@code node} if it is present; all edges incident to {@code node} will also be removed.
*
* @return {@code true} if the graph was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean removeNode(@CompatibleWith("N") Object node);
/**
* Removes the edge connecting {@code nodeU} to {@code nodeV}, if it is present.
*
* @return {@code true} if the graph was modified as a result of this call
*/
@CanIgnoreReturnValue
boolean removeEdge(@CompatibleWith("N") Object nodeU, @CompatibleWith("N") Object nodeV);
}