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Java Source Code / Java Documentation » Library » Apache commons chain 1.1 src » org.apache.commons.chain.generic

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.chain.generic .LookupCommand

org.apache.commons.chain.generic .DispatchLookupCommand

DispatchLookupCommand

public class DispatchLookupCommand extends LookupCommand implements Filter(Code)

This command combines elements of the LookupCommand with the DispatchCommand . Look up a specified Command (which could also be a org.apache.commons.chain.Chain ) in a org.apache.commons.chain.Catalog , and delegate execution to it. Introspection is used to lookup the appropriate method to delegate execution to. If the delegated-to Command is also a Filter , its postprocess() method will also be invoked at the appropriate time.

The name of the Command can be specified either directly (via the name property) or indirectly (via the nameKey property). Exactly one of these must be set.

The name of the method to be called can be specified either directly (via the method property) or indirectly (via the methodKey property). Exactly one of these must be set.

If the optional property is set to true, failure to find the specified command in the specified catalog will be silently ignored. Otherwise, a lookup failure will trigger an IllegalArgumentException.

author:
   Sean Schofield
version:
   $Revision: 411876 $
since:
   Chain 1.1

Constructor Summary
public	DispatchLookupCommand() Create an instance with an unspecified `catalogFactory` property.
public	DispatchLookupCommand(CatalogFactory factory) Create an instance and initialize the `catalogFactory` property to given `factory`.

Method Summary
public boolean	execute(Context context)
protected Object[]	getArguments(Context context) Get the arguments to be passed into the dispatch method. Default implementation simply returns the context which was passed in, but subclasses could use this to wrap the context in some other type, or extract key values from the context to pass in.
public String	getMethod() Return the method name.
public String	getMethodKey() Return the Context key for the method name.
protected Class[]	getSignature() Return a `Class[]` describing the expected signature of the method.
public void	setMethod(String method) Set the method name.
public void	setMethodKey(String methodKey) Set the Context key for the method name.

Constructor Detail

DispatchLookupCommand
public DispatchLookupCommand()(Code)
	Create an instance with an unspecified `catalogFactory` property. This property can be set later using `setProperty`, or if it is not set, the static singleton instance from `CatalogFactory.getInstance()` will be used.

DispatchLookupCommand
public DispatchLookupCommand(CatalogFactory factory)(Code)
	Create an instance and initialize the `catalogFactory` property to given `factory`. Parameters: factory - The Catalog Factory.

Method Detail

execute
public boolean execute(Context context) throws Exception(Code)
	Look up the specified command, and (if found) execute it. Parameters: context - The context for this request the result of executing the looked-up command's method, or`false` if no command is found. throws: Exception - if no such Command can be found and the`optional` property is set to `false`

getArguments
protected Object[] getArguments(Context context)(Code)
	Get the arguments to be passed into the dispatch method. Default implementation simply returns the context which was passed in, but subclasses could use this to wrap the context in some other type, or extract key values from the context to pass in. The length and types of values returned by this must coordinate with the return value of `getSignature()` Parameters: context - The context associated with the request the method arguments to be used

getMethod
public String getMethod()(Code)
	Return the method name. The method name.

getMethodKey
public String getMethodKey()(Code)
	Return the Context key for the method name. The Context key for the method name.

getSignature

protected Class[] getSignature()(Code)

Return a Class[] describing the expected signature of the method. The default is a signature that just accepts the command's Context . The method can be overidden to provide a different method signature.

the expected method signature

setMethod
public void setMethod(String method)(Code)
	Set the method name. Parameters: method - The method name.

setMethodKey
public void setMethodKey(String methodKey)(Code)
	Set the Context key for the method name. Parameters: methodKey - The Context key for the method name.

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

public boolean execute(Context context) throws Exception(Code)(Java Doc)
public CatalogFactory getCatalogFactory()(Code)(Java Doc)
public String getCatalogName()(Code)(Java Doc)
protected Command getCommand(Context context)(Code)(Java Doc)
public String getName()(Code)(Java Doc)
public String getNameKey()(Code)(Java Doc)
public boolean isIgnoreExecuteResult()(Code)(Java Doc)
public boolean isIgnorePostprocessResult()(Code)(Java Doc)
public boolean isOptional()(Code)(Java Doc)
public boolean postprocess(Context context, Exception exception)(Code)(Java Doc)
public void setCatalogFactory(CatalogFactory catalogFactory)(Code)(Java Doc)
public void setCatalogName(String catalogName)(Code)(Java Doc)
public void setIgnoreExecuteResult(boolean ignoreReturn)(Code)(Java Doc)
public void setIgnorePostprocessResult(boolean ignorePostprocessResult)(Code)(Java Doc)
public void setName(String name)(Code)(Java Doc)
public void setNameKey(String nameKey)(Code)(Java Doc)
public void setOptional(boolean optional)(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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