# Class StandardJarScanner

java.lang.Object
org.apache.tomcat.util.scan.StandardJarScanner

All Implemented Interfaces:
  `JarScanner`

public class StandardJarScanner extends Object implements JarScanner
The default `JarScanner` implementation scans the WEB-INF/lib directory followed by the provided classloader and then works up the classloader hierarchy. This implementation is sufficient to meet the requirements of the Servlet 3.0 specification as well as to provide a number of Tomcat specific extensions. The extensions are:

- Scanning the classloader hierarchy (enabled by default)
- Testing all files to see if they are JARs (disabled by default)
- Testing all directories to see if they are exploded JARs (disabled by default)

All of the extensions may be controlled via configuration.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `StandardJarScanner()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected void`
  `addClassPath(Deque<URL> classPathUrlsToProcess)`
  `protected void`
  `doScanClassPath(JarScanType scanType, ServletContext context, JarScannerCallback callback, Set<URL> processedURLs)`
  `JarScanFilter`
  `getJarScanFilter()`
  `boolean`
  `isScanAllDirectories()`
  `boolean`
  `isScanAllFiles()`
  `boolean`
  `isScanBootstrapClassPath()`
  `boolean`
  `isScanClassPath()`
  `boolean`
  `isScanManifest()`
  `protected void`
  `process(JarScanType scanType, JarScannerCallback callback, URL url, String webappPath, boolean isWebapp, Deque<URL> classPathUrlsToProcess)`
  `protected void`
  `processURLs(JarScanType scanType, JarScannerCallback callback, Set<URL> processedURLs, boolean isWebapp, Deque<URL> classPathUrlsToProcess)`
  `void`
  `scan(JarScanType scanType, ServletContext context, JarScannerCallback callback)`
  Scan the provided ServletContext and class loader for JAR files.
  `void`
  `setJarScanFilter(JarScanFilter jarScanFilter)`
  `void`
  `setScanAllDirectories(boolean scanAllDirectories)`
  `void`
  `setScanAllFiles(boolean scanAllFiles)`
  `void`
  `setScanBootstrapClassPath(boolean scanBootstrapClassPath)`
  `void`
  `setScanClassPath(boolean scanClassPath)`
  `void`
  `setScanManifest(boolean scanManifest)`

  ### Methods inherited from class java.lang.Object

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

- ## Constructor Details

  - ### StandardJarScanner

    public StandardJarScanner()

- ## Method Details

  - ### isScanClassPath

    public boolean isScanClassPath()

  - ### setScanClassPath

    public void setScanClassPath(boolean scanClassPath)

  - ### isScanManifest

    public boolean isScanManifest()

  - ### setScanManifest

    public void setScanManifest(boolean scanManifest)

  - ### isScanAllFiles

    public boolean isScanAllFiles()

  - ### setScanAllFiles

    public void setScanAllFiles(boolean scanAllFiles)

  - ### isScanAllDirectories

    public boolean isScanAllDirectories()

  - ### setScanAllDirectories

    public void setScanAllDirectories(boolean scanAllDirectories)

  - ### isScanBootstrapClassPath

    public boolean isScanBootstrapClassPath()

  - ### setScanBootstrapClassPath

    public void setScanBootstrapClassPath(boolean scanBootstrapClassPath)

  - ### getJarScanFilter

    public JarScanFilter getJarScanFilter()
    Specified by:
      `getJarScanFilter` in interface `JarScanner`

  - ### setJarScanFilter

    public void setJarScanFilter(JarScanFilter jarScanFilter)
    Specified by:
      `setJarScanFilter` in interface `JarScanner`

  - ### scan

    public void scan(JarScanType scanType, ServletContext context, JarScannerCallback callback)
    Scan the provided ServletContext and class loader for JAR files. Each JAR file found will be passed to the callback handler to be processed.
    Specified by:
      `scan` in interface `JarScanner`
    Parameters:
      `scanType` - The type of JAR scan to perform. This is passed to the filter which uses it to determine how to filter the results
      `context` - The ServletContext - used to locate and access WEB-INF/lib
      `callback` - The handler to process any JARs found

  - ### doScanClassPath

    protected void doScanClassPath(JarScanType scanType, ServletContext context, JarScannerCallback callback, Set<URL> processedURLs)

  - ### processURLs

    protected void processURLs(JarScanType scanType, JarScannerCallback callback, Set<URL> processedURLs, boolean isWebapp, Deque<URL> classPathUrlsToProcess)

  - ### addClassPath

    protected void addClassPath(Deque<URL> classPathUrlsToProcess)

  - ### process

    protected void process(JarScanType scanType, JarScannerCallback callback, URL url, String webappPath, boolean isWebapp, Deque<URL> classPathUrlsToProcess) throws IOException
    Throws:
      `IOException`