/**
* <<<<<<< HEAD topk ��½ҳ ======= topk 着陆页 >>>>>>> seuvislogwws/master
*
* @param topK
* @return
*/
public List<URLNode> topKLandPage(int topK) {
List<URLNode> mainland_nodes = new ArrayList<URLNode>();
List<? extends Node> nodes = this.getNodes();
for (Node node : nodes) {
URLNode n = (URLNode) node;
if (n.getDepth() == 0) {
// System.out.println(n.getIn_degree());
for (URLNode no : mainland_nodes) {
// System.out.print(no.getIn_degree()+" ");
}
if (mainland_nodes.size() < topK) {
mainland_nodes.add(n);
} else {
URLNode minnode = getMinNode(mainland_nodes, "in_degree");
// System.out.print("[" + minnode.getIn_degree() + "]");
if (minnode.getIn_degree() < n.getIn_degree()) {
mainland_nodes.remove(minnode);
mainland_nodes.add(n);
}
}
// System.out.println();
}
}
return mainland_nodes;
}
/**
* <<<<<<< HEAD �õ�nodes��List��indegree����λ�� ======= 得到nodes的List的indegree的中位数 >>>>>>>
* seuvislogwws/master
*/
public double getMiddle(List<? extends Node> nodes) {
double[] indegree = new double[nodes.size()];
int i = 0;
for (Node node : nodes) {
URLNode n = (URLNode) node;
indegree[i] = n.getIn_degree();
i++;
}
double middle = quickSelect(indegree, 0, indegree.length - 1, indegree.length / 2);
return middle;
}
/**
* <<<<<<< HEAD ȡ��nodes��ij��ָ����С��node ======= 取得nodes中某个指标最小的node >>>>>>> seuvislogwws/master
*
* @param nodes
* @param param
* @return
*/
public URLNode getMinNode(List<URLNode> nodes, String param) {
URLNode node = nodes.get(0);
for (int i = 1; i < nodes.size(); i++) {
double quota1 = 0;
double quota2 = 0;
if (param.equals("in_degree")) {
quota1 = node.getIn_degree();
quota2 = nodes.get(i).getIn_degree();
}
if (param.equals("drop_percent")) {
quota1 = node.getDrop_per();
quota2 = nodes.get(i).getDrop_per();
}
if (quota1 > quota2) node = nodes.get(i);
}
return node;
}
/** <<<<<<< HEAD topK ���ҳ ======= topK 跳出页 >>>>>>> seuvislogwws/master */
public List<URLNode> topKDropPage(int k) {
List<URLNode> highdrop_nodes = new ArrayList<URLNode>();
List<? extends Node> nodes = this.getNodes();
// ���ҵ����нڵ��indegree����λ��
double middle = getMiddle(nodes);
for (Node node : nodes) {
URLNode n = (URLNode) node;
if (n.getIn_degree() > middle) {
if (highdrop_nodes.size() < k) {
highdrop_nodes.add(n);
} else {
URLNode minNode = getMinNode(highdrop_nodes, "drop_percent");
if (minNode.getDrop_per() < n.getDrop_per()) {
highdrop_nodes.remove(minNode);
highdrop_nodes.add(n);
}
}
}
}
return highdrop_nodes;
}
