MD5交并集

package example.data;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

public class TFKTest {

    public static void main(String[] args) {
        TFKTest test = new TFKTest();
        test.test();
    }

    /**
     * 计算两个集合交集
     */
    public void test() {

        Node root = new Node();

        // 初始化两条目标数据
        Path data = Path.sentenceToPath("b71b060decc045e09769044784588755");
        NodeOperate.addNode(root, data);

        data = Path.sentenceToPath("bacbe8961a0145bb87c9c8ab5f494123");
        NodeOperate.addNode(root, data);

        // 初始化第一颗树
        for (int i = 0; i < 5; i++) {
            String sentence = makeCharacter();
            Path path = Path.sentenceToPath(sentence);
            NodeOperate.addNode(root, path);
        }

        // 第二树中的一个节点
        String sentence = "bacbe8961a0145bb87c9c8ab5f494123";
        Path target = Path.sentenceToPath(sentence);

        // 交集结果存储在temp中
        Node temp = new Node();

        // 进行或者运行
        andComputer(root, temp, target);

        System.err.println("test");
    }

    public String makeCharacter() {
        String uuid = UUID.randomUUID().toString().replace("-", "");
        System.err.println(uuid);
        return uuid;
    }

    public void andComputer(Node root, Node temp, Path path) {
        if (NodeOperate.existsNode(root, path)) {
            System.err.println(Path.pathToSentence(path) + ":exists");
            NodeOperate.addNode(temp, path);
        }
    }

    public void orCOmputer(Node root, Path path) {

    }
}

class Node {
    char key;
    Node value;
    Map<Character, Node> pair;
}

class NodeOperate {

    public static void addNode(Node node, Path path) {

        if (node == null || path == null) {
            return;
        }

        if (contains(node, path)) {

            Node next = findNode(node, path);
            if (next != null) {
                updateNode(node);
                addNode(next, path.next);
            }
        } else {
            Node next = new Node();

            saveNode(node, path, next);

            addNode(next, path.next);
        }
    }

    public static void addNode0(Node node, Path path) {

        if (node == null || path == null) {
            return;
        }

        if (contains(node, path)) {
            Node next = findNode(node, path);
            addNode(next, path.next);
        } else {
            Node next = new Node();

            if (node.key != '\u0000') {
                updateNode(node);
            }
            saveNode(node, path, next);

            addNode(next, path.next);
        }
    }

    public static Node findNode(Node node, Path path) {
        if (node.key != '\u0000') {
            if (node.key == (path.word)) {
                return node.value;
            }
        }

        return node.pair.get(path.word);
    }

    public static boolean existsNode(Node node, Path path) {

        Path it = path;
        Node next = node;
        int i = 0;
        do {
            next = findNode(next, it);
            if (next != null) {
                it = it.next;
                i++;
            } else {
                return false;
            }
        } while (it != null);

        return i == 32;
    }

    public static void saveNode(Node node, Path path, Node next) {
        if (node.pair != null) {
            node.pair.put(path.word, next);
        } else {
            node.key = path.word;
            node.value = next;
        }
    }

    public static void updateNode(Node node) {
        if (node.pair == null) {
            node.pair = new HashMap<>();
        }

        node.pair.put(node.key, node.value);

        node.key = '\u0000';
        node.value = null;
    }

    public static boolean contains(Node node, Path path) {

        if (node.pair != null) {
            return node.pair.containsKey(path.word);
        }

        if (node.key != '\u0000') {
            return node.key == (path.word);
        }
        return false;
    }
}

/**
 * Linked list representation of Pattern Path and Input Path
 */
class Path extends ArrayList<String> {

    private static final long serialVersionUID = 1L;

    public char word;
    public Path next;
    public int length;

    /**
     * Constructor - class has public members
     */
    private Path() {
        next = null;
        word = '\u0000';
        length = 0;
    }

    /**
     * convert a sentence (a string consisting of words separated by single spaces)
     * into a Path
     *
     * @param sentence
     *            sentence to convert
     * @return sentence in Path form
     */
    public static Path sentenceToPath(String sentence) {
        sentence = sentence.trim();
        return arrayToPath(sentence.toCharArray());
    }

    /**
     * The inverse of sentenceToPath
     *
     * @param path
     *            input path
     * @return sentence
     */
    public static String pathToSentence(Path path) {
        StringBuilder result = new StringBuilder(32);
        for (Path p = path; p != null; p = p.next) {
            result.append(p.word);
        }
        return result.toString();
        /*
         * if (path == null) return ""; else return
         * path.word+" "+pathToSentence(path.next);
         */
    }

    /**
     * convert an array of strings to a Path
     *
     * @param array
     *            array of strings
     * @return sequence of strings as Path
     */
    private static Path arrayToPath(char[] array) {
        Path tail = null;
        Path head = null;
        for (int i = array.length - 1; i >= 0; i--) {
            head = new Path();
            head.word = array[i];
            head.next = tail;
            if (tail == null)
                head.length = 1;
            else
                head.length = tail.length + 1;
            tail = head;
        }
        return head;
        // return arrayToPath(array, 0);
    }

    /**
     * recursively convert an array to a Path
     *
     * @param array
     *            array of strings
     * @param index
     *            array index
     * @return Path form
     */
    static Path arrayToPath(char[] array, int index) {
        if (index >= array.length)
            return null;
        else {
            Path newPath = new Path();
            newPath.word = array[index];
            newPath.next = arrayToPath(array, index + 1);
            if (newPath.next == null)
                newPath.length = 1;
            else
                newPath.length = newPath.next.length + 1;
            return newPath;
        }
    }

    /**
     * print a Path
     */
    public String print() {
        String result = "";
        for (Path p = this; p != null; p = p.next) {
            result += p.word + ",";
        }
        if (result.endsWith(","))
            result = result.substring(0, result.length() - 1);

        return result;
    }

    @Override
    public String toString() {
        return this.print();
    }

}