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qgsproject.cpp
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qgsproject.cpp
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/***************************************************************************
qgsproject.cpp - description
-------------------
begin : July 23, 2004
copyright : (C) 2004 by Mark Coletti
email : mcoletti at gmail.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsproject.h"
#include <deque>
#include <memory>
#include "qgslogger.h"
#include "qgsrectangle.h"
#include "qgsvectorlayer.h"
#include "qgsrasterlayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsexception.h"
#include "qgsprojectproperty.h"
#include "qgslogger.h"
#include "qgsprojectfiletransform.h"
#include "qgsprojectversion.h"
#include "qgspluginlayer.h"
#include "qgspluginlayerregistry.h"
#include <QApplication>
#include <QFileInfo>
#include <QDomNode>
#include <QObject>
#include <QTextStream>
static const char *const ident_ = "$Id$";
// canonical project instance
QgsProject * QgsProject::theProject_;
/**
Take the given scope and key and convert them to a string list of key
tokens that will be used to navigate through a Property hierarchy
E.g., scope "someplugin" and key "/foo/bar/baz" will become a string list
of { "properties", "someplugin", "foo", "bar", "baz" }. "properties" is
always first because that's the permanent ``root'' Property node.
*/
static
QStringList makeKeyTokens_( QString const &scope, QString const &key )
{
// XXX - debugger probes
//const char * scope_str = scope.toLocal8Bit().data();
//const char * key_str = key.toLocal8Bit().data();
QStringList keyTokens = QStringList( scope );
keyTokens += key.split( '/', QString::SkipEmptyParts );
// be sure to include the canonical root node
keyTokens.push_front( "properties" );
return keyTokens;
} // makeKeyTokens_
/**
return the property that matches the given key sequence, if any
@param scope scope of key
@param key keyname
@param rootProperty is likely to be the top level QgsPropertyKey in QgsProject:e:Imp.
@return null if not found, otherwise located Property
*/
static
QgsProperty * findKey_( QString const & scope,
QString const & key,
QgsPropertyKey & rootProperty )
{
QgsPropertyKey * currentProperty = &rootProperty;
QgsProperty * nextProperty; // link to next property down hiearchy
QStringList keySequence = makeKeyTokens_( scope, key );
while ( ! keySequence.isEmpty() )
{
// if the current head of the sequence list matches the property name,
// then traverse down the property hierarchy
if ( keySequence.first() == currentProperty->name() )
{
// remove front key since we're traversing down a level
keySequence.pop_front();
// if we have only one key name left, then return the key found
if ( 1 == keySequence.count() )
{
return currentProperty->find( keySequence.front() );
}
// if we're out of keys then the current property is the one we
// want; i.e., we're in the rate case of being at the top-most
// property node
else if ( keySequence.isEmpty() )
{
return currentProperty;
}
else if (( nextProperty = currentProperty->find( keySequence.first() ) ) )
{
if ( nextProperty->isKey() )
{
currentProperty = dynamic_cast<QgsPropertyKey*>( nextProperty );
}
// it may be that this may be one of several property value
// nodes keyed by QDict string; if this is the last remaining
// key token and the next property is a value node, then
// that's the situation, so return the currentProperty
else if ( nextProperty->isValue() && ( 1 == keySequence.count() ) )
{
return currentProperty;
}
else // QgsPropertyValue not Key, so return null
{
return 0x0;
}
}
else // if the next key down isn't found
{ // then the overall key sequence doesn't exist
return 0x0;
}
}
else
{
return 0x0;
}
}
return 0x0;
} // findKey_
/** add the given key and value
@param scope scope of key
@param key key name
@param rootProperty is the property from which to start adding
@param value the value associated with the key
*/
static
QgsProperty * addKey_( QString const & scope,
QString const & key,
QgsPropertyKey * rootProperty,
QVariant value )
{
QStringList keySequence = makeKeyTokens_( scope, key );
// cursor through property key/value hierarchy
QgsPropertyKey * currentProperty = rootProperty;
QgsProperty * newProperty; // link to next property down hiearchy
while ( ! keySequence.isEmpty() )
{
// if the current head of the sequence list matches the property name,
// then traverse down the property hierarchy
if ( keySequence.first() == currentProperty->name() )
{
// remove front key since we're traversing down a level
keySequence.pop_front();
// if key sequence has one last element, then we use that as the
// name to store the value
if ( 1 == keySequence.count() )
{
currentProperty->setValue( keySequence.front(), value );
return currentProperty;
}
// we're at the top element if popping the keySequence element
// will leave it empty; in that case, just add the key
else if ( keySequence.isEmpty() )
{
currentProperty->setValue( value );
return currentProperty;
}
else if (( newProperty = currentProperty->find( keySequence.first() ) ) )
{
currentProperty = dynamic_cast<QgsPropertyKey*>( newProperty );
if ( currentProperty )
{
continue;
}
else // QgsPropertyValue not Key, so return null
{
return 0x0;
}
}
else // the next subkey doesn't exist, so add it
{
newProperty = currentProperty->addKey( keySequence.first() );
if ( newProperty )
{
currentProperty = dynamic_cast<QgsPropertyKey*>( newProperty );
}
continue;
}
}
else
{
return 0x0;
}
}
return 0x0;
} // addKey_
static
void removeKey_( QString const & scope,
QString const & key,
QgsPropertyKey & rootProperty )
{
QgsPropertyKey * currentProperty = &rootProperty;
QgsProperty * nextProperty = NULL; // link to next property down hiearchy
QgsPropertyKey * previousQgsPropertyKey = NULL; // link to previous property up hiearchy
QStringList keySequence = makeKeyTokens_( scope, key );
while ( ! keySequence.isEmpty() )
{
// if the current head of the sequence list matches the property name,
// then traverse down the property hierarchy
if ( keySequence.first() == currentProperty->name() )
{
// remove front key since we're traversing down a level
keySequence.pop_front();
// if we have only one key name left, then try to remove the key
// with that name
if ( 1 == keySequence.count() )
{
currentProperty->removeKey( keySequence.front() );
}
// if we're out of keys then the current property is the one we
// want to remove, but we can't delete it directly; we need to
// delete it from the parent property key container
else if ( keySequence.isEmpty() )
{
previousQgsPropertyKey->removeKey( currentProperty->name() );
}
else if (( nextProperty = currentProperty->find( keySequence.first() ) ) )
{
previousQgsPropertyKey = currentProperty;
currentProperty = dynamic_cast<QgsPropertyKey*>( nextProperty );
if ( currentProperty )
{
continue;
}
else // QgsPropertyValue not Key, so return null
{
return;
}
}
else // if the next key down isn't found
{ // then the overall key sequence doesn't exist
return;
}
}
else
{
return;
}
}
} // void removeKey_
struct QgsProject::Imp
{
/// current physical project file
QFile file;
/// property hierarchy
QgsPropertyKey properties_;
/// project title
QString title;
/// true if project has been modified since it has been read or saved
bool dirty;
Imp()
: title( "" ),
dirty( false )
{ // top property node is the root
// "properties" that contains all plug-in
// and extra property keys and values
properties_.name() = "properties"; // root property node always this value
}
/** clear project properties when a new project is started
*/
void clear()
{
//QgsDebugMsg( "Clearing project properties Impl->clear();" );
properties_.clearKeys();
title = "";
// reset some default project properties
// XXX THESE SHOULD BE MOVED TO STATUSBAR RELATED SOURCE
QgsProject::instance()->writeEntry( "PositionPrecision", "/Automatic", true );
QgsProject::instance()->writeEntry( "PositionPrecision", "/DecimalPlaces", 2 );
}
}; // struct QgsProject::Imp
QgsProject::QgsProject()
: imp_( new QgsProject::Imp ), mBadLayerHandler( new QgsProjectBadLayerDefaultHandler() )
{
// Set some default project properties
// XXX THESE SHOULD BE MOVED TO STATUSBAR RELATED SOURCE
writeEntry( "PositionPrecision", "/Automatic", true );
writeEntry( "PositionPrecision", "/DecimalPlaces", 2 );
// XXX writeEntry() makes the project dirty, but it doesn't make sense
// for a new project to be dirty, so let's clean it up
dirty( false );
} // QgsProject ctor
QgsProject::~QgsProject()
{
delete mBadLayerHandler;
// note that std::auto_ptr automatically deletes imp_ when it's destroyed
} // QgsProject dtor
QgsProject * QgsProject::instance()
{
if ( !QgsProject::theProject_ )
{
QgsProject::theProject_ = new QgsProject;
}
return QgsProject::theProject_;
} // QgsProject * instance()
void QgsProject::title( QString const &title )
{
imp_->title = title;
dirty( true );
} // void QgsProject::title
QString const & QgsProject::title() const
{
return imp_->title;
} // QgsProject::title() const
bool QgsProject::isDirty() const
{
return imp_->dirty;
} // bool QgsProject::isDirty()
void QgsProject::dirty( bool b )
{
imp_->dirty = b;
} // bool QgsProject::isDirty()
void QgsProject::setFileName( QString const &name )
{
imp_->file.setFileName( name );
dirty( true );
} // void QgsProject::setFileName( QString const & name )
QString QgsProject::fileName() const
{
return imp_->file.fileName();
} // QString QgsProject::fileName() const
/// basically a debugging tool to dump property list values
static void dump_( QgsPropertyKey const & topQgsPropertyKey )
{
QgsDebugMsg( "current properties:" );
topQgsPropertyKey.dump();
} // dump_
/**
Restore any optional properties found in "doc" to "properties".
properties tags for all optional properties. Within that there will be scope
tags. In the following example there exist one property in the "fsplugin"
scope. "layers" is a list containing three string values.
\verbatim
<properties>
<fsplugin>
<foo type="int" >42</foo>
<baz type="int" >1</baz>
<layers type="QStringList" >
<value>railroad</value>
<value>airport</value>
</layers>
<xyqzzy type="int" >1</xyqzzy>
<bar type="double" >123.456</bar>
<feature_types type="QStringList" >
<value>type</value>
</feature_types>
</fsplugin>
</properties>
\endverbatim
@param doc xml document
@param project_properties should be the top QgsPropertyKey node.
*/
static
void
_getProperties( QDomDocument const &doc, QgsPropertyKey & project_properties )
{
QDomNodeList properties = doc.elementsByTagName( "properties" );
if ( properties.count() > 1 )
{
QgsDebugMsg( "there appears to be more than one ``properties'' XML tag ... bailing" );
return;
}
else if ( properties.count() < 1 ) // no properties found, so we're done
{
return;
}
// item(0) because there should only be ONE
// "properties" node
QDomNodeList scopes = properties.item( 0 ).childNodes();
if ( scopes.count() < 1 )
{
QgsDebugMsg( "empty ``properties'' XML tag ... bailing" );
return;
}
QDomNode propertyNode = properties.item( 0 );
if ( ! project_properties.readXML( propertyNode ) )
{
QgsDebugMsg( "Project_properties.readXML() failed" );
}
// DEPRECATED as functionality has been shoved down to QgsProperyKey::readXML()
// size_t i = 0;
// while (i < scopes.count())
// {
// QDomNode curr_scope_node = scopes.item(i);
// qDebug("found %d property node(s) for scope %s",
// curr_scope_node.childNodes().count(),
// curr_scope_node.nodeName().utf8().constData());
// QString key(curr_scope_node.nodeName());
// QgsPropertyKey * currentKey =
// dynamic_cast<QgsPropertyKey*>(project_properties.find( key ));
// if ( ! currentKey )
// {
// // if the property key doesn't yet exist, create an empty instance
// // of that key
// currentKey = project_properties.addKey( key );
// if ( ! currentKey )
// {
// qDebug( "%s:%d unable to add key", __FILE__, __LINE__ );
// }
// }
// if (! currentKey->readXML(curr_scope_node))
// {
// qDebug("%s:%d unable to read XML for property %s", __FILE__, __LINE__,
// curr_scope_node.nodeName().utf8().constData());
// }
// ++i;
// }
} // _getProperties
/**
Get the project title
XML in file has this form:
\verbatim
<qgis projectname="default project">
<title>a project title</title>
\endverbatim
@todo XXX we should go with the attribute xor title, not both.
*/
static void _getTitle( QDomDocument const &doc, QString & title )
{
QDomNodeList nl = doc.elementsByTagName( "title" );
title = ""; // by default the title will be empty
if ( !nl.count() )
{
QgsDebugMsg( "unable to find title element" );
return;
}
QDomNode titleNode = nl.item( 0 ); // there should only be one, so zeroth element ok
if ( !titleNode.hasChildNodes() ) // if not, then there's no actual text
{
QgsDebugMsg( "unable to find title element" );
return;
}
QDomNode titleTextNode = titleNode.firstChild(); // should only have one child
if ( !titleTextNode.isText() )
{
QgsDebugMsg( "unable to find title element" );
return;
}
QDomText titleText = titleTextNode.toText();
title = titleText.data();
} // _getTitle
/** return the version string found in the given Dom document
@returns the version string or an empty string if none found
*/
static QgsProjectVersion _getVersion( QDomDocument const &doc )
{
QDomNodeList nl = doc.elementsByTagName( "qgis" );
if ( !nl.count() )
{
QgsDebugMsg( " unable to find qgis element in project file" );
return QgsProjectVersion( 0, 0, 0, QString( "" ) );
}
QDomNode qgisNode = nl.item( 0 ); // there should only be one, so zeroth element ok
QDomElement qgisElement = qgisNode.toElement(); // qgis node should be element
QgsProjectVersion projectVersion( qgisElement.attribute( "version" ) );
return projectVersion;
} // _getVersion
/**
Read map layers from project file
@returns \code QPair< bool, QList<QDomNode> > \endcode
bool is true if function worked; else is false.
list contains nodes corresponding to layers that couldn't be loaded
@note XML of form:
\verbatim
<maplayer type="vector">
<layername>Hydrop</layername>
<datasource>/data/usgs/city_shp/hydrop.shp</datasource>
<zorder>0</zorder>
<provider>ogr</provider>
<singlesymbol>
<renderitem>
<value>blabla</value>
<symbol>
<outlinecolor red="85" green="0" blue="255" />
<outlinestyle>SolidLine</outlinestyle>
<outlinewidth>1</outlinewidth>
<fillcolor red="0" green="170" blue="255" />
<fillpattern>SolidPattern</fillpattern>
</symbol>
<label>blabla</label>
</renderitem>
</singlesymbol>
<label>0</label>
<labelattributes>
<label text="Label" field="" />
<family name="Sans Serif" field="" />
<size value="12" units="pt" field="" />
<bold on="0" field="" />
<italic on="0" field="" />
<underline on="0" field="" />
<color red="0" green="0" blue="0" field="" />
<x field="" />
<y field="" />
<offset units="pt" x="0" xfield="" y="0" yfield="" />
<angle value="0" field="" />
<alignment value="center" field="" />
</labelattributes>
</maplayer>
\endverbatim
*/
QPair< bool, QList<QDomNode> > QgsProject::_getMapLayers( QDomDocument const &doc )
{
// Layer order is set by the restoring the legend settings from project file.
// This is done on the 'readProject( ... ) signal
QDomNodeList nl = doc.elementsByTagName( "maplayer" );
// XXX what is this used for? QString layerCount( QString::number(nl.count()) );
QString wk;
QList<QDomNode> brokenNodes; // a list of Dom nodes corresponding to layers
// that we were unable to load; this could be
// because the layers were removed or
// re-located after the project was last saved
// process the map layer nodes
if ( 0 == nl.count() ) // if we have no layers to process, bail
{
return qMakePair( true, brokenNodes ); // Decided to return "true" since it's
// possible for there to be a project with no
// layers; but also, more imporantly, this
// would cause the tests/qgsproject to fail
// since the test suite doesn't currently
// support test layers
}
bool returnStatus = true;
emit layerLoaded( 0, nl.count() );
QList<QgsVectorLayer*> vLayerList; //collect
for ( int i = 0; i < nl.count(); i++ )
{
QDomNode node = nl.item( i );
QDomElement element = node.toElement();
QString type = element.attribute( "type" );
QgsDebugMsg( "Layer type is " + type );
QgsMapLayer *mapLayer = NULL;
if ( type == "vector" )
{
mapLayer = new QgsVectorLayer;
}
else if ( type == "raster" )
{
mapLayer = new QgsRasterLayer;
}
else if ( type == "plugin" )
{
QString typeName = element.attribute( "name" );
mapLayer = QgsPluginLayerRegistry::instance()->createLayer( typeName );
}
Q_CHECK_PTR( mapLayer );
if ( !mapLayer )
{
QgsDebugMsg( "Unable to create layer" );
return qMakePair( false, brokenNodes );
}
// have the layer restore state that is stored in Dom node
if ( mapLayer->readXML( node ) )
{
mapLayer = QgsMapLayerRegistry::instance()->addMapLayer( mapLayer );
QgsVectorLayer* vLayer = qobject_cast<QgsVectorLayer*>( mapLayer );
if ( vLayer )
{
vLayerList.push_back( vLayer );
}
}
else
{
delete mapLayer;
QgsDebugMsg( "Unable to load " + type + " layer" );
returnStatus = false; // flag that we had problems loading layers
brokenNodes.push_back( node );
}
emit layerLoaded( i + 1, nl.count() );
}
//Update field map of layers with joins and create join caches if necessary
//Needs to be done here once all dependent layers are loaded
QList<QgsVectorLayer*>::iterator vIt = vLayerList.begin();
for ( ; vIt != vLayerList.end(); ++vIt )
{
( *vIt )->createJoinCaches();
( *vIt )->updateFieldMap();
}
return qMakePair( returnStatus, brokenNodes );
} // _getMapLayers
/**
Please note that most of the contents were copied from qgsproject
*/
bool QgsProject::read( QFileInfo const &file )
{
imp_->file.setFileName( file.filePath() );
return read();
} // QgsProject::read
/**
it's presumed that the caller has already reset the map canvas, map registry, and legend
*/
bool QgsProject::read()
{
clearError();
std::auto_ptr< QDomDocument > doc =
std::auto_ptr < QDomDocument > ( new QDomDocument( "qgis" ) );
if ( !imp_->file.open( QIODevice::ReadOnly ) )
{
imp_->file.close();
setError( tr( "Unable to open %1" ).arg( imp_->file.fileName() ) );
return false;
}
// location of problem associated with errorMsg
int line, column;
QString errorMsg;
if ( !doc->setContent( &imp_->file, &errorMsg, &line, &column ) )
{
// want to make this class as GUI independent as possible; so commented out
#if 0
QMessageBox::critical( 0, tr( "Project File Read Error" ),
tr( "%1 at line %2 column %3" ).arg( errorMsg ).arg( line ).arg( column ) );
#endif
QString errorString = tr( "Project file read error: %1 at line %2 column %3" )
.arg( errorMsg ).arg( line ).arg( column );
QgsDebugMsg( errorString );
imp_->file.close();
setError( tr( "%1 for file %2" ).arg( errorString ).arg( imp_->file.fileName() ) );
return false;
}
imp_->file.close();
QgsDebugMsg( "Opened document " + imp_->file.fileName() );
QgsDebugMsg( "Project title: " + imp_->title );
// get project version string, if any
QgsProjectVersion fileVersion = _getVersion( *doc );
QgsProjectVersion thisVersion( QGis::QGIS_VERSION );
if ( thisVersion > fileVersion )
{
QgsLogger::warning( "Loading a file that was saved with an older "
"version of qgis (saved in " + fileVersion.text() +
", loaded in " + QGis::QGIS_VERSION +
"). Problems may occur." );
QgsProjectFileTransform projectFile( *doc, fileVersion );
//! Shows a warning when an old project file is read.
emit oldProjectVersionWarning( fileVersion.text() );
QgsDebugMsg( "Emitting oldProjectVersionWarning(oldVersion)." );
projectFile.dump();
projectFile.updateRevision( thisVersion );
projectFile.dump();
}
// before we start loading everything, let's clear out the current set of
// properties first so that we don't have the properties from the previous
// project still hanging around
imp_->clear();
// now get any properties
_getProperties( *doc, imp_->properties_ );
QgsDebugMsg( QString::number( imp_->properties_.count() ) + " properties read" );
dump_( imp_->properties_ );
// restore the canvas' area of interest
// now get project title
_getTitle( *doc, imp_->title );
// get the map layers
QPair< bool, QList<QDomNode> > getMapLayersResults = _getMapLayers( *doc );
// review the integrity of the retrieved map layers
if ( ! getMapLayersResults.first )
{
QgsDebugMsg( "Unable to get map layers from project file." );
if ( ! getMapLayersResults.second.isEmpty() )
{
QgsDebugMsg( "there are " + QString::number( getMapLayersResults.second.size() ) + " broken layers" );
}
// we let a custom handler to decide what to do with missing layers
// (default implementation ignores them, there's also a GUI handler that lets user choose correct path)
mBadLayerHandler->handleBadLayers( getMapLayersResults.second, *doc );
}
// read the project: used by map canvas and legend
emit readProject( *doc );
// can't be dirty since we're allegedly in pristine state
dirty( false );
return true;
} // QgsProject::read
bool QgsProject::read( QDomNode & layerNode )
{
QString type = layerNode.toElement().attribute( "type" );
QgsMapLayer *mapLayer = NULL;
if ( type == "vector" )
{
mapLayer = new QgsVectorLayer;
}
else if ( type == "raster" )
{
mapLayer = new QgsRasterLayer;
}
else if ( type == "plugin" )
{
QString typeName = layerNode.toElement().attribute( "name" );
mapLayer = QgsPluginLayerRegistry::instance()->createLayer( typeName );
}
else
{
QgsDebugMsg( "bad layer type" );
return false;
}
if ( !mapLayer )
{
QgsDebugMsg( "unable to create layer" );
return false;
}
// have the layer restore state that is stored in Dom node
if ( mapLayer->readXML( layerNode ) )
{
mapLayer = QgsMapLayerRegistry::instance()->addMapLayer( mapLayer );
}
else
{
delete mapLayer;
QgsDebugMsg( "unable to load " + type + " layer" );
return false;
}
return true;
} // QgsProject::read( QDomNode & layerNode )
bool QgsProject::write( QFileInfo const &file )
{
imp_->file.setFileName( file.filePath() );
return write();
} // QgsProject::write( QFileInfo const & file )
bool QgsProject::write()
{
clearError();
// if we have problems creating or otherwise writing to the project file,
// let's find out up front before we go through all the hand-waving
// necessary to create all the Dom objects
if ( !imp_->file.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate ) )
{
imp_->file.close(); // even though we got an error, let's make
// sure it's closed anyway
setError( tr( "Unable to save to file %1" ).arg( imp_->file.fileName() ) );
return false;
}
QFileInfo myFileInfo( imp_->file );
if ( !myFileInfo.isWritable() )
{
// even though we got an error, let's make
// sure it's closed anyway
imp_->file.close();
setError( tr( "%1 is not writeable. Please adjust permissions (if possible) and try again." )
.arg( imp_->file.fileName() ) );
return false;
}
QDomImplementation DomImplementation;
QDomDocumentType documentType =
DomImplementation.createDocumentType( "qgis", "http://mrcc.com/qgis.dtd",
"SYSTEM" );
std::auto_ptr < QDomDocument > doc =
std::auto_ptr < QDomDocument > ( new QDomDocument( documentType ) );
QDomElement qgisNode = doc->createElement( "qgis" );
qgisNode.setAttribute( "projectname", title() );
qgisNode.setAttribute( "version", QString( "%1" ).arg( QGis::QGIS_VERSION ) );
doc->appendChild( qgisNode );
// title
QDomElement titleNode = doc->createElement( "title" );
qgisNode.appendChild( titleNode );
QDomText titleText = doc->createTextNode( title() ); // XXX why have title TWICE?
titleNode.appendChild( titleText );
// let map canvas and legend write their information
emit writeProject( *doc );