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oracle.as.scheduler.substitution
Class SubstitutorImpl

java.lang.Object
oracle.as.scheduler.substitution.SubstitutorImpl

All Implemented Interfaces:

Substitutor

public class SubstitutorImpl

extends java.lang.Object

implements Substitutor

Perform token substitutions on a string using a set of SubstitutionHandlers. This class provides much of the functionality needed to create a Substitutor. Substitution tokens can take any of the following forms:

 ${NAME}
 ${ID:NAME}
 ${ID1,ID2:NAME}
 

The NAME portion of the token is passed to SubstitutionHandler.containsKey(String) and SubstitutionHandler.get(String).

The ID portion of the token is matched with the value of SubstitutionHandler.getId(). If no ID is specified, the first handler in the list that responds to NAME is used. If one or more IDs are specified, then only handlers reporting matching IDs will be queried for the given NAME. # see SubstitutionHandler

Constructor Summary

SubstitutorImpl()

Method Summary

void	close() Cleanup substitutor state and release all handlers.
protected void	closeHandlers() Call close() on all instantiated handlers, and release the instances.
protected SubstitutionHandler	getMatchingHandler(java.lang.String subId, java.lang.String name) Find the first handler in the list that matches on substitution ID and name.
protected boolean	initializeHandler(SubstitutionHandler handler) Implementations of SubstitutorImpl may override this method to perform implementation specific initialization for each handler instance.
void	setSubstitutionHandlers(java.util.List<SubstitutionHandler> handlers) Set the list of SubstitutionHandlers to use.
void	setSubstitutionHandlers(java.lang.String subsHandlerNames) Set the list of SubstitutionHandlers to use.
protected java.util.List<SubstitutionHandler>	stringToHandlers(java.lang.String subsHandlerNames) Parse the subsHandlerNames string, instantiate the named SubstitutionHandler classes, and return them in a list.
java.lang.String	substitute(java.lang.String original) Recursively replaces all tokens in the string original with the results from matching handlers.
protected java.lang.String	substituteTokens(java.lang.String valueTokens, java.util.List<java.lang.String> tokenHistory) Takes a string with tokens and returns the values; called recursively

Methods inherited from class java.lang.Object

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

Constructor Detail

SubstitutorImpl

public SubstitutorImpl()

Method Detail

setSubstitutionHandlers

public void setSubstitutionHandlers(java.lang.String subsHandlerNames)

Set the list of SubstitutionHandlers to use.

Specified by:

setSubstitutionHandlers in interface Substitutor

Parameters:

subsHandlerNames - Comma-separated list of class names that implement SubstitutionHandler

setSubstitutionHandlers

public void setSubstitutionHandlers(java.util.List<SubstitutionHandler> handlers)

Set the list of SubstitutionHandlers to use.

Specified by:

setSubstitutionHandlers in interface Substitutor

Parameters:

handlers - List of SubstitutionHandlers

close

public void close()

Cleanup substitutor state and release all handlers.

Specified by:

close in interface Substitutor

closeHandlers

protected void closeHandlers()

Call close() on all instantiated handlers, and release the instances.

stringToHandlers

protected java.util.List<SubstitutionHandler> stringToHandlers(java.lang.String subsHandlerNames)

Parse the subsHandlerNames string, instantiate the named SubstitutionHandler classes, and return them in a list.

Any names that cannot be instantiated as a valid SubstitutionHandler will be skipped.

Parameters:

subsHandlerNames - Comma-separated list substitution handler class names.

Returns:

List of instantiated handlers

initializeHandler

protected boolean initializeHandler(SubstitutionHandler handler)

Implementations of SubstitutorImpl may override this method to perform implementation specific initialization for each handler instance.

Returns:

True if the initialization was successful, false if the handler should be skipped.

substitute

public java.lang.String substitute(java.lang.String original)
                            throws SubstitutionException

Recursively replaces all tokens in the string original with the results from matching handlers. Any tokens that are not recognized by any handlers will remain in the string.

Specified by:

substitute in interface Substitutor

Parameters:

original -

Returns:

String with substitutions performed.

Throws:

SubstitutionException - if an error occurs during substitution

substituteTokens

protected java.lang.String substituteTokens(java.lang.String valueTokens,
                                            java.util.List<java.lang.String> tokenHistory)
                                     throws SubstitutionException

Takes a string with tokens and returns the values; called recursively

Parameters:

valueTokens - Input string containing zero or more tokens to be replaced

tokenHistory - List of substitutions that got us here; used for circular reference detection. Should be an empty (not null) list on first invocation.

Returns:

All tokens we can handle have been replaced (including recursion).

Throws:

SubstitutionException

getMatchingHandler

protected SubstitutionHandler getMatchingHandler(java.lang.String subId,
                                                 java.lang.String name)
                                          throws SubstitutionException

Find the first handler in the list that matches on substitution ID and name. The handlers are queried in the order they appear in the list of SubstitutionHandlers passed to the Substitutor, and the first match is the one used. The order of the IDs in the token has no effect.

Parameters:

subId - - Comma-separated list of IDs to match. If null, match any handler.

name - - the name of to key to search for.

Returns:

Handler that responds to subId and name.

Throws:

SubstitutionException

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