/**
* Adds all elements of {@code graph} to the graph being built.
*
* @throws IllegalArgumentException under either of two conditions: (1) the {@code GraphConfig}
* objects held by the graph being built and by {@code graph} are not compatible (2) calling
* {@code Graph.addEdge(e, n1, n2)} on the graph being built throws IAE
* @see Graph#addEdge(e, n1, n2)
*/
public Builder<N, E> addGraph(UndirectedGraph<N, E> graph) {
checkArgument(
undirectedGraph.config().compatibleWith(graph.config()),
"GraphConfigs for input and for graph being built are not compatible: input: %s, "
+ "this graph: %s",
graph.config(),
undirectedGraph.config());
for (N node : graph.nodes()) {
undirectedGraph.addNode(node);
}
for (E edge : graph.edges()) {
Graphs.addEdge(undirectedGraph, edge, graph.incidentNodes(edge));
}
return this;
}
/** Creates a new builder with the default graph configuration. */
public Builder() {
this(Graphs.<N, E>createUndirected());
}
/** Creates a new builder with the specified configuration. */
public Builder(GraphConfig config) {
this(Graphs.<N, E>createUndirected(config));
}
@Override
public boolean equals(@Nullable Object object) {
return (object instanceof UndirectedGraph) && Graphs.equal(this, (UndirectedGraph) object);
}