JUCE/modules/juce_core/containers/juce_DynamicObject.h

/*
  ==============================================================================

   This file is part of the juce_core module of the JUCE library.
   Copyright (c) 2013 - Raw Material Software Ltd.

   Permission to use, copy, modify, and/or distribute this software for any purpose with
   or without fee is hereby granted, provided that the above copyright notice and this
   permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
   NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
   IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ------------------------------------------------------------------------------

   NOTE! This permissive ISC license applies ONLY to files within the juce_core module!
   All other JUCE modules are covered by a dual GPL/commercial license, so if you are
   using any other modules, be sure to check that you also comply with their license.

   For more details, visit www.juce.com

  ==============================================================================
*/

#ifndef JUCE_DYNAMICOBJECT_H_INCLUDED
#define JUCE_DYNAMICOBJECT_H_INCLUDED


//==============================================================================
/**
    Represents a dynamically implemented object.

    This class is primarily intended for wrapping scripting language objects,
    but could be used for other purposes.

    An instance of a DynamicObject can be used to store named properties, and
    by subclassing hasMethod() and invokeMethod(), you can give your object
    methods.
*/
class JUCE_API  DynamicObject  : public ReferenceCountedObject
{
public:
    //==============================================================================
    DynamicObject();
    DynamicObject (const DynamicObject&);
    ~DynamicObject();

    typedef ReferenceCountedObjectPtr<DynamicObject> Ptr;

    //==============================================================================
    /** Returns true if the object has a property with this name.
        Note that if the property is actually a method, this will return false.
    */
    virtual bool hasProperty (const Identifier& propertyName) const;

    /** Returns a named property.
        This returns var::null if no such property exists.
    */
    virtual var getProperty (const Identifier& propertyName) const;

    /** Sets a named property. */
    virtual void setProperty (const Identifier& propertyName, const var& newValue);

    /** Removes a named property. */
    virtual void removeProperty (const Identifier& propertyName);

    //==============================================================================
    /** Checks whether this object has the specified method.

        The default implementation of this just checks whether there's a property
        with this name that's actually a method, but this can be overridden for
        building objects with dynamic invocation.
    */
    virtual bool hasMethod (const Identifier& methodName) const;

    /** Invokes a named method on this object.

        The default implementation looks up the named property, and if it's a method
        call, then it invokes it.

        This method is virtual to allow more dynamic invocation to used for objects
        where the methods may not already be set as properies.
    */
    virtual var invokeMethod (Identifier methodName,
                              const var::NativeFunctionArgs& args);

    /** Adds a method to the class.

        This is basically the same as calling setProperty (methodName, (var::NativeFunction) myFunction), but
        helps to avoid accidentally invoking the wrong type of var constructor. It also makes
        the code easier to read,
    */
    void setMethod (Identifier methodName, var::NativeFunction function);

    //==============================================================================
    /** Removes all properties and methods from the object. */
    void clear();

    /** Returns the NamedValueSet that holds the object's properties. */
    NamedValueSet& getProperties() noexcept     { return properties; }

    /** Calls var::clone() on all the properties that this object contains. */
    void cloneAllProperties();

    //==============================================================================
    /** Returns a clone of this object.
        The default implementation of this method just returns a new DynamicObject
        with a (deep) copy of all of its properties. Subclasses can override this to
        implement their own custom copy routines.
    */
    virtual Ptr clone();

    //==============================================================================
    /** Writes this object to a text stream in JSON format.
        This method is used by JSON::toString and JSON::writeToStream, and you should
        never need to call it directly, but it's virtual so that custom object types
        can stringify themselves appropriately.
    */
    virtual void writeAsJSON (OutputStream&, int indentLevel, bool allOnOneLine);

private:
    //==============================================================================
    NamedValueSet properties;

   #if JUCE_CATCH_DEPRECATED_CODE_MISUSE
    // These methods have been deprecated - use var::invoke instead
    virtual void invokeMethod (const Identifier&, const var*, int) {}
   #endif

    JUCE_LEAK_DETECTOR (DynamicObject)
};



#endif   // JUCE_DYNAMICOBJECT_H_INCLUDED