third_party/WebKit/Source/core/dom/SpaceSplitString.h

/*
 * Copyright (C) 2007, 2008, 2010, 2011, 2012 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#ifndef SpaceSplitString_h
#define SpaceSplitString_h

#include "wtf/Allocator.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"
#include "wtf/text/AtomicString.h"

namespace blink {

class SpaceSplitString {
  USING_FAST_MALLOC(SpaceSplitString);

 public:
  enum CaseFolding { ShouldNotFoldCase, ShouldFoldCase };
  SpaceSplitString() {}
  SpaceSplitString(const AtomicString& string, CaseFolding caseFolding) {
    set(string, caseFolding);
  }

  bool operator!=(const SpaceSplitString& other) const {
    return m_data != other.m_data;
  }

  void set(const AtomicString&, CaseFolding);
  void clear() { m_data.clear(); }

  bool contains(const AtomicString& string) const {
    return m_data && m_data->contains(string);
  }
  bool containsAll(const SpaceSplitString& names) const {
    return !names.m_data || (m_data && m_data->containsAll(*names.m_data));
  }
  void add(const AtomicString&);
  bool remove(const AtomicString&);

  size_t size() const { return m_data ? m_data->size() : 0; }
  bool isNull() const { return !m_data; }
  const AtomicString& operator[](size_t i) const { return (*m_data)[i]; }

 private:
  class Data : public RefCounted<Data> {
   public:
    static PassRefPtr<Data> create(const AtomicString&);
    static PassRefPtr<Data> createUnique(const Data&);

    ~Data();

    bool contains(const AtomicString& string) {
      size_t size = m_vector.size();
      for (size_t i = 0; i < size; ++i) {
        if (m_vector[i] == string)
          return true;
      }
      return false;
    }

    bool containsAll(Data&);

    void add(const AtomicString&);
    void remove(unsigned index);

    bool isUnique() const { return m_keyString.isNull(); }
    size_t size() const { return m_vector.size(); }
    const AtomicString& operator[](size_t i) { return m_vector[i]; }

   private:
    explicit Data(const AtomicString&);
    explicit Data(const Data&);

    void createVector(const String&);
    template <typename CharacterType>
    inline void createVector(const CharacterType*, unsigned);

    AtomicString m_keyString;
    Vector<AtomicString, 4> m_vector;
  };
  typedef HashMap<AtomicString, Data*> DataMap;

  static DataMap& sharedDataMap();

  void ensureUnique() {
    if (m_data && !m_data->isUnique())
      m_data = Data::createUnique(*m_data);
  }

  RefPtr<Data> m_data;
};

}  // namespace blink

#endif  // SpaceSplitString_h