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_JPO

The _JPO element runs custom code to retrieve metadata and objects from the repository.

Using the _JPO element constructs a Java Program Object (JPO) and calls a method of the new object. For more information about Java Program Objects, refer to the Enovia documentation.

The method takes a matrix.db.Context object and a String array. The String array can be unpacked using the method matrix.db.JPO.unpackArgs, which returns a java.util.Map.

The unpacked map contains the following keys and values:

Key Type Value
connector_task String The name of the connector task.
document_name String The document_name as specified by the DOCUMENT element.
top_level_object_id String The ID of the current object being processed from the initial query.
include_map java.util.Map The replacement values from previous _INCLUDE, _INCLUDE_CHILDREN or _JPO elements in the DocumentsXML hierarchy.
relationship_id String The relationship ID if the current object is a relationship.
object_id String The object ID if the current object is a business object.
element_attributes java.util.Map Any additional attributes of the _JPO element.

The method must return a java.util.Map. The map can define the following keys and values:

Key Type Value
metadata java.util.Map The field names and values. The map entry value is either a String or a java.util.List of String (for multi-value fields).
object_ids

A java.util.List of object IDs, or a single object ID as a String.

 The objects to process when child elements are added following the _JPO element in the DocumentsXML hierarchy.
relationship_ids

A java.util.List of relationship IDs or a single relationship ID as a String.

 The relationships to process when child elements are added following the _JPO element in the DocumentsXML hierarchy.
include_map java.util.Map New replacement values to override those from previous _INCLUDE, _INCLUDE_CHILDREN or _JPO elements in the DocumentsXML hierarchy.
include_xpath String An XPath expression to include an XML fragment. The XML fragment replaces the child elements in the DocumentsXML hierarchy.

_JPO Element Attributes

Attribute Description
node_name

The name of the metadata field created to contain the metadata retrieved by your custom code. If node_name is not specified the child metadata is added at the current depth in the document metadata. node_name only adds structure to the metadata and does not affect the metadata itself.

When name_attr is specified, node_name instead specifies the field name to be generated. No parent field is generated in this case. The metadata field names from the repository are stored as field attribute values.

If node_name is not specified, but name_attr is specified, the default field name attr is used.
name_attr

The name of the XML metadata attribute to contain the name of metadata fields retrieved from the repository.
jpo_name

The name of the Java Program Object (JPO) that is instantiated.

The constructor of the JPO takes a matrix.db.Context object and a String array of additional arguments - this array is empty.
jpo_method

The name of the method to call. The method must return a java.util.Map.

Example

The following code could be used in the Java Program Object:

import matrix.db.*;
import java.util.*;

public class ${CLASSNAME}
{
   // JPO constructor.
   // The String[] argument will always be called by the
   // connector with an empty array.

   public ${CLASSNAME} (Context context, String[] args)
   {
   }

   // JPO method.
   // The String[] argument contains a java.util.Map
   // Use matrix.db.JPO.unpackArgs to extract the Map.
   // Return java.util.Map containing any metadata
   // and IDs in the required structure.

   public Map doSomething(Context context, String[] args)
   {
      Map input = (Map)JPO.unpackArgs(args);
      Map output = new HashMap();

      // This example just passes the input object or relationship 
      // ID straight through. As a result the method has no effect 
      // and the connector will continue processing the
      // child elements of _JPO.

      if (input.containsKey("object_id"))
         output.put("object_ids", input.get("object_id"));

      if (input.containsKey("relationship_id"))
         output.put("relationship_ids", input.get("relationship_id"));

      return output;
   }
}

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