axmol/cocos/base/CCDataVisitor.h

/****************************************************************************
 Copyright (c) 2013-2014 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
 in the Software without restriction, including without limitation the rights
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 THE SOFTWARE.
 ****************************************************************************/

#ifndef __CCDATAVISITOR_H__
#define __CCDATAVISITOR_H__

#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;

/**
 * @cond
 */

/**
 * 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

#endif // __CCDATAVISITOR_H__