axmol/cocos/base/CCDataVisitor.h

/****************************************************************************
 Copyright (c) 2013-2015 Chukong Technologies Inc.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 ****************************************************************************/

#ifndef __CCDATAVISITOR_H__
#define __CCDATAVISITOR_H__
/// @cond DO_NOT_SHOW

#include "platform/CCPlatformMacros.h"
#include <string>

NS_CC_BEGIN

class Ref;
class __Bool;
class __Integer;
class __Float;
class __Double;
class __String;
class __Array;
class __Dictionary;
class __Set;

/**
 * Visitor that helps to perform action that depends on polymorphic object type
 *
 * Use cases:
 *  - data serialization,
 *  - pretty printing of Ref* 
 *  - safe value reading from Array, __Dictionary, Set
 *
 * Usage:
 *  1. subclass DataVisitor
 *  2. overload visit() methods for object that you need to handle
 *  3. handle other objects in visitObject()
 *  4. pass your visitor to Object::acceptVisitor()
 */
class CC_DLL DataVisitor
{
public:
    /**
     * @js NA
     * @lua NA
     */
    virtual ~DataVisitor() {}

    /** default method, called from non-overloaded methods and for unrecognized objects */
    virtual void visitObject(const Ref *p) = 0;

    virtual void visit(const __Bool *p);
    virtual void visit(const __Integer *p);
    virtual void visit(const __Float *p);
    virtual void visit(const __Double *p);
    virtual void visit(const __String *p);
    virtual void visit(const __Array *p);
    virtual void visit(const __Dictionary *p);
    virtual void visit(const __Set *p);
};


class CC_DLL PrettyPrinter : public DataVisitor
{
public:
    PrettyPrinter(int indentLevel = 0);
    
    virtual void clear();
    virtual std::string getResult();
    
    virtual void visitObject(const Ref *p);
    virtual void visit(const __Bool * p);
    virtual void visit(const __Integer *p);
    virtual void visit(const __Float *p);
    virtual void visit(const __Double *p);
    virtual void visit(const __String *p);
    virtual void visit(const __Array *p);
    virtual void visit(const __Dictionary *p);
    virtual void visit(const __Set *p);
private:
    void setIndentLevel(int indentLevel);
    int _indentLevel;
    std::string _indentStr;
    std::string _result;
};

/**
 * @endcond
 */

NS_CC_END

/// @endcond
#endif // __CCDATAVISITOR_H__