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https://issues.apache.org/jira/browse/LUCENE-4890?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Philip Searle updated LUCENE-4890:
----------------------------------
Description:
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}
was:
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");
Improved example formatting.
> 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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