.. java:import:: java.io Serializable

.. java:import:: java.sql CallableStatement

.. java:import:: java.sql Connection

.. java:import:: java.sql PreparedStatement

.. java:import:: java.sql ResultSet

.. java:import:: java.sql SQLException

.. java:import:: java.sql Statement

.. java:import:: java.sql Types

.. java:import:: java.util ArrayList

.. java:import:: java.util Arrays

.. java:import:: java.util HashMap

.. java:import:: java.util HashSet

.. java:import:: java.util Iterator

.. java:import:: java.util LinkedList

.. java:import:: java.util List

.. java:import:: java.util Map

.. java:import:: java.util Map.Entry

.. java:import:: java.util Set

.. java:import:: java.util UUID

.. java:import:: org.antlr.v4.runtime CharStreams

.. java:import:: org.antlr.v4.runtime CommonTokenStream

.. java:import:: org.apache.commons.jcs.access.behavior ICacheAccess

.. java:import:: org.apache.shiro.subject Subject

.. java:import:: org.caosdb.api.entity.v1 MessageCode

.. java:import:: org.caosdb.datetime UTCDateTime

.. java:import:: org.caosdb.server CaosDBServer

.. java:import:: org.caosdb.server ServerProperties

.. java:import:: org.caosdb.server.accessControl Principal

.. java:import:: org.caosdb.server.caching Cache

.. java:import:: org.caosdb.server.database.access Access

.. java:import:: org.caosdb.server.database.backend.implementation MySQL.ConnectionException

.. java:import:: org.caosdb.server.database.backend.implementation MySQL.MySQLHelper

.. java:import:: org.caosdb.server.database.backend.transaction RetrieveFullEntityTransaction

.. java:import:: org.caosdb.server.database.backend.transaction RetrieveSparseEntity

.. java:import:: org.caosdb.server.database.misc DBHelper

.. java:import:: org.caosdb.server.database.misc TransactionBenchmark

.. java:import:: org.caosdb.server.entity Entity

.. java:import:: org.caosdb.server.entity EntityID

.. java:import:: org.caosdb.server.entity EntityInterface

.. java:import:: org.caosdb.server.entity Message

.. java:import:: org.caosdb.server.entity Message.MessageType

.. java:import:: org.caosdb.server.entity RetrieveEntity

.. java:import:: org.caosdb.server.entity.container TransactionContainer

.. java:import:: org.caosdb.server.entity.xml ToElementable

.. java:import:: org.caosdb.server.permissions EntityACL

.. java:import:: org.caosdb.server.permissions EntityPermission

.. java:import:: org.caosdb.server.query CQLParser.CqContext

.. java:import:: org.caosdb.server.query CQLParsingErrorListener.ParsingError

.. java:import:: org.caosdb.server.transaction EntityTransactionInterface

.. java:import:: org.caosdb.server.transaction Retrieve

.. java:import:: org.caosdb.server.transaction Transaction

.. java:import:: org.caosdb.server.transaction WriteTransaction

.. java:import:: org.jdom2 Element

.. java:import:: org.slf4j Logger

Query.Selection
===============

.. java:package:: org.caosdb.server.query
   :noindex:

.. java:type:: public static class Selection
   :outertype: Query

   Class which represents the selection of (sub)properties.

Fields
------
MAGIC_NON_PROPERTIES
^^^^^^^^^^^^^^^^^^^^

.. java:field:: static final Set<String> MAGIC_NON_PROPERTIES
   :outertype: Query.Selection

   These magic non-properties are those which are in the results of a \ :java:ref:`RetrieveSparseEntity`\  transaction which is why they do not need to be retrieved with a \ :java:ref:`RetrieveEntityProperties`\  transaction.

Constructors
------------
Selection
^^^^^^^^^

.. java:constructor:: public Selection(String selector)
   :outertype: Query.Selection

   No parsing, just sets the selector string.

Methods
-------
getSelector
^^^^^^^^^^^

.. java:method:: public String getSelector()
   :outertype: Query.Selection

getSubselection
^^^^^^^^^^^^^^^

.. java:method:: public Selection getSubselection()
   :outertype: Query.Selection

isId
^^^^

.. java:method:: public boolean isId()
   :outertype: Query.Selection

   Return true iff this selector selects the id of an entity.

isParent
^^^^^^^^

.. java:method:: public boolean isParent()
   :outertype: Query.Selection

   Return true iff this selector selects the parent of an entity. If not, the retrieval in \ :java:ref:`RetrieveFullEntityTransaction`\  might be optimized by not retrieving the parents at all.

isProperty
^^^^^^^^^^

.. java:method:: public boolean isProperty()
   :outertype: Query.Selection

   Return true iff this selector selects anything that is most likely a property. If not, the retrieval in \ :java:ref:`RetrieveFullEntityTransaction`\  might be optimized by not retrieving the properties at all.

setSubSelection
^^^^^^^^^^^^^^^

.. java:method:: public Selection setSubSelection(Selection sub)
   :outertype: Query.Selection

toElement
^^^^^^^^^

.. java:method:: public Element toElement()
   :outertype: Query.Selection

toString
^^^^^^^^

.. java:method:: @Override public String toString()
   :outertype: Query.Selection