com.ibm.di.connector
Class ScriptConnector

java.lang.Object
  com.ibm.di.connector.Connector
      com.ibm.di.connector.ScriptConnector

All Implemented Interfaces:

ConnectorInterface, VersionInfoInterface

public class ScriptConnector
extends Connector
implements ConnectorInterface

The Script Connector enables you to write your own Connector in JavaScript. A Script Connector must implement a few functions to operate. If you plan to use it for iteration purposes only (for example, reading, not searching or updating), you can operate with two functions only. If you plan to use it as a fully qualified Connector, you must implement all functions. The functions do not use parameters. Passing data between the hosting Connector and the script is enabled by using predefined objects. One of these predefined objects is the result object, which is used to communicate status information. Upon entry in either function, the status field is set to normal, which causes the hosting Connector to continue calls. Signaling end-of-input or error is done by setting the status and message fields in this object. Two other script objects are defined upon function entry, the entry object and the search object.

Field Summary

Fields inherited from class com.ibm.di.connector.Connector

ALL_MODES, myLog, PROPERTY_MESSAGE, PROPERTY_READER, PROPERTY_WRITER

Constructor Summary

ScriptConnector()
Class constructor.

Method Summary

void	deleteEntry(Entry entry, SearchCriteria search) Deletes an existing entry.
Entry	findEntry(SearchCriteria search) Finds an existing entry.
Entry	getNextEntry() Returns the next Entry from the connector.
String	getVersion() Return version information
void	initialize(Object obj) Initialize the connector.
void	modEntry(Entry entry, SearchCriteria search) Modifies an existing entry.
void	modEntry(Entry entry, SearchCriteria search, Entry old) Modifies an existing entry.
void	putEntry(Entry entry) Adds a new entry to the data source
Entry	queryReply(Entry entry) Performs a query/reply operations.
Object	querySchema(Object source) This function translates to whatever means a connector has to discover schema for a connection.
void	selectEntries() Prepare the Connector for sequential read.
void	terminate() Terminate the connector.

Methods inherited from class com.ibm.di.connector.Connector

addFindEntry, allModes, clearFindEntries, debug, debugMode, findEntry, getBoolean, getClassInstance, getConfiguration, getContext, getFindEntryCount, getFirstFindEntry, getLog, getMaxDuplicateEntries, getModes, getModes, getName, getNextClient, getNextFindEntry, getParam, getParser, getProperty, getPushbackEntry, getRawConnectorConfiguration, getRSInterface, getUI, hasConfigValue, hasParser, initParser, isDeltaSupported, isExceptionFatal, isIOException, logError, logmsg, pushback, queryOperations, queryTables, reconnect, reconnect, registerScriptBeans, replyEntry, setConfiguration, setContext, setCurrent, setDebugMode, setLog, setMaxDuplicateEntries, setModes, setModes, setName, setParam, setParser, setProperty, setRSInterface, terminateServer

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.ibm.di.connector.ConnectorInterface

getConfiguration, getContext, getFindEntryCount, getFirstFindEntry, getMaxDuplicateEntries, getName, getNextClient, getNextFindEntry, getParam, getPushbackEntry, getRawConnectorConfiguration, isDeltaSupported, isExceptionFatal, isIOException, pushback, queryOperations, reconnect, registerScriptBeans, replyEntry, setConfiguration, setContext, setCurrent, setLog, setMaxDuplicateEntries, setName, setParam, setRSInterface, terminateServer

Constructor Detail

ScriptConnector

public ScriptConnector()

Class constructor.

Method Detail

initialize

public void initialize(Object obj)
                throws Exception

Initialize the connector. The connector may be passed a parameter of any kind by the user. It is up to the connector to determine whether this object can be used or not. The parameter is typically provided by a user script. When an AssemblyLine initializes it's Connectors, they are passed a ConnectorMode object.

Specified by:

initialize in interface ConnectorInterface

Overrides:

initialize in class Connector

Parameters:

obj - User provided parameter

Throws:

Exception - if the initialization of this connector fails.

selectEntries

public void selectEntries()
                   throws Exception

Prepare the Connector for sequential read. If necessary, create a result set to be used for getNextEntry(). When the Connector is used as an Iterator in an AssemblyLine, this method will be called. Default is an empty method.

Specified by:

selectEntries in interface ConnectorInterface

Overrides:

selectEntries in class Connector

Throws:

Exception - if an error occurs.

getNextEntry

public Entry getNextEntry()
                   throws Exception

Returns the next Entry from the connector. The entry is populated with attributes and values from the next entry in the input set.

Example:

 var ctor = input.getConnector();
 var entry = ctor.getNextEntry();
 
 for (; entry != null; entry = ctor.getNextEntry()) {
        main.logmsg("Read entry...");
        main.dumpEntry(entry);
 }
 

Specified by:

getNextEntry in interface ConnectorInterface

Overrides:

getNextEntry in class Connector

Returns:

- the next Entry, or null if no more data

Throws:

Exception - if an error occurs.

See Also:

ConnectorInterface.selectEntries()

modEntry

public void modEntry(Entry entry,
                     SearchCriteria search)
              throws Exception

Modifies an existing entry. The new entry data is given by the entry parameter and the search criteria specifies which entry to modify.

Specified by:

modEntry in interface ConnectorInterface

Overrides:

modEntry in class Connector

Parameters:

entry - The entry data

search - The search criteria used to locate the entry to be modified

Throws:

Exception - if an error occurs.

modEntry

public void modEntry(Entry entry,
                     SearchCriteria search,
                     Entry old)
              throws Exception

Modifies an existing entry. The new entry data is given by the entry parameter and the search criteria specifies which entry to modify.

Specified by:

modEntry in interface ConnectorInterface

Overrides:

modEntry in class Connector

Parameters:

entry - The entry data

search - The search criteria used to locate the entry to be modified

old - The old entry found by the search criteria

Throws:

Exception - if an error occurs.

deleteEntry

public void deleteEntry(Entry entry,
                        SearchCriteria search)
                 throws Exception

Deletes an existing entry. The search criteria specifies which entry to modify. Some connectors may silently ignore the search criteria. For example, the LDAP connector will use the distinguished name ($dn) from the entry parameter (if it exists) rather than expanding the search criteria and search for the entry. Each connector's inner semantics governs whether the search parameter is used or not.

Specified by:

deleteEntry in interface ConnectorInterface

Overrides:

deleteEntry in class Connector

Parameters:

entry - The entry data

search - The search criteria used to locate the entry to be deleted

Throws:

Exception - if an error occurs.

findEntry

public Entry findEntry(SearchCriteria search)
                throws Exception

Finds an existing entry. The search criteria specifies which entry to locate

Here is an example of how to find all people with names starting with 'J' which are from IBM organization in US.

Example:

 var ctor = input.getConnector();
 var crit = new com.ibm.di.SearchCriteria("$dn",
                com.ibm.di.SearchCriteria.SUBSTRING, "c=US,o=IBM");
 crit.addCriteria("name", com.ibm.di.SearchCriteria.INITIAL_STRING, "J");
 crit.addCriteria("objectclass", com.ibm.di.SearchCriteria.SUBSTRING, "person");
 
 var res = ctor.findEntry(crit);
 if (res != null) {
        main.logmsg("Found entry:");
        main.dumpEntry(res);
 } else {
  if( getFindEntryCount()> 1 ){
   main.logmsg("Found these entries:");
   while ( (entry = ctor.getNextFindEntry()) != null ) {
     main.dumpEntry(entry);
   }
  }
  else {
         main.logmsg("Entry not found!");
  }
 }
 

Specified by:

findEntry in interface ConnectorInterface

Overrides:

findEntry in class Connector

Parameters:

search - The search criteria used to locate the entry to be modified

Returns:

The entry found, or null if no or multiple entries found

Throws:

Exception - if an error occurs.

putEntry

public void putEntry(Entry entry)
              throws Exception

Adds a new entry to the data source

Example:

 var ctor = write.getConnector();
 
 for (i = 0; i < 10; i++) {
        var entry = system.newEntry();
        entry.setAttribute("linenumber", i);
        entry.setAttribute("line", i + " line of text...");
 
        main.logmsg("Writes entry to output...");
        main.dumpEntry(entry);
        ctor.putEntry(entry);
 }
 

Specified by:

putEntry in interface ConnectorInterface

Overrides:

putEntry in class Connector

Parameters:

entry - The entry data to add

Throws:

Exception - if an error occurs.

queryReply

public Entry queryReply(Entry entry)
                 throws Exception

Performs a query/reply operations.

Specified by:

queryReply in interface ConnectorInterface

Overrides:

queryReply in class Connector

Parameters:

entry - The data used in outgoing call

Returns:

The entry returned by the peer

Throws:

Exception - if an error occurs.

terminate

public void terminate()
               throws Exception

Terminate the connector. This function closes all connection and releases all resources used by the connector. This function also calls the parser's closeParser() method if a parser is active.

Specified by:

terminate in interface ConnectorInterface

Overrides:

terminate in class Connector

Throws:

Exception - if an error occurs.

querySchema

public Object querySchema(Object source)
                   throws Exception

This function translates to whatever means a connector has to discover schema for a connection. The connector may implement this, in which case a Vector of Entry objects is returned for each column/attribute it discovered. For a database connector this would typically be column names and their attributes.

Each Entry in the Vector returned should contain the following attributes:

Name	Value
name	The name of the column/attribute/field ....
syntax	The syntax or expected value type
size	If specified this will give the user a hint as to how long the field may be

Specified by:

querySchema in interface ConnectorInterface

Overrides:

querySchema in class Connector

Parameters:

source - The object on which to discover schema. This may be an Entry or a string value

Returns:

A Vector of com.ibm.di.entry.Entry objects describing each entity

Throws:

Exception - if an error while retrieving the schema occurs.

See Also:

Entry, Vector

getVersion

public String getVersion()

Return version information

Specified by:

getVersion in interface VersionInfoInterface

Returns:

version info