jhplot.io.db

Class RecordsFile

java.lang.Object

jhplot.io.db.BaseRecordsFile

jhplot.io.db.RecordsFile

public class RecordsFile
extends BaseRecordsFile

Constructor Summary

Constructors

Constructor and Description
RecordsFile(String dbPath, int initialSize) Creates a new database file.
RecordsFile(String dbPath, String accessFlags) Opens an existing database and initializes the in-memory index.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the database.
Enumeration	enumerateKeys() Returns an enumeration of all the keys in the database.
int	getNumRecords() Returns the current number of records in the database.
boolean	recordExists(String key) Checks if there is a record belonging to the given key.

Methods inherited from class jhplot.io.db.BaseRecordsFile

deleteRecord, insertRecord, readRecord, updateRecord

Methods inherited from class java.lang.Object

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

Constructor Detail

RecordsFile

public RecordsFile(String dbPath,
                   int initialSize)
            throws IOException,
                   RecordsFileException

Creates a new database file. The initialSize parameter determines the amount of space which is allocated for the index. The index can grow dynamically, but the parameter is provide to increase efficiency.

Throws:

IOException

RecordsFileException

RecordsFile

public RecordsFile(String dbPath,
                   String accessFlags)
            throws IOException,
                   RecordsFileException

Opens an existing database and initializes the in-memory index.

Throws:

IOException

RecordsFileException

Method Detail

enumerateKeys

public Enumeration enumerateKeys()

Returns an enumeration of all the keys in the database.

Specified by:

enumerateKeys in class BaseRecordsFile

getNumRecords

public int getNumRecords()

Returns the current number of records in the database.

Specified by:

getNumRecords in class BaseRecordsFile

recordExists

public boolean recordExists(String key)

Checks if there is a record belonging to the given key.

Specified by:

recordExists in class BaseRecordsFile

close

public void close()
           throws IOException,
                  RecordsFileException

Closes the database.

Overrides:

close in class BaseRecordsFile

Throws:

IOException

RecordsFileException