org.opencms.loader
Class CmsDumpLoader

java.lang.Object
  org.opencms.loader.CmsDumpLoader

All Implemented Interfaces:

I_CmsConfigurationParameterHandler, I_CmsResourceLoader

Direct Known Subclasses:

CmsImageLoader, CmsPointerLoader

public class CmsDumpLoader
extends java.lang.Object
implements I_CmsResourceLoader

Dump loader for binary or other unprocessed resource types.

This loader is also used to deliver static sub-elements of pages processed by other loaders.

Since:

6.0.0

Version:

$Revision: 1.74 $

Author:

Alexander Kandzior

Field Summary

static int

RESOURCE_LOADER_ID The id of this loader.

Fields inherited from interface org.opencms.loader.I_CmsResourceLoader

PARAMETER_ELEMENT

Fields inherited from interface org.opencms.configuration.I_CmsConfigurationParameterHandler

ADD_PARAMETER_METHOD, INIT_CONFIGURATION_METHOD

Constructor Summary

CmsDumpLoader()
The constructor of the class is empty and does nothing.

Method Summary

void	addConfigurationParameter(java.lang.String paramName, java.lang.String paramValue) Adds a configuration parameter to this parameter configurable class instance.
protected boolean	canSendLastModifiedHeader(CmsResource resource, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Checks if the requested resource must be send to the client by checking the "If-Modified-Since" http header.
void	destroy() Destroy this ResourceLoder, this is a NOOP so far.
byte[]	dump(CmsObject cms, CmsResource resource, java.lang.String element, java.util.Locale locale, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Dumps the processed content of the the requested file (and it's sub-elements) to a byte array.
byte[]	export(CmsObject cms, CmsResource resource, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Static exports the contents of the requested file and it's sub-elements.
java.util.Map	getConfiguration() Will always return null since this loader does not need to be configured.
int	getLoaderId() Returns the id of the ResourceLoader.
java.lang.String	getResourceLoaderInfo() Return a String describing the ResourceLoader, which is (localized to the system default locale) "The OpenCms default resource loader for unprocessed files".
void	initConfiguration() Initializes a configuration after all parameters have been added.
boolean	isStaticExportEnabled() Signals if the loader implementation supports static export of resources.
boolean	isStaticExportProcessable() Signals if the loader implementation requires processing during static export of resources.
boolean	isUsableForTemplates() Signals if the loader implementation is usable for creating templates.
boolean	isUsingUriWhenLoadingTemplate() Signals if a loader that supports templates must be invoked on the template URI or the resource URI.
void	load(CmsObject cms, CmsResource resource, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Basic top-page processing method for a I_CmsResourceLoader, this method is called if the page is called as a sub-element on a page not already loaded with a I_CmsResourceLoader.
void	service(CmsObject cms, CmsResource resource, javax.servlet.ServletRequest req, javax.servlet.ServletResponse res) Does the job of including the requested resource, this method is called directly if the element is called as a sub-element from another I_CmsResourceLoader.

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE_LOADER_ID

public static final int RESOURCE_LOADER_ID

The id of this loader.

See Also:

Constant Field Values

Constructor Detail

CmsDumpLoader

public CmsDumpLoader()

The constructor of the class is empty and does nothing.

Method Detail

addConfigurationParameter

public void addConfigurationParameter(java.lang.String paramName,
                                      java.lang.String paramValue)

Description copied from interface: I_CmsConfigurationParameterHandler

Adds a configuration parameter to this parameter configurable class instance.

Specified by:

addConfigurationParameter in interface I_CmsConfigurationParameterHandler

Parameters:

paramName - the name of the parameter

paramValue - the value for the parameter

See Also:

I_CmsConfigurationParameterHandler.addConfigurationParameter(java.lang.String, java.lang.String)

destroy

public void destroy()

Destroy this ResourceLoder, this is a NOOP so far.

Specified by:

destroy in interface I_CmsResourceLoader

dump

public byte[] dump(CmsObject cms,
                   CmsResource resource,
                   java.lang.String element,
                   java.util.Locale locale,
                   javax.servlet.http.HttpServletRequest req,
                   javax.servlet.http.HttpServletResponse res)
            throws CmsException

Description copied from interface: I_CmsResourceLoader

Dumps the processed content of the the requested file (and it's sub-elements) to a byte array.

Dumping the content is like calling "load" where the result is not written to the response stream, but to the returned byte array. Dumping is different from an export because the export might actually require that the content is handled or modified in a special way, or set special http headers.

Moreover, if the page type is template based, calling "dump" will not trigger the template but directly deliver the contents from the selected element.

Specified by:

dump in interface I_CmsResourceLoader

Parameters:

cms - used to access the OpenCms VFS

resource - the requested resource in the VFS

element - the element in the file to display

locale - the locale to display

req - the servlet request

res - the servlet response

Returns:

the content of the processed file

Throws:

CmsException - in case of errors accessing OpenCms functions

See Also:

I_CmsResourceLoader.dump(org.opencms.file.CmsObject, org.opencms.file.CmsResource, java.lang.String, java.util.Locale, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

export

public byte[] export(CmsObject cms,
                     CmsResource resource,
                     javax.servlet.http.HttpServletRequest req,
                     javax.servlet.http.HttpServletResponse res)
              throws java.io.IOException,
                     CmsException

Description copied from interface: I_CmsResourceLoader

Static exports the contents of the requested file and it's sub-elements.

During static export, the resource content may be written to 2 streams: The export stream, and the http response output stream. Which stream is actually used depends whether the export is in "on demand" or "after publish" mode. In "on demand" mode, the resource needs to be written both to the response stream and to the file stream. In "after publish" mode, it's usually only written to the file stream, but sometimes it's required to write to the response stream as well.

Specified by:

export in interface I_CmsResourceLoader

Parameters:

cms - the initialized CmsObject which provides user permissions

resource - the requested OpenCms VFS resource

req - the servlet request

res - the servlet response

Returns:

the contents to export, or null if no export is required

Throws:

java.io.IOException - might be thrown in the process of including the sub element

CmsException - in case something goes wrong

See Also:

I_CmsResourceLoader.export(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

getConfiguration

public java.util.Map getConfiguration()

Will always return null since this loader does not need to be configured.

Specified by:

getConfiguration in interface I_CmsConfigurationParameterHandler

Returns:

the configuration of this resource loader, or null

See Also:

I_CmsConfigurationParameterHandler.getConfiguration()

getLoaderId

public int getLoaderId()

Description copied from interface: I_CmsResourceLoader

Returns the id of the ResourceLoader.

Specified by:

getLoaderId in interface I_CmsResourceLoader

Returns:

the id of the ResourceLoader

See Also:

I_CmsResourceLoader.getLoaderId()

getResourceLoaderInfo

public java.lang.String getResourceLoaderInfo()

Return a String describing the ResourceLoader, which is (localized to the system default locale) "The OpenCms default resource loader for unprocessed files".

Specified by:

getResourceLoaderInfo in interface I_CmsResourceLoader

Returns:

a describing String for the ResourceLoader

initConfiguration

public void initConfiguration()

Description copied from interface: I_CmsConfigurationParameterHandler

Initializes a configuration after all parameters have been added.

Specified by:

initConfiguration in interface I_CmsConfigurationParameterHandler

See Also:

I_CmsConfigurationParameterHandler.initConfiguration()

isStaticExportEnabled

public boolean isStaticExportEnabled()

Description copied from interface: I_CmsResourceLoader

Signals if the loader implementation supports static export of resources.

Specified by:

isStaticExportEnabled in interface I_CmsResourceLoader

Returns:

true if static export is supported, false otherwise

See Also:

I_CmsResourceLoader.isStaticExportEnabled()

isStaticExportProcessable

public boolean isStaticExportProcessable()

Description copied from interface: I_CmsResourceLoader

Signals if the loader implementation requires processing during static export of resources.

Specified by:

isStaticExportProcessable in interface I_CmsResourceLoader

Returns:

true if static export processing is required, false otherwise

See Also:

I_CmsResourceLoader.isStaticExportProcessable()

isUsableForTemplates

public boolean isUsableForTemplates()

Description copied from interface: I_CmsResourceLoader

Signals if the loader implementation is usable for creating templates.

Specified by:

isUsableForTemplates in interface I_CmsResourceLoader

Returns:

true if the loader implementation is usable for creating templates, false otherwise

See Also:

I_CmsResourceLoader.isUsableForTemplates()

isUsingUriWhenLoadingTemplate

public boolean isUsingUriWhenLoadingTemplate()

Description copied from interface: I_CmsResourceLoader

Signals if a loader that supports templates must be invoked on the template URI or the resource URI.

Specified by:

isUsingUriWhenLoadingTemplate in interface I_CmsResourceLoader

Returns:

true if the resource URI is to be used, false if the template URI is to be used

See Also:

I_CmsResourceLoader.isUsingUriWhenLoadingTemplate()

load

public void load(CmsObject cms,
                 CmsResource resource,
                 javax.servlet.http.HttpServletRequest req,
                 javax.servlet.http.HttpServletResponse res)
          throws java.io.IOException,
                 CmsException

Description copied from interface: I_CmsResourceLoader

Basic top-page processing method for a I_CmsResourceLoader, this method is called if the page is called as a sub-element on a page not already loaded with a I_CmsResourceLoader.

Specified by:

load in interface I_CmsResourceLoader

Parameters:

cms - the initialized CmsObject which provides user permissions

resource - the requested OpenCms VFS resource

req - the servlet request

res - the servlet response

Throws:

java.io.IOException - might be thrown by the servlet environment

CmsException - in case of errors accessing OpenCms functions

See Also:

I_CmsResourceLoader.load(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

service

public void service(CmsObject cms,
                    CmsResource resource,
                    javax.servlet.ServletRequest req,
                    javax.servlet.ServletResponse res)
             throws CmsException,
                    java.io.IOException

Description copied from interface: I_CmsResourceLoader

Does the job of including the requested resource, this method is called directly if the element is called as a sub-element from another I_CmsResourceLoader.

Specified by:

service in interface I_CmsResourceLoader

Parameters:

cms - used to access the OpenCms VFS

resource - the requested resource in the VFS

req - the servlet request

res - the servlet response

Throws:

CmsException - in case of errors accessing OpenCms functions

java.io.IOException - might be thrown by the servlet environment

See Also:

I_CmsResourceLoader.service(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.ServletRequest, javax.servlet.ServletResponse)

canSendLastModifiedHeader

protected boolean canSendLastModifiedHeader(CmsResource resource,
                                            javax.servlet.http.HttpServletRequest req,
                                            javax.servlet.http.HttpServletResponse res)

Checks if the requested resource must be send to the client by checking the "If-Modified-Since" http header.

If the resource has not been modified, the "304 - not modified" header is send to the client and true is returned, otherwise nothing is send and false is returned.

Parameters:

resource - the resource to check

req - the current request

res - the current response

Returns:

true if the "304 - not modified" header has been send to the client