axmol/cocos/deprecated/CCDictionary.h

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Copyright (c) 2012      cocos2d-x.org
Copyright (c) 2013-2015 Chukong Technologies Inc.

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#ifndef __CCDICTIONARY_H__
#define __CCDICTIONARY_H__
/// @cond DO_NOT_SHOW

#include "base/uthash.h"
#include "base/CCRef.h"
#include "deprecated/CCArray.h"
#include "deprecated/CCString.h"

NS_CC_BEGIN

class __Dictionary;

/**
 * @addtogroup data_structures
 * @{
 */


/**
 *  DictElement is used for traversing Dictionary.
 *
 *  A DictElement is one element of Dictionary, it contains two properties, key and object.
 *  Its key has two different type (integer and string).
 *
 *  @note The key type is unique, all the elements in Dictionary has the same key type(integer or string).
 *  @code
 *  DictElement* pElement;
 *  CCDICT_FOREACH(dict, pElement)
 *  {
 *      const char*key = pElement->getStrKey();
 *      // You certainly know the type of value, so we assume that it's a Sprite.
 *      Sprite* pSprite = static_cast<Sprite*>(pElement->getObject());
 *      // ......
 *  }
 *  @endcode
 *
 */
class CC_DLL DictElement
{
private:
    /**
     *  Constructor of DictElement. It's only for internal usage. Dictionary is its friend class.
     *  
     *  @param  pszKey    The string key of this element.
     *  @param  pObject   The object of this element.
     */
    DictElement(const char* pszKey, Ref* pObject);

    /**
     *  Constructor of DictElement. It's only for internal usage. Dictionary is its friend class.
     *
     *  @param  iKey    The integer key of this element.
     *  @param  pObject   The object of this element.
     */
    DictElement(intptr_t iKey, Ref* pObject);
    
public:
    /**
     *  The destructor of DictElement.
     * @js NA
     * @lua NA
     */
    ~DictElement();

    // Inline functions need to be implemented in header file on Android.
    
    /**
     * Get the string key of this element.
     * @note    This method assumes you know the key type in the element. 
     *          If the element's key type is integer, invoking this method will cause an assert.
     *
     * @return  The string key of this element.
     */
    inline const char* getStrKey() const
    {
        CCASSERT(_strKey[0] != '\0', "Should not call this function for integer dictionary");
        return _strKey;
    }

    /**
     * Get the integer key of this element.
     * @note    This method assumes you know the key type in the element.
     *          If the element's key type is string, invoking this method will cause an assert.
     *
     * @return  The integer key of this element.
     */
    inline intptr_t getIntKey() const
    {
        CCASSERT(_strKey[0] == '\0', "Should not call this function for string dictionary");
        return _intKey;
    }
    
    /**
     * Get the object of this element.
     *
     * @return  The object of this element.
     */
    inline Ref* getObject() const { return _object; }

private:
    // The max length of string key.
    #define   MAX_KEY_LEN   256
    // char array is needed for HASH_ADD_STR in UT_HASH.
    // So it's a pain that all elements will allocate 256 bytes for this array.
    char      _strKey[MAX_KEY_LEN];     // hash key of string type
    intptr_t  _intKey;       // hash key of integer type
    Ref* _object;    // hash value
public:
    UT_hash_handle hh;      // makes this class hashable
    friend class __Dictionary; // declare Dictionary as friend class
};

/** The macro for traversing dictionary
 *  
 *  @note It's faster than getting all keys and traversing keys to get objects by objectForKey.
 *        It's also safe to remove elements while traversing.
 */
#define CCDICT_FOREACH(__dict__, __el__) \
    DictElement* pTmp##__dict__##__el__ = nullptr; \
    if (__dict__) \
    HASH_ITER(hh, (__dict__)->_elements, __el__, pTmp##__dict__##__el__)



/**
 *  Dictionary is a class like NSDictionary in Obj-C .
 *
 *  @note Only the pointer of Object or its subclass can be inserted to Dictionary.
 *  @code
 *  // Create a dictionary, return an autorelease object.
 *  Dictionary* pDict = Dictionary::create();
 *
 *  // Insert objects to dictionary
 *  String* pValue1 = String::create("100");
 *  String* pValue2 = String::create("120");
 *  Integer* pValue3 = Integer::create(200);
 *  pDict->setObject(pValue1, "key1");
 *  pDict->setObject(pValue2, "key2");
 *  pDict->setObject(pValue3, "key3");
 *
 *  // Get the object for key
 *  String* pStr1 = static_cast<String*>(pDict->objectForKey("key1"));
 *  log("{ key1: %s }", pStr1->getCString());
 *  Integer* pInteger = static_cast<Integer*>(pDict->objectForKey("key3"));
 *  log("{ key3: %d }", pInteger->getValue());
 *  @endcode
 *
 */

class CC_DLL __Dictionary : public Ref, public Clonable
{
public:
    /**
     * The constructor of Dictionary.
     * @js NA
     * @lua NA
     */
    __Dictionary();

    /**
     * The destructor of Dictionary
     * @js NA
     * @lua NA
     */
    ~__Dictionary();

    /** Initializes the dictionary. It returns true if the initializations was successful. 
     * @js NA
     * @lua NA
     */
    bool init();
    /**
     *  Get the count of elements in Dictionary.
     *
     *  @return  The count of elements.
     * @js NA
     */
    unsigned int count();

    /**
     *  Return all keys of elements.
     *
     *  @return  The array contains all keys of elements. It's an autorelease object yet.
     * @js NA
     */
    __Array* allKeys();

    /** 
     *  Get all keys according to the specified object.
     *  @warning  We use '==' to compare two objects
     *  @return   The array contains all keys for the specified object. It's an autorelease object yet.
     * @js NA
     */
    __Array* allKeysForObject(Ref* object);

    /**
     *  Get the object according to the specified string key.
     *
     *  @note The dictionary needs to use string as key. If integer is passed, an assert will appear.
     *  @param key  The string key for searching.
     *  @return The object matches the key. You need to force convert it to the type you know.
     *  @code
     *     // Assume that the elements are String* pointers. Convert it by following code.
     *     String* pStr = static_cast<String*>(pDict->objectForKey("key1"));
     *     // Do something about pStr.
     *     // If you don't know the object type, properly you need to use dynamic_cast<SomeType*> to check it.
     *     String* pStr2 = dynamic_cast<String*>(pDict->objectForKey("key1"));
     *     if (pStr2 != NULL) {
     *          // Do something about pStr2
     *     }
     *  @endcode
     *  @see objectForKey(intptr_t)
     * @js NA
     */
    Ref* objectForKey(const std::string& key);
    
    /**
     *  Get the object according to the specified integer key.
     *
     *  @note The dictionary needs to use integer as key. If string is passed, an assert will appear.
     *  @param key  The integer key for searching.
     *  @return The object matches the key.
     *  @see objectForKey(const std::string&)
     * @js NA
     */
    Ref* objectForKey(intptr_t key);
    
    /** Get the value according to the specified string key.
     *
     *  @note Be careful to use this function since it assumes the objects in the dictionary are __String pointer.
     *  @param key  The string key for searching
     *  @return An instance of String.
     *          It will return an empty string if the objects aren't __String pointer or the key wasn't found.
     *  @see valueForKey(intptr_t)
     *  @js NA
     */
    const __String* valueForKey(const std::string& key);
    
    /** Get the value according to the specified integer key.
     *
     *  @note Be careful to use this function since it assumes the objects in the dictionary are __String pointer.
     *  @param key  The string key for searching.
     *  @return An instance of String.
     *          It will return an empty string if the objects aren't __String pointer or the key wasn't found.
     *  @see valueForKey(intptr_t)
     *  @js NA
     */
    const __String* valueForKey(intptr_t key);

    /** Insert an object to dictionary, and match it with the specified string key.
     *
     *  @note When the first time this method is invoked, the key type will be set to string.
     *        After that you can't setObject with an integer key.
     *        If the dictionary contains the key you passed, the object matching the key will be released and removed from dictionary.
     *        Then the new object will be inserted after that.
     *
     *  @param pObject  The Object to be inserted.
     *  @param key      The string key for searching.
     *  @see setObject(Ref*, intptr_t)
     * @js NA
     */
    void setObject(Ref* pObject, const std::string& key);
    
    /** Insert an object to dictionary, and match it with the specified string key.
     *
     *  @note Then the first time this method is invoked, the key type will be set to string.
     *        After that you can't setObject with an integer key.
     *        If the dictionary contains the key you passed, the object matching the key will be released and removed from dictionary.
     *        Then the new object will be inserted after that.
     *  @param pObject  The Object to be inserted.
     *  @param key      The string key for searching.
     *  @see setObject(Ref*, const std::string&)
     *  @js NA
     */
    void setObject(Ref* pObject, intptr_t key);

    /** 
     *  Remove an object by the specified string key.
     *
     *  @param key  The string key for searching.
     *  @see removeObjectForKey(intptr_t), removeObjectsForKeys(__Array*),
     *       removeObjectForElememt(DictElement*), removeAllObjects().
     *  @js NA
     */
    void removeObjectForKey(const std::string& key);
    
    /**
     *  Remove an object by the specified integer key.
     *
     *  @param key  The integer key for searching.
     *  @see removeObjectForKey(const std::string&), removeObjectsForKeys(__Array*),
     *       removeObjectForElememt(DictElement*), removeAllObjects().
     *  @js NA
     */
    void removeObjectForKey(intptr_t key);
    
    /**
     *  Remove objects by an array of keys.
     *
     *  @param pKeyArray  The array contains keys to be removed.
     *  @see removeObjectForKey(const std::string&), removeObjectForKey(intptr_t),
     *       removeObjectForElememt(DictElement*), removeAllObjects().
     *  @js NA
     */
    void removeObjectsForKeys(__Array* pKey__Array);
    
    /**
     *  Remove an object by an element.
     *
     *  @param pElement  The element need to be removed.
     *  @see removeObjectForKey(const std::string&), removeObjectForKey(intptr_t),
     *       removeObjectsForKeys(__Array*), removeAllObjects().
     * @js NA
     * @lua NA
     */
    void removeObjectForElememt(DictElement* pElement);
    
    /**
     *  Remove all objects in the dictionary.
     *
     *  @see removeObjectForKey(const std::string&), removeObjectForKey(intptr_t),
     *       removeObjectsForKeys(__Array*), removeObjectForElememt(DictElement*).
     * @js NA
     */
    void removeAllObjects();
    
    /**
     *  Return a random object in the dictionary.
     *
     *  @return The random object. 
     *  @see objectForKey(intptr_t), objectForKey(const std::string&)
     *  @js NA
     *  @lua NA
     */
    Ref* randomObject();
    
    /**
     *  Create a dictionary.
     *  @return A dictionary which is an autorelease object.
     *  @see createWithDictionary(Dictionary*), createWithContentsOfFile(const char*), createWithContentsOfFileThreadSafe(const char*).
     *  @js NA
     */
    static __Dictionary* create();

    /**
     *  Create a dictionary with an existing dictionary.
     *
     *  @param srcDict The exist dictionary.
     *  @return A dictionary which is an autorelease object.
     *  @see create(), createWithContentsOfFile(const char*), createWithContentsOfFileThreadSafe(const char*).
     *  @js NA
     */
    static __Dictionary* createWithDictionary(__Dictionary* srcDict);
    
    /**
     *  Create a dictionary with a plist file.
     *  @param  pFileName  The name of the plist file.
     *  @return A dictionary which is an autorelease object.
     *  @see create(), createWithDictionary(Dictionary*), createWithContentsOfFileThreadSafe(const char*).
     *  @js NA
     */
    static __Dictionary* createWithContentsOfFile(const char *pFileName);
    
    /**
     *  Write a dictionary to a plist file.
     *  @param fullPath The full path of the plist file. You can get writable path by getWritablePath()
     *  @return true if succeeded, false if failed
     *  @js NA
     *  @lua NA
     */
    bool writeToFile(const char *fullPath);
     
    /**
     *  Create a dictionary with a plist file.
     *  
     *  @note the return object isn't an autorelease object.
     *        This can make sure not using autorelease pool in a new thread.
     *        Therefore, you need to manage the lifecycle of the return object.
     *        It means that when you don't need it, CC_SAFE_RELEASE needs to be invoked.
     *
     *  @param  pFileName  The name of the plist file.
     *  @return A dictionary which isn't an autorelease object.
     *  @js NA
     *  @lua NA
     */
    static __Dictionary* createWithContentsOfFileThreadSafe(const char *pFileName);

    /* override functions 
     *  @js NA
     *  @lua NA
     */
    virtual void acceptVisitor(DataVisitor &visitor);
    /**
     *  @js NA
     *  @lua NA
     */
    virtual __Dictionary* clone() const override;
    
private:
    /** 
     *  For internal usage, invoked by setObject.
     */
    void setObjectUnSafe(Ref* pObject, const std::string& key);
    void setObjectUnSafe(Ref* pObject, const intptr_t key);
    
public:
    /**
     *  All the elements in dictionary.
     * 
     *  @note For internal usage, we need to declare this member variable as public since it's used in UT_HASH.
     */
    DictElement* _elements;
private:
    
    /** The support type of dictionary, it's confirmed when setObject is invoked. */
    enum DictType
    {
        kDictUnknown = 0,
        kDictStr,
        kDictInt
    };
    
    /** 
     *  The type of dictionary, it's assigned to kDictUnknown by default.
     */
    DictType _dictType;
};

// end of data_structure group
/// @}

NS_CC_END

/// @endcond
#endif /* __CCDICTIONARY_H__ */