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java.lang.Objectorg.apache.hadoop.hive.ql.util.jdbm.htree.HTree
public class HTree
Persistent hashtable implementation for PageManager. Implemented as an H*Tree structure. WARNING! If this instance is used in a transactional context, it *must* be discarded after a rollback.
Method Summary | |
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static HTree |
createInstance(RecordManager recman)
Create a persistent hashtable. |
Object |
get(Object key)
Returns the value which is associated with the given key. |
long |
getRecid()
Get the record identifier used to load this hashtable. |
FastIterator |
keys()
Returns an enumeration of the keys contained in this |
static HTree |
load(RecordManager recman,
long root_recid)
Load a persistent hashtable |
void |
put(Object key,
Object value)
Associates the specified value with the specified key. |
void |
remove(Object key)
Remove the value which is associated with the given key. |
FastIterator |
values()
Returns an enumeration of the values contained in this |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static HTree createInstance(RecordManager recman) throws IOException
recman
- Record manager used for persistence.
IOException
public static HTree load(RecordManager recman, long root_recid) throws IOException
recman
- RecordManager used to store the persistent hashtableroot_recid
- Record id of the root directory of the HTree
IOException
public void put(Object key, Object value) throws IOException
key
- key with which the specified value is to be assocated.value
- value to be associated with the specified key.
IOException
public Object get(Object key) throws IOException
null
if there is not association for this key.
key
- key whose associated value is to be returned
IOException
public void remove(Object key) throws IOException
key
- key whose associated value is to be removed
IOException
public FastIterator keys() throws IOException
IOException
public FastIterator values() throws IOException
IOException
public long getRecid()
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