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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtAddOn.JsonDb module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QDebug>
#include <QString>
#include "jsondbstrings.h"
#include "jsondbindexquery.h"
#include "jsondbpartition.h"
#include "jsondbpartition_p.h"
#include "jsondbquery.h"
#include "jsondbsettings.h"
#include "jsondbutils_p.h"
QT_BEGIN_NAMESPACE_JSONDB_PARTITION
JsonDbQueryTerm::JsonDbQueryTerm()
: mValue(QJsonValue::Undefined)
{
}
JsonDbQueryTerm::~JsonDbQueryTerm()
{
}
QJsonValue JsonDbQueryTerm::value() const
{
Q_ASSERT(mVariable.isEmpty());
return mValue;
}
// JsonDbOrQueryTerm
JsonDbOrQueryTerm::JsonDbOrQueryTerm()
{
}
JsonDbOrQueryTerm::JsonDbOrQueryTerm(const JsonDbQueryTerm &term)
{
mTerms.append(term);
}
JsonDbOrQueryTerm::~JsonDbOrQueryTerm()
{
}
QList<QString> JsonDbOrQueryTerm::propertyNames() const
{
QList<QString> propertyNames;
foreach (const JsonDbQueryTerm &term, mTerms) {
QString propertyName = term.propertyName();
if (!propertyNames.contains(propertyName))
propertyNames.append(propertyName);
}
return propertyNames;
}
QList<QString> JsonDbOrQueryTerm::findUnindexablePropertyNames() const
{
QList<QString> unindexablePropertyNames;
QString firstPropertyName;
if (!mTerms.isEmpty())
firstPropertyName = mTerms[0].propertyName();
foreach (const JsonDbQueryTerm &term, mTerms) {
const QString propertyName = term.propertyName();
const QString op = term.op();
// notExists is unindexable because there would be no value to index
// contains and notContains are unindexable because JsonDbIndex does not support array values
if ((op == QLatin1String("notExists")
|| op == QLatin1String("contains")
|| op == QLatin1String("notContains"))
&& !unindexablePropertyNames.contains(propertyName))
unindexablePropertyNames.append(propertyName);
// if multiple properties are access in an disjunction ("|") then we cannot use an index on it
if (propertyName != firstPropertyName)
unindexablePropertyNames.append(propertyName);
}
return unindexablePropertyNames;
}
// JsonDbQuery
JsonDbQuery::JsonDbQuery()
{
}
JsonDbQuery::~JsonDbQuery()
{
}
bool JsonDbQuery::match(const JsonDbObject &object, QHash<QString, JsonDbObject> *objectCache, JsonDbPartition *partition) const
{
for (int i = 0; i < queryTerms.size(); i++) {
const JsonDbOrQueryTerm &orQueryTerm = queryTerms[i];
bool matches = false;
foreach (const JsonDbQueryTerm &term, orQueryTerm.terms()) {
const QString &joinPropertyName = term.joinField();
const QString &op = term.op();
QJsonValue value = termValue(term);
QJsonValue objectFieldValue;
if (!joinPropertyName.isEmpty()) {
JsonDbObject joinedObject = object;
const QVector<QStringList> &joinPaths = term.joinPaths();
for (int j = 0; j < joinPaths.size(); j++) {
if (!joinPaths[j].size()) {
if (jsondbSettings->debug())
qDebug() << term.joinField() << term.joinPaths();
}
QString uuidValue = joinedObject.valueByPath(joinPaths[j]).toString();
if (objectCache && objectCache->contains(uuidValue))
joinedObject = objectCache->value(uuidValue);
else if (partition) {
ObjectKey objectKey(uuidValue);
partition->d_func()->getObject(objectKey, joinedObject);
if (objectCache) objectCache->insert(uuidValue, joinedObject);
}
}
objectFieldValue = joinedObject.valueByPath(term.propertyName());
} else {
if (!term.hasPropertyName())
objectFieldValue = bindings.value(term.propertyVariable());
else
objectFieldValue = object.valueByPath(term.propertyName());
}
if (op == QLatin1Char('=') || op == QLatin1String("==")) {
matches = (objectFieldValue == value);
} else if (op == QLatin1String("<>") || op == QLatin1String("!=")) {
matches = (objectFieldValue != value);
} else if (op == QLatin1String("=~")) {
QRegExp rx = term.regExpConst();
if (jsondbSettings->debug())
qDebug() << "=~" << objectFieldValue.toString() << rx.exactMatch(objectFieldValue.toString());
matches = rx.exactMatch(objectFieldValue.toString());
} else if (op == QLatin1String("!=~")) {
QRegExp rx = term.regExpConst();
if (jsondbSettings->debug())
qDebug() << "!=~" << objectFieldValue.toString() << rx.exactMatch(objectFieldValue.toString());
matches = !rx.exactMatch(objectFieldValue.toString());
} else if (op == QLatin1String("<=")) {
matches = JsonDbIndexQuery::lessThan(objectFieldValue, value) || (objectFieldValue == value);
} else if (op == QLatin1Char('<')) {
matches = JsonDbIndexQuery::lessThan(objectFieldValue, value);
} else if (op == QLatin1String(">=")) {
matches = JsonDbIndexQuery::greaterThan(objectFieldValue, value) || (objectFieldValue == value);
} else if (op == QLatin1Char('>')) {
matches = JsonDbIndexQuery::greaterThan(objectFieldValue, value);
} else if (op == QLatin1String("exists")) {
matches = (objectFieldValue.type() != QJsonValue::Undefined);
} else if (op == QLatin1String("notExists")) {
matches = (objectFieldValue.type() == QJsonValue::Undefined);
} else if (op == QLatin1String("in")) {
if (0) qDebug() << __FUNCTION__ << __LINE__ << objectFieldValue << "in" << value
<< value.toArray().contains(objectFieldValue);
matches = value.toArray().contains(objectFieldValue);
} else if (op == QLatin1String("notIn")) {
if (0) qDebug() << __FUNCTION__ << __LINE__ << objectFieldValue << "notIn" << value
<< !value.toArray().contains(objectFieldValue);
matches = !value.toArray().contains(objectFieldValue);
} else if (op == QLatin1String("contains")) {
if (0) qDebug() << __FUNCTION__ << __LINE__ << objectFieldValue << "contains" << value
<< objectFieldValue.toArray().contains(value);
matches = objectFieldValue.toArray().contains(value);
} else if (op == QLatin1String("notContains")) {
if (0) qDebug() << __FUNCTION__ << __LINE__ << objectFieldValue << "notContains" << value
<< !objectFieldValue.toArray().contains(value);
matches = !objectFieldValue.toArray().contains(value);
} else if (op == QLatin1String("startsWith")) {
matches = (objectFieldValue.type() == QJsonValue::String
&& objectFieldValue.toString().startsWith(value.toString()));
} else {
qCritical() << "match" << "unhandled term" << term.propertyName() << term.op() << term.value() << term.joinField();
}
// if any of the OR query terms match, we continue to the next AND query term
if (matches)
break;
}
// if any of the AND query terms fail, it's not a match
if (!matches)
return false;
}
return true;
}
bool JsonDbQuery::isAscending() const
{
return orderTerms.isEmpty() || orderTerms.at(0).ascending;
}
QT_END_NAMESPACE_JSONDB_PARTITION
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