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Updated AndroidX
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M66B
220
app/src/main/java/androidx/room/FtsTableInfo.java
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app/src/main/java/androidx/room/FtsTableInfo.java
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/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.room.util;
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import android.database.Cursor;
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import androidx.annotation.RestrictTo;
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import androidx.annotation.VisibleForTesting;
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import androidx.sqlite.db.SupportSQLiteDatabase;
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import java.util.ArrayDeque;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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/**
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* A data class that holds the information about an FTS table.
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*
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* @hide
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*/
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@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
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public final class FtsTableInfo {
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// A set of valid FTS Options
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private static final String[] FTS_OPTIONS = new String[] {
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"tokenize=", "compress=", "content=", "languageid=", "matchinfo=", "notindexed=",
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"order=", "prefix=", "uncompress="};
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/**
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* The table name
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*/
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public final String name;
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/**
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* The column names
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*/
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public final Set<String> columns;
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/**
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* The set of options. Each value in the set contains the option in the following format:
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* <key>=<value>.
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*/
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public final Set<String> options;
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public FtsTableInfo(String name, Set<String> columns, Set<String> options) {
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this.name = name;
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this.columns = columns;
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this.options = options;
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}
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public FtsTableInfo(String name, Set<String> columns, String createSql) {
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this.name = name;
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this.columns = columns;
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this.options = parseOptions(createSql);
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}
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/**
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* Reads the table information from the given database.
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*
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* @param database The database to read the information from.
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* @param tableName The table name.
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* @return A FtsTableInfo containing the columns and options for the provided table name.
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*/
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public static FtsTableInfo read(SupportSQLiteDatabase database, String tableName) {
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Set<String> columns = readColumns(database, tableName);
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Set<String> options = readOptions(database, tableName);
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return new FtsTableInfo(tableName, columns, options);
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}
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@SuppressWarnings("TryFinallyCanBeTryWithResources")
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private static Set<String> readColumns(SupportSQLiteDatabase database, String tableName) {
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Cursor cursor = database.query("PRAGMA table_info(`" + tableName + "`)");
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Set<String> columns = new HashSet<>();
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try {
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if (cursor.getColumnCount() > 0) {
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int nameIndex = cursor.getColumnIndex("name");
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while (cursor.moveToNext()) {
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columns.add(cursor.getString(nameIndex));
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}
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}
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} finally {
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cursor.close();
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}
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return columns;
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}
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@SuppressWarnings("TryFinallyCanBeTryWithResources")
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private static Set<String> readOptions(SupportSQLiteDatabase database, String tableName) {
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String sql = "";
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Cursor cursor = database.query(
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"SELECT * FROM sqlite_master WHERE `name` = '" + tableName + "'");
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try {
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if (cursor.moveToFirst()) {
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sql = cursor.getString(cursor.getColumnIndexOrThrow("sql"));
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}
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} finally {
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cursor.close();
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}
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return parseOptions(sql);
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}
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/**
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* Parses FTS options from the create statement of an FTS table.
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*
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* This method assumes the given create statement is a valid well-formed SQLite statement as
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* defined in the <a href="https://www.sqlite.org/lang_createvtab.html">CREATE VIRTUAL TABLE
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* syntax diagram</a>.
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*
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* @param createStatement the "CREATE VIRTUAL TABLE" statement.
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* @return the set of FTS option key and values in the create statement.
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*/
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@VisibleForTesting
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@SuppressWarnings("WeakerAccess") /* synthetic access */
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static Set<String> parseOptions(String createStatement) {
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if (createStatement.isEmpty()) {
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return new HashSet<>();
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}
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// Module arguments are within the parenthesis followed by the module name.
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String argsString = createStatement.substring(
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createStatement.indexOf('(') + 1,
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createStatement.lastIndexOf(')'));
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// Split the module argument string by the comma delimiter, keeping track of quotation so
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// so that if the delimiter is found within a string literal we don't substring at the wrong
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// index. SQLite supports four ways of quoting keywords, see:
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// https://www.sqlite.org/lang_keywords.html
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List<String> args = new ArrayList<>();
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ArrayDeque<Character> quoteStack = new ArrayDeque<>();
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int lastDelimiterIndex = -1;
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for (int i = 0; i < argsString.length(); i++) {
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char c = argsString.charAt(i);
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switch (c) {
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case '\'':
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case '"':
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case '`':
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if (quoteStack.isEmpty()) {
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quoteStack.push(c);
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} else if (quoteStack.peek() == c) {
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quoteStack.pop();
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}
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break;
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case '[':
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if (quoteStack.isEmpty()) {
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quoteStack.push(c);
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}
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break;
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case ']':
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if (!quoteStack.isEmpty() && quoteStack.peek() == '[') {
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quoteStack.pop();
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}
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break;
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case ',':
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if (quoteStack.isEmpty()) {
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args.add(argsString.substring(lastDelimiterIndex + 1, i).trim());
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lastDelimiterIndex = i;
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}
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break;
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}
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}
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args.add(argsString.substring(lastDelimiterIndex + 1).trim()); // Add final argument.
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// Match args against valid options, otherwise they are column definitions.
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HashSet<String> options = new HashSet<>();
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for (String arg : args) {
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for (String validOption : FTS_OPTIONS) {
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if (arg.startsWith(validOption)) {
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options.add(arg);
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}
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}
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}
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return options;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (!(o instanceof FtsTableInfo)) return false;
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FtsTableInfo that = (FtsTableInfo) o;
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if (name != null ? !name.equals(that.name) : that.name != null) return false;
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if (columns != null ? !columns.equals(that.columns) : that.columns != null) return false;
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return options != null ? options.equals(that.options) : that.options == null;
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}
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@Override
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public int hashCode() {
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int result = name != null ? name.hashCode() : 0;
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result = 31 * result + (columns != null ? columns.hashCode() : 0);
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result = 31 * result + (options != null ? options.hashCode() : 0);
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return result;
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}
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@Override
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public String toString() {
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return "FtsTableInfo{"
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+ "name='" + name + '\''
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+ ", columns=" + columns
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+ ", options=" + options
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+ '}';
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}
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}
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