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/*
 * 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); }





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