1 files changed, 138 insertions, 0 deletions
diff --git a/meshmc/launcher/JavaCommon.cpp b/meshmc/launcher/JavaCommon.cpp
new file mode 100644
index 0000000000..4d208f7545
--- /dev/null
+++ b/meshmc/launcher/JavaCommon.cpp
@@ -0,0 +1,138 @@
+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   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 3 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "JavaCommon.h"
+#include "ui/dialogs/CustomMessageBox.h"
+#include <MMCStrings.h>
+#include <QRegularExpression>
+
+bool JavaCommon::checkJVMArgs(QString jvmargs, QWidget* parent)
+{
+	if (jvmargs.contains("-XX:PermSize=") ||
+		jvmargs.contains(QRegularExpression("-Xm[sx]")) ||
+		jvmargs.contains("-XX-MaxHeapSize") ||
+		jvmargs.contains("-XX:InitialHeapSize")) {
+		auto warnStr =
+			QObject::tr("You tried to manually set a JVM memory option (using "
+						"\"-XX:PermSize\", \"-XX-MaxHeapSize\", "
+						"\"-XX:InitialHeapSize\",  \"-Xmx\" or \"-Xms\").\n"
+						"There are dedicated boxes for these in the settings "
+						"(Java tab, in the Memory group at the top).\n"
+						"This message will be displayed until you remove them "
+						"from the JVM arguments.");
+		CustomMessageBox::selectable(parent,
+									 QObject::tr("JVM arguments warning"),
+									 warnStr, QMessageBox::Warning)
+			->exec();
+		return false;
+	}
+	return true;
+}
+
+void JavaCommon::javaWasOk(QWidget* parent, JavaCheckResult result)
+{
+	QString text;
+	text +=
+		QObject::tr(
+			"Java test succeeded!<br />Platform reported: %1<br />Java version "
+			"reported: %2<br />Java vendor "
+			"reported: %3<br />")
+			.arg(result.realPlatform, result.javaVersion.toString(),
+				 result.javaVendor);
+	if (result.errorLog.size()) {
+		auto htmlError = result.errorLog;
+		htmlError.replace('\n', "<br />");
+		text +=
+			QObject::tr("<br />Warnings:<br /><font color=\"orange\">%1</font>")
+				.arg(htmlError);
+	}
+	CustomMessageBox::selectable(parent, QObject::tr("Java test success"), text,
+								 QMessageBox::Information)
+		->show();
+}
+
+void JavaCommon::javaArgsWereBad(QWidget* parent, JavaCheckResult result)
+{
+	auto htmlError = result.errorLog;
+	QString text;
+	htmlError.replace('\n', "<br />");
+	text += QObject::tr("The specified java binary didn't work with the "
+						"arguments you provided:<br />");
+	text += QString("<font color=\"red\">%1</font>").arg(htmlError);
+	CustomMessageBox::selectable(parent, QObject::tr("Java test failure"), text,
+								 QMessageBox::Warning)
+		->show();
+}
+
+void JavaCommon::javaBinaryWasBad(QWidget* parent, JavaCheckResult result)
+{
+	QString text;
+	text += QObject::tr("The specified java binary didn't work.<br />You "
+						"should use the auto-detect feature, "
+						"or set the path to the java executable.<br />");
+	CustomMessageBox::selectable(parent, QObject::tr("Java test failure"), text,
+								 QMessageBox::Warning)
+		->show();
+}
+
+void JavaCommon::TestCheck::run()
+{
+	if (!JavaCommon::checkJVMArgs(m_args, m_parent)) {
+		emit finished();
+		return;
+	}
+	checker.reset(new JavaChecker());
+	connect(checker.get(), SIGNAL(checkFinished(JavaCheckResult)), this,
+			SLOT(checkFinished(JavaCheckResult)));
+	checker->m_path = m_path;
+	checker->performCheck();
+}
+
+void JavaCommon::TestCheck::checkFinished(JavaCheckResult result)
+{
+	if (result.validity != JavaCheckResult::Validity::Valid) {
+		javaBinaryWasBad(m_parent, result);
+		emit finished();
+		return;
+	}
+	checker.reset(new JavaChecker());
+	connect(checker.get(), SIGNAL(checkFinished(JavaCheckResult)), this,
+			SLOT(checkFinishedWithArgs(JavaCheckResult)));
+	checker->m_path = m_path;
+	checker->m_args = m_args;
+	checker->m_minMem = m_minMem;
+	checker->m_maxMem = m_maxMem;
+	if (result.javaVersion.requiresPermGen()) {
+		checker->m_permGen = m_permGen;
+	}
+	checker->performCheck();
+}
+
+void JavaCommon::TestCheck::checkFinishedWithArgs(JavaCheckResult result)
+{
+	if (result.validity == JavaCheckResult::Validity::Valid) {
+		javaWasOk(m_parent, result);
+		emit finished();
+		return;
+	}
+	javaArgsWereBad(m_parent, result);
+	emit finished();
+}