org.apache.solr.schema

Class OpenExchangeRatesOrgProvider

java.lang.Object

org.apache.solr.schema.OpenExchangeRatesOrgProvider

All Implemented Interfaces:

ExchangeRateProvider

public class OpenExchangeRatesOrgProvider
extends Object
implements ExchangeRateProvider

Exchange Rates Provider for CurrencyField and CurrencyFieldType capable of fetching & parsing the freely available exchange rates from openexchangerates.org

Configuration Options:

• ratesFileLocation - A file path or absolute URL specifying the JSON data to load (mandatory)
• refreshInterval - How frequently (in minutes) to reload the exchange rate data (default: 1440)

Disclaimer: This data is collected from various providers and provided free of charge for informational purposes only, with no guarantee whatsoever of accuracy, validity, availability or fitness for any purpose; use at your own risk. Other than that - have fun, and please share/watch/fork if you think data like this should be free!

See Also:

openexchangerates.org JSON Data Format

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	DEFAULT_REFRESH_INTERVAL
protected static String	PARAM_RATES_FILE_LOCATION
protected static String	PARAM_REFRESH_INTERVAL
protected org.apache.solr.schema.OpenExchangeRatesOrgProvider.OpenExchangeRates	rates
protected String	ratesFileLocation
protected int	refreshIntervalSeconds
protected ResourceLoader	resourceLoader

Constructor Summary

Constructors

Constructor and Description
OpenExchangeRatesOrgProvider()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
double	getExchangeRate(String sourceCurrencyCode, String targetCurrencyCode) Returns the currently known exchange rate between two currencies.
int	hashCode()
void	inform(ResourceLoader loader) Passes a ResourceLoader, used to read config files from e.g.
void	init(Map<String,String> params) Initializes the provider by passing in a set of key/value configs as a map.
Set<String>	listAvailableCurrencies() List all configured currency codes which are valid as source/target for this Provider
boolean	reload() Ask the currency provider to explicitly reload/refresh its configuration.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

PARAM_RATES_FILE_LOCATION

protected static final String PARAM_RATES_FILE_LOCATION

See Also:

Constant Field Values

PARAM_REFRESH_INTERVAL

protected static final String PARAM_REFRESH_INTERVAL

See Also:

Constant Field Values

DEFAULT_REFRESH_INTERVAL

protected static final String DEFAULT_REFRESH_INTERVAL

See Also:

Constant Field Values

ratesFileLocation

protected String ratesFileLocation

refreshIntervalSeconds

protected int refreshIntervalSeconds

resourceLoader

protected ResourceLoader resourceLoader

rates

protected org.apache.solr.schema.OpenExchangeRatesOrgProvider.OpenExchangeRates rates

Constructor Detail

OpenExchangeRatesOrgProvider

public OpenExchangeRatesOrgProvider()

Method Detail

getExchangeRate

public double getExchangeRate(String sourceCurrencyCode,
                              String targetCurrencyCode)

Returns the currently known exchange rate between two currencies. The rates are fetched from the freely available OpenExchangeRates.org JSON, hourly updated. All rates are symmetrical with base currency being USD by default.

Specified by:

getExchangeRate in interface ExchangeRateProvider

Parameters:

sourceCurrencyCode - The source currency being converted from.

targetCurrencyCode - The target currency being converted to.

Returns:

The exchange rate.

Throws:

SolrException - if the requested currency pair cannot be found

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

listAvailableCurrencies

public Set<String> listAvailableCurrencies()

Description copied from interface: ExchangeRateProvider

List all configured currency codes which are valid as source/target for this Provider

Specified by:

listAvailableCurrencies in interface ExchangeRateProvider

Returns:

a Set of ISO 4217 currency code strings

reload

public boolean reload()
               throws SolrException

Description copied from interface: ExchangeRateProvider

Ask the currency provider to explicitly reload/refresh its configuration. If this does not make sense for a particular provider, simply do nothing

Specified by:

reload in interface ExchangeRateProvider

Returns:

true if reload of rates succeeded, else false

Throws:

SolrException - if there is a problem reloading

init

public void init(Map<String,String> params)
          throws SolrException

Description copied from interface: ExchangeRateProvider

Initializes the provider by passing in a set of key/value configs as a map. Note that the map also contains other fieldType parameters, so make sure to avoid name clashes.

Important: Custom config params must be removed from the map before returning

Specified by:

init in interface ExchangeRateProvider

Parameters:

params - a @Map of key/value config params to initialize the provider

Throws:

SolrException

inform

public void inform(ResourceLoader loader)
            throws SolrException

Description copied from interface: ExchangeRateProvider

Passes a ResourceLoader, used to read config files from e.g. ZooKeeper. Implementations not needing resource loader can implement this as NOOP.

Typically called after init

Specified by:

inform in interface ExchangeRateProvider

Parameters:

loader - a @ResourceLoader instance

Throws:

SolrException