--- /dev/null
+/****************************************************************************
+**
+** Copyright (C) Qxt Foundation. Some rights reserved.
+**
+** This file is part of the QxtCore module of the Qt eXTension library
+**
+** This library is free software; you can redistribute it and/or modify it
+** under the terms of th Common Public License, version 1.0, as published by
+** IBM.
+**
+** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY
+** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
+** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
+** FITNESS FOR A PARTICULAR PURPOSE.
+**
+** You should have received a copy of the CPL along with this file.
+** See the LICENSE file and the cpl1.0.txt file included with the source
+** distribution for more information. If you did not receive a copy of the
+** license, contact the Qxt Foundation.
+**
+** <http://libqxt.sourceforge.net> <foundation@libqxt.org>
+**
+****************************************************************************/
+
+#include "qxtpipe.h"
+#include <QList>
+#include <QQueue>
+#include <QMutableListIterator>
+
+/**
+ * \class QxtPipe QxtPipe
+ * \ingroup QxtCore
+ * \brief a pipeable QIODevice
+ *
+ * pipes can be connected to other pipes, to exchange data \n
+ * The default implementation uses a buffer. \n
+ * Reimplement to make your custom class able to be connected into a pipe chain. \n
+ *
+ * Example usage:
+ * \code
+ * QxtPipe p1;
+ * QxtPipe p2;
+ * p1|p2;
+ * p1.write("hello world");
+ * qDebug()<<p2.readAll();
+ * \endcode
+*/
+
+
+struct Connection
+{
+ QxtPipe * pipe;
+ QIODevice::OpenMode mode;
+ Qt::ConnectionType connectionType;
+};
+
+class QxtPipePrivate:public QxtPrivate<QxtPipe>
+{
+ public:
+ QQueue<char> q;
+ QList<Connection> connections;
+};
+
+/**
+ * Contructs a new QxtPipe.
+ */
+QxtPipe::QxtPipe(QObject * parent):QIODevice(parent)
+{
+ setOpenMode (QIODevice::ReadWrite);
+}
+
+
+/** reimplemented from QIODevice*/
+bool QxtPipe::isSequential () const
+{
+ return true;
+}
+
+/** reimplemented from QIODevice*/
+qint64 QxtPipe::bytesAvailable () const
+{
+ return qxt_d().q.count();
+}
+
+/**
+ * pipes the output of this instance to the \p other QxtPipe using the given mode and connectiontype \n
+ * connection pipes with this function can be considered thread safe \n
+ *
+ * Example usage:
+ * \code
+ QxtPipe p1;
+ QxtPipe p2;
+ p1.connect(&p2,QIODevice::ReadOnly);
+
+ ///this data will go nowhere. p2 is connected to p1, but not p2 to p1.
+ p1.write("hello");
+
+ ///while this data will end up in p1
+ p2.write("world");
+
+ qDebug()<<p1.readAll();
+
+ * \endcode
+
+ */
+bool QxtPipe::connect (QxtPipe * other ,QIODevice::OpenMode mode,Qt::ConnectionType connectionType)
+{
+
+ ///tell the other pipe to write into this
+ if(mode & QIODevice::ReadOnly)
+ {
+ other->connect(this,QIODevice::WriteOnly,connectionType);
+ }
+
+
+ Connection c;
+ c.pipe=other;
+ c.mode=mode;
+ c.connectionType=connectionType;
+ qxt_d().connections.append(c);
+
+ return true;
+}
+
+/**
+ * cuts the pipe to the \p other QxtPipe
+ */
+bool QxtPipe::disconnect (QxtPipe * other )
+{
+ bool e=false;
+
+ QMutableListIterator<Connection> i(qxt_d().connections);
+ while (i.hasNext())
+ {
+ i.next();
+ if(i.value().pipe==other)
+ {
+ i.remove();
+ e=true;
+ other->disconnect(this);
+ }
+ }
+
+ return e;
+}
+
+/**
+ * convinence function for QxtPipe::connect.
+ * pipes the output of this instance to the \p other QxtPipe in readwrite mode with autoconnection
+ */
+QxtPipe & QxtPipe::operator | ( QxtPipe & target)
+{
+ connect(&target);
+ return *this;
+}
+
+/** reimplemented from QIODevice*/
+qint64 QxtPipe::readData ( char * data, qint64 maxSize )
+{
+ QQueue<char> * q=&qxt_d().q;
+
+ qint64 i=0;
+ for (;i<maxSize;i++)
+ {
+ if (q->isEmpty())
+ break;
+ (*data++)=q->dequeue();
+ }
+ return i;
+}
+
+/** reimplemented from QIODevice*/
+qint64 QxtPipe::writeData ( const char * data, qint64 maxSize )
+{
+ foreach(Connection c,qxt_d().connections)
+ {
+
+ if(!(c.mode & QIODevice::WriteOnly))
+ continue;
+
+ //we want thread safety, so we use a QByteArray instead of the raw data. that migth be slow
+ QMetaObject::invokeMethod(c.pipe, "receiveData",c.connectionType,
+ Q_ARG(QByteArray, data),Q_ARG(QxtPipe *,this));
+
+ }
+ return maxSize;
+}
+
+
+/**
+receiveData is called from any connected pipe to input data into this instance.
+*/
+qint64 QxtPipe::receiveData (QByteArray datab ,QxtPipe * sender)
+{
+ QQueue<char> * q=&qxt_d().q;
+
+ const char * data =datab.constData();
+ qint64 maxSize =datab.size();
+
+ qint64 i=0;
+ for (;i<maxSize;i++)
+ q->enqueue(*data++);
+
+
+ foreach(Connection c,qxt_d().connections)
+ {
+
+ //don't write back to sender
+ if(c.pipe==sender)
+ continue;
+
+ if(!(c.mode & QIODevice::WriteOnly))
+ continue;
+
+
+ QMetaObject::invokeMethod(c.pipe, "receiveData",c.connectionType,
+ Q_ARG(QByteArray, datab),Q_ARG(QxtPipe *,this));
+ }
+
+
+ if (i>0)
+ emit(readyRead ());
+
+ return maxSize;
+}
+
projects / quassel.git / blobdiff