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javax.mail.search
Class ComparisonTerm  

java.lang.Object
  javax.mail.search.SearchTerm
      javax.mail.search.ComparisonTerm

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

DateTerm, IntegerComparisonTerm

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public abstract class ComparisonTerm

extends SearchTerm

Base for comparison terms.

Version:

$Rev: 126550 $ $Date: 2005-01-26 14:27:45 -0800 (Wed, 26 Jan 2005) $

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Field Summary
protected  int	comparison
static int	EQ
static int	GE
static int	GT
static int	LE
static int	LT
static int	NE

 

Constructor Summary

ComparisonTerm()

 

Method Summary
boolean	equals(java.lang.Object other)           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 javax.mail.search.SearchTerm

match

 

Methods inherited from class java.lang.Object

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

 

Field Detail

LE

public static final int LE

See Also:

Constant Field Values

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LT

public static final int LT

See Also:

Constant Field Values

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EQ

public static final int EQ

See Also:

Constant Field Values

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NE

public static final int NE

See Also:

Constant Field Values

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GT

public static final int GT

See Also:

Constant Field Values

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GE

public static final int GE

See Also:

Constant Field Values

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comparison

protected int comparison

Constructor Detail

ComparisonTerm

public ComparisonTerm()

Method Detail

equals

public boolean equals(java.lang.Object other)

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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