Philip Searle created LUCENE-4890:
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Summary: 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.
/* An example: */
/* 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");
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