EmptyResource (Apache Tomcat 10.1.57 API Documentation)
Description: declaration: package: org.apache.catalina.webresources, class: EmptyResource

# Class EmptyResource

java.lang.Object
org.apache.catalina.webresources.EmptyResource

All Implemented Interfaces:
  `WebResource`

Direct Known Subclasses:
  `VirtualResource`

public class EmptyResource extends Object implements WebResource
A `WebResource` implementation that represents a non-existent resource. All methods return values indicating the resource does not exist.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `EmptyResource(WebResourceRoot root, String webAppPath)`
  Creates a new empty resource for the given path.
  `EmptyResource(WebResourceRoot root, String webAppPath, File file)`
  Creates a new empty resource for the given path and file.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `canRead()`
  Checks if this resource can be read.
  `boolean`
  `delete()`
  Deletes this resource.
  `boolean`
  `exists()`
  Checks if this resource exists.
  `String`
  `getCanonicalPath()`
  Returns the canonical path of this resource.
  `Certificate[]`
  `getCertificates()`
  Returns the certificates that were used to sign this resource to verify it.
  `URL`
  `getCodeBase()`
  `byte[]`
  `getContent()`
  Returns the binary content of this resource.
  `long`
  `getContentLength()`
  Returns the content length of this resource.
  `long`
  `getCreation()`
  Returns the creation time of this resource.
  `String`
  `getETag()`
  Returns the weak ETag calculated from the content length and last modified.
  `InputStream`
  `getInputStream()`
  Obtains an InputStream based on the contents of this resource.
  `long`
  `getLastModified()`
  Returns the last modified time.
  `String`
  `getLastModifiedHttp()`
  Returns the last modified time in HTTP format.
  `Manifest`
  `getManifest()`
  Returns the manifest associated with this resource.
  `String`
  `getMimeType()`
  Returns the MIME type for this Resource.
  `String`
  `getName()`
  Returns the name of this resource.
  `URL`
  `getURL()`
  Returns a URL to access this resource.
  `String`
  `getWebappPath()`
  Returns the webapp path of this resource.
  `WebResourceRoot`
  `getWebResourceRoot()`
  Returns a reference to the WebResourceRoot of which this WebResource is a part.
  `boolean`
  `isDirectory()`
  Checks if this resource is a directory.
  `boolean`
  `isFile()`
  Checks if this resource is a file.
  `boolean`
  `isVirtual()`
  Indicates if this resource is required for applications to correctly scan the file structure but that does not exist in either the main or any additional `WebResourceSet`.
  `void`
  `setMimeType(String mimeType)`
  Set the MIME type for this Resource.

  ### Methods inherited from class Object

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

  ### Methods inherited from interface WebResource

  `getStrongETag`

- ## Constructor Details

  - ### EmptyResource

    public EmptyResource(WebResourceRoot root, String webAppPath)
    Creates a new empty resource for the given path.
    Parameters:
      `root` - the web resource root
      `webAppPath` - the path within the web application

  - ### EmptyResource

    public EmptyResource(WebResourceRoot root, String webAppPath, File file)
    Creates a new empty resource for the given path and file.
    Parameters:
      `root` - the web resource root
      `webAppPath` - the path within the web application
      `file` - the associated file, may be `null`

- ## Method Details

  - ### getLastModified

    public long getLastModified()
    Description copied from interface: `WebResource`
    Returns the last modified time.
    Specified by:
      `getLastModified` in interface `WebResource`
    Returns:
      `File.lastModified()`.

  - ### getLastModifiedHttp

    public String getLastModifiedHttp()
    Description copied from interface: `WebResource`
    Returns the last modified time in HTTP format.
    Specified by:
      `getLastModifiedHttp` in interface `WebResource`
    Returns:
      the last modified time of this resource in the correct format for the HTTP Last-Modified header as specified by RFC 2616.

  - ### exists

    public boolean exists()
    Description copied from interface: `WebResource`
    Checks if this resource exists.
    Specified by:
      `exists` in interface `WebResource`
    Returns:
      `File.exists()`.

  - ### isVirtual

    public boolean isVirtual()
    Description copied from interface: `WebResource`
    Indicates if this resource is required for applications to correctly scan the file structure but that does not exist in either the main or any additional `WebResourceSet`. For example, if an external directory is mapped to /WEB-INF/lib in an otherwise empty web application, /WEB-INF will be represented as a virtual resource.
    Specified by:
      `isVirtual` in interface `WebResource`
    Returns:
      `true` for a virtual resource

  - ### isDirectory

    public boolean isDirectory()
    Description copied from interface: `WebResource`
    Checks if this resource is a directory.
    Specified by:
      `isDirectory` in interface `WebResource`
    Returns:
      `File.isDirectory()`.

  - ### isFile

    public boolean isFile()
    Description copied from interface: `WebResource`
    Checks if this resource is a file.
    Specified by:
      `isFile` in interface `WebResource`
    Returns:
      `File.isFile()`.

  - ### delete

    public boolean delete()
    Description copied from interface: `WebResource`
    Deletes this resource.
    Specified by:
      `delete` in interface `WebResource`
    Returns:
      `File.delete()`.

  - ### getName

    public String getName()
    Description copied from interface: `WebResource`
    Returns the name of this resource.
    Specified by:
      `getName` in interface `WebResource`
    Returns:
      `File.getName()`.

  - ### getContentLength

    public long getContentLength()
    Description copied from interface: `WebResource`
    Returns the content length of this resource.
    Specified by:
      `getContentLength` in interface `WebResource`
    Returns:
      `File.length()`.

  - ### getCanonicalPath

    public String getCanonicalPath()
    Description copied from interface: `WebResource`
    Returns the canonical path of this resource.
    Specified by:
      `getCanonicalPath` in interface `WebResource`
    Returns:
      `File.getCanonicalPath()`.

  - ### canRead

    public boolean canRead()
    Description copied from interface: `WebResource`
    Checks if this resource can be read.
    Specified by:
      `canRead` in interface `WebResource`
    Returns:
      `File.canRead()`.

  - ### getWebappPath

    public String getWebappPath()
    Description copied from interface: `WebResource`
    Returns the webapp path of this resource.
    Specified by:
      `getWebappPath` in interface `WebResource`
    Returns:
      The path of this resource relative to the web application root. If the resource is a directory, the return value will end in '/'.

  - ### getETag

    public String getETag()
    Description copied from interface: `WebResource`
    Returns the weak ETag calculated from the content length and last modified.
    Specified by:
      `getETag` in interface `WebResource`
    Returns:
      The ETag for this resource

  - ### setMimeType

    public void setMimeType(String mimeType)
    Description copied from interface: `WebResource`
    Set the MIME type for this Resource.
    Specified by:
      `setMimeType` in interface `WebResource`
    Parameters:
      `mimeType` - The mime type that will be associated with the resource

  - ### getMimeType

    public String getMimeType()
    Description copied from interface: `WebResource`
    Returns the MIME type for this Resource.
    Specified by:
      `getMimeType` in interface `WebResource`
    Returns:
      the MIME type for this Resource.

  - ### getInputStream

    public InputStream getInputStream()
    Description copied from interface: `WebResource`
    Obtains an InputStream based on the contents of this resource.
    Specified by:
      `getInputStream` in interface `WebResource`
    Returns:
      An InputStream based on the contents of this resource or `null` if the resource does not exist or does not represent a file

  - ### getContent

    public byte[] getContent()
    Description copied from interface: `WebResource`
    Returns the binary content of this resource.
    Specified by:
      `getContent` in interface `WebResource`
    Returns:
      the binary content of this resource or `null` if it is not available in a byte[] because, for example, it is too big.

  - ### getCreation

    public long getCreation()
    Description copied from interface: `WebResource`
    Returns the creation time of this resource.
    Specified by:
      `getCreation` in interface `WebResource`
    Returns:
      The time the file was created. If not available, the result of `WebResource.getLastModified()` will be returned.

  - ### getURL

    public URL getURL()
    Description copied from interface: `WebResource`
    Returns a URL to access this resource.
    Specified by:
      `getURL` in interface `WebResource`
    Returns:
      a URL to access the resource or `null` if no such URL is available or if the resource does not exist.

  - ### getCodeBase

    public URL getCodeBase()
    Specified by:
      `getCodeBase` in interface `WebResource`
    Returns:
      the code base for this resource that will be used when looking up the assigned permissions for the code base in the security policy file when running under a security manager.

  - ### getCertificates

    public Certificate[] getCertificates()
    Description copied from interface: `WebResource`
    Returns the certificates that were used to sign this resource to verify it.
    Specified by:
      `getCertificates` in interface `WebResource`
    Returns:
      the certificates that were used to sign this resource to verify it or @null if none.
    See Also:
      - `JarEntry.getCertificates()`

  - ### getManifest

    public Manifest getManifest()
    Description copied from interface: `WebResource`
    Returns the manifest associated with this resource.
    Specified by:
      `getManifest` in interface `WebResource`
    Returns:
      the manifest associated with this resource or @null if none.
    See Also:
      - `JarFile.getManifest()`

  - ### getWebResourceRoot

    public WebResourceRoot getWebResourceRoot()
    Description copied from interface: `WebResource`
    Returns a reference to the WebResourceRoot of which this WebResource is a part.
    Specified by:
      `getWebResourceRoot` in interface `WebResource`
    Returns:
      a reference to the WebResourceRoot of which this WebResource is a part.