org.apache.lens.server.query.collect

Class DefaultQueryCollection

java.lang.Object

org.apache.lens.server.query.collect.DefaultQueryCollection

All Implemented Interfaces:

ImmutableQueryCollection, MutableQueryCollection, QueryCollection

public class DefaultQueryCollection
extends Object
implements QueryCollection

Implementation which creates multiple in memory views of queries existing in lens system and owns responsibility of keeping all the views consistent with each other. This implementation is not thread-safe.

See Also:

QueryCollection

Constructor Summary

Constructors

Constructor and Description
DefaultQueryCollection()
DefaultQueryCollection(Set<QueryContext> queries)
DefaultQueryCollection(TreeSet<QueryContext> treeSet)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(QueryContext query) add the given query to existing queries
boolean	addAll(Set<QueryContext> queries)
Set<QueryContext>	getQueries()
Set<QueryContext>	getQueries(String user)
int	getQueriesCount()
Integer	getQueryIndex(QueryContext query) Since the collection is a linkedHashSet, the order of queries is always maintained.
boolean	remove(QueryContext query) removes given query from existing queries
boolean	removeAll(Set<QueryContext> queries)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultQueryCollection

public DefaultQueryCollection()

DefaultQueryCollection

public DefaultQueryCollection(@NonNull
                      Set<QueryContext> queries)

DefaultQueryCollection

public DefaultQueryCollection(TreeSet<QueryContext> treeSet)

Method Detail

add

public boolean add(QueryContext query)

Description copied from interface: MutableQueryCollection

add the given query to existing queries

Specified by:

add in interface MutableQueryCollection

Returns:

addAll

public boolean addAll(Set<QueryContext> queries)

Specified by:

addAll in interface MutableQueryCollection

Returns:

remove

public boolean remove(QueryContext query)

Description copied from interface: MutableQueryCollection

removes given query from existing queries

Specified by:

remove in interface MutableQueryCollection

Returns:

removeAll

public boolean removeAll(Set<QueryContext> queries)

Specified by:

removeAll in interface MutableQueryCollection

getQueries

public Set<QueryContext> getQueries()

Specified by:

getQueries in interface ImmutableQueryCollection

Returns:

A new set copied from this collection of queries. Elements in the set are not cloned or copied. Multiple iterations over returned set are guaranteed to be in same order. If there are no queries, then an empty set is returned. null is never returned.

getQueries

public Set<QueryContext> getQueries(String user)

Specified by:

getQueries in interface ImmutableQueryCollection

Parameters:

user - User for whom queries have to be returned.

Returns:

A set of queries submitted by the given user. A new set is created and returned. Elements in the set are not cloned or copied. Multiple iterations over returned set are guaranteed to be in same order. If there are no queries, then an empty set is returned. null is never returned.

getQueriesCount

public int getQueriesCount()

Specified by:

getQueriesCount in interface ImmutableQueryCollection

Returns:

Count of existing queries

getQueryIndex

public Integer getQueryIndex(QueryContext query)

Since the collection is a linkedHashSet, the order of queries is always maintained.

Specified by:

getQueryIndex in interface ImmutableQueryCollection

Parameters:

query -

Returns: