uk.ac.ic.doc.rodex.qproc
Class QueryResultProducer

java.lang.Object
  uk.ac.ic.doc.rodex.qproc.QueryResultProducer

public class QueryResultProducer
extends java.lang.Object

Constructor Summary

QueryResultProducer(java.util.List asgResults)
Creates a new instance of QueryResultProducer

Method Summary

static java.util.List	getAllTuples(ASG asg) Loop through the entire ASG list-type structure and covert its content into an List of rows, each row is a List object containing all tuple values .
java.lang.String	getIQLString() Convert the result set into IQL's string for display
static java.lang.StringBuffer	getIQLString(java.util.List tuples) Return a String representation of a list of ASG tuples
java.util.List	join() Perform the 'join' operation on the specified set of result objects.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryResultProducer

public QueryResultProducer(java.util.List asgResults)

Creates a new instance of QueryResultProducer

Method Detail

join

public java.util.List join()
                    throws QueryResultException

Perform the 'join' operation on the specified set of result objects.

The steps for joining are:

• Start with a result object, loop through its list of tuples
• For each tuple, get all corresponding tuples in other result objects
• Ignore the value (constant) at a specific tuple's column if is duplicated by other tuples
  If the value is otherwise distinct, add it to the tuple as a new column
• After finished joining each tuple, re-organise its values so that they appear
  in the exact same order as specified by the query head variables
• Continue with other tuples

Returns:

List tuples constructed from joining result objects' tuples

Throws:

QueryResultException

getIQLString

public java.lang.String getIQLString()

Convert the result set into IQL's string for display

getIQLString

public static java.lang.StringBuffer getIQLString(java.util.List tuples)

Return a String representation of a list of ASG tuples

getAllTuples

public static java.util.List getAllTuples(ASG asg)

Loop through the entire ASG list-type structure and covert its content into an List of rows, each row is a List object containing all tuple values
.

Parameters:

asg - the actual ASG object

Returns:

List the apply {@link List) of the start of the tuple