Package org.apache.catalina.webresources

Class CachedResource

java.lang.Object

org.apache.catalina.webresources.CachedResource

All Implemented Interfaces:

WebResource

public class CachedResource
extends Object
implements WebResource

This class is designed to wrap a 'raw' WebResource and providing caching for expensive operations. Inexpensive operations may be passed through to the underlying resource.

Constructor Summary

Constructors

Constructor	Description
CachedResource(Cache cache, StandardRoot root, String path, long ttl, int objectMaxSizeBytes, boolean usesClassLoaderResources)

Method Summary

Modifier and Type	Method	Description
boolean	canRead()
boolean	delete()
boolean	exists()
String	getCanonicalPath()
Certificate[]	getCertificates()
byte[]	getContent()
long	getContentLength()
long	getCreation()
String	getETag()	Return the strong ETag if available (currently not supported) else return the weak ETag calculated from the content length and last modified.
InputStream	getInputStream()	Obtain an InputStream based on the contents of this resource.
long	getLastModified()
String	getLastModifiedHttp()
Manifest	getManifest()
String	getMimeType()
String	getName()
protected long	getNextCheck()
URL	getURL()
String	getWebappPath()
WebResourceRoot	getWebResourceRoot()
boolean	isDirectory()
boolean	isFile()
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.
protected boolean	validateResource(boolean useClassLoaderResources)
protected boolean	validateResources(boolean useClassLoaderResources)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.catalina.WebResource

getCodeBase

Constructor Details

CachedResource

public CachedResource(Cache cache,
 StandardRoot root,
 String path,
 long ttl,
 int objectMaxSizeBytes,
 boolean usesClassLoaderResources)

Method Details

validateResource

protected boolean validateResource(boolean useClassLoaderResources)

validateResources

protected boolean validateResources(boolean useClassLoaderResources)

getNextCheck

protected long getNextCheck()

getLastModified

public long getLastModified()

Specified by:

getLastModified in interface WebResource

Returns:

File.lastModified().

getLastModifiedHttp

public String getLastModifiedHttp()

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()

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()

Specified by:

isDirectory in interface WebResource

Returns:

File.isDirectory().

isFile

public boolean isFile()

Specified by:

isFile in interface WebResource

Returns:

File.isFile().

delete

public boolean delete()

Specified by:

delete in interface WebResource

Returns:

File.delete().

getName

public String getName()

Specified by:

getName in interface WebResource

Returns:

File.getName().

getContentLength

public long getContentLength()

Specified by:

getContentLength in interface WebResource

Returns:

File.length().

getCanonicalPath

public String getCanonicalPath()

Specified by:

getCanonicalPath in interface WebResource

Returns:

File.getCanonicalPath().

canRead

public boolean canRead()

Specified by:

canRead in interface WebResource

Returns:

File.canRead().

getWebappPath

public String getWebappPath()

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

Return the strong ETag if available (currently not supported) else return 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()

Specified by:

getMimeType in interface WebResource

Returns:

the MIME type for this Resource.

getInputStream

public InputStream getInputStream()

Description copied from interface: WebResource

Obtain 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()

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()

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()

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.

getCertificates

public Certificate[] getCertificates()

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()

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()

Specified by:

getWebResourceRoot in interface WebResource

Returns:

a reference to the WebResourceRoot of which this WebResource is a part.