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com.clra.member
Class Email  

java.lang.Object
  com.clra.member.Email

All Implemented Interfaces:

java.io.Serializable

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public class Email

extends java.lang.Object

implements java.io.Serializable

Encapsulates the email address of a member. This class performs rough validation of email addresses, in the spirit of RFC 821, but not to the letter of that specification. An email address is considered valid if it is of the form:

      "local" "@" "domain"
 

where the "local" part can be any combination of [a-zA-Z0-9.] that does not start with a digit or dot nor ends with a dot. (To be rigorous, the local part should exclude doubled dot sequences, and it should allow all escaped ASCII characters.) The "domain" part can be any combination of [-a-zA-Z09.] that does not start with a digit, hyphen or dot, and that does not end with a hyphen or dot. (To be rigorous, the domain part should exclude doubled dot or hyphen sequences, and it should allow dotted numeric addresses.)

Version:

$Id: Email.java,v 1.5 2003/03/01 00:45:14 rphall Exp $

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Field Summary
private  java.lang.String	email

 

Constructor Summary

Email(java.lang.String s)

 

Method Summary
boolean	equals(java.lang.Object o)           Determine whether this Object is semantically equal to another Object.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
static boolean	isValidDomainChar(char c)
static boolean	isValidEmail(java.lang.String s)
static boolean	isValidEnd(char c)
static boolean	isValidLocalChar(char c)
static boolean	isValidStart(char c)
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

email

private final java.lang.String email

Constructor Detail

Email

public Email(java.lang.String s)

Method Detail

isValidStart

public static boolean isValidStart(char c)

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isValidEnd

public static boolean isValidEnd(char c)

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isValidLocalChar

public static boolean isValidLocalChar(char c)

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isValidDomainChar

public static boolean isValidDomainChar(char c)

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isValidEmail

public static boolean isValidEmail(java.lang.String s)

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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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equals

public boolean equals(java.lang.Object o)

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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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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