Add SQLWhereIn and LevenshteinDistance algorithm
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package fr.pandacube.util;
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import java.util.Objects;
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import java.util.function.ToIntBiFunction;
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public class LevenshteinDistance {
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private String initialList;
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private int elementAdditionScore;
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private int elementDeletionScore;
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private ToIntBiFunction<Character, Character> elementDistanceFunction;
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private int[] prev, curr;
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private int progress = 0;
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public LevenshteinDistance(String initList, String finList, int addScore, int delScore, ToIntBiFunction<Character, Character> elemDistFn) {
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initialList = initList == null ? "" : initList;
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elementAdditionScore = addScore;
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elementDeletionScore = delScore;
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elementDistanceFunction = elemDistFn == null ? ((e1, e2) -> Objects.equals(e1, e2) ? 0 : 1) : elemDistFn;
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prev = new int[initialList.length() + 1];
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curr = new int[initialList.length() + 1];
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for (int i = 0; i < curr.length; i++)
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curr[i] = i * elementDeletionScore;
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add(finList);
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}
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public LevenshteinDistance() {
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this(null, null, 1, 1, null);
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}
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public LevenshteinDistance(String initList) {
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this(initList, null, 1, 1, null);
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}
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public int getCurrentDistance() {
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return curr[curr.length - 1];
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}
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public void add(String els) {
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for (char el : els.toCharArray())
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add(el);
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}
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public void add(char el) {
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progress++;
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// swap score arrays
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int[] tmp = prev; prev = curr; curr = tmp;
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curr[0] = progress * elementAdditionScore;
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for (int i = 1; i < curr.length; i++) {
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int S = prev[i - 1] + elementDistanceFunction.applyAsInt(initialList.charAt(i - 1), el);
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int A = prev[i] + elementAdditionScore;
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int D = curr[i - 1] + elementDeletionScore;
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curr[i] = Math.min(S, Math.min(A, D));
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}
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}
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}
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@ -1,145 +0,0 @@
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package fr.pandacube.util;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.UUID;
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import com.google.gson.Gson;
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import com.google.gson.annotations.SerializedName;
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/**
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* This class performs a name lookup for a player and gets back all the name
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* changes of the player (if any).
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* <br/>
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* <a href="https://bukkit.org/threads/player-name-history-lookup.412679/">https
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* ://bukkit.org/threads/player-name-history-lookup.412679/</a>
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*
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* @since 25-3-2016
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* @author mine-care (AKA fillpant)
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*
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*/
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public class PlayerNameHistoryLookup {
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/**
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* The URL from Mojang API that provides the JSON String in response.
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*/
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private static final String LOOKUP_URL = "https://api.mojang.com/user/profiles/%s/names";
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private static final Gson JSON_PARSER = new Gson();
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/**
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* <h1>NOTE: Avoid running this method <i>Synchronously</i> with the main
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* thread!It blocks while attempting to get a response from Mojang servers!
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* </h1>
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*
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* @param player The UUID of the player to be looked up.
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* @return Returns an array of {@link PreviousPlayerNameEntry} objects, or
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* null if the response couldn't be interpreted.
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* @throws IOException {@link #getPlayerPreviousNames(String)}
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*/
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public static PreviousPlayerNameEntry[] getPlayerPreviousNames(UUID player) throws IOException {
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return getPlayerPreviousNames(player.toString());
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}
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/**
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* <h1>NOTE: Avoid running this method <i>Synchronously</i> with the main
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* thread! It blocks while attempting to get a response from Mojang servers!
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* </h1>
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* Alternative method accepting an {@link OfflinePlayer} (and therefore
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* {@link Player}) objects as parameter.
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*
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* @param uuid The UUID String to lookup
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* @return Returns an array of {@link PreviousPlayerNameEntry} objects, or
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* null if the response couldn't be interpreted.
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* @throws IOException {@link #getRawJsonResponse(String)}
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*/
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public static PreviousPlayerNameEntry[] getPlayerPreviousNames(String uuid) throws IOException {
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if (uuid == null || uuid.isEmpty()) return null;
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uuid = uuid.replace("-", "");
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String response = getRawJsonResponse(new URL(String.format(LOOKUP_URL, uuid)));
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PreviousPlayerNameEntry[] names = JSON_PARSER.fromJson(response, PreviousPlayerNameEntry[].class);
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return names;
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}
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/**
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* This is a helper method used to read the response of Mojang's API
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* webservers.
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*
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* @param u the URL to connect to
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* @return a String with the data read.
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* @throws IOException Inherited by {@link BufferedReader#readLine()},
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* {@link BufferedReader#close()}, {@link URL},
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* {@link HttpURLConnection#getInputStream()}
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*/
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private static String getRawJsonResponse(URL u) throws IOException {
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HttpURLConnection con = (HttpURLConnection) u.openConnection();
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con.setDoInput(true);
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con.setConnectTimeout(2000);
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con.setReadTimeout(2000);
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con.connect();
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BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
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String response = in.readLine();
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in.close();
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return response;
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}
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/**
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* This class represents the typical response expected by Mojang servers
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* when requesting the name history of a player.
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*/
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public class PreviousPlayerNameEntry {
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private String name;
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@SerializedName("changedToAt")
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private long changeTime;
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/**
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* Gets the player name of this entry.
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*
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* @return The name of the player.
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*/
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public String getPlayerName() {
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return name;
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}
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/**
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* Get the time of change of the name.
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* <br>
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* <b>Note: This will return 0 if the name is the original (initial)
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* name of the player! Make sure you check if it is 0 before handling!
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* <br>
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* Parsing 0 to a Date will result in the date "01/01/1970".</b>
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*
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* @return a timestamp in miliseconds that you can turn into a date or
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* handle however you want :)
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*/
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public long getChangeTime() {
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return changeTime;
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}
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/**
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* Check if this name is the name used to register the account (the
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* initial/original name)
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*
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* @return a boolean, true if it is the the very first name of the
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* player, otherwise false.
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*/
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public boolean isPlayersInitialName() {
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return getChangeTime() == 0;
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}
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@Override
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public String toString() {
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return "Name: " + name + " Date of change: " + new Date(changeTime).toString();
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}
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}
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public static void main(String[] args) throws IOException {
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System.out.println(Arrays.toString(getPlayerPreviousNames("a18d9b2c-e18f-4933-9e15-36452bc36857")));
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}
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}
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@ -0,0 +1,34 @@
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package fr.pandacube.util.orm;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import org.javatuples.Pair;
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public class SQLWhereIn extends SQLWhere {
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private SQLField<?, ?> field;
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private Collection<?> values;
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public <T> SQLWhereIn(SQLField<?, T> f, Collection<T> v) {
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if (f == null || v == null)
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throw new IllegalArgumentException("All arguments for SQLWhereIn constructor can't be null");
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field = f;
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values = v;
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}
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@Override
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public Pair<String, List<Object>> toSQL() throws ORMException {
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List<Object> params = new ArrayList<>();
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for (Object v : values)
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SQLElement.addValueToSQLObjectList(params, field, v);
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char[] questions = new char[values.size() == 0 ? 0 : (values.size() * 2 - 1)];
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for (int i = 0; i < questions.length; i++)
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questions[i] = i % 2 == 0 ? '?' : ',';
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return new Pair<>("`" + field.getName() + "` IN (" + new String(questions) + ") ", params);
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}
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}
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