org.apache.oodt.cas.product

Class CASProductHandler

java.lang.Object

org.apache.oodt.cas.product.CASProductHandler

All Implemented Interfaces:

LargeProductQueryHandler, QueryHandler

public class CASProductHandler
extends Object
implements LargeProductQueryHandler

Version:

$Revision$

Describe your class here

.

Author:

mattmann

Constructor Summary

Constructors

Constructor and Description
CASProductHandler()

Method Summary

Modifier and Type	Method and Description
void	close(String id) Close off a product.
XMLQuery	query(XMLQuery query) Run a query.
byte[]	retrieveChunk(String id, long offset, int length) Retrieve a chunk of a product.

Methods inherited from class java.lang.Object

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

Constructor Detail

CASProductHandler

public CASProductHandler()
                  throws MalformedURLException,
                         ConnectionException

Throws:

MalformedURLException

ConnectionException

Method Detail

query

public XMLQuery query(XMLQuery query)
               throws ProductException

Description copied from interface: QueryHandler

Run a query.

Specified by:

query in interface QueryHandler

Parameters:

query - The query.

Returns:

The response.

Throws:

ProductException - if an error occurs.

close

public void close(String id)

Description copied from interface: LargeProductQueryHandler

Close off a product. This method indicates that the product is no longer required and its resources can be freed by the query handler. If the ID is unknown, no untoward action is required. It should throw an exception if there is an error during the resource release (such as an IOException when closing a file.

Specified by:

close in interface LargeProductQueryHandler

Parameters:

id - Product ID.

retrieveChunk

public byte[] retrieveChunk(String id,
                            long offset,
                            int length)
                     throws ProductException

Description copied from interface: LargeProductQueryHandler

Retrieve a chunk of a product. The product is identified by a string ID. The query handler should return a binary chunk of the product using the given offset and length. If the ID isn't recognized, it should return null. It should throw an exception if retrieval fails for some reason.

Specified by:

retrieveChunk in interface LargeProductQueryHandler

Parameters:

id - Product ID.

offset - Where in the product to get a chunk of it.

length - How much of the product to get.

Returns:

A chunk, or null if the id is unknown.

Throws:

ProductException - if an error occurs.