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// -*- c++ -*-
/*
* Copyright (C) 2001-2004, Richard J. Moore <rich@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef KJSEMBEDJSPROXY_H
#define KJSEMBEDJSPROXY_H
#include <kjs/object.h>
#include "global.h"
namespace KJSEmbed {
class JSObjectProxy;
class JSValueProxy;
class JSOpaqueProxy;
/**
* Base class for all proxy objects.
*
* @version $Id$
* @author Richard Moore, rich@kde.org
*/
class KJSEMBED_EXPORT JSProxy : public KJS::ObjectImp
{
public:
/** Identifiers for the various types of proxy. */
enum ProxyType {
UnknownProxy,
ObjectProxy,
ValueProxy,
OpaqueProxy,
BuiltinProxy
};
/** Identifies the owner of the currently wrapped pointer */
enum Owner { Native, /** This is a C++ pointer and it will not be deleted by the garbage collector */
JavaScript /** This pointer is owned by Javascript and it will be deleted by the garbage collector */
};
/**
* Structure to store information about a method.
*/
struct MethodTable {
int id;
const char *name;
};
/**
* Adds a @ref MethodTable of methods to an object.
* Note: The method table MUST end in a {0,0} entry.
*/
template< class T >
static void addMethods( KJS::ExecState *exec, MethodTable *table, KJS::Object &object )
{
int idx = 0;
if( !table[idx].name ) return; // check for empty list
do {
T *meth = new T( exec, table[idx].id );
object.put( exec , table[idx].name, KJS::Object(meth), KJS::Function );
++idx;
} while( table[idx].name );
}
/**
* Structure to store information about enums.
*/
struct EnumTable {
const char *id;
int val;
};
/**
* Adds a @ref EnumTable of static values to an object.
* Note: The method table MUST end in a {0,0} entry.
*/
static void addEnums( KJS::ExecState *exec, EnumTable *table, KJS::Object &object );
/**
* Checks to see if an object is a desired type.
* @param object - the object you want to test.
* @param prxyType - the type of prxy you want.
* @param classname - the name of the class you want.
* @returns if the two above conditions are met.
*/
static bool checkType( const KJS::Object &object, ProxyType prxyType, const QString &classname);
JSProxy( int type );
virtual ~JSProxy();
/** Returns the string value of the class name **/
virtual QString typeName() const = 0;
/** Returns true iff the content of this proxy inherits the specified base-class. */
virtual bool inherits( const char *clazz ) = 0;
/** Returns the type of the proxy. */
int proxyType() const { return proxytype; }
/** Returns true iff this is a JSObjectProxy. */
bool isObjectProxy() const { return proxytype == ObjectProxy; }
/** Returns true iff this is a JSValueProxy. */
bool isValueProxy() const { return proxytype == ValueProxy; }
/** Returns true iff this is a JSOpaqueProxy. */
bool isOpaqueProxy() const { return proxytype == OpaqueProxy; }
/** Returns this object as a JSObjectProxy or 0 if the type is wrong. */
JSObjectProxy *toObjectProxy();
/** Returns this object as a JSValueProxy or 0 if the type is wrong. */
JSValueProxy *toValueProxy();
/** Returns this object as a JSOpaqueProxy or 0 if the type is wrong. */
JSOpaqueProxy *toOpaqueProxy();
/**
* Converts the specified ValueImp to a JSProxy if possible, if the
* ValueImp is not a JSProxy then 0 is returned.
*/
static JSProxy *toProxy( KJS::ValueImp *imp );
/**
* Converts the specified ValueImp to a JSObjectProxy if possible, if the
* ValueImp is not a JSObjectProxy then 0 is returned.
*/
static JSObjectProxy *toObjectProxy( KJS::ValueImp *imp );
/**
* Converts the specified ValueImp to a JSValueProxy if possible, if the
* ValueImp is not a JSValueProxy then 0 is returned.
*/
static JSValueProxy *toValueProxy( KJS::ValueImp *imp );
/**
* Converts the specified ValueImp to a JSOpaqueProxy if possible, if the
* ValueImp is not a JSOpaqueProxy then 0 is returned.
*/
static JSOpaqueProxy *toOpaqueProxy( KJS::ValueImp *imp );
/**
* Transfers ownership of the contained pointer to C++ or Javascript.
* JavaScript - Javascript GC will delete the pointer
* Native - Javascript will not delete the pointer, but just the proxy.
*/
void setOwner( Owner state = Native );
/**
* Returns the current ownership.
*/
Owner owner() const;
protected:
/**
* Who really owns the current pointer
*/
Owner ownership;
private:
int proxytype;
class JSProxyPrivate *d;
};
} // namespace KJSEmbed
#endif // KJSEMBEDJSPROXYIMP_H
// Local Variables:
// c-basic-offset: 4
// End:
|
