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org.apache.commons.lang.time
Class FastDateFormat.TimeZoneDisplayKey  

java.lang.Object
  org.apache.commons.lang.time.FastDateFormat.TimeZoneDisplayKey

Enclosing class:

FastDateFormat

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private static class FastDateFormat.TimeZoneDisplayKey

extends java.lang.Object

Inner class that acts as a compound key for time zone names.

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Field Summary
private  java.util.Locale	mLocale
private  int	mStyle
private  java.util.TimeZone	mTimeZone

 

Constructor Summary
(package private)	FastDateFormat.TimeZoneDisplayKey(java.util.TimeZone timeZone, boolean daylight, int style, java.util.Locale locale)

 

Method Summary
boolean	equals(java.lang.Object obj)           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.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

mTimeZone

private final java.util.TimeZone mTimeZone

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mStyle

private final int mStyle

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mLocale

private final java.util.Locale mLocale

Constructor Detail

FastDateFormat.TimeZoneDisplayKey

FastDateFormat.TimeZoneDisplayKey(java.util.TimeZone timeZone,
                                  boolean daylight,
                                  int style,
                                  java.util.Locale locale)

Method Detail

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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equals

public 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.

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