From: Vivek Mishra
Sent: Friday, June 17, 2011 3:25 PM
To: user@cassandra.apache.org
Subject: getFieldValue()
Hi,
I was looking into getFieldValue method for SuperColumn and SlicePredicate
apis.
It looks to me slight confusing as underlying APIs are returning Object and
developer can only be aware of type of object either by looking into Cassandra
code base or by ClassCastException.
For example,
I need to retrieve column name and it's value for a SuperColumnFamily
"SuperCli" is:
List<KeySlice> keySlices = cassndraClient.get_range_slices(new ColumnParent(
"SuperCli"), slicePredicate, keyRange,
ConsistencyLevel.ONE);
System.out.println(keySlices.size()
+ " No. of rows exist for the column family:" +
"SuperCli");
for( KeySlice slice :keySlices)
{
city = "noida";
System.out.println(new String((byte[])
(slice.getColumns().get(0).getSuper_column().getFieldValue(org.apache.cassandra.thrift.SuperColumn._Fields.NAME))).toString());
}
Am I doing something wrong or such typecasting is must? Shouldn't we hide this
complexity and handle it implicitly in CASSANDRA? Or may be introducing a
Helper Class can reduce such amount of code ?
Is it possible to retrieve a specific SuperColumn by specifying it's value in
SliceRange query?
I can't see any method with such search API and I believe it is a real time
scenario.
SuperCli is a super column family holding number of dynamic super columns.
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