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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      3  * Copyright (C) 2010, 2011, 2012 Google Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef FormController_h
     23 #define FormController_h
     24 
     25 #include "core/html/forms/CheckedRadioButtons.h"
     26 #include "wtf/Forward.h"
     27 #include "wtf/ListHashSet.h"
     28 #include "wtf/Vector.h"
     29 #include "wtf/text/AtomicStringHash.h"
     30 
     31 namespace WebCore {
     32 
     33 class FormAssociatedElement;
     34 class FormKeyGenerator;
     35 class HTMLFormControlElementWithState;
     36 class HTMLFormElement;
     37 class SavedFormState;
     38 
     39 class FormControlState {
     40 public:
     41     FormControlState() : m_type(TypeSkip) { }
     42     explicit FormControlState(const String& value) : m_type(TypeRestore) { m_values.append(value); }
     43     static FormControlState deserialize(const Vector<String>& stateVector, size_t& index);
     44     FormControlState(const FormControlState& another) : m_type(another.m_type), m_values(another.m_values) { }
     45     FormControlState& operator=(const FormControlState&);
     46 
     47     bool isFailure() const { return m_type == TypeFailure; }
     48     size_t valueSize() const { return m_values.size(); }
     49     const String& operator[](size_t i) const { return m_values[i]; }
     50     void append(const String&);
     51     void serializeTo(Vector<String>& stateVector) const;
     52 
     53 private:
     54     enum Type { TypeSkip, TypeRestore, TypeFailure };
     55     explicit FormControlState(Type type) : m_type(type) { }
     56 
     57     Type m_type;
     58     Vector<String> m_values;
     59 };
     60 
     61 inline FormControlState& FormControlState::operator=(const FormControlState& another)
     62 {
     63     m_type = another.m_type;
     64     m_values = another.m_values;
     65     return *this;
     66 }
     67 
     68 inline void FormControlState::append(const String& value)
     69 {
     70     m_type = TypeRestore;
     71     m_values.append(value);
     72 }
     73 
     74 class FormController {
     75     WTF_MAKE_FAST_ALLOCATED;
     76 public:
     77     static PassOwnPtr<FormController> create()
     78     {
     79         return adoptPtr(new FormController);
     80     }
     81     ~FormController();
     82 
     83     CheckedRadioButtons& checkedRadioButtons() { return m_checkedRadioButtons; }
     84 
     85     void registerFormElementWithState(HTMLFormControlElementWithState*);
     86     void unregisterFormElementWithState(HTMLFormControlElementWithState*);
     87     // This should be callled only by Document::formElementsState().
     88     Vector<String> formElementsState() const;
     89     // This should be callled only by Document::setStateForNewFormElements().
     90     void setStateForNewFormElements(const Vector<String>&);
     91     void willDeleteForm(HTMLFormElement*);
     92     void restoreControlStateFor(HTMLFormControlElementWithState&);
     93     void restoreControlStateIn(HTMLFormElement&);
     94 
     95     static Vector<String> getReferencedFilePaths(const Vector<String>& stateVector);
     96 
     97 private:
     98     typedef ListHashSet<RefPtr<HTMLFormControlElementWithState>, 64> FormElementListHashSet;
     99     typedef HashMap<AtomicString, OwnPtr<SavedFormState> > SavedFormStateMap;
    100 
    101     FormController();
    102     static PassOwnPtr<SavedFormStateMap> createSavedFormStateMap(const FormElementListHashSet&);
    103     FormControlState takeStateForFormElement(const HTMLFormControlElementWithState&);
    104     static void formStatesFromStateVector(const Vector<String>&, SavedFormStateMap&);
    105 
    106     CheckedRadioButtons m_checkedRadioButtons;
    107     FormElementListHashSet m_formElementsWithState;
    108     SavedFormStateMap m_savedFormStateMap;
    109     OwnPtr<FormKeyGenerator> m_formKeyGenerator;
    110 };
    111 
    112 } // namespace WebCore
    113 #endif
    114