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org.apache.axis.constants
Class Enum  view Enum download Enum.java

java.lang.Object
  extended byorg.apache.axis.constants.Enum
All Implemented Interfaces:
java.io.Serializable
Direct Known Subclasses:
Scope, Style, Use

public abstract class Enum
extends java.lang.Object
implements java.io.Serializable

General support for 'enumerated' data types. Name searches are case insensitive.


Nested Class Summary
static class Enum.Type
           
 
Field Summary
protected static org.apache.commons.logging.Log log
           
 java.lang.String name
           
private  Enum.Type type
           
private static java.util.Hashtable types
           
 int value
           
 
Constructor Summary
protected Enum(Enum.Type type, int value, java.lang.String name)
           
 
Method Summary
private  boolean _equals(Enum obj)
          The 'equals' logic assumes that there is a one-to-one relationship between value & name.
 boolean equals(Enum obj)
           
 boolean equals(java.lang.Object obj)
          Determine whether this Object is semantically equal to another Object.
 java.lang.String getName()
           
 Enum.Type getType()
           
 int getValue()
           
 int hashCode()
          Get a value that represents this Object, as uniquely as possible within the confines of an int.
 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

types

private static final java.util.Hashtable types

log

protected static org.apache.commons.logging.Log log

type

private final Enum.Type type

value

public final int value

name

public final java.lang.String name
Constructor Detail

Enum

protected Enum(Enum.Type type,
               int value,
               java.lang.String name)
Method Detail

getValue

public final int getValue()

getName

public final java.lang.String getName()

getType

public final Enum.Type getType()

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()).


equals

public final boolean equals(java.lang.Object obj)
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.


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)


equals

public final boolean equals(Enum obj)

_equals

private final boolean _equals(Enum obj)
The 'equals' logic assumes that there is a one-to-one relationship between value & name. If this isn't true, then expect to be confused when using this class with Collections.