Package org.apache.qpid.server.query.engine.evaluator

Class EvaluationContext

java.lang.Object

org.apache.qpid.server.query.engine.evaluator.EvaluationContext

public class EvaluationContext
extends Object

Holds temporary values needed during query evaluation

Field Summary

Fields

Modifier and Type	Field	Description
static String	BROKER
static String	COMPARATORS
static String	QUERY_AGGREGATED_RESULT
static String	QUERY_ALIASES
static String	QUERY_DATETIME_PATTERN_OVERRIDEN
static String	QUERY_DEPTH
static String	QUERY_ITEMS_FOR_REMOVAL
static String	QUERY_ORDER_ITEMS_FOR_REMOVAL
static String	QUERY_ORDERING
static String	QUERY_SETTINGS
static String	STATISTICS

Constructor Summary

Constructors

Constructor	Description
EvaluationContext()

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	contains(Object key)
boolean	containsAlias(String alias)
<T,R> QueryExpression<T,R>	currentExecution()
<T> T	get(Object key)
<T> T	get(Object key, Class<T> type)
<T,R> Expression<T,R>	getAlias(String alias)
int	getDepth()
void	incrementDepth()
boolean	isBuilding()
boolean	isExecuting()
EvaluationContext	put(Object key, Object value)
<T,R> void	putAlias(String alias, Expression<T,R> expression)
<T> T	remove(String key)
<T,R> Expression<T,R>	removeAlias(String alias)
void	startBuilding()
<T,R> void	startExecution(QueryExpression<T,R> query)

Methods inherited from class java.lang.Object

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

Field Detail

BROKER

public static final String BROKER

See Also:

Constant Field Values

STATISTICS

public static final String STATISTICS

See Also:

Constant Field Values

QUERY_AGGREGATED_RESULT

public static final String QUERY_AGGREGATED_RESULT

See Also:

Constant Field Values

QUERY_ALIASES

public static final String QUERY_ALIASES

See Also:

Constant Field Values

QUERY_DATETIME_PATTERN_OVERRIDEN

public static final String QUERY_DATETIME_PATTERN_OVERRIDEN

See Also:

Constant Field Values

QUERY_DEPTH

public static final String QUERY_DEPTH

See Also:

Constant Field Values

QUERY_ORDERING

public static final String QUERY_ORDERING

See Also:

Constant Field Values

QUERY_ITEMS_FOR_REMOVAL

public static final String QUERY_ITEMS_FOR_REMOVAL

See Also:

Constant Field Values

QUERY_ORDER_ITEMS_FOR_REMOVAL

public static final String QUERY_ORDER_ITEMS_FOR_REMOVAL

See Also:

Constant Field Values

QUERY_SETTINGS

public static final String QUERY_SETTINGS

See Also:

Constant Field Values

COMPARATORS

public static final String COMPARATORS

See Also:

Constant Field Values

Constructor Detail

EvaluationContext

public EvaluationContext()

Method Detail

put

public EvaluationContext put(Object key,
                             Object value)

get

public <T> T get(Object key,
                 Class<T> type)

get

public <T> T get(Object key)

contains

public boolean contains(Object key)

remove

public <T> T remove(String key)

clear

public void clear()

incrementDepth

public void incrementDepth()

getDepth

public int getDepth()

startBuilding

public void startBuilding()

isBuilding

public boolean isBuilding()

isExecuting

public boolean isExecuting()

putAlias

public <T,R> void putAlias(String alias,
                                 Expression<T,R> expression)

containsAlias

public boolean containsAlias(String alias)

removeAlias

public <T,R> Expression<T,R> removeAlias(String alias)

getAlias

public <T,R> Expression<T,R> getAlias(String alias)

startExecution

public <T,R> void startExecution(QueryExpression<T,R> query)

currentExecution

public <T,R> QueryExpression<T,R> currentExecution()