simpledb.remote
Class RemoteMetaDataImpl

java.lang.Object
  java.rmi.server.RemoteObject
      java.rmi.server.RemoteServer
          java.rmi.server.UnicastRemoteObject
              simpledb.remote.RemoteMetaDataImpl

All Implemented Interfaces:

Serializable, Remote, RemoteMetaData

public class RemoteMetaDataImpl
extends UnicastRemoteObject
implements RemoteMetaData

The RMI server-side implementation of RemoteMetaData.

Author:

Edward Sciore

See Also:

Serialized Form

Field Summary

Fields inherited from class java.rmi.server.RemoteObject

ref

Constructor Summary

RemoteMetaDataImpl(Schema sch)
Creates a metadata object that wraps the specified schema.

Method Summary

int	getColumnCount() Returns the size of the field list.
int	getColumnDisplaySize(int column) Returns the number of characters required to display the specified column.
String	getColumnName(int column) Returns the field name for the specified column number.
int	getColumnType(int column) Returns the type of the specified column.

Methods inherited from class java.rmi.server.UnicastRemoteObject

clone, exportObject, exportObject, exportObject, unexportObject

Methods inherited from class java.rmi.server.RemoteServer

getClientHost, getLog, setLog

Methods inherited from class java.rmi.server.RemoteObject

equals, getRef, hashCode, toString, toStub

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RemoteMetaDataImpl

public RemoteMetaDataImpl(Schema sch)
                   throws RemoteException

Creates a metadata object that wraps the specified schema. The method also creates a list to hold the schema's collection of field names, so that the fields can be accessed by position.

Parameters:

sch - the schema

Throws:

RemoteException

Method Detail

getColumnCount

public int getColumnCount()
                   throws RemoteException

Returns the size of the field list.

Specified by:

getColumnCount in interface RemoteMetaData

Throws:

RemoteException

See Also:

RemoteMetaData.getColumnCount()

getColumnName

public String getColumnName(int column)
                     throws RemoteException

Returns the field name for the specified column number. In JDBC, column numbers start with 1, so the field is taken from position (column-1) in the list.

Specified by:

getColumnName in interface RemoteMetaData

Throws:

RemoteException

See Also:

RemoteMetaData.getColumnName(int)

getColumnType

public int getColumnType(int column)
                  throws RemoteException

Returns the type of the specified column. The method first finds the name of the field in that column, and then looks up its type in the schema.

Specified by:

getColumnType in interface RemoteMetaData

Throws:

RemoteException

See Also:

RemoteMetaData.getColumnType(int)

getColumnDisplaySize

public int getColumnDisplaySize(int column)
                         throws RemoteException

Returns the number of characters required to display the specified column. For a string-type field, the method simply looks up the field's length in the schema and returns that. For an int-type field, the method needs to decide how large integers can be. Here, the method arbitrarily chooses 6 characters, which means that integers over 999,999 will probably get displayed improperly.

Specified by:

getColumnDisplaySize in interface RemoteMetaData

Throws:

RemoteException

See Also:

RemoteMetaData.getColumnDisplaySize(int)