org.hsqldb.store
Class ValuePoolHashMap

java.lang.Object
  org.hsqldb.store.BaseHashMap
      org.hsqldb.store.ValuePoolHashMap

public class ValuePoolHashMap

extends BaseHashMap

To Do:

fredt - check accessCount and reset on each getOrAddXXX()

Nested Class Summary

Nested classes inherited from class org.hsqldb.store.BaseHashMap

BaseHashMap.BaseHashIterator

Field Summary

Fields inherited from class org.hsqldb.store.BaseHashMap

hashIndex, intKeyOrValue, intKeyTable, intValueTable, longKeyOrValue, longKeyTable, longValueTable, NO_PURGE, noKeyOrValue, objectKeyOrValue, objectKeyTable, objectValueTable, PURGE_ALL, PURGE_HALF, PURGE_QUARTER, purgePolicy

Constructor Summary

ValuePoolHashMap(int initialCapacity, int maxCapacity, int purgePolicy)

Method Summary

protected Date	getOrAddDate(long longKey)
protected Double	getOrAddDouble(long longKey)
protected Integer	getOrAddInteger(int intKey)
protected Long	getOrAddLong(long longKey)
protected Object	getOrAddObject(Object key)
protected String	getOrAddString(Object key) This is dissimilar to normal hash map get() methods.
void	resetCapacity(int maxCapacity, int purgePolicy)

Methods inherited from class org.hsqldb.store.BaseHashMap

addOrRemove, clear, clear, containsKey, containsKey, containsKey, containsValue, getLookup, getLookup, getLookup, getObject, getObject, getObject, isEmpty, rehash, removeLookup, removeObject, removeRow, reset, size

Methods inherited from class java.lang.Object

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

Constructor Detail

ValuePoolHashMap

public ValuePoolHashMap(int initialCapacity,
                        int maxCapacity,
                        int purgePolicy)
                 throws IllegalArgumentException

Method Detail

resetCapacity

public void resetCapacity(int maxCapacity,
                          int purgePolicy)
                   throws IllegalArgumentException

Throws:

IllegalArgumentException

getOrAddInteger

protected Integer getOrAddInteger(int intKey)

getOrAddLong

protected Long getOrAddLong(long longKey)

getOrAddString

protected String getOrAddString(Object key)

This is dissimilar to normal hash map get() methods. The key Object should have an equals(String) method which should return true if the key.toString.equals(String) is true. Also the key.hashCode() method must return the same value as key.toString.hashCode().

The above is always true when the key is a String. But it means it is possible to submit special keys that fulfill the contract. For example a wrapper around a byte[] can be submitted as key to retrieve either a new String, which is the toString() method of the wrapper, or return an existing String which would be equal to the product of toString().

Parameters:

key - String or other Object with compatible equals(String) and hashCode().

Returns:

String from map or a new String

getOrAddDate

protected Date getOrAddDate(long longKey)

getOrAddDouble

protected Double getOrAddDouble(long longKey)

getOrAddObject

protected Object getOrAddObject(Object key)