currency.java

java与windows的com桥,可以用来操作所有的com程序如word或者excel等

package com.jacob.com;

/**
 * Most COM bridges use java.lang.Long as their Java data type for COM Currency
 * data. This is because COM currency is a 64 bit number where the last 4 digits
 * represent the milli-cents. We wanted to support 64 bit Long values for x64
 * platforms so that meant we wanted to map Java.LONG to COM.LONG even though it
 * only works for 64 bit platforms. The end result was we needed a new
 * representation for Money so we have this.
 * <p>
 * In the future, this should convert to and from BigDecimal or Double
 */
public class Currency {
	Long embeddedValue = null;

	/**
	 * constructor that takes a long already in COM representation
	 * 
	 * @param newValue
	 */
	public Currency(long newValue) {
		embeddedValue = new Long(newValue);
	}

	/**
	 * constructor that takes a String already in COM representation
	 * 
	 * @param newValue
	 */
	public Currency(String newValue) {
		embeddedValue = new Long(newValue);
	}

	/**
	 * 
	 * @return the currency as a primitive long
	 */
	public long longValue() {
		return embeddedValue.longValue();
	}

	/**
	 * getter to the inner storage so that cmpareTo can work
	 * 
	 * @return the embedded long value
	 */
	protected Long getLongValue() {
		return embeddedValue;
	}

	/**
	 * compares the values of two currencies
	 * 
	 * @param anotherCurrency
	 * @return the usual compareTo results
	 */
	public int compareTo(Currency anotherCurrency) {
		return embeddedValue.compareTo(anotherCurrency.getLongValue());
	}

	/**
	 * standard comparison
	 * 
	 * @param o
	 *            must be Currency or Long
	 * @return the usual compareTo results
	 */
	public int compareTo(Object o) {
		if (o instanceof Currency) {
			return compareTo((Currency) o);
		} else if (o instanceof Long) {
			return embeddedValue.compareTo((Long) o);
		} else
			throw new IllegalArgumentException(
					"Can only compare to Long and Currency not "
							+ o.getClass().getName());
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean equals(Object o) {
		if (o == null) {
			return false;
		} else if (compareTo(o) == 0) {
			return true;
		} else {
			return false;
		}
	}
}