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/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.plugins.javascript.eslint.cache;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;

class StringTable {

  private final Map table;
  private final List byIndex;

  StringTable() {
    table = new HashMap<>();
    byIndex = new ArrayList<>();
  }

  StringTable(List byIndex) {
    table = new HashMap<>();
    this.byIndex = byIndex;
    for (int i = 0; i < byIndex.size(); i++) {
      table.put(byIndex.get(i), i);
    }
  }

  int getIndex(@Nullable String string) {
    return table.computeIfAbsent(
      string,
      s -> {
        byIndex.add(s);
        return byIndex.size() - 1;
      }
    );
  }

  String getString(int index) {
    return byIndex.get(index);
  }

  List getStringList() {
    return Collections.unmodifiableList(byIndex);
  }
}