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org.jdaemon.era.sql
Class GroupAggregatingIterator  

java.lang.Object
  org.jdaemon.util.iterator.AggregatingIterator
      org.jdaemon.era.sql.GroupAggregatingIterator

All Implemented Interfaces:

java.util.Iterator

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class GroupAggregatingIterator

extends org.jdaemon.util.iterator.AggregatingIterator

Iterator that will group data into Cubes. This is a package-level class because it is heavily dependent on certain implementation details of SQLCube and JavaCube, so not generally suitable for use elsewhere.

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Nested Class Summary
private static class	GroupAggregatingIterator.GroupComparator           Comparator used to test the value of a common attribute contained by two data items.

 

Field Summary
(package private)  org.jdaemon.era.java.JavaCubeDescriptor	descriptor           Descriptor used both to access attribute values and to create new, empty cubes

 

Fields inherited from class org.jdaemon.util.iterator.AggregatingIterator

 

Constructor Summary

GroupAggregatingIterator(java.util.Iterator iterator, org.jdaemon.era.java.JavaCubeDescriptor descriptor, java.lang.String group_attribute, boolean ordered)           Generate a new GroupAggregatingIterator The resulting iterator will be over a set of cubes, where each cube contains data items sharing a common value of group_attribute

 

Method Summary
protected  java.lang.Object	addToGroup(java.lang.Object group, java.lang.Object value)           Add given data item to a cube
protected  java.lang.Object	beginGroup()           Create a new, empty cube to which data will be added

 

Methods inherited from class org.jdaemon.util.iterator.AggregatingIterator

hasNext, next, remove

 

Methods inherited from class java.lang.Object

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

 

Field Detail

descriptor

org.jdaemon.era.java.JavaCubeDescriptor descriptor

Descriptor used both to access attribute values and to create new, empty cubes

Constructor Detail

GroupAggregatingIterator

public GroupAggregatingIterator(java.util.Iterator iterator,
                                org.jdaemon.era.java.JavaCubeDescriptor descriptor,
                                java.lang.String group_attribute,
                                boolean ordered)

Generate a new GroupAggregatingIterator The resulting iterator will be over a set of cubes, where each cube contains data items sharing a common value of group_attribute

Method Detail

addToGroup

protected java.lang.Object addToGroup(java.lang.Object group,
                                      java.lang.Object value)

Add given data item to a cube

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beginGroup

protected java.lang.Object beginGroup()

Create a new, empty cube to which data will be added

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> jdaemon >> era >> [ sql overview ]	PREV CLASS  NEXT CLASS
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