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/*
* (C) Copyright 2013-2023, by Alexey Kudinkin and Contributors.
*
* JGraphT : a free Java graph-theory library
*
* See the CONTRIBUTORS.md file distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the
* GNU Lesser General Public License v2.1 or later
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
*
* SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
*/
package org.jgrapht.alg.interfaces;
import java.io.*;
import java.util.*;
/**
* An algorithm which computes a spanning
* tree of a given connected graph. In the case of disconnected graphs it would rather derive a
* spanning forest.
*
* @param the graph edge type
*/
public interface SpanningTreeAlgorithm
{
/**
* Computes a spanning tree.
*
* @return a spanning tree
*/
SpanningTree getSpanningTree();
/**
* A spanning tree.
*
* @param the graph edge type
*/
interface SpanningTree
extends Iterable
{
/**
* Returns the weight of the spanning tree.
*
* @return weight of the spanning tree
*/
double getWeight();
/**
* Set of edges of the spanning tree.
*
* @return edge set of the spanning tree
*/
Set getEdges();
/**
* Returns an iterator over the edges in the spanning tree.
*
* @return iterator over the edges in the spanning tree.
*/
@Override
default Iterator iterator()
{
return getEdges().iterator();
}
}
/**
* Default implementation of the spanning tree interface.
*
* @param the graph edge type
*/
class SpanningTreeImpl
implements SpanningTree, Serializable
{
private static final long serialVersionUID = 402707108331703333L;
private final double weight;
private final Set edges;
/**
* Construct a new spanning tree.
*
* @param edges the edges
* @param weight the weight
*/
public SpanningTreeImpl(Set edges, double weight)
{
this.edges = edges;
this.weight = weight;
}
@Override
public double getWeight()
{
return weight;
}
@Override
public Set getEdges()
{
return edges;
}
@Override
public String toString()
{
return "Spanning-Tree [weight=" + weight + ", edges=" + edges + "]";
}
}
}