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@@ -8,68 +8,105 @@ import java.util.List;
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* <p>
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* Class representing a path between nodes in a graph.
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* </p>
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- *
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+ *
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* <p>
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* A path is represented as a list of {@link Arc} with an origin and not a list
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* of {@link Node} due to the multi-graph nature (multiple arcs between two
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* nodes) of the considered graphs.
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* </p>
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- *
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*/
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public class Path {
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/**
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* Create a new path that goes through the given list of nodes (in order),
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* choosing the fastest route if multiple are available.
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- *
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+ *
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* @param graph Graph containing the nodes in the list.
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* @param nodes List of nodes to build the path.
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- *
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* @return A path that goes through the given list of nodes.
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- *
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* @throws IllegalArgumentException If the list of nodes is not valid, i.e. two
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- * consecutive nodes in the list are not connected in the graph.
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- *
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- * @deprecated Need to be implemented.
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+ * consecutive nodes in the list are not connected in the graph.
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*/
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public static Path createFastestPathFromNodes(Graph graph, List<Node> nodes)
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throws IllegalArgumentException {
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- List<Arc> arcs = new ArrayList<Arc>();
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- // TODO:
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- return new Path(graph, arcs);
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+ return Path.createSmallestPath(graph, nodes, false);
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}
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/**
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* Create a new path that goes through the given list of nodes (in order),
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* choosing the shortest route if multiple are available.
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- *
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+ *
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* @param graph Graph containing the nodes in the list.
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* @param nodes List of nodes to build the path.
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- *
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* @return A path that goes through the given list of nodes.
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- *
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* @throws IllegalArgumentException If the list of nodes is not valid, i.e. two
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- * consecutive nodes in the list are not connected in the graph.
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- *
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- * @deprecated Need to be implemented.
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+ * consecutive nodes in the list are not connected in the graph.
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*/
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public static Path createShortestPathFromNodes(Graph graph, List<Node> nodes)
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throws IllegalArgumentException {
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- List<Arc> arcs = new ArrayList<Arc>();
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- // TODO:
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+ return Path.createSmallestPath(graph, nodes, true);
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+ }
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+
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+ /**
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+ * Create a new path that goes through the given list of nodes (in order),
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+ * choosing the shortest or fastest route if multiple are available.
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+ *
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+ * @param graph Graph containing the nodes in the list.
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+ * @param nodes List of nodes to build the path.
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+ * @param isLength Should we search the shortest path (true) or the fastest path (false)
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+ * @return A path that goes through the given list of nodes.
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+ * @throws IllegalArgumentException If the list of nodes is not valid, i.e. two
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+ * consecutive nodes in the list are not connected in the graph.
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+ */
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+ private static Path createSmallestPath(Graph graph, List<Node> nodes, boolean isLength) {
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+ List<Arc> arcs = new ArrayList<>();
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+ if (nodes.size() != 0 && nodes.size() != 1) {
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+ for (int i = 0; i < (nodes.size() - 1); i++) {
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+ Arc shortest = Path.getSmallestArc(
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+ nodes.get(i).getSuccessors(), nodes.get(i + 1), isLength
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+ );
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+ arcs.add(shortest);
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+ }
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+ } else if (nodes.size() == 1)
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+ return new Path(graph, nodes.get(0));
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return new Path(graph, arcs);
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}
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/**
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+ * Gets the smallest arc in the given list.
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+ * If an arc destination does not match the given node, it is ignored.
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+ *
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+ * @param arcs The arcs list to search in
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+ * @param nextNode The next node to match the arc destination
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+ * @param isLength Should we search the shortest arc (true) or the fastest arc (false)
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+ * @return The smallest arc to nextNode
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+ * @throws IllegalArgumentException If no node is found
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+ */
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+ private static Arc getSmallestArc(List<Arc> arcs, Node nextNode, boolean isLength) {
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+ Arc shortestArc = null;
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+ double smallestComparator = -1;
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+ for (Arc arc : arcs) {
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+ if (nextNode.equals(arc.getDestination())) {
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+ double comparator = isLength ? arc.getLength() : arc.getMinimumTravelTime();
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+ if (comparator < smallestComparator || smallestComparator < 0) {
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+ smallestComparator = comparator;
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+ shortestArc = arc;
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+ }
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+ }
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+ }
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+ if (shortestArc == null)
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+ throw new IllegalArgumentException();
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+ return shortestArc;
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+ }
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+
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+ /**
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* Concatenate the given paths.
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- *
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+ *
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* @param paths Array of paths to concatenate.
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- *
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* @return Concatenated path.
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- *
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* @throws IllegalArgumentException if the paths cannot be concatenated (IDs of
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- * map do not match, or the end of a path is not the beginning of the
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- * next).
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+ * map do not match, or the end of a path is not the beginning of the
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+ * next).
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*/
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public static Path concatenate(Path... paths) throws IllegalArgumentException {
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if (paths.length == 0) {
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@@ -83,7 +120,7 @@ public class Path {
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}
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}
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ArrayList<Arc> arcs = new ArrayList<>();
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- for (Path path: paths) {
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+ for (Path path : paths) {
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arcs.addAll(path.getArcs());
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}
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Path path = new Path(paths[0].getGraph(), arcs);
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@@ -105,7 +142,7 @@ public class Path {
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/**
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* Create an empty path corresponding to the given graph.
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- *
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+ *
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* @param graph Graph containing the path.
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*/
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public Path(Graph graph) {
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@@ -116,9 +153,9 @@ public class Path {
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/**
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* Create a new path containing a single node.
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- *
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+ *
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* @param graph Graph containing the path.
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- * @param node Single node of the path.
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+ * @param node Single node of the path.
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*/
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public Path(Graph graph, Node node) {
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this.graph = graph;
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@@ -128,9 +165,9 @@ public class Path {
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/**
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* Create a new path with the given list of arcs.
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- *
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+ *
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* @param graph Graph containing the path.
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- * @param arcs Arcs to construct the path.
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+ * @param arcs Arcs to construct the path.
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*/
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public Path(Graph graph, List<Arc> arcs) {
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this.graph = graph;
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@@ -168,7 +205,7 @@ public class Path {
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/**
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* Check if this path is empty (it does not contain any node).
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- *
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+ *
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* @return true if this path is empty, false otherwise.
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*/
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public boolean isEmpty() {
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@@ -177,7 +214,7 @@ public class Path {
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/**
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* Get the number of <b>nodes</b> in this path.
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- *
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+ *
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* @return Number of nodes in this path.
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*/
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public int size() {
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@@ -186,7 +223,7 @@ public class Path {
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/**
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* Check if this path is valid.
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- *
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+ * <p>
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* A path is valid if any of the following is true:
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* <ul>
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* <li>it is empty;</li>
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@@ -195,10 +232,8 @@ public class Path {
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* consecutive arcs, the destination of the first one is the origin of the
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* second one.</li>
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* </ul>
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- *
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+ *
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* @return true if the path is valid, false otherwise.
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- *
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- * @deprecated Need to be implemented.
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*/
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public boolean isValid() {
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boolean valid = isEmpty() || (this.arcs.size() == 0 && this.origin != null);
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@@ -206,7 +241,7 @@ public class Path {
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valid = this.arcs.get(0).getOrigin().equals(this.origin);
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for (int i = 1; i < 3; i++) {
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if (this.arcs.size() > i)
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- valid = valid && (this.arcs.get(i).getOrigin().equals(this.arcs.get(i-1).getDestination()));
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+ valid = valid && (this.arcs.get(i).getOrigin().equals(this.arcs.get(i - 1).getDestination()));
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}
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}
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return valid;
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@@ -214,9 +249,8 @@ public class Path {
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/**
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* Compute the length of this path (in meters).
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- *
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- * @return Total length of the path (in meters).
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*
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+ * @return Total length of the path (in meters).
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*/
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public float getLength() {
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float length = 0;
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@@ -228,12 +262,10 @@ public class Path {
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/**
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* Compute the time required to travel this path if moving at the given speed.
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- *
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+ *
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* @param speed Speed to compute the travel time.
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- *
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* @return Time (in seconds) required to travel this path at the given speed (in
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- * kilometers-per-hour).
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- *
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+ * kilometers-per-hour).
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*/
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public double getTravelTime(double speed) {
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float time = 0;
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@@ -246,9 +278,8 @@ public class Path {
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/**
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* Compute the time to travel this path if moving at the maximum allowed speed
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* on every arc.
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- *
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- * @return Minimum travel time to travel this path (in seconds).
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*
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+ * @return Minimum travel time to travel this path (in seconds).
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*/
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public double getMinimumTravelTime() {
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float time = 0;
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