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https://issues.apache.org/jira/browse/OAK-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445716#comment-13445716
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Chetan Mehrotra commented on OAK-28:
------------------------------------
A minor fix is required in {{OsgiIndexProvider}} at Line 87
{code}
- return providers.get(0).getQueryIndexes(mk);
+ return providers.entrySet().iterator().next().getValue().getQueryIndexes(mk);
{code}
Could not find a better way to get the only value entry. One other way can be
to use NavigableMap
{code}
- private final Map<ServiceReference, QueryIndexProvider> providers =
- new HashMap<ServiceReference, QueryIndexProvider>();
+ private final NavigableMap<ServiceReference, QueryIndexProvider> providers =
+ new TreeMap<ServiceReference, QueryIndexProvider>();
{code}
And then
{code}
- return providers.get(0).getQueryIndexes(mk);
+ return providers.firstEntry().getValue().getQueryIndexes(mk);
{code}
> Query implementation
> --------------------
>
> Key: OAK-28
> URL: https://issues.apache.org/jira/browse/OAK-28
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: core, jcr
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Labels: query
> Attachments: OakToJcrQueryTreeConverter.java
>
>
> A query engine needs to be implemented.
> A query parser in oak-core should be able to handle xpath, sql2 and
> optionally other query languages. The jcr component must generate a valid
> query in one of those languages from JQOM queries and pass that statement
> along with value bindings, limit, offset, and name space mappings to the
> oak-core.
> We need to:
> * Define the oak-core API for handling queries. How are do we handle name
> space mappings, limit and offset
> * Implement a query builder in the jcr component which takes care of
> translating JQOM queries to statements in string form
> * Implement a query parser in oak-core and decide on a versatile AST
> representation which works with all query languages and which is extensible
> to future query languages.
> * Implement the actual query execution engine which interprets the query AST
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