ClassWebResource (zk 8.0.0 API)

java.lang.Object
- org.zkoss.web.util.resource.ClassWebResource

```
public class ClassWebResource
extends java.lang.Object
```
Used to access resources located in class path and under /web. It doesn't work alone. Rather, it is a helper for servlet, such as ZK's update servlet.
Typical use:
1. Declares a member in the servlet to serve the request for the resource located in class path.
2. Invoke getInstance(javax.servlet.ServletContext, java.lang.String) to init the member when Servlet.init() is called.
3. Calling service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) when a request is receive.
Note: it assumes the file being loaded and the output stream is encoded in UTF-8 unless the extendlet handles it differently.
Author:

tomyeh

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`FILTER_INCLUDE` Indicates that the filter is applicable if the request is dispatched due to the inclusion.
`static int`	`FILTER_REQUEST` Indicates that the filter is applicable if the request comes directly from the client.
`static java.lang.String`	`PATH_PREFIX` The prefix of path of web resources ("/web").

Method Summary

Methods
Modifier and Type	Method and Description
`Extendlet`	`addExtendlet(java.lang.String ext, Extendlet extlet)` Adds an `Extendlet` (a.k.a., resource processor) to process the resource of the specified extension.
`void`	`addFilter(java.lang.String ext, Filter filter, int flags)` Adds a filter (`Filter`) to perform filtering task for the resource of the specified extension.
`static java.net.URL`	`getClassResource(java.lang.String uri)` Returns the URL of the resource of the specified URI by searching only the class path (with `PATH_PREFIX`).
`static java.io.InputStream`	`getClassResourceAsStream(java.lang.String uri)` Returns the resource in a stream of the specified URI by searching only the class path (with `PATH_PREFIX`).
`java.lang.String[]`	`getCompress()` Returns the extension that shall be compressed if the browser supports the compression encoding (accept-encoding).
`java.lang.String`	`getEncodeURLPrefix()` Returns the prefix used to encoding the URL, or null if no prefix.
`Extendlet`	`getExtendlet(java.lang.String ext)` Returns the Extendlet (a.k.a., resource processor) of the specified extension, or null if not associated.
`Extendlet`	`getExtendlet(java.lang.String ext, boolean lookup)` Returns the Extendlet (aka., resource processor) of the specified extension, or null if not associated.
`Locator`	`getExtraLocator()` Returns the extra locator, or null if not available.
`Filter[]`	`getFilters(java.lang.String ext, int flag)` Returns an array of the filters (`Filter`) of the specified extension, or null if not associated.
`static ClassWebResource`	`getInstance(javax.servlet.ServletContext ctx, java.lang.String mappingURI)` Returns the instance (singleton in the whole app) for handling resources located in class path.
`java.net.URL`	`getResource(java.lang.String uri)` Returns the URL of the resource of the specified URI by searching the extra locator, if any, and then the class path (with `PATH_PREFIX`).
`java.io.InputStream`	`getResourceAsStream(java.lang.String uri)` Returns the resource in a stream of the specified URI by searching the extra locator, if any, and then, the class path (with `PATH_PREFIX`).
`boolean`	`isDebugJS()` Returns whether to debug JavaScript files.
`Extendlet`	`removeExtendlet(java.lang.String ext)` Removes the `Extendlet` (a.k.a., resource processor) for the specified extension.
`boolean`	`removeFilter(java.lang.String ext, Filter filter, int flags)` Removes the filter (`Filter`) for the specified extension.
`void`	`service(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)` Process the request by retrieving the path from the path info.
`void`	`service(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String path)` Process the request with the specified path.
`void`	`setCompress(java.lang.String[] exts)` Sets the extension that shall be compressed if the browser supports the compression encoding (accept-encoding).
`void`	`setDebugJS(boolean debug)` Sets whether to debug JavaScript files.
`void`	`setEncodeURLPrefix(java.lang.String prefix)` Sets the prefix used to encoding the URL.
`void`	`setExtraLocator(Locator loc)` Sets the extra locator.
`void`	`setMappingURI(java.lang.String mappingURI)` Called by WebManager#setUpdateUri when WebManager is created by HttpSessionListener#contextInitialized

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PATH_PREFIX
```
public static final java.lang.String PATH_PREFIX
```
    The prefix of path of web resources ("/web").
    
    See Also:
    Constant Field Values
  - FILTER_REQUEST
```
public static final int FILTER_REQUEST
```
    Indicates that the filter is applicable if the request comes directly from the client.
    
    Since:
    
    3.5.1
    
    See Also:
    addFilter(java.lang.String, org.zkoss.web.util.resource.Filter, int), Constant Field Values
  - FILTER_INCLUDE
```
public static final int FILTER_INCLUDE
```
    Indicates that the filter is applicable if the request is dispatched due to the inclusion. In other words, it is included by other servlet.
    
    Since:
    
    3.5.1
    
    See Also:
    addFilter(java.lang.String, org.zkoss.web.util.resource.Filter, int), Constant Field Values
- Method Detail
  - getClassResource
```
public static java.net.URL getClassResource(java.lang.String uri)
```
    Returns the URL of the resource of the specified URI by searching only the class path (with PATH_PREFIX).
    On the other hand, getResource(java.lang.String) will search the extra locator first (getExtraLocator()) and then the class path.
    
    Since:
    
    5.0.0
  - getClassResourceAsStream
```
public static java.io.InputStream getClassResourceAsStream(java.lang.String uri)
```
    Returns the resource in a stream of the specified URI by searching only the class path (with PATH_PREFIX).
    On the other hand, getResourceAsStream(java.lang.String) will search the extra locator first (getExtraLocator()) and then the class path.
    
    Since:
    
    5.0.0
  - getResource
```
public java.net.URL getResource(java.lang.String uri)
```
    Returns the URL of the resource of the specified URI by searching the extra locator, if any, and then the class path (with PATH_PREFIX).
    This method becomes non-static since 5.0.0, and it will search the extra locator (getExtraLocator()) first.
  - getResourceAsStream
```
public java.io.InputStream getResourceAsStream(java.lang.String uri)
```
    Returns the resource in a stream of the specified URI by searching the extra locator, if any, and then, the class path (with PATH_PREFIX).
    This method becomes non-static since 5.0.0, and it will search the extra locator (getExtraLocator()) first.
  - getInstance
```
public static final ClassWebResource getInstance(javax.servlet.ServletContext ctx,
                           java.lang.String mappingURI)
```
    Returns the instance (singleton in the whole app) for handling resources located in class path.
  - getExtraLocator
```
public Locator getExtraLocator()
```
    Returns the extra locator, or null if not available. The extra locator, if specified, has the higher priority than the class path.
    Default: null.
    
    Since:
    
    5.0.0
  - setExtraLocator
```
public void setExtraLocator(Locator loc)
```
    Sets the extra locator. The extra locator, if specified, has the higher priority than the class path.
    Default: null.
    
    Since:
    
    5.0.0
  - service
```
public void service(javax.servlet.http.HttpServletRequest request,
           javax.servlet.http.HttpServletResponse response)
             throws javax.servlet.ServletException,
                    java.io.IOException
```
    Process the request by retrieving the path from the path info. It invokes Https.getThisPathInfo(javax.servlet.ServletRequest) to retrieve the path info, and then invoke service(HttpServletRequest,HttpServletResponse,String).
    If the path info is not found, nothing is generated.
    
    Throws:
    
    javax.servlet.ServletException
    
    java.io.IOException
    Since:
    
    2.4.1
  - service
```
public void service(javax.servlet.http.HttpServletRequest request,
           javax.servlet.http.HttpServletResponse response,
           java.lang.String path)
             throws javax.servlet.ServletException,
                    java.io.IOException
```
    Process the request with the specified path.
    
    Parameters:
    path - the path related to the class path
    
    Throws:
    
    javax.servlet.ServletException
    
    java.io.IOException
    Since:
    
    3.0.0
  - getExtendlet
```
public Extendlet getExtendlet(java.lang.String ext,
                     boolean lookup)
```
    Returns the Extendlet (aka., resource processor) of the specified extension, or null if not associated.
    
    Parameters:
    ext - the extension, e.g, "js" and "css.dsp".
    lookup - whether to search different combination of the given extension. For example, if the extension is "js.dsp" and lookup is true, it first searches any extendlet registered for "js.dsp". If not found, it searches any extendlet for "dsp". However, if lookup is false, it searches only "js.dsp".
    
    Returns:
    the Extendlet (aka., resource processor), or null if not associated yet.
    Since:
    
    6.0.0
  - getExtendlet
```
public Extendlet getExtendlet(java.lang.String ext)
```
    Returns the Extendlet (a.k.a., resource processor) of the specified extension, or null if not associated.
    It is a shortcut of getExtendlet(ext, true).
    
    Parameters:
    ext - the extension, e.g, "js" and "css.dsp".
    
    Returns:
    the Extendlet (a.k.a., resource processor), or null if not associated yet.
    Since:
    
    2.4.1
  - addExtendlet
```
public Extendlet addExtendlet(java.lang.String ext,
                     Extendlet extlet)
```
    Adds an Extendlet (a.k.a., resource processor) to process the resource of the specified extension.
    
    Parameters:
    ext - the extension, e.g, "js" and "css".
    extlet - the Extendlet (a.k.a., resource processor) to add
    
    Returns:
    the previous Extendlet, or null if not associated before.
    Since:
    
    2.4.1
  - removeExtendlet
```
public Extendlet removeExtendlet(java.lang.String ext)
```
    Removes the Extendlet (a.k.a., resource processor) for the specified extension.
    
    Parameters:
    ext - the extension, e.g, "js" and "css.dsp".
    
    Returns:
    the previous Extendlet, or null if no Extendlet was associated with the specified extension.
    Since:
    
    2.4.1
  - getFilters
```
public Filter[] getFilters(java.lang.String ext,
                  int flag)
```
    Returns an array of the filters (Filter) of the specified extension, or null if not associated.
    Note: if the extension is "js.dsp", then it searches any filters registered for "js.dsp". If not found, it searches any filters for "dsp". In other words, "dsp" is searched only if no filter is registered for "js.dsp".
    
    Parameters:
    ext - the extension, such as "js" and "css.dsp".
    flag - either FILTER_REQUEST or and FILTER_INCLUDE. If 0, FILTER_REQUEST is assumed.
    Since:
    
    3.5.1
  - addFilter
```
public void addFilter(java.lang.String ext,
             Filter filter,
             int flags)
```
    Adds a filter (Filter) to perform filtering task for the resource of the specified extension.
    Unlike addExtendlet(java.lang.String, org.zkoss.web.util.resource.Extendlet), multiple filters can be applied to the same extension. The first one being added will be called first.
    
    Parameters:
    ext - the extension
    filter - the filter
    flags - a combination of FILTER_REQUEST and FILTER_INCLUDE. If 0, FILTER_REQUEST is assumed.
    Since:
    
    3.5.1
  - removeFilter
```
public boolean removeFilter(java.lang.String ext,
                   Filter filter,
                   int flags)
```
    Removes the filter (Filter) for the specified extension.
    
    Parameters:
    flags - a combination of FILTER_REQUEST and FILTER_INCLUDE. If 0, FILTER_REQUEST is assumed.
    
    Returns:
    whether the filter has been removed successfully.
    Since:
    
    3.5.1
  - setCompress
```
public void setCompress(java.lang.String[] exts)
```
    Sets the extension that shall be compressed if the browser supports the compression encoding (accept-encoding).
    Default: null (no compression at all).
    
    Parameters:
    exts - an array of extensions, e.g., {"js", "css", "html"}. If null or zero-length, it means no compression at all.
    Since:
    
    2.4.1
  - getCompress
```
public java.lang.String[] getCompress()
```
    Returns the extension that shall be compressed if the browser supports the compression encoding (accept-encoding).
    Default: null (no compression at all).
    
    Since:
    
    2.4.1
  - isDebugJS
```
public boolean isDebugJS()
```
    Returns whether to debug JavaScript files. If true, it means the original (i.e., uncompressed) JavaScript files shall be loaded instead of compressed JavaScript files.
    
    Since:
    
    3.0.4
    
    See Also:
    setDebugJS(boolean)
  - setDebugJS
```
public void setDebugJS(boolean debug)
```
    Sets whether to debug JavaScript files.
    Default: false.
    If true is specified, it will try to load the original Java (i.e., uncompressed) file instead of the compressed one. For example, if service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) is called to load abc.js, and isDebugJS(), then service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) will try to load abc.src.js first. If not found, it loads ab.js instead.
    If isDebugJS() is false (default), abc.js is always loaded.
    
    Parameters:
    debug - whether to debug JavaScript files. If true, the original JavaScript files shall be loaded instead of the compressed files.
    Since:
    
    3.0.4
  - setMappingURI
```
public void setMappingURI(java.lang.String mappingURI)
```
    Called by WebManager#setUpdateUri when WebManager is created by HttpSessionListener#contextInitialized
    
    Parameters:
    mappingURI - mapping URI excluding PATH_PREFIX.
  - setEncodeURLPrefix
```
public void setEncodeURLPrefix(java.lang.String prefix)
```
    Sets the prefix used to encoding the URL. The prefix will be encoded when ExtendletContext.encodeURL(javax.servlet.ServletRequest, javax.servlet.ServletResponse, java.lang.String) is called. The prefix is usually the build number, such that browser won't use the wrong cached version
    Default: null (no special encoding).
    
    Parameters:
    prefix - the prefix used to encode URL for the extendlet. If prefix is not empty and doesn't start with '/', it will be prefixed with '/'.
    Since:
    
    3.6.3
  - getEncodeURLPrefix
```
public java.lang.String getEncodeURLPrefix()
```
    Returns the prefix used to encoding the URL, or null if no prefix. If an non-null prefix is returned, it must start with '/'.
    
    Since:
    
    3.6.3
    
    See Also:
    ExtendletContext.encodeURL(javax.servlet.ServletRequest, javax.servlet.ServletResponse, java.lang.String)

Class ClassWebResource

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PATH_PREFIX

FILTER_REQUEST

FILTER_INCLUDE

Method Detail

getClassResource

getClassResourceAsStream

getResource

getResourceAsStream

getInstance

getExtraLocator

setExtraLocator

service

service

getExtendlet

getExtendlet

addExtendlet

removeExtendlet

getFilters

addFilter

removeFilter

setCompress

getCompress

isDebugJS

setDebugJS

setMappingURI

setEncodeURLPrefix

getEncodeURLPrefix