BooleanClause serialization fails owing to issues with serializing Occur object
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Key: LUCENENET-170
URL: https://issues.apache.org/jira/browse/LUCENENET-170
Project: Lucene.Net
Issue Type: Bug
Reporter: Moray McConnachie
Essentially when you serialize a BooleanClause you lose all Occurs objects, so
you cannot meaningfully serialize and deserialize BooleanQuery s with multiple
clauses unless they all use the default Occur.SHOULD
I suspect this bug extends to all objects depending on Parameter object, making
it impossible to serialize and deserialize objects which include members
inheriting from Parameter.
I don't know enough about how the Parameter object ought to work or is used
elsewhere to attempt a fix. I have a hack which works for my app by
intercepting Serialize and Deserialize and serializing the occur member of
BooleanClause to a string and Deserializing it the same way, but this is deeply
suboptimal.
Here is some test code for a Console application. Sorry about the formatting,
this bug tracker seems not to like it too much.
If the two queries don't match the bug is still in evidence.
----
{{
using System;\\
using System.Collections.Generic;\\
using System.IO;\\
using System.Linq;\\
using System.Runtime.Serialization.Formatters.Binary;\\
using System.Text;\\
using Lucene.Net.Search;\\
namespace TestSerialization
{
class Program
{
static void Main(string[] args)
{
//build our sample query
BooleanQuery queryPreSerialized = new BooleanQuery();
queryPreSerialized.Add(new TermQuery(new
Lucene.Net.Index.Term("country","Russia")),BooleanClause.Occur.MUST);
queryPreSerialized.Add(new TermQuery(new
Lucene.Net.Index.Term("country","France")),BooleanClause.Occur.MUST);
Console.WriteLine("Query pre serialisation: " +
queryPreSerialized.ToString());
//now serialize it
BinaryFormatter serializer = new BinaryFormatter();
MemoryStream memoryStream = new MemoryStream();
serializer.Serialize(memoryStream, queryPreSerialized);
//now deserialize
memoryStream.Seek(0, SeekOrigin.Begin);
BooleanQuery queryPostSerialized =
(BooleanQuery)serializer.Deserialize(memoryStream);
Console.WriteLine("Query post deserialization: "+
queryPostSerialized.ToString());
if (!queryPreSerialized.Equals(queryPostSerialized))
Console.WriteLine("Serialized and deserialized do not match -
down to issues with the way Parameter objects (in BooleanClause.Occur are
maintained");
memoryStream.Close();
Console.WriteLine("press enter to close");
Console.Read();
}\\
}\\
}\\
}}
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