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https://issues.apache.org/jira/browse/LUCENE-4890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615472#comment-13615472
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Philip Searle commented on LUCENE-4890:
---------------------------------------
The issue appears to be due to the code that walks the query node's class
hierarchy incorrectly getting the list of implemented interfaces from the
most-derived class, instead of the class currently being processed.
It can be fixed by changing the following line in QueryTreeBuilder.java from:
{{Class<?>[] classes = node.getClass().getInterfaces();}}
to:
{{Class<?>[] classes = clazz.getInterfaces();}}
> QueryTreeBuilder.getBuilder() only finds interfaces on the most derived class
> -----------------------------------------------------------------------------
>
> Key: LUCENE-4890
> URL: https://issues.apache.org/jira/browse/LUCENE-4890
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: 3.3
> Environment: Lucene 3.3.0 on Win32
> Reporter: Philip Searle
> Priority: Minor
>
> QueryBuilder implementations registered with QueryTreeBuilder.setBuilder()
> are not recognized by QueryTreeBuilder.getBuilder() if they are registered
> for an interface implemented by a superclass. Registering them for a concrete
> query node class or an interface implemented by the most-derived class do
> work.
> {code:title=example.java|borderStyle=solid}
> /* Our custom query builder */
> class CustomQueryTreeBuilder extends QueryTreeBuilder {
> public CustomQueryTreeBuilder() {
> /* Turn field:"value" into an application-specific object */
> setBuilder(FieldQueryNode.class, new QueryBuilder() {
> @Override
> public Object build(QueryNode queryNode) {
> FieldQueryNode node = (FieldQueryNode) queryNode;
> return new ApplicationSpecificClass(node.getFieldAsString());
> }
> });
> /* Ignore all other query node types */
> setBuilder(QueryNode.class, new QueryBuilder() {
> @Override
> public Object build(QueryNode queryNode) {
> return null;
> }
> });
> }
> }
> /* Assume this is in the main program: */
> StandardQueryParser queryParser = new StandardQueryParser();
> queryParser.setQueryBuilder(new CustomQueryTreeBuilder());
> /* The following line will throw an exception because it can't find a builder
> for BooleanQueryNode.class */
> Object queryObject = queryParser.parse("field:\"value\" field2:\"value2\"",
> "field");
> {code}
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