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Signed-off-by: Jan N. Klug <github@klug.nrw>
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84 changes: 84 additions & 0 deletions
84
....openhab.core/src/main/java/org/openhab/core/internal/library/unit/CurrencyConverter.java
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| /** | ||
| * Copyright (c) 2010-2023 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.core.internal.library.unit; | ||
|
|
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| import java.math.BigDecimal; | ||
| import java.math.MathContext; | ||
| import java.util.Objects; | ||
|
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| import javax.measure.UnitConverter; | ||
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| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
|
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| import tech.units.indriya.function.AbstractConverter; | ||
|
|
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| /** | ||
| * The {@link CurrencyConverter} is a | ||
| * | ||
| * @author Jan N. Klug - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public class CurrencyConverter extends AbstractConverter { | ||
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| private final BigDecimal factor; | ||
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| public CurrencyConverter(BigDecimal factor) { | ||
| this.factor = factor; | ||
| } | ||
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| @Override | ||
| public boolean equals(@Nullable Object cvtr) { | ||
| return cvtr instanceof CurrencyConverter currencyConverter && factor.equals(currencyConverter.factor); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hashCode(factor); | ||
| } | ||
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| @Override | ||
| protected @Nullable String transformationLiteral() { | ||
| return null; | ||
| } | ||
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| @Override | ||
| protected AbstractConverter inverseWhenNotIdentity() { | ||
| return new CurrencyConverter(BigDecimal.ONE.divide(factor, MathContext.DECIMAL128)); | ||
| } | ||
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| @Override | ||
| protected boolean canReduceWith(@Nullable AbstractConverter that) { | ||
| return false; | ||
| } | ||
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| @Override | ||
| protected Number convertWhenNotIdentity(@NonNullByDefault({}) Number value) { | ||
| return new BigDecimal(value.toString()).multiply(factor, MathContext.DECIMAL128); | ||
| } | ||
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| @Override | ||
| public int compareTo(@Nullable UnitConverter o) { | ||
| return o instanceof CurrencyConverter currencyConverter ? factor.compareTo(currencyConverter.factor) : -1; | ||
| } | ||
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| @Override | ||
| public boolean isIdentity() { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public boolean isLinear() { | ||
| return true; | ||
| } | ||
| } |
85 changes: 85 additions & 0 deletions
85
...rg.openhab.core/src/main/java/org/openhab/core/internal/library/unit/CurrencyService.java
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|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /** | ||
| * Copyright (c) 2010-2023 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.core.internal.library.unit; | ||
|
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| import static org.openhab.core.library.unit.CurrencyUnits.SYSTEM_CURRENCY; | ||
|
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| import java.math.BigDecimal; | ||
| import java.util.Set; | ||
| import java.util.concurrent.CopyOnWriteArraySet; | ||
| import java.util.function.Function; | ||
|
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| import javax.measure.Unit; | ||
|
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| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
| import org.openhab.core.library.dimension.Currency; | ||
| import org.openhab.core.library.unit.CurrencyProvider; | ||
| import org.openhab.core.library.unit.CurrencyUnit; | ||
| import org.openhab.core.library.unit.CurrencyUnits; | ||
| import org.osgi.framework.Constants; | ||
| import org.osgi.service.component.annotations.Activate; | ||
| import org.osgi.service.component.annotations.Component; | ||
| import org.osgi.service.component.annotations.Reference; | ||
| import org.osgi.service.component.annotations.ReferenceCardinality; | ||
| import org.osgi.service.component.annotations.ReferencePolicy; | ||
|
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| import tech.units.indriya.format.SimpleUnitFormat; | ||
|
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| /** | ||
| * The {@link CurrencyService} is a | ||
| * | ||
| * @author Jan N. Klug - Initial contribution | ||
| */ | ||
| @Component | ||
| @NonNullByDefault | ||
| public class CurrencyService { | ||
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| public static Function<Unit<Currency>, @Nullable BigDecimal> FACTOR_FCN = unit -> null; | ||
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| private final Set<CurrencyProvider> currencyProviders = new CopyOnWriteArraySet<>(); | ||
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| @Activate | ||
| public CurrencyService( | ||
| @Reference(target = "(" + Constants.SERVICE_PID + "=org.openhab.i18n)") CurrencyProvider currencyProvider) { | ||
| currencyProviders.add(currencyProvider); | ||
| enableProvider(currencyProvider); | ||
| } | ||
|
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| @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC) | ||
| public void addCurrencyProvider(CurrencyProvider currencyProvider) { | ||
| currencyProviders.add(currencyProvider); | ||
| } | ||
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| public void removeCurrencyProvider(CurrencyProvider currencyProvider) { | ||
| currencyProviders.remove(currencyProvider); | ||
| } | ||
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| private synchronized void enableProvider(CurrencyProvider currencyProvider) { | ||
| FACTOR_FCN = currencyProvider.getExchangeRateFunction(); | ||
| ((CurrencyUnit) SYSTEM_CURRENCY).setSymbol(currencyProvider.getBaseCurrency().getSymbol()); | ||
| ((CurrencyUnit) SYSTEM_CURRENCY).setName(currencyProvider.getBaseCurrency().getName()); | ||
| SimpleUnitFormat.getInstance().label(SYSTEM_CURRENCY, currencyProvider.getBaseCurrency().getSymbol()); | ||
| currencyProvider.getCurrencies().forEach(CurrencyUnits::addUnit); | ||
| } | ||
|
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| /** | ||
| * Get the exchange rate for a given currency to the system's base unit | ||
| * | ||
| * @param currency the currency | ||
| * @return the exchange rate | ||
| */ | ||
| public static @Nullable BigDecimal getConversionFactor(Unit<Currency> currency) { | ||
| return FACTOR_FCN.apply(currency); | ||
| } | ||
| } |
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26 changes: 26 additions & 0 deletions
26
bundles/org.openhab.core/src/main/java/org/openhab/core/library/dimension/Currency.java
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|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| /** | ||
| * Copyright (c) 2010-2023 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.core.library.dimension; | ||
|
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| import javax.measure.Quantity; | ||
|
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| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
|
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| /** | ||
| * The {@link Currency} is a | ||
| * | ||
| * @author Jan N. Klug - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public interface Currency extends Quantity<Currency> { | ||
| } |
66 changes: 66 additions & 0 deletions
66
bundles/org.openhab.core/src/main/java/org/openhab/core/library/unit/CurrencyProvider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /** | ||
| * Copyright (c) 2010-2023 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.core.library.unit; | ||
|
|
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| import java.math.BigDecimal; | ||
| import java.util.Collection; | ||
| import java.util.function.Function; | ||
|
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| import javax.measure.Unit; | ||
|
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| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
| import org.openhab.core.library.dimension.Currency; | ||
|
|
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| /** | ||
| * The {@link CurrencyProvider} can be implemented by services that supply currencies and their | ||
| * | ||
| * @author Jan N. Klug - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public interface CurrencyProvider { | ||
|
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| /** | ||
| * Get the name of this {@link CurrencyProvider} | ||
| * | ||
| * @return the name, defaults to the class name | ||
| */ | ||
| default String getName() { | ||
| return getClass().getName(); | ||
| } | ||
|
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| /** | ||
| * Get the base currency from this provider | ||
| * <p /> | ||
| * This currency is used as base for calculating exchange rates. | ||
| * | ||
| * @return the base currency of this provider | ||
| */ | ||
| Unit<Currency> getBaseCurrency(); | ||
|
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| /** | ||
| * Get all units that are supported by this provider | ||
| * | ||
| * @return a {@link Collection} of {@link Unit<Currency>}s | ||
| */ | ||
| Collection<Unit<Currency>> getCurrencies(); | ||
|
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| /** | ||
| * Get a {@link Function} that supplies exchanges rates for currencies supported by this provider | ||
| * <p /> | ||
| * This needs to be dynamic because in most cases exchange rates are not constant over time. | ||
| * | ||
| * @return the function | ||
| */ | ||
| Function<Unit<Currency>, @Nullable BigDecimal> getExchangeRateFunction(); | ||
| } |
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