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317
src/org/nyanya/android/traditionalt9/T9DB.java
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317
src/org/nyanya/android/traditionalt9/T9DB.java
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package org.nyanya.android.traditionalt9;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.Locale;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.res.Resources;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteConstraintException;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.provider.BaseColumns;
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import android.util.Log;
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public class T9DB {
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protected static final String DATABASE_NAME = "t9dict.db";
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protected static final int DATABASE_VERSION = 1;
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protected static final String WORD_TABLE_NAME = "word";
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protected static final String FREQ_TRIGGER_NAME = "freqtrigger";
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//50k, 10k
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private static final int FREQ_MAX = 50000;
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private static final int FREQ_DIV = 10000;
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protected static final String COLUMN_ID = BaseColumns._ID;
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protected static final String COLUMN_SEQ = "seq";
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protected static final String COLUMN_WORD = "word";
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protected static final String COLUMN_FREQUENCY = "freq";
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private static final int MAX_RESULTS = 8;
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private static final int CAPS_OFF = 0;
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private static final int CAPS_SINGLE = 1;
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private static final int CAPS_ALL = 2;
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private DatabaseHelper mOpenHelper;
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private SQLiteDatabase db;
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private Context parent;
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public T9DB(Context caller) {
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//create db
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parent = caller;
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mOpenHelper = new DatabaseHelper(caller);
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}
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public static SQLiteDatabase getSQLDB(Context caller) {
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return new DatabaseHelper(caller).getWritableDatabase();
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}
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public void init() {
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db = mOpenHelper.getWritableDatabase();
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//mOpenHelper.onUpgrade(db, 0, DATABASE_VERSION);
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}
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public void close() {
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db.close();
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}
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public void nuke() {
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init();
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mOpenHelper.onUpgrade(db, 0, DATABASE_VERSION);
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db.close();
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db = null;
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}
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public void addWord(String iword) throws DBException {
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Resources r = parent.getResources();
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if (iword.equals("")) {
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throw new DBException(r.getString(R.string.add_word_blank));
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}
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//get int sequence
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String seq = CharMap.getStringSequence(iword);
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//add int sequence into num table
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ContentValues values = new ContentValues();
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values.put(COLUMN_SEQ, seq);
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//add word into word
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values.put(COLUMN_WORD, iword);
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values.put(COLUMN_FREQUENCY, 1);
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try {
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db.insertOrThrow(WORD_TABLE_NAME, null, values);
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} catch (SQLiteConstraintException e) {
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String msg = r.getString(R.string.add_word_exist1) + iword + r.getString(R.string.add_word_exist2);
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Log.w("T9DB.addWord", msg);
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throw new DBException(msg);
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}
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}
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public void incrementWord(int id) {
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db.execSQL("UPDATE " + WORD_TABLE_NAME + " SET " + COLUMN_FREQUENCY + " = " +
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COLUMN_FREQUENCY + "+ 1 WHERE " + COLUMN_ID + " = \"" + id + "\"");
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// if id's freq is greater than X we should normalise those with the same seq
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}
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public void updateWords(String is, ArrayList<String> stringList, ArrayList<Integer> intList, int capsMode){
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stringList.clear();
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intList.clear();
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//String[] sa = packInts(stringToInts(is), true);
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int islen = is.length();
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String q = "SELECT " + COLUMN_ID + ", " + COLUMN_WORD +
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" FROM " + WORD_TABLE_NAME +
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" WHERE " + COLUMN_SEQ + "=?" +
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" ORDER BY " + COLUMN_FREQUENCY + " DESC";
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Cursor cur = db.rawQuery(q, new String[] {is});
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int hits = 0;
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for(cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
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intList.add(cur.getInt(0));
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stringList.add(cur.getString(1));
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if (hits >= 15) {
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break;
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}
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hits++;
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}
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cur.close();
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if (hits < 4) {
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char c = is.charAt(islen-1);
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c++;
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// q = "SELECT " + COLUMN_WORD +", " + COLUMN_FREQUENCY +
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// " FROM " + WORD_TABLE_NAME +
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// " WHERE " + COLUMN_SEQ + " LIKE ?" +
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// " ORDER BY " + COLUMN_SEQ + " ASC, " + COLUMN_FREQUENCY + " DESC;";
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// c = db.rawQuery(q, new String[] {is + "_%"});
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//above is hella slow below is gotta query fast
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q = "SELECT " + COLUMN_ID + ", " + COLUMN_WORD +
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" FROM " + WORD_TABLE_NAME +
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" WHERE " + COLUMN_SEQ + " >= '" + is + "1" + "' AND " + COLUMN_SEQ + " < '" + is.substring(0, islen-1) + c + "'" +
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" ORDER BY " + COLUMN_FREQUENCY + " DESC, " + COLUMN_SEQ + " ASC" +
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" LIMIT " + (MAX_RESULTS - hits);
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cur = db.rawQuery(q, null);
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for(cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
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intList.add(cur.getInt(0));
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stringList.add(cur.getString(1));
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if (hits >= 10) {
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break;
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}
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hits++;
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}
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cur.close();
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}
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//Log.d("T9DB.updateWords", "pre: " + stringList);
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if (capsMode == CAPS_OFF) {
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return;
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}
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//Log.d("T9DB.updateWords", "filtering...");
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// filter list
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Iterator<String> iter = stringList.iterator();
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String word;
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String wordtemp;
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int index = 0;
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boolean removed = false;
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while (iter.hasNext()) {
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word = iter.next();
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switch (capsMode) {
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case CAPS_ALL:
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wordtemp = word.toUpperCase(Locale.US);
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if (wordtemp.equals(word)) {
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index++;
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continue;
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} else if (stringList.contains(wordtemp)){
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//remove this entry
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iter.remove();
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removed = true;
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} else {
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stringList.set(index, wordtemp);
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}
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break;
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case CAPS_SINGLE:
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if (word.length() > 1) {
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wordtemp = word.substring(0, 1).toUpperCase(Locale.US) + word.substring(1);
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} else {
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wordtemp = word.toUpperCase(Locale.US);
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}
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if (wordtemp.equals(word)) {
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index++;
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continue;
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} else if (stringList.contains(wordtemp)){
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//remove this entry
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iter.remove();
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removed = true;
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} else {
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stringList.set(index, wordtemp);
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}
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break;
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}
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if (removed) {
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intList.remove(index);
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removed = false;
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} else {
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index++;
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}
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}
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return;
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}
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protected void updateWordsW(String is, ArrayList<String> stringList, ArrayList<Integer> intList,
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ArrayList<Integer> freq){
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stringList.clear();
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intList.clear();
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freq.clear();
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//String[] sa = packInts(stringToInts(is), true);
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int islen = is.length();
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String q = "SELECT " + COLUMN_ID + ", " + COLUMN_WORD + ", " + COLUMN_FREQUENCY +
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" FROM " + WORD_TABLE_NAME +
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" WHERE " + COLUMN_SEQ + "=?" +
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" ORDER BY " + COLUMN_FREQUENCY + " DESC";
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Cursor cur = db.rawQuery(q, new String[] {is});
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int hits = 0;
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for(cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
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intList.add(cur.getInt(0));
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stringList.add(cur.getString(1));
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freq.add(cur.getInt(2));
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if (hits >= 10) {
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break;
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}
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hits++;
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}
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cur.close();
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if (hits < 4) {
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char c = is.charAt(islen-1);
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c++;
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// q = "SELECT " + COLUMN_WORD +", " + COLUMN_FREQUENCY +
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// " FROM " + WORD_TABLE_NAME +
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// " WHERE " + COLUMN_SEQ + " LIKE ?" +
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// " ORDER BY " + COLUMN_SEQ + " ASC, " + COLUMN_FREQUENCY + " DESC;";
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// c = db.rawQuery(q, new String[] {is + "_%"});
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//above is hella slow
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q = "SELECT " + COLUMN_ID + ", " + COLUMN_WORD + ", " + COLUMN_FREQUENCY +
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" FROM " + WORD_TABLE_NAME +
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" WHERE " + COLUMN_SEQ + " >= '" + is + "' AND " + COLUMN_SEQ + " < '" + is.substring(0, islen-1) + c + "'" +
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" ORDER BY " + COLUMN_FREQUENCY + " DESC, " + COLUMN_SEQ + " ASC" +
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" LIMIT " + (MAX_RESULTS - hits);
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cur = db.rawQuery(q, null);
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for(cur.moveToFirst(); !cur.isAfterLast(); cur.moveToNext()) {
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intList.add(cur.getInt(0));
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stringList.add(cur.getString(1));
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freq.add(cur.getInt(2));
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if (hits >= 10) {
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break;
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}
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hits++;
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}
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cur.close();
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}
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return;
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}
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protected static int[] stringToInts(String s){
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int[] il = new int[s.length()];
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for (int x = 0; x < s.length(); x++){
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il[x] = s.charAt(x) - 48; //lol hope this is ASCII all the time
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}
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return il;
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}
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protected static String[] packInts(int[] intseq, boolean stringArray){
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int[] ia = packInts(intseq);
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String[] sa = {Integer.toString(ia[0]), Integer.toString(ia[1])};
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return sa;
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}
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protected static int[] packInts(int[] intseq){
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int[] ia = {0, 0};
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for (int x = 0; x < intseq.length; x++){
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if (x < 8){
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//packing 8 ints (<10) into 32bit int ... I hope...
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ia[0] = ia[0] | (intseq[x] << x*4);
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} else {
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ia[1] = intseq[x] << (x % 8) * 4;
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}
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}
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return ia;
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}
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private static class DatabaseHelper extends SQLiteOpenHelper {
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DatabaseHelper(Context context) {
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super(context, DATABASE_NAME, null, DATABASE_VERSION);
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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db.execSQL("CREATE TABLE " + WORD_TABLE_NAME + " ("
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+ COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
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+ COLUMN_SEQ + " TEXT, "
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+ COLUMN_WORD + " TEXT UNIQUE, "
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+ COLUMN_FREQUENCY + " INTEGER"
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+ ")");
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db.execSQL("CREATE INDEX idx ON " + WORD_TABLE_NAME + "("
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//+ COLUMN_NUMHIGH + ", " + COLUMN_NUMLOW + ")");
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+ COLUMN_SEQ + " ASC, " + COLUMN_FREQUENCY + " DESC )");
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db.execSQL("CREATE TRIGGER " + FREQ_TRIGGER_NAME + " AFTER UPDATE ON " + WORD_TABLE_NAME
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+ " WHEN NEW." + COLUMN_FREQUENCY + " > " + FREQ_MAX
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+ " BEGIN"
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+ " UPDATE " + WORD_TABLE_NAME + " SET " + COLUMN_FREQUENCY
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+ " = " + COLUMN_FREQUENCY + " / " + FREQ_DIV + " WHERE " + COLUMN_SEQ + " = NEW." + COLUMN_SEQ + ";"
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+ " END;");
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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Log.w("T9DB", "Upgrading database from version " + oldVersion + " to "
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+ newVersion + ", which will destroy all old data");
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db.execSQL("DROP TABLE IF EXISTS " + WORD_TABLE_NAME);
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db.execSQL("DROP INDEX IF EXISTS idx");
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onCreate(db);
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Log.w("T9DB", "Done.");
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}
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}
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}
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