org.apache.commons.chain.web.servlet
Class RequestParameterMapper

java.lang.Object
  org.apache.commons.chain.generic.LookupCommand
      org.apache.commons.chain.web.servlet.RequestParameterMapper

All Implemented Interfaces:

Command, Filter

public class RequestParameterMapper
extends LookupCommand
implements Command

Command that uses a specified request parameter to select a Command from the appropriate Catalog, and execute it. To use this command, you would typically map an instance of ChainProcessor to a wildcard pattern like "*.execute" and then arrange that this is the default command to be executed. In such an environment, a request for the context-relative path "/foo.execute?command=bar" would cause the "/bar" command to be loaded and executed.

Author:

Craig R. McClanahan

Field Summary

Fields inherited from interface org.apache.commons.chain.Command

CONTINUE_PROCESSING, PROCESSING_COMPLETE

Constructor Summary

RequestParameterMapper()

Method Summary

protected Catalog	getCatalog(Context context) Return the Catalog to look up the Command in.
String	getCatalogKey() Return the context key under which our Catalog has been stored.
protected String	getCommandName(Context context) Look up the specified request paramater for this request, and use it to select an appropriate Command to be executed.
String	getParameter() Deprecated. Use catalogName to specify the name of the catalog in the catalog factory
void	setCatalogKey(String catalogKey) Deprecated. Use catalogName to specify the name of the catalog in the catalog factory
void	setParameter(String parameter) Set the name of the request parameter to use for selecting the Command to be executed.

Methods inherited from class org.apache.commons.chain.generic.LookupCommand

execute, getCatalogFactory, getCatalogName, getCommand, getName, getNameKey, isIgnoreExecuteResult, isIgnorePostprocessResult, isOptional, postprocess, setCatalogFactory, setCatalogName, setIgnoreExecuteResult, setIgnorePostprocessResult, setName, setNameKey, setOptional

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.chain.Command

execute

Constructor Detail

RequestParameterMapper

public RequestParameterMapper()

Method Detail

getCatalogKey

public String getCatalogKey()

Return the context key under which our Catalog has been stored.

Returns:

The context key for the Catalog.

setCatalogKey

public void setCatalogKey(String catalogKey)

Deprecated. Use catalogName to specify the name of the catalog in the catalog factory

Set the context key under which our Catalog has been stored.

Parameters:

catalogKey - The new catalog key

getParameter

public String getParameter()

Deprecated. Use catalogName to specify the name of the catalog in the catalog factory

Return the name of the request parameter to use for selecting the Command to be executed.

Returns:

The name of the request parameter.

setParameter

public void setParameter(String parameter)

Set the name of the request parameter to use for selecting the Command to be executed.

Parameters:

parameter - The new parameter name

getCommandName

protected String getCommandName(Context context)

Look up the specified request paramater for this request, and use it to select an appropriate Command to be executed.

Overrides:

getCommandName in class LookupCommand

Parameters:

context - Context for the current request

Returns:

The name of the Command instance

Since:

Chain 1.2

getCatalog

protected Catalog getCatalog(Context context)

Return the Catalog to look up the Command in.

Overrides:

getCatalog in class LookupCommand

Parameters:

context - Context for this request

Returns:

The catalog.

Throws:

IllegalArgumentException - if no Catalog can be found

Since:

Chain 1.2