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https://issues.apache.org/jira/browse/LUCENENET-170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667207#action_12667207
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Moray McConnachie commented on LUCENENET-170:
---------------------------------------------
Thanks. patchv2 works for me: and is beautifully short. Thanks for the quick
feedback., System.Runtime.Serialization.IObjectReference is new to me and
clearly very useful!
> BooleanClause serialization fails owing to issues with serializing Occur
> object
> -------------------------------------------------------------------------------
>
> Key: LUCENENET-170
> URL: https://issues.apache.org/jira/browse/LUCENENET-170
> Project: Lucene.Net
> Issue Type: Bug
> Reporter: Moray McConnachie
> Attachments: Parameter v2.patch, Parameter.patch
>
>
> 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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