Package com.querydsl.core

Class EmptyMetadata

java.lang.Object

com.querydsl.core.EmptyMetadata

All Implemented Interfaces:

QueryMetadata, Serializable

public final class EmptyMetadata
extends Object
implements QueryMetadata

EmptyMetadata provides an immutable empty QueryMetadata instance.

Modification methods throw UnsupportedOperationException.

Author:

tiwe

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final QueryMetadata	DEFAULT

Constructor Summary

Constructors

Constructor	Description
EmptyMetadata()

Method Summary

Modifier and Type	Method	Description
void	addFlag(QueryFlag flag)	Add the given query flag
void	addGroupBy(Expression<?> o)	Add the given group by expressions
void	addHaving(Predicate o)	Add the given having expressions
void	addJoin(JoinType joinType, Expression<?> expr)	Add the given query join
void	addJoinCondition(Predicate o)	Add the given join condition to the last given join
void	addJoinFlag(JoinFlag flag)	Add the given join flag to the last given join
void	addOrderBy(OrderSpecifier<?> o)	Add the given order specifiers
void	addWhere(Predicate o)	Add the given where expressions
void	clearOrderBy()	Clear the order expressions
void	clearWhere()	Clear the where expressions
QueryMetadata	clone()	Clone this QueryMetadata instance
Set<QueryFlag>	getFlags()	Get all query flags
List<Expression<?>>	getGroupBy()	Get the group by expressions
Predicate	getHaving()	Get the having expressions
List<JoinExpression>	getJoins()	Get the query joins
QueryModifiers	getModifiers()	Get the QueryModifiers
List<OrderSpecifier<?>>	getOrderBy()	Get the OrderSpecifiers
Map<ParamExpression<?>,Object>	getParams()	Get the parameter bindings
Expression<?>	getProjection()	Get the projection
Predicate	getWhere()	Get the expressions aggregated into a single boolean expression or null, if none where defined
boolean	hasFlag(QueryFlag flag)	Return whether the given query flag is applied
boolean	isDistinct()	Get whether the projection is distinct
boolean	isUnique()	Get whether the projection is unique
void	removeFlag(QueryFlag flag)	Remove the given query flag
void	reset()	Reset the projection
void	setDistinct(boolean distinct)	Set the distinct flag
void	setLimit(Long limit)	Set the maximum number of rows
void	setModifiers(QueryModifiers restriction)	Set the query modifiers limit and offset
void	setOffset(Long offset)	Set the number of skipped rows
<T> void	setParam(ParamExpression<T> param, T value)	Bind the value for the given parameter expression
void	setProjection(Expression<?> o)	Set the projection
void	setUnique(boolean unique)	Set the unique flag
void	setValidate(boolean v)	Set the validate flag

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT

public static final QueryMetadata DEFAULT

Constructor Details

EmptyMetadata

public EmptyMetadata()

Method Details

addGroupBy

public void addGroupBy(Expression<?> o)

Description copied from interface: QueryMetadata

Add the given group by expressions

Specified by:

addGroupBy in interface QueryMetadata

Parameters:

o - group by expressions

addHaving

public void addHaving(Predicate o)

Description copied from interface: QueryMetadata

Add the given having expressions

Specified by:

addHaving in interface QueryMetadata

Parameters:

o - having conditions

addJoin

public void addJoin(JoinType joinType,
 Expression<?> expr)

Description copied from interface: QueryMetadata

Add the given query join

Specified by:

addJoin in interface QueryMetadata

Parameters:

joinType - type of join

expr - join target

addJoinCondition

public void addJoinCondition(Predicate o)

Description copied from interface: QueryMetadata

Add the given join condition to the last given join

Specified by:

addJoinCondition in interface QueryMetadata

Parameters:

o - join condition

addOrderBy

public void addOrderBy(OrderSpecifier<?> o)

Description copied from interface: QueryMetadata

Add the given order specifiers

Specified by:

addOrderBy in interface QueryMetadata

Parameters:

o - order

setProjection

public void setProjection(Expression<?> o)

Description copied from interface: QueryMetadata

Set the projection

Specified by:

setProjection in interface QueryMetadata

Parameters:

o - projection

addWhere

public void addWhere(Predicate o)

Description copied from interface: QueryMetadata

Add the given where expressions

Specified by:

addWhere in interface QueryMetadata

Parameters:

o - where condition

clearOrderBy

public void clearOrderBy()

Description copied from interface: QueryMetadata

Clear the order expressions

Specified by:

clearOrderBy in interface QueryMetadata

clearWhere

public void clearWhere()

Description copied from interface: QueryMetadata

Clear the where expressions

Specified by:

clearWhere in interface QueryMetadata

clone

public QueryMetadata clone()

Description copied from interface: QueryMetadata

Clone this QueryMetadata instance

Specified by:

clone in interface QueryMetadata

Overrides:

clone in class Object

Returns:

new QueryMetadata instance with cloned state

getGroupBy

public List<Expression<?>> getGroupBy()

Description copied from interface: QueryMetadata

Get the group by expressions

Specified by:

getGroupBy in interface QueryMetadata

Returns:

group by

getHaving

public Predicate getHaving()

Description copied from interface: QueryMetadata

Get the having expressions

Specified by:

getHaving in interface QueryMetadata

Returns:

having condition, or null if none set

getJoins

public List<JoinExpression> getJoins()

Description copied from interface: QueryMetadata

Get the query joins

Specified by:

getJoins in interface QueryMetadata

Returns:

joins

getModifiers

public QueryModifiers getModifiers()

Description copied from interface: QueryMetadata

Get the QueryModifiers

Specified by:

getModifiers in interface QueryMetadata

Returns:

modifiers

getOrderBy

public List<OrderSpecifier<?>> getOrderBy()

Description copied from interface: QueryMetadata

Get the OrderSpecifiers

Specified by:

getOrderBy in interface QueryMetadata

Returns:

order by

getProjection

public Expression<?> getProjection()

Description copied from interface: QueryMetadata

Get the projection

Specified by:

getProjection in interface QueryMetadata

Returns:

projection

getParams

public Map<ParamExpression<?>,Object> getParams()

Description copied from interface: QueryMetadata

Get the parameter bindings

Specified by:

getParams in interface QueryMetadata

Returns:

parameter bindings

getWhere

public Predicate getWhere()

Description copied from interface: QueryMetadata

Get the expressions aggregated into a single boolean expression or null, if none where defined

Specified by:

getWhere in interface QueryMetadata

Returns:

where condition or null, if none set

isDistinct

public boolean isDistinct()

Description copied from interface: QueryMetadata

Get whether the projection is distinct

Specified by:

isDistinct in interface QueryMetadata

Returns:

distinct

isUnique

public boolean isUnique()

Description copied from interface: QueryMetadata

Get whether the projection is unique

Specified by:

isUnique in interface QueryMetadata

Returns:

unique

reset

public void reset()

Description copied from interface: QueryMetadata

Reset the projection

Specified by:

reset in interface QueryMetadata

setDistinct

public void setDistinct(boolean distinct)

Description copied from interface: QueryMetadata

Set the distinct flag

Specified by:

setDistinct in interface QueryMetadata

Parameters:

distinct - distinct

setLimit

public void setLimit(Long limit)

Description copied from interface: QueryMetadata

Set the maximum number of rows

Specified by:

setLimit in interface QueryMetadata

Parameters:

limit - limit

setModifiers

public void setModifiers(QueryModifiers restriction)

Description copied from interface: QueryMetadata

Set the query modifiers limit and offset

Specified by:

setModifiers in interface QueryMetadata

Parameters:

restriction - restriction

setOffset

public void setOffset(Long offset)

Description copied from interface: QueryMetadata

Set the number of skipped rows

Specified by:

setOffset in interface QueryMetadata

Parameters:

offset - offset

setUnique

public void setUnique(boolean unique)

Description copied from interface: QueryMetadata

Set the unique flag

Specified by:

setUnique in interface QueryMetadata

Parameters:

unique - unique

setParam

public <T> void setParam(ParamExpression<T> param,
 T value)

Description copied from interface: QueryMetadata

Bind the value for the given parameter expression

Specified by:

setParam in interface QueryMetadata

Type Parameters:

T - binding type

Parameters:

param - parameter

value - binding

addFlag

public void addFlag(QueryFlag flag)

Description copied from interface: QueryMetadata

Add the given query flag

Specified by:

addFlag in interface QueryMetadata

Parameters:

flag - query flag

hasFlag

public boolean hasFlag(QueryFlag flag)

Description copied from interface: QueryMetadata

Return whether the given query flag is applied

Specified by:

hasFlag in interface QueryMetadata

Parameters:

flag - query flag

Returns:

true, if present, false, if not

getFlags

public Set<QueryFlag> getFlags()

Description copied from interface: QueryMetadata

Get all query flags

Specified by:

getFlags in interface QueryMetadata

Returns:

all used query flags

setValidate

public void setValidate(boolean v)

Description copied from interface: QueryMetadata

Set the validate flag

Specified by:

setValidate in interface QueryMetadata

Parameters:

v - validate

addJoinFlag

public void addJoinFlag(JoinFlag flag)

Description copied from interface: QueryMetadata

Add the given join flag to the last given join

Specified by:

addJoinFlag in interface QueryMetadata

Parameters:

flag - join flag

removeFlag

public void removeFlag(QueryFlag flag)

Description copied from interface: QueryMetadata

Remove the given query flag

Specified by:

removeFlag in interface QueryMetadata

Parameters:

flag - query flag