org.ahmadsoft.postal
Class DiskStrategy

java.lang.Object
  org.ahmadsoft.postal.DiskStrategy

All Implemented Interfaces:

PostalRetrievalStrategy

public class DiskStrategy
extends java.lang.Object
implements PostalRetrievalStrategy

A retrieval strategy that looks up from disk every time. There is almost no reason to use this strategy except in an interactive program because, due to the fact that lookups are synchronized, and that every lookup results in a disk access, its time characteristics are very poor. However, its space requirements are constant.

Author:

Amin Ahmad

Constructor Summary

DiskStrategy()

Method Summary

void	dispose()
java.util.List	getCandidates(int postalCode) Retrieves a list of candidate cities for a specified postal code.
void	initialize(java.io.File _indexFile, java.io.File _dataFile) Initializes the retrieval strategy with the postal code index and data files.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiskStrategy

public DiskStrategy()

Method Detail

initialize

public void initialize(java.io.File _indexFile,
                       java.io.File _dataFile)
                throws java.lang.Exception

Description copied from interface: PostalRetrievalStrategy

Initializes the retrieval strategy with the postal code index and data files.

Specified by:

initialize in interface PostalRetrievalStrategy

Throws:

java.lang.Exception

getCandidates

public java.util.List getCandidates(int postalCode)

Description copied from interface: PostalRetrievalStrategy

Retrieves a list of candidate cities for a specified postal code.

Specified by:

getCandidates in interface PostalRetrievalStrategy

Parameters:

postalCode - the postal code.

Returns:

a list of candidate cities.

dispose

public void dispose()
             throws java.lang.Exception

Specified by:

dispose in interface PostalRetrievalStrategy

Throws:

java.lang.Exception