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/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.i18n.client.impl;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import java.util.ArrayList;
import java.util.Iterator;
/**
* Generated class containing all the CurrencyImpl instances. This is just
* the fallback in case the I18N module is not included.
*/
public class CurrencyList implements Iterable<CurrencyData> {
/**
* Inner class to avoid CurrencyList.clinit calls and allow this to be
* completely removed from the generated code if instance isn't referenced
* (such as when all you call is CurrencyList.get().getDefault() ).
*/
private static class CurrencyListInstance {
private static CurrencyList instance = GWT.create(CurrencyList.class);
}
/**
* Return the singleton instance of CurrencyList.
*/
public static CurrencyList get() {
return CurrencyListInstance.instance;
}
/**
* JS Object which contains a map of currency codes to CurrencyData
* objects. Each currency code is prefixed with a ':' to allow
* enumeration to find only the values we added, and not values
* which various JSVMs add to objects.
*/
protected JavaScriptObject dataMap;
/**
* JS Object which contains a map of currency codes to localized
* currency names. This is kept separate from the CurrencyData
* map above so that the names can be completely removed by the
* compiler if they are not used. As iteration is not required,
* no prefix is added to currency codes in this map.
*/
protected JavaScriptObject namesMap;
/**
* Return the default currency data for this locale.
*
* Generated implementations override this method.
*/
public native CurrencyData getDefault() /*-{
return [ "USD", "$", 2, "US$" ];
}-*/;
/**
* Returns an iterator for the list of currencies.
*/
public final Iterator<CurrencyData> iterator() {
ensureCurrencyMap();
ArrayList<String> keys = new ArrayList<String>();
loadCurrencyKeys(keys);
final Iterator<String> it = keys.iterator();
return new Iterator<CurrencyData>() {
public boolean hasNext() {
return it.hasNext();
}
public CurrencyData next() {
return getEntry(it.next());
}
public void remove() {
throw new UnsupportedOperationException("Remove not supported");
}
};
}
/**
* Lookup a currency based on the ISO4217 currency code.
*
* @param currencyCode ISO4217 currency code
* @return currency data, or null if code not found
*/
public final CurrencyData lookup(String currencyCode) {
ensureCurrencyMap();
return getEntry(currencyCode);
}
/**
* Lookup a currency name based on the ISO4217 currency code.
*
* @param currencyCode ISO4217 currency code
* @return name of the currency, or null if code not found
*/
public final String lookupName(String currencyCode) {
ensureNamesMap();
return getNamesEntry(currencyCode);
}
/**
* Ensure that the map of currency data has been initialized.
*/
protected final void ensureCurrencyMap() {
if (dataMap == null) {
loadCurrencyMap();
}
}
/**
* Ensure that the map of currency data has been initialized.
*/
protected final void ensureNamesMap() {
if (namesMap == null) {
loadNamesMap();
}
}
/**
* Directly reference an entry in the currency map JSO.
*
* @param code ISO4217 currency code
* @return currency data
*/
protected final native CurrencyData getEntry(String code) /*-{
return this.@com.google.gwt.i18n.client.impl.CurrencyList::dataMap[':' + code];
}-*/;
/**
* Directly reference an entry in the currency names map JSO.
*
* @param code ISO4217 currency code
* @return currency name
*/
protected final native String getNamesEntry(String code) /*-{
return this.@com.google.gwt.i18n.client.impl.CurrencyList::namesMap[code] || code;
}-*/;
/**
* Loads the currency map from a JS object literal.
*
* Generated implementations override this method.
*/
protected native void loadCurrencyMap() /*-{
this.@com.google.gwt.i18n.client.impl.CurrencyList::dataMap = {
":USD": [ "USD", "$", 2 ],
":EUR": [ "EUR", "€", 2 ],
":GBP": [ "GBP", "UK£", 2 ],
":JPY": [ "JPY", "¥", 0 ],
};
}-*/;
/**
* Loads the currency names map from a JS object literal.
*
* Generated implementations override this method.
*/
protected native void loadNamesMap() /*-{
this.@com.google.gwt.i18n.client.impl.CurrencyList::namesMap = {
"USD": "US Dollar",
"EUR": "Euro",
"GBP": "British Pound Sterling",
"JPY": "Japanese Yen",
};
}-*/;
/**
* Add currency codes contained in the map to an ArrayList.
*/
private native void loadCurrencyKeys(ArrayList<String> keys) /*-{
var map = this.@com.google.gwt.i18n.client.impl.CurrencyList::dataMap;
for (var key in map) {
if (key.charCodeAt(0) == 58) {
keys.@java.util.ArrayList::add(Ljava/lang/Object;)(key.substring(1));
}
}
}-*/;
}