qtmobility/src/publishsubscribe/contextkitlayer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 16 Apr 2010 15:51:22 +0300
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Mobility Components.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qvaluespace.h"
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#include "qvaluespace_p.h"
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#include <QSet>
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#include <QDebug>
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#include <contextproperty.h>
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#include <contextregistryinfo.h>
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QTM_BEGIN_NAMESPACE
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using namespace QValueSpace;
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/* ContextKit layer
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   This layer makes ContextKit properties visible in the QValueSpace.
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   You can not publish values of ContextKit properties using the
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   QValueSpace.  This might be fixed later.
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   ContextKit properties have names with dots in them, which allows
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   these properties to be arranged in a tree.  The context commander
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   does this in its UI, for example.
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   However, the ContextKit itself does not pay attention to the dots
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   at all: properties just have names and there are no such things as
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   parent / child / sibling relations between properties.  For
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   example, there is a property called "Battery.ChargeLevel", but the
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   ContextKit doesn't know anything about "Battery".  Subscribing to
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   "Battery" is exactly the same as subscribing to any other
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   non-declared property.  When "Battery.ChargeLevel" changes,
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   "Battery" does _not_ receive a change notification.
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   The QValueSpace, on the other hand, has a explicit tree-structure:
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   the key "/foo" represents all its children, like "/foo/bar".  When
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   "/foo/bar" changes, "/foo" _does_ receive a change notification.
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   There are two ways to map ContextKit properties into the
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   QValueSpace: simply as a long list of siblings (a one-level tree),
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   or as the multi-level tree that is implied by their names.
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   We do the latter since that is more natural.  For example, the
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   ContextKit property "Battery.ChargeLevel" is mapped to
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   "/Battery/ChargeLevel", and the key "/Battery" gets a change
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   notifications for all its children.
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*/
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/* ContextKitHandle - contains a ContextKit property and all its
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                      direct and indirect children.
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   ContextKitHandles do not form a hierarchy between each other; think
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   of them as individual little trees that are created in direct
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   response to requests to the ContextKitLayer.  The properties in
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   these trees can overlap; a single ContextKit property can be
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   accessed via many ContextKitHandles.
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 */
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class ContextKitHandle : public QObject {
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    Q_OBJECT
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public:
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    ContextKitHandle (ContextKitHandle *parent, const QString &root);
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    ~ContextKitHandle ();
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    bool value (const QString &path, QVariant *data);
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    void subscribe ();
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    void unsubscribe ();
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    QSet<QString> children ();
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   110
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signals:
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    void valueChanged();
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   113
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private:
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    QString prefix;
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    QHash<QString, ContextProperty *> props;
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    void insert (const QString &path, const QString &key);
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};
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void ContextKitHandle::insert (const QString &path, const QString &key)
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{
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    ContextProperty *prop = new ContextProperty (key);
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    connect (prop, SIGNAL (valueChanged()),
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             this, SIGNAL (valueChanged()));
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    props.insert (path, prop);
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}
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ContextKitHandle::ContextKitHandle (ContextKitHandle *parent, const QString &path)
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{
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    QString key = path;
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    if (key.startsWith("/"))
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        key = key.mid(1);
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    key = key.replace('/', '.');
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    if (parent)
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        key = parent->prefix + key;
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    prefix = (key == "")? "" : key + ".";
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    foreach (const QString &k, ContextRegistryInfo::instance()->listKeys())
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    {
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        if (k == key)
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            insert ("", k);
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        else if (k.startsWith (prefix))
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            insert (k.mid(prefix.length()).replace ('.', '/'), k);
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    }
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}
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ContextKitHandle::~ContextKitHandle ()
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{
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    foreach (ContextProperty *prop, props.values())
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        delete prop;
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}
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bool
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ContextKitHandle::value (const QString &path, QVariant *data)
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{
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    // path always starts with a "/".
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    ContextProperty *p = props.value (path.mid(1));
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    if (p)
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    {
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        *data = p->value();
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        return true;
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    }
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    else
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        return false;
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}
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   167
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void
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ContextKitHandle::subscribe ()
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{
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    foreach (ContextProperty *p, props.values())
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        p->subscribe ();
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}
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   174
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void
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ContextKitHandle::unsubscribe ()
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{
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    foreach (ContextProperty *p, props.values())
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        p->unsubscribe ();
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}
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QSet<QString>
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ContextKitHandle::children ()
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{
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    QSet<QString> kids;
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    foreach (const QString &path, props.keys())
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    {
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        int pos = path.indexOf("/");
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        if (pos >= 0)
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            kids.insert (path.left(pos));
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        else
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            kids.insert (path);
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    }
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    return kids;
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}
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   197
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/* ContextKitLayer - implements QAbstractValueSpaceLayer interface to
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                     hook ContextKit into QValueSpace.
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   It mainly creates ContextKitHandles and dispatches to them.
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*/
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   203
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class ContextKitLayer : public QAbstractValueSpaceLayer
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{
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    Q_OBJECT
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public:
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    ContextKitLayer();
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    virtual ~ContextKitLayer();
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    /* ValueSpaceLayer interface - Common functions */
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    QString name();
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    bool startup(Type);
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    QUuid id();
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    unsigned int order();
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    LayerOptions layerOptions() const;
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    Handle item(Handle parent, const QString &);
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    void removeHandle(Handle);
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    void setProperty(Handle handle, Properties);
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   222
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    bool value(Handle, QVariant *);
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    bool value(Handle, const QString &, QVariant *);
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    QSet<QString> children(Handle);
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    /* ValueSpaceLayer interface - QValueSpaceSubscriber functions */
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    bool supportsInterestNotification() const { return true; }
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    bool notifyInterest(Handle handle, bool interested);
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    /* ValueSpaceLayer interface - QValueSpacePublisher functions */
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    bool setValue(QValueSpacePublisher *, Handle, const QString &, const QVariant &) { return false; }
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    bool removeValue(QValueSpacePublisher *, Handle, const QString &) { return false; }
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    bool removeSubTree(QValueSpacePublisher *, Handle) { return false; }
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    void addWatch(QValueSpacePublisher *, Handle) { return; }
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    void removeWatches(QValueSpacePublisher *, Handle) { return; }
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    void sync() { return; }
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    static ContextKitLayer *instance();
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private slots:
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    void contextHandleChanged();
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};
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QVALUESPACE_AUTO_INSTALL_LAYER(ContextKitLayer);
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ContextKitLayer::ContextKitLayer ()
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{
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}
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ContextKitLayer::~ContextKitLayer ()
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{
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}
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Q_GLOBAL_STATIC(ContextKitLayer, contextKitLayer);
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ContextKitLayer *ContextKitLayer::instance ()
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{
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    return contextKitLayer ();
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}
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QString ContextKitLayer::name()
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{
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    return "ContextKit Layer";
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}
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bool ContextKitLayer::startup(Type)
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{
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    return true;
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}
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QUuid ContextKitLayer::id()
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{
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    return QVALUESPACE_CONTEXTKIT_LAYER;
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}
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unsigned int ContextKitLayer::order()
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{
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    return 0;
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}
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LayerOptions ContextKitLayer::layerOptions () const
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{
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    return TransientLayer | ReadOnlyLayer;
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}
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QAbstractValueSpaceLayer::Handle ContextKitLayer::item (Handle parent, const QString &subPath)
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{
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    return (Handle) new ContextKitHandle ((parent == InvalidHandle)
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                                          ? NULL
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                                          : (ContextKitHandle *) parent,
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                                          subPath);
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}
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void ContextKitLayer::removeHandle (Handle handle)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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    delete h;
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}
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void ContextKitLayer::setProperty (Handle handle, Properties properties)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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    if (properties & Publish)
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        connect (h, SIGNAL(valueChanged()),
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                 this, SLOT(contextHandleChanged()));
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    else
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        disconnect (h, SIGNAL(valueChanged()),
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                    this, SLOT(contextHandleChanged()));
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}
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   311
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void ContextKitLayer::contextHandleChanged()
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{
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    ContextKitHandle *h = (ContextKitHandle *)sender();
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    emit handleChanged ((Handle) h);
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}
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   317
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bool ContextKitLayer::value (Handle handle, QVariant *data)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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    return h->value ("", data);
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}
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   323
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bool ContextKitLayer::value (Handle handle, const QString &subPath, QVariant *data)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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    return h->value (subPath, data);
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}
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bool ContextKitLayer::notifyInterest(Handle handle, bool interested)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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   333
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   334
    if (interested)
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        h->subscribe();
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    else
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        h->unsubscribe();
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    return true;
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}
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QSet<QString> ContextKitLayer::children (Handle handle)
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{
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    ContextKitHandle *h = (ContextKitHandle *)handle;
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    return h->children ();
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}
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#include "contextkitlayer.moc"
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QTM_END_NAMESPACE
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