vstcomponentbase.cpp

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//-----------------------------------------------------------------------------
// Project     : VST SDK
//
// Category    : Helpers
// Filename    : public.sdk/source/vst/vstcomponentbase.cpp
// Created by  : Steinberg, 05/2005
// Description : Base class for VST Component and Edit Controller
//
//-----------------------------------------------------------------------------
// LICENSE
// (c) 2021, Steinberg Media Technologies GmbH, All Rights Reserved
//-----------------------------------------------------------------------------
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 
//   * Redistributions of source code must retain the above copyright notice, 
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation 
//     and/or other materials provided with the distribution.
//   * Neither the name of the Steinberg Media Technologies nor the names of its
//     contributors may be used to endorse or promote products derived from this 
//     software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
// IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE  OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//-----------------------------------------------------------------------------
 
#include "vstcomponentbase.h"
#include "base/source/fstring.h"
 
namespace Steinberg {
namespace Vst {
 
//------------------------------------------------------------------------
// ComponentBase Implementation
//------------------------------------------------------------------------
ComponentBase::ComponentBase ()
{
}
 
//------------------------------------------------------------------------
ComponentBase::~ComponentBase ()
{
}
 
//------------------------------------------------------------------------
tresult PLUGIN_API ComponentBase::initialize (FUnknown* context)
{
        // check if already initialized
        if (hostContext)
                return kResultFalse;
 
        hostContext = context;
 
        return kResultOk;
}
 
//------------------------------------------------------------------------
tresult PLUGIN_API ComponentBase::terminate ()
{
        // release host interfaces
        hostContext = nullptr;
 
        // in case host did not disconnect us,
        // release peer now
        if (peerConnection)
        {
                peerConnection->disconnect (this);
                peerConnection = nullptr;
        }
 
        return kResultOk;
}
 
//------------------------------------------------------------------------
tresult PLUGIN_API ComponentBase::connect (IConnectionPoint* other)
{
        if (!other)
                return kInvalidArgument;
 
        // check if already connected
        if (peerConnection)
                return kResultFalse;
 
        peerConnection = other;
        return kResultOk;
}
 
//------------------------------------------------------------------------
tresult PLUGIN_API ComponentBase::disconnect (IConnectionPoint* other)
{
        if (peerConnection && other == peerConnection)
        {
                peerConnection = nullptr;
                return kResultOk;
        }
        return kResultFalse;
}
 
//------------------------------------------------------------------------
tresult PLUGIN_API ComponentBase::notify (IMessage* message)
{
        if (!message)
                return kInvalidArgument;
 
        if (FIDStringsEqual (message->getMessageID (), "TextMessage"))
        {
                TChar string[256] = {0};
                if (message->getAttributes ()->getString ("Text", string, sizeof (string)) == kResultOk)
                {
                        String tmp (string);
                        tmp.toMultiByte (kCP_Utf8);
                        return receiveText (tmp.text8 ());
                }
        }
 
        return kResultFalse;
}
 
//------------------------------------------------------------------------
IMessage* ComponentBase::allocateMessage () const
{
        FUnknownPtr<IHostApplication> hostApp (hostContext);
        if (hostApp)
                return Vst::allocateMessage (hostApp);
        return nullptr;
}
 
//------------------------------------------------------------------------
tresult ComponentBase::sendMessage (IMessage* message) const
{
        if (message != nullptr && getPeer () != nullptr)
                return getPeer ()->notify (message);
        return kResultFalse;
}
 
//------------------------------------------------------------------------
tresult ComponentBase::sendTextMessage (const char8* text) const
{
        if (auto msg = owned (allocateMessage ()))
        {
                msg->setMessageID ("TextMessage");
                String tmp (text, kCP_Utf8);
                if (tmp.length () >= 256)
                        tmp.remove (255);
                msg->getAttributes ()->setString ("Text", tmp.text16 ());
                return sendMessage (msg);
        }
        return kResultFalse;
}
 
//------------------------------------------------------------------------
tresult ComponentBase::sendMessageID (const char* messageID) const
{
        if (auto msg = owned (allocateMessage ()))
        {
                msg->setMessageID (messageID);
                return sendMessage (msg);
        }
        return kResultFalse;
}
 
//------------------------------------------------------------------------
tresult ComponentBase::receiveText (const char8* /*text*/)
{
        return kResultOk;
}
 
//------------------------------------------------------------------------
} // namespace Vst
} // namespace Steinberg