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/* This file is part of the KDE project.
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Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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This library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2.1 or 3 of the License.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mediaobject.h"
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#include "mmf_medianode.h"
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QT_BEGIN_NAMESPACE
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using namespace Phonon;
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using namespace Phonon::MMF;
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/*! \class MMF::MediaNode
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\internal
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*/
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MMF::MediaNode::MediaNode(QObject *parent) : QObject::QObject(parent)
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, m_source(0)
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, m_target(0)
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, m_isApplied(false)
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{
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}
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bool MMF::MediaNode::connectMediaNode(MediaNode *target)
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{
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m_target = target;
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m_target->setSource(this);
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return applyNodesOnMediaObject(target);
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}
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bool MMF::MediaNode::disconnectMediaNode(MediaNode *target)
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{
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Q_UNUSED(target);
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m_target = 0;
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m_isApplied = false;
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return true;
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}
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void MMF::MediaNode::setSource(MediaNode *source)
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{
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m_source = source;
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}
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MMF::MediaNode *MMF::MediaNode::source() const
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{
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return m_source;
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}
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MMF::MediaNode *MMF::MediaNode::target() const
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{
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return m_target;
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}
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bool MMF::MediaNode::applyNodesOnMediaObject(MediaNode *)
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{
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// Algorithmically, this can be expressed in a more efficient way by
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// exercising available assumptions, but it complicates code for input
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// data(length of the graph) which typically is very small.
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// First, we go to the very beginning of the graph.
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MMF::MediaNode *current = this;
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do {
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MediaNode *const candidate = current->source();
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if (candidate)
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current = candidate;
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else
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break;
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}
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while (current);
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// Now we do two things, while walking to the other end:
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// 1. Find the MediaObject, if present
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// 2. Collect a list of all unapplied MediaNodes
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QList<MediaNode *> unapplied;
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MMF::MediaObject *mo = 0;
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do {
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if (!current->m_isApplied)
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unapplied.append(current);
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if (!mo)
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mo = qobject_cast<MMF::MediaObject *>(current);
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current = current->target();
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}
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while (current);
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// Now, lets activate all the objects, if we found the MediaObject.
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if (mo) {
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for (int i = 0; i < unapplied.count(); ++i) {
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MediaNode *const at = unapplied.at(i);
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// We don't want to apply MediaObject on itself.
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if (at != mo)
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at->activateOnMediaObject(mo);
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}
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}
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return true;
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}
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QT_END_NAMESPACE
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