io.github.lukehutch.fastclasspathscanner.utils

Class JarUtils

java.lang.Object

io.github.lukehutch.fastclasspathscanner.utils.JarUtils

public class JarUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
JarUtils()

Method Summary

Modifier and Type	Method and Description
static long	countBytesBeforePKMarker(File zipfile) Count the number of bytes before the characters "PK" in a zipfile.
static String	getRtJarPath() Get the path of rt.jar
static boolean	isJREJar(String filePath, LogNode log) Determine whether a given jarfile is in a JRE system directory (jre, jre/lib, jre/lib/ext, etc.).
static String	leafName(String path) Returns the leafname of a path, after first stripping off everything after the first '!', if present.
static void	logJavaInfo(LogNode log) Log the Java version and the JRE paths that were found.
static String	pathElementsToPathStr(Iterable<?> pathElts) Get a set of path elements as a string, from an array of objects (e.g.
static String	pathElementsToPathStr(Object... pathElts) Get a set of path elements as a string, from an array of objects (e.g.
static String[]	smartPathSplit(String pathStr) Split a path on File.pathSeparator (':' on Linux, ';' on Windows), but also allow for the use of URLs with protocol specifiers, e.g.
static void	stripSFXHeader(File srcZipfile, long sfxHeaderBytes, File destZipfile) Strip the self-extracting archive header from the beginning of a zipfile.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JarUtils

public JarUtils()

Method Detail

smartPathSplit

public static String[] smartPathSplit(String pathStr)

Split a path on File.pathSeparator (':' on Linux, ';' on Windows), but also allow for the use of URLs with protocol specifiers, e.g. "http://domain/jar1.jar:http://domain/jar2.jar". This is really not even handled by the JRE, in all likelihood, but it's better to be robust.

pathElementsToPathStr

public static String pathElementsToPathStr(Object... pathElts)

Get a set of path elements as a string, from an array of objects (e.g. of String, File or URL type, whose toString() method will be called to get the path component), and return the path as a single string delineated with the standard path separator character.

Returns:

the delimited path.

pathElementsToPathStr

public static String pathElementsToPathStr(Iterable<?> pathElts)

Get a set of path elements as a string, from an array of objects (e.g. of String, File or URL type, whose toString() method will be called to get the path component), and return the path as a single string delineated with the standard path separator character.

Returns:

the delimited path.

leafName

public static String leafName(String path)

Returns the leafname of a path, after first stripping off everything after the first '!', if present.

getRtJarPath

public static String getRtJarPath()

Get the path of rt.jar

isJREJar

public static boolean isJREJar(String filePath,
                               LogNode log)

Determine whether a given jarfile is in a JRE system directory (jre, jre/lib, jre/lib/ext, etc.).

countBytesBeforePKMarker

public static long countBytesBeforePKMarker(File zipfile)
                                     throws IOException

Count the number of bytes before the characters "PK" in a zipfile. Returns -1 if PK is not found anywhere in the file.

Throws:

IOException

stripSFXHeader

public static void stripSFXHeader(File srcZipfile,
                                  long sfxHeaderBytes,
                                  File destZipfile)
                           throws IOException

Strip the self-extracting archive header from the beginning of a zipfile.

Throws:

IOException

logJavaInfo

public static void logJavaInfo(LogNode log)

Log the Java version and the JRE paths that were found.