org.apache.shale.clay.utils
Class PluggableLookupCommand

java.lang.Object
  org.apache.commons.chain.generic.LookupCommand
      org.apache.shale.clay.utils.PluggableLookupCommand

All Implemented Interfaces:

Command, Filter

public class PluggableLookupCommand
extends LookupCommand

This chains class performs a check to verify the catalog exists. If the catalog doesn't exist, it returns true if the optional property in the super class is true. If the catalog is not found and the command is not optional, it returns a false value. Otherwise, if the catalog exists, the super implementation is invoked. The name of the command can be a value binding expression. The value is evaluated if it contains an expression and the resolved command is invoked.

Field Summary

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

CONTINUE_PROCESSING, PROCESSING_COMPLETE

Constructor Summary

PluggableLookupCommand()

Method Summary

boolean

execute(Context context) Adds an additional check to determine if the catalog name is loaded.

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

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

Constructor Detail

PluggableLookupCommand

public PluggableLookupCommand()

Method Detail

execute

public boolean execute(Context context)
                throws Exception

Adds an additional check to determine if the catalog name is loaded. If loaded, the super implementation is invoked. Otherwise, the chain continues if the command is optional.

Specified by:

execute in interface Command

Overrides:

execute in class LookupCommand

Parameters:

context - chains context

Returns:

true if the chain is done

Throws:

Exception - up the calling chain