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/* Copyright 2013 MultiMC Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "JavaUtils.h"
#include "osutils.h"
#include "pathutils.h"
#include <QStringList>
#include <QString>
#include <QDir>
#include <QDebug>
#if WINDOWS
#include <windows.h>
#endif
JavaUtils::JavaUtils()
{
}
#if WINDOWS
QStringList JavaUtils::FindJavaPath()
{
QStringList paths;
HKEY jreKey;
QString jreKeyName = "SOFTWARE\\JavaSoft\\Java Runtime Environment";
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, jreKeyName.toStdString().c_str(), 0, KEY_READ | KEY_WOW64_64KEY, &jreKey) == ERROR_SUCCESS)
{
// Read the current JRE version from the registry.
// This will be used to find the key that contains the JavaHome value.
char *value = new char[0];
DWORD valueSz = 0;
if (RegQueryValueExA(jreKey, "CurrentVersion", NULL, NULL, (BYTE*)value, &valueSz) == ERROR_MORE_DATA)
{
value = new char[valueSz];
RegQueryValueExA(jreKey, "CurrentVersion", NULL, NULL, (BYTE*)value, &valueSz);
}
RegCloseKey(jreKey);
// Now open the registry key for the JRE version that we just got.
jreKeyName.append("\\").append(value);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, jreKeyName.toStdString().c_str(), 0, KEY_READ | KEY_WOW64_64KEY, &jreKey) == ERROR_SUCCESS)
{
// Read the JavaHome value to find where Java is installed.
value = new char[0];
valueSz = 0;
if (RegQueryValueExA(jreKey, "JavaHome", NULL, NULL, (BYTE*)value, &valueSz) == ERROR_MORE_DATA)
{
value = new char[valueSz];
RegQueryValueExA(jreKey, "JavaHome", NULL, NULL, (BYTE*)value, &valueSz);
paths << QDir(PathCombine(value, "bin")).absoluteFilePath("java.exe");
}
RegCloseKey(jreKey);
}
}
if(paths.length() <= 0)
{
qWarning() << "Failed to find Java in the Windows registry - defaulting to \"java\"";
paths << "java";
}
return paths;
}
#elif OSX
QStringList JavaUtils::FindJavaPath()
{
qWarning() << "OS X Java detection incomplete - defaulting to \"java\"";
QStringList paths;
paths << "java";
return paths;
}
#elif LINUX
QStringList JavaUtils::FindJavaPath()
{
qWarning() << "Linux Java detection incomplete - defaulting to \"java\"";
QStringList paths;
paths << "java";
return paths;
}
#else
QStringList JavaUtils::FindJavaPath()
{
qWarning() << "Unknown operating system build - defaulting to \"java\"";
QStringList paths;
paths << "java";
return paths;
}
#endif
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