BuildableCurrencyUnit.java

/*
 * Copyright (c) 2012, 2016, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.
 *
 * 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 org.javamoney.moneta;

import javax.money.*;

import java.io.Serializable;
import java.util.Objects;

/**
 * Implementation of {@link javax.money.CurrencyUnit} that allows to of new
 * instances using a fluent API. Instances created also can be added to the
 * {@link org.javamoney.moneta.internal.ConfigurableCurrencyUnitProvider}
 * singleton, which publishes the instances, so they are visible from the
 * {@link javax.money.Monetary} singleton.
 */
final class BuildableCurrencyUnit implements CurrencyUnit,
		Comparable<CurrencyUnit>, Serializable {

	/**
	 * serialVersionUID.
	 */
	private static final long serialVersionUID = -2389580389919492220L;
	/**
	 * The unique currency code.
	 */
	private String currencyCode;
	/**
	 * The (optional) numeric code.
	 */
	private int numericCode;
	/**
	 * The default fraction digits.
	 */
	private int defaultFractionDigits;
	/**
	 * THe currency's context.
	 */
	private javax.money.CurrencyContext currencyContext;

	/**
	 * Constructor, called from the Builder.
	 *
	 * @param builder
	 *            the builder, never null.
	 */
	BuildableCurrencyUnit(CurrencyUnitBuilder builder) {
		Objects.requireNonNull(builder.currencyCode, "currencyCode required");
		if (builder.numericCode < -1) {
			throw new MonetaryException("numericCode must be >= -1");
		}
		if (builder.defaultFractionDigits < 0) {
			throw new MonetaryException("defaultFractionDigits must be >= 0");
		}
		if (builder.currencyContext == null) {
			throw new MonetaryException("currencyContext must be != null");
		}
		this.defaultFractionDigits = builder.defaultFractionDigits;
		this.numericCode = builder.numericCode;
		this.currencyCode = builder.currencyCode;
		this.currencyContext = builder.currencyContext;
	}

	@Override
	public String getCurrencyCode() {
		return currencyCode;
	}

	@Override
	public int getNumericCode() {
		return numericCode;
	}

	@Override
	public int getDefaultFractionDigits() {
		return defaultFractionDigits;
	}

	@Override
	public CurrencyContext getContext() {
		return currencyContext;
	}

	@Override
	public int compareTo(CurrencyUnit o) {
		Objects.requireNonNull(o);
		return this.currencyCode.compareTo(o.getCurrencyCode());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode() {
		return Objects.hashCode(currencyCode);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj == this) {
			return true;
		}
		if (obj instanceof CurrencyUnit) {
			CurrencyUnit other = (CurrencyUnit) obj;
			return Objects.equals(getCurrencyCode(), other.getCurrencyCode());
		}
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return "BuildableCurrencyUnit(currencyCode=" + currencyCode
				+ ", numericCode=" + numericCode + ", defaultFractionDigits="
				+ defaultFractionDigits + ", context=" + this.currencyContext
				+ ')';
	}

}