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package moe.nea.modernjava.launch.relaunch;
import moe.nea.modernjava.launch.util.PropertyNames;
import moe.nea.modernjava.launch.util.TextIoUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.SystemUtils;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class JavaScanner {
public static final String JAVA_BINARY_PATH = "bin/java" + (SystemUtils.IS_OS_WINDOWS ? ".exe" : "");
public static final String JAVA_COMPILER_PATH = "bin/javac" + (SystemUtils.IS_OS_WINDOWS ? ".exe" : "");
public boolean isJavaHome(File potential) {
if (new File(potential, JAVA_BINARY_PATH).exists()) {
return true;
}
return false;
}
private List<LocalJavaVersion> versionList = new ArrayList<>();
public void scanDirectory(File file) {
scanDirectory(file, 1);
}
public void scanDirectory(File file, int depthLimit) {
if (depthLimit < 0) return;
if (isJavaHome(file)) {
versionList.add(new LocalJavaVersion(file));
} else {
for (File listFile : file.listFiles()) {
if (listFile.isDirectory()) {
scanDirectory(listFile, depthLimit - 1);
}
}
}
}
public void prettyPrint() {
String s = "Fun fact these are the found Java Runtime Environments:\n";
for (LocalJavaVersion localJavaVersion : versionList) {
s += localJavaVersion.prettyPrint();
}
System.out.println(s);
}
public void scanDefaultPaths() {
File home = new File(System.getProperty("user.home"));
scanDirectory(new File(home, ".sdkman/candidates/java"));
scanDirectory(new File(home, ".jdks"));
scanDirectory(new File("/usr"), 0);
String[] paths = System.getProperty(PropertyNames.JAVA_SCAN_PATH, "").split(File.pathSeparator);
for (String path : paths) {
if (!path.isEmpty()) {
scanDirectory(new File(path).getParentFile(), 3);
}
}
}
public LocalJavaVersion findCandidate() {
LocalJavaVersion bestFit = null;
for (LocalJavaVersion localJavaVersion : versionList) {
if (localJavaVersion.isJdk() && localJavaVersion.getMajorVersion() == 16) {
bestFit = localJavaVersion;
}
}
return bestFit;
}
public static class LocalJavaVersion {
private final File javaHome;
private String versionString;
public LocalJavaVersion(File javaHome) {
this.javaHome = javaHome;
}
public File getJavaHome() {
return javaHome;
}
public File getJavaBinary() {
return new File(javaHome, JAVA_BINARY_PATH);
}
public boolean isJdk() {
return new File(javaHome, JAVA_COMPILER_PATH).exists();
}
public String getVersionString() {
if (versionString == null) {
ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.command(getJavaBinary().getAbsolutePath(), "-version");
processBuilder.redirectInput(ProcessBuilder.Redirect.PIPE);
processBuilder.redirectOutput(ProcessBuilder.Redirect.PIPE);
processBuilder.redirectError(ProcessBuilder.Redirect.PIPE);
try {
Process process = processBuilder.start();
process.waitFor();
versionString = IOUtils.toString(process.getInputStream()) + IOUtils.toString(process.getErrorStream());
} catch (Exception e) {
e.printStackTrace();
versionString = "<invalid>";
}
}
return versionString;
}
public String prettyPrint() {
return javaHome.getAbsolutePath() + ":\n"
+ "\tJava Binary: " + getJavaBinary().getAbsolutePath() + "\n"
+ "\tMajor Version: " + getMajorVersion() + "\n"
+ "\tFull Version: " + getVersion() + "\n"
+ "\tIs Jdk: " + isJdk() + "\n"
;
}
public String getVersion() {
String v = getVersionString();
String[] s = v.split("\"");
if (s.length < 2) return null;
return s[1];
}
public int getMajorVersion() {
try {
return Integer.parseInt(getVersion().split("\\.")[0]);
} catch (Exception e) {
return -1;
}
}
}
}
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