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org.apache.derby.impl.sql.catalog
Class TableKey  

java.lang.Object
  org.apache.derby.impl.sql.catalog.TableKey

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final class TableKey

extends java.lang.Object

A TableKey represents a immutable unique identifier for a SQL object. It has a schemaid and a name .

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Field Summary
private  org.apache.derby.catalog.UUID	schemaId
private  java.lang.String	tableName

 

Constructor Summary
(package private)	TableKey(org.apache.derby.catalog.UUID schemaUUID, java.lang.String tableName)           Constructor for when you have both the table and schema names.

 

Method Summary
boolean	equals(java.lang.Object otherTableKey)           2 TableKeys are equal if their both their schemaIds and tableNames are equal.
(package private)  org.apache.derby.catalog.UUID	getSchemaId()           Get the schema id.
(package private)  java.lang.String	getTableName()           Get the table name (without the schema name).
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

tableName

private final java.lang.String tableName

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schemaId

private final org.apache.derby.catalog.UUID schemaId

Constructor Detail

TableKey

TableKey(org.apache.derby.catalog.UUID schemaUUID,
         java.lang.String tableName)

Constructor for when you have both the table and schema names.

Method Detail

getTableName

java.lang.String getTableName()

Get the table name (without the schema name).

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getSchemaId

org.apache.derby.catalog.UUID getSchemaId()

Get the schema id.

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equals

public boolean equals(java.lang.Object otherTableKey)

2 TableKeys are equal if their both their schemaIds and tableNames are equal.

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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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