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koffice/kexi/plugins/macros/lib/context.cpp

262 lines
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/***************************************************************************
* This file is part of the KDE project
* copyright (C) 2005 by Sebastian Sauer (mail@dipe.org)
* copyright (C) 2005 by Tobi Krebs (tobi.krebs@gmail.com)
*
* 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 of the License, 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
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
***************************************************************************/
#include "context.h"
#include "action.h"
#include "macro.h"
#include "macroitem.h"
#include "exception.h"
//#include <tqtimer.h>
#include <kdebug.h>
using namespace KoMacro;
namespace KoMacro {
/**
* @internal d-pointer class to be more flexible on future extension of the
* functionality without to much risk to break the binary compatibility.
*/
class Context::Private
{
public:
/**
* The @a Macro instance that owns this @a Context .
*/
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TDESharedPtr<Macro> macro;
/**
* List of @a Action instances that are children of the
* macro.
*/
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TQValueList<TDESharedPtr<MacroItem > > items;
/**
* The currently selected @a MacroItem or NULL if there
* is now @a MacroItem selected yet.
*/
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TDESharedPtr<MacroItem> macroitem;
/**
* Map of all @a Variable instance that are defined within
* this context.
*/
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TQMap<TQString, TDESharedPtr<Variable > > variables;
/**
* The @a Exception instance thrown at the last @a activate()
* call or NULL if there was no exception thrown yet.
*/
Exception* exception;
/// Constructor.
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explicit Private(TDESharedPtr<Macro> m)
: macro(m) // remember the macro
, items(m->items()) // set d-pointer children to macro children
, exception(0) // no exception yet.
{
}
/// Destructor.
~Private()
{
delete exception;
}
};
}
//Constructor with initialization of our Private.object (d-pointer)
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Context::Context(TDESharedPtr<Macro> macro)
: TQObject()
, d( new Private(macro) ) // create the private d-pointer instance.
{
}
//Destructor.
Context::~Context()
{
delete d;
}
//return if we have (d-pointer) variables
bool Context::hasVariable(const TQString& name) const
{
//Use TQMap?s contains to check if a variable with name exists
return d->variables.contains(name);
}
//return variable with name or throw an exception if none is found in variables
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TDESharedPtr<Variable> Context::variable(const TQString& name) const
{
//Use TQMap?s contains to check if a variable with name exists in context
if (d->variables.contains(name)) {
//return it
return d->variables[name];
}
//if there is a macroitem try to get variable from it
if(d->macroitem.data()) {
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TDESharedPtr<Variable> v = d->macroitem->variable(name, true);
if(v.data()) {
return v;
}
}
//none found throw exception
throw Exception(TQString("Variable name='%1' does not exist.").arg(name));
}
//return a map of our (d-pointer) variables
Variable::Map Context::variables() const
{
return d->variables;
}
//set a variable
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void Context::setVariable(const TQString& name, TDESharedPtr<Variable> variable)
{
//debuging infos
kdDebug() << TQString("KoMacro::Context::setVariable name='%1' variable='%2'").arg(name).arg(variable->toString()) << endl;
//Use TQMap?s replace to set/replace the variable named name
d->variables.replace(name, variable);
}
//return the associated Macro
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TDESharedPtr<Macro> Context::macro() const
{
return d->macro;
}
//return the currently selected MacroItem
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TDESharedPtr<MacroItem> Context::macroItem() const
{
return d->macroitem;
}
//return if this context had an exception
bool Context::hadException() const
{
return d->exception != 0;
}
//return the (d-pointer) exception
Exception* Context::exception() const
{
return d->exception;
}
//try to activate all action?s in this context
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void Context::activate(TQValueList<TDESharedPtr<MacroItem > >::ConstIterator it)
{
//debuging infos
kdDebug() << "Context::activate()" << endl;
//TQ_ASSIGN(d->macro);
//set end to constEnd
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TQValueList<TDESharedPtr<MacroItem > >::ConstIterator end(d->items.constEnd());
//loop through actions
for(;it != end; ++it) {
// fetch the MacroItem we are currently pointing to.
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d->macroitem = TDESharedPtr<MacroItem>(*it);
//skip empty macroitems
if(! d->macroitem.data()) {
kdDebug() << "Context::activate() Skipping empty MacroItem" << endl;
continue;
}
// fetch the Action, the MacroItem points to.
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TDESharedPtr<Action> action = d->macroitem->action();
//skip macroitems without an action
if(! action.data()) {
kdDebug() << "Context::activate() Skipping MacroItem with no action" << endl;
continue;
}
try {
// activate the action
action->activate(this);
}
//catch exceptions
catch(Exception& e) {
//create a new exception from caugth one and set internal exception
d->exception = new Exception(e);
//add new tracemessages
//the macro name
d->exception->addTraceMessage( TQString("macro=%1").arg(d->macro->name()) );
//the action name
d->exception->addTraceMessage( TQString("action=%1").arg(action->name()) );
//and all variables wich belong to the action/macro
TQStringList variables = action->variableNames();
for(TQStringList::Iterator vit = variables.begin(); vit != variables.end(); ++vit) {
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TDESharedPtr<Variable> v = d->macroitem->variable(*vit, true);
d->exception->addTraceMessage( TQString("%1=%2").arg(*vit).arg(v->toString()) );
}
return; // abort execution
}
}
// The run is done. So, let's remove the currently selected item to
// outline, that we did the job and there stays no dangling item.
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d->macroitem = TDESharedPtr<MacroItem>(0);
}
//try to activated an context
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void Context::activate(TDESharedPtr<Context> context)
{
//setup context
delete d->exception; d->exception = 0;
if(context->hadException()) {
// if the context in which this context should run in already had an exception,
// we adopt this exception and abort the execution.
d->exception = new Exception( *context->exception() );
return;
}
// Merge the passed context into this context
Variable::Map variables = context->variables();
//copy variables
Variable::Map::ConstIterator it, end( variables.constEnd() );
for( it = variables.constBegin(); it != end; ++it)
setVariable(it.key(), it.data());
//activate copied context.
activate(d->items.constBegin());
}
//try to continue activation of a context
void Context::activateNext()
{
//setup/clear context,
//allows us to continue activation even when an exception happend before
delete d->exception; d->exception = 0;
if(! d->macroitem) { // if no MacroItem is defined, we don't need to try to continue execution
return;
}
//find the macroitem from which to continue
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TQValueList<TDESharedPtr<MacroItem > >::ConstIterator it = d->items.find(d->macroitem);
if (it != d->items.constEnd()) {
activate(++it); // try to continue the execution.
}
}
#include "context.moc"