plasma-framework/runnercontext.cpp
Jacopo De Simoi 7e598b49ec Invalidate the context using a dummy pointer instead of 0. This avoids emitting to a null pointer.
BUG: 188940

svn path=/trunk/KDE/kdelibs/; revision=957813
2009-04-22 22:50:20 +00:00

388 lines
11 KiB
C++

/*
* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
*
* This program 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, or
* (at your option) any later version.
*
* This program 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 General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "runnercontext.h"
#include <QReadWriteLock>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QSharedData>
#include <kcompletion.h>
#include <kdebug.h>
#include <kmimetype.h>
#include <kshell.h>
#include <kstandarddirs.h>
#include <kurl.h>
#include "abstractrunner.h"
#include "querymatch.h"
//#define LOCK_FOR_READ(context) if (context->d->policy == Shared) { context->d->lock.lockForRead(); }
//#define LOCK_FOR_WRITE(context) if (context->d->policy == Shared) { context->d->lock.lockForWrite(); }
//#define UNLOCK(context) if (context->d->policy == Shared) { context->d->lock.unlock(); }
#define LOCK_FOR_READ(context) context->d->lock.lockForRead();
#define LOCK_FOR_WRITE(context) context->d->lock.lockForWrite();
#define UNLOCK(context) context->d->lock.unlock();
namespace Plasma
{
/*
Corrects the case of the last component in a path (e.g. /usr/liB -> /usr/lib)
path: The path to be processed.
correctCasePath: The corrected-case path
mustBeDir: Tells whether the last component is a folder or doesn't matter
Returns true on success and false on error, in case of error, correctCasePath is not modified
*/
bool correctLastComponentCase(const QString &path, QString &correctCasePath, const bool mustBeDir)
{
//kDebug() << "Correcting " << path;
// If the file already exists then no need to search for it.
if (QFile::exists(path)) {
correctCasePath = path;
//kDebug() << "Correct path is" << correctCasePath;
return true;
}
const QFileInfo pathInfo(path);
const QDir fileDir = pathInfo.dir();
//kDebug() << "Directory is" << fileDir;
const QString filename = pathInfo.fileName();
//kDebug() << "Filename is" << filename;
//kDebug() << "searching for a" << (mustBeDir ? "directory" : "directory/file");
const QStringList matchingFilenames = fileDir.entryList(QStringList(filename),
mustBeDir ? QDir::Dirs : QDir::NoFilter);
if (matchingFilenames.empty()) {
//kDebug() << "No matches found!!\n";
return false;
} else {
/*if (matchingFilenames.size() > 1) {
kDebug() << "Found multiple matches!!\n";
}*/
if (fileDir.path().endsWith(QDir::separator())) {
correctCasePath = fileDir.path() + matchingFilenames[0];
} else {
correctCasePath = fileDir.path() + QDir::separator() + matchingFilenames[0];
}
//kDebug() << "Correct path is" << correctCasePath;
return true;
}
}
/*
Corrects the case of a path (e.g. /uSr/loCAL/bIN -> /usr/local/bin)
path: The path to be processed.
corrected: The corrected-case path
Returns true on success and false on error, in case of error, corrected is not modified
*/
bool correctPathCase(const QString& path, QString &corrected)
{
// early exit check
if (QFile::exists(path)) {
corrected = path;
return true;
}
// path components
QStringList components = QString(path).split(QDir::separator());
if (components.size() < 2) {
return false;
}
const bool mustBeDir = components.back().isEmpty();
//kDebug() << "Components are" << components;
QString correctPath;
if (components.back().isEmpty()) {
components.pop_back();
}
const unsigned initialComponents = components.size();
for (unsigned i = 0; i < initialComponents - 1; i ++) {
const QString tmp = components[0] + QDir::separator() + components[1];
if (!correctLastComponentCase(tmp, correctPath, components.size() > 2 || mustBeDir)) {
//kDebug() << "search was not successfull";
return false;
}
components.removeFirst();
components[0] = correctPath;
}
corrected = correctPath;
return true;
}
class RunnerContextPrivate : public QSharedData
{
public:
RunnerContextPrivate(RunnerContext *context)
: QSharedData(),
type(RunnerContext::UnknownType),
q(context)
{
}
RunnerContextPrivate(const RunnerContextPrivate &p)
: QSharedData(),
type(RunnerContext::None),
q(p.q)
{
//kDebug() << "¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿boo yeah" << type;
}
~RunnerContextPrivate()
{
}
/**
* Determines type of query
*/
void determineType()
{
// NOTE! this method must NEVER be called from
// code that may be running in multiple threads
// with the same data.
type = RunnerContext::UnknownType;
QString path = QDir::cleanPath(KShell::tildeExpand(term));
int space = path.indexOf(' ');
if (!KStandardDirs::findExe(path.left(space)).isEmpty()) {
// it's a shell command if there's a space because that implies
// that it has arguments!
type = (space > 0) ? RunnerContext::ShellCommand :
RunnerContext::Executable;
} else {
KUrl url(term);
QString correctCasePath;
if (!url.protocol().isEmpty() && !url.isLocalFile()) {
type = RunnerContext::NetworkLocation;
} else if (correctPathCase(path, correctCasePath)) {
path = correctCasePath;
QFileInfo info(path);
if (info.isSymLink()) {
path = info.canonicalFilePath();
info = QFileInfo(path);
}
if (info.isDir()) {
type = RunnerContext::Directory;
mimeType = "inode/folder";
} else if (info.isFile()) {
type = RunnerContext::File;
KMimeType::Ptr mimeTypePtr = KMimeType::findByPath(path);
if (mimeTypePtr) {
mimeType = mimeTypePtr->name();
}
}
}
}
}
void invalidate()
{
q = &s_dummyContext;
}
QReadWriteLock lock;
QList<QueryMatch> matches;
QMap<QString, const QueryMatch*> matchesById;
QString term;
QString mimeType;
RunnerContext::Type type;
RunnerContext * q;
static RunnerContext s_dummyContext;
};
RunnerContext RunnerContextPrivate::s_dummyContext;
RunnerContext::RunnerContext(QObject *parent)
: QObject(parent),
d(new RunnerContextPrivate(this))
{
}
//copy ctor
RunnerContext::RunnerContext(RunnerContext &other, QObject *parent)
: QObject(parent)
{
LOCK_FOR_READ((&other))
d = other.d;
UNLOCK((&other))
}
RunnerContext::~RunnerContext()
{
}
void RunnerContext::reset()
{
// We will detach if we are a copy of someone. But we will reset
// if we are the 'main' context others copied from. Resetting
// one RunnerContext makes all the copies obsolete.
// We need to mark the q pointer of the detached RunnerContextPrivate
// as dirty on detach to avoid receiving results for old queries
d->invalidate();
d.detach();
// Now that we detached the d pointer we need to reset its q pointer
d->q = this;
// we still have to remove all the matches, since if the
// ref count was 1 (e.g. only the RunnerContext is using
// the dptr) then we won't get a copy made
if (!d->matches.isEmpty()) {
d->matchesById.clear();
d->matches.clear();
emit matchesChanged();
}
d->term.clear();
d->mimeType.clear();
d->type = UnknownType;
//kDebug() << "match count" << d->matches.count();
}
void RunnerContext::setQuery(const QString &term)
{
reset();
if (term.isEmpty()) {
return;
}
d->term = term;
d->determineType();
}
QString RunnerContext::query() const
{
// the query term should never be set after
// a search starts. in fact, reset() ensures this
// and setQuery(QString) calls reset()
return d->term;
}
RunnerContext::Type RunnerContext::type() const
{
return d->type;
}
QString RunnerContext::mimeType() const
{
return d->mimeType;
}
bool RunnerContext::isValid()
{
// if our qptr is dirty, we aren't useful anymore
return (d->q != &(d->s_dummyContext));
}
bool RunnerContext::addMatches(const QString &term, const QList<QueryMatch> &matches)
{
Q_UNUSED(term)
if (matches.isEmpty() || !isValid()) {
//Bail out if the query is empty or the qptr is dirty
return false;
}
LOCK_FOR_WRITE(this)
foreach (const QueryMatch &match, matches) {
d->matches.append(match);
#ifndef NDEBUG
if (d->matchesById.contains(match.id())) {
kDebug() << "Duplicate match id " << match.id() << "from" << match.runner()->name();
}
#endif
d->matchesById.insert(match.id(), &d->matches.at(d->matches.size() - 1));
}
UNLOCK(this);
//kDebug()<< "add matches";
// A copied searchContext may share the d pointer,
// we always want to sent the signal of the object that created
// the d pointer
emit d->q->matchesChanged();
return true;
}
bool RunnerContext::addMatch(const QString &term, const QueryMatch &match)
{
Q_UNUSED(term)
if (!isValid()) {
// Bail out if the qptr is dirty
return false;
}
LOCK_FOR_WRITE(this)
d->matches.append(match);
d->matchesById.insert(match.id(), &d->matches.at(d->matches.size() - 1));
UNLOCK(this);
//kDebug()<< "added match" << match->text();
emit d->q->matchesChanged();
return true;
}
QList<QueryMatch> RunnerContext::matches() const
{
LOCK_FOR_READ(this)
QList<QueryMatch> matches = d->matches;
UNLOCK(this);
return matches;
}
QueryMatch RunnerContext::match(const QString &id) const
{
LOCK_FOR_READ(this)
const QueryMatch *match = d->matchesById.value(id, 0);
UNLOCK(this)
if (match) {
return *match;
}
return QueryMatch(0);
}
} // Plasma namespace
#include "runnercontext.moc"