private int getVersionFromJavaHome(File javaHome) {
        JvmInstallationMetadata metadata = validate(detector.getMetadata(InstallationLocation.autoDetected(javaHome, "specific path")));
        return JavaVersionParser.parseMajorVersion(metadata.getJavaVersion());
    }

    private JvmInstallationMetadata validate(JvmInstallationMetadata metadata) {
        if(metadata.isValidInstallation()) {
            return metadata;
        }

/**
 * Shared code between {@link org.gradle.api.JavaVersion} and other code for parsing a full
 * Java version string.
 */
@NonNullApi
public class JavaVersionParser {

    public static int parseMajorVersion(String fullVersion) {
        int firstNonVersionCharIndex = findFirstNonVersionCharIndex(fullVersion);

        String[] versionStrings = fullVersion.substring(0, firstNonVersionCharIndex).split("\\.");

        } else {
            return new DefaultJavaLanguageVersion(version);
        }
    }

    public static JavaLanguageVersion fromFullVersion(String version) {
        return of(JavaVersionParser.parseMajorVersion(version));
    }

    private final int version;

    private DefaultJavaLanguageVersion(int version) {
        this.version = version;
    }

    @Override
    public int asInt() {

        def jdkDir = software.file(jdkDirName)

        and:
        _ * os.windows >> true

        when:
        def jvm = new Jvm(os, jreDir, version, JavaVersionParser.parseMajorVersion(version))

        then:
        jvm.javaHome == jdkDir
        jvm.jdk
        jvm.toolsJar == jdkDir.file("lib/tools.jar")
        jvm.javaExecutable == jdkDir.file('bin/java.exe')

        }
        if (value instanceof Integer) {
            return getVersionForMajor((Integer) value);
        }

        String name = value.toString();
        return getVersionForMajor(JavaVersionParser.parseMajorVersion(name));
    }

    /**
     * Returns the version of the current JVM.
     *
     * @return The version of the current JVM.
     */
    public static JavaVersion current() {

     */
    Jvm(OperatingSystem os) {
        this(os, FileUtils.canonicalize(new File(System.getProperty("java.home"))), System.getProperty("java.version"), JavaVersionParser.parseMajorVersion(System.getProperty("java.version")), false);
    }

    /**
     * Constructs JVM details from the given values
     */