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junit.samples.money
Class MoneyBag  

java.lang.Object
  junit.samples.money.MoneyBag

All Implemented Interfaces:

IMoney

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class MoneyBag

extends java.lang.Object

implements IMoney

A MoneyBag defers exchange rate conversions. For example adding 12 Swiss Francs to 14 US Dollars is represented as a bag containing the two Monies 12 CHF and 14 USD. Adding another 10 Swiss francs gives a bag with 22 CHF and 14 USD. Due to the deferred exchange rate conversion we can later value a MoneyBag with different exchange rates. A MoneyBag is represented as a list of Monies and provides different constructors to create a MoneyBag.

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Field Summary
private  java.util.Vector	fMonies

 

Constructor Summary
(package private)	MoneyBag()

 

Method Summary
IMoney	add(IMoney m)           Adds a money to this money.
IMoney	addMoney(Money m)           Adds a simple Money to this money.
IMoney	addMoneyBag(MoneyBag s)           Adds a MoneyBag to this money.
(package private)  void	appendBag(MoneyBag aBag)
(package private)  void	appendMoney(Money aMoney)
void	appendTo(MoneyBag m)           Append this to a MoneyBag m.
private  boolean	contains(Money m)
(package private) static IMoney	create(IMoney m1, IMoney m2)
boolean	equals(java.lang.Object anObject)           Determine whether this Object is semantically equal to another Object.
private  Money	findMoney(java.lang.String currency)
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
boolean	isZero()           Tests whether this money is zero
IMoney	multiply(int factor)           Multiplies a money by the given factor.
IMoney	negate()           Negates this money.
private  IMoney	simplify()
IMoney	subtract(IMoney m)           Subtracts a money from this money.
java.lang.String	toString()           Convert this Object to a human-readable String.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

fMonies

private java.util.Vector fMonies

Constructor Detail

MoneyBag

MoneyBag()

Method Detail

create

static IMoney create(IMoney m1,
                     IMoney m2)

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add

public IMoney add(IMoney m)

Description copied from interface: IMoney

Adds a money to this money.

Specified by:

add in interface IMoney

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addMoney

public IMoney addMoney(Money m)

Description copied from interface: IMoney

Adds a simple Money to this money. This is a helper method for implementing double dispatch

Specified by:

addMoney in interface IMoney

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addMoneyBag

public IMoney addMoneyBag(MoneyBag s)

Description copied from interface: IMoney

Adds a MoneyBag to this money. This is a helper method for implementing double dispatch

Specified by:

addMoneyBag in interface IMoney

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appendBag

void appendBag(MoneyBag aBag)

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appendMoney

void appendMoney(Money aMoney)

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equals

public boolean equals(java.lang.Object anObject)

Description copied from class: java.lang.Object

Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

• It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
• It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
• It must be reflexive. a.equals(a) must always be true.
• It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
• a.equals(null) must be false.
• It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a java.lang.ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a java.lang.NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, java.util.IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

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findMoney

private Money findMoney(java.lang.String currency)

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contains

private boolean contains(Money m)

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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isZero

public boolean isZero()

Description copied from interface: IMoney

Tests whether this money is zero

Specified by:

isZero in interface IMoney

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multiply

public IMoney multiply(int factor)

Description copied from interface: IMoney

Multiplies a money by the given factor.

Specified by:

multiply in interface IMoney

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negate

public IMoney negate()

Description copied from interface: IMoney

Negates this money.

Specified by:

negate in interface IMoney

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simplify

private IMoney simplify()

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subtract

public IMoney subtract(IMoney m)

Description copied from interface: IMoney

Subtracts a money from this money.

Specified by:

subtract in interface IMoney

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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appendTo

public void appendTo(MoneyBag m)

Description copied from interface: IMoney

Append this to a MoneyBag m.

Specified by:

appendTo in interface IMoney

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> junit >> samples >> [ money overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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