uk.ac.ed.epcc.webapp.model.data

Class RangeSearch<D extends DataObject>

java.lang.Object

uk.ac.ed.epcc.webapp.model.data.RangeSearch<D>

public class RangeSearch<D extends DataObject>
extends java.lang.Object

Search for an integer id from a range which is not allocated to any record from a table. This is used to allocate un-used id values. It will default to allocating bottom to top but will attempt to fill in gaps once the top value is reached.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RangeSearch.Info
class	RangeSearch.InfoFinder
class	RangeSearch.InfoMapper

Constructor Summary

Constructors

Constructor and Description
RangeSearch(DataObjectFactory<D> fac, java.lang.String field)

Method Summary

Modifier and Type	Method and Description
long	search(long min, long max) search for a positive id value not used by any record in the repository

Methods inherited from class java.lang.Object

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

Constructor Detail

RangeSearch

public RangeSearch(DataObjectFactory<D> fac,
                   java.lang.String field)

Method Detail

search

public long search(long min,
                   long max)
            throws DataException

search for a positive id value not used by any record in the repository

Parameters:

min - minimum legal value (inclusive)

max - maximum legal value (inclusive)

Returns:

un-allocated id or -1;

Throws:

DataException