java.lang.Object
- com.yahoo.component.provider.FreezableClass
- - com.yahoo.processing.Request
  - - com.yahoo.search.Query

All Implemented Interfaces:

com.yahoo.component.provider.Freezable, java.lang.Cloneable
```
public class Query
extends com.yahoo.processing.Request
implements java.lang.Cloneable
```
A search query containing all the information required to produce a Result.
The Query contains:
- the selection criterion received in the request - which may be a structured boolean tree of operators, an annotated piece of natural language text received from a user, or a combination of both
- a set of field containing the additional general parameters of a query - number of hits, ranking, presentation etc.
- a Map of properties, which can be of any object type
The properties has three sources
1. They may be set in some Searcher component already executed for this Query - the properties acts as a blackboard for communicating arbitrary objects between Searcher components.
2. Properties set in the search Request received - the properties acts as a way to parametrize Searcher components from the Request.
3. Properties defined in the selected QueryProfile - this provides defaults for the parameters to Searcher components. Note that by using query profile types, the components may define the set of parameters they support.
When looked up, the properties are accessed in the priority order listed above.
The identity of a query is determined by its content.
Author:

Arne Bergene Fossaa, bratseth

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Query.Type
The type of the query

Field Summary

Fields
Modifier and Type	Field	Description
`static com.yahoo.processing.request.CompoundName`	`EXPLAIN_LEVEL`
`static com.yahoo.processing.request.CompoundName`	`GROUPING_SESSION_CACHE`
`static com.yahoo.processing.request.CompoundName`	`HITS`
`static java.util.List<com.yahoo.processing.request.CompoundName>`	`nativeProperties`	Returns an unmodifiable list of all the native properties under a Query
`static com.yahoo.processing.request.CompoundName`	`NO_CACHE`
`static com.yahoo.processing.request.CompoundName`	`OFFSET`
`static com.yahoo.processing.request.CompoundName`	`QUERY_PROFILE`
`static com.yahoo.processing.request.CompoundName`	`SEARCH_CHAIN`
`static com.yahoo.processing.request.CompoundName`	`TIMEOUT`
`static com.yahoo.processing.request.CompoundName`	`TRACE_LEVEL`

Fields inherited from class com.yahoo.processing.Request
CHAIN, JDISC_REQUEST

Constructor Summary

Constructors
Constructor	Description
`Query()`	Constructs an empty (null) query
`Query(com.yahoo.container.jdisc.HttpRequest request)`	Creates a query from a request
`Query(com.yahoo.container.jdisc.HttpRequest request, CompiledQueryProfile queryProfile)`	Creates a query from a request
`Query(com.yahoo.container.jdisc.HttpRequest request, java.util.Map<java.lang.String,java.lang.String> requestMap, CompiledQueryProfile queryProfile)`	Creates a query from a request
`Query(Query query)`
`Query(java.lang.String query)`	Construct a query from a string formatted in the http style, e.g `?query=test&offset=10&hits=13` The query must be uri encoded.
`Query(java.lang.String query, CompiledQueryProfile queryProfile)`	Construct a query from a string formatted in the http style, e.g `?query=test&offset=10&hits=13` The query must be uri encoded.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`static void`	`addNativeQueryProfileTypesTo(QueryProfileTypeRegistry registry)`
`void`	`attachContext(Query query)`	Set the context information for another query to be part of this query's context information.
`Query`	`clone()`	Returns a clone of this query
`static Query`	`createNewQuery(Query query)`	Creates a new query from another query, but with time sensitive fields reset.
`int`	`encode(java.nio.ByteBuffer buffer)`	Encodes this query onto the given buffer
`int`	`encodeAsProperties(java.nio.ByteBuffer buffer, boolean encodeQueryData)`	Encodes properties of this query.
`boolean`	`equals(java.lang.Object other)`	Returns whether the given query is equal to this
`static QueryProfileType`	`getArgumentType()`
`QueryContext`	`getContext(boolean create)`	Returns the context of this query, possibly creating it if missing.
`long`	`getDurationTime()`	Returns the time (in milliseconds) since the query was started/created
`int`	`getExplainLevel()`	Returns the explain level of this query, 0 means no tracing Higher numbers means increasingly more explaining
`boolean`	`getGroupingSessionCache()`	Returns whether this query should use the grouping session cache.
`int`	`getHits()`	Returns the number of hits requested by the submitter of this query.
`com.yahoo.container.jdisc.HttpRequest`	`getHttpRequest()`	Return the HTTP request which caused this query.
`Model`	`getModel()`	Returns the query representation model to be used for this query, never null
`boolean`	`getNoCache()`	Returns whether this query should never be served from a cache.
`int`	`getOffset()`	Returns the offset from the most relevant hits requested by the submitter of this query.
`Presentation`	`getPresentation()`	Returns the presentation to be used for this query, never null
`Ranking`	`getRanking()`	Returns the ranking to be used for this query, never null
`Select`	`getSelect()`	Returns the select to be used for this query, never null
`SessionId`	`getSessionId()`	Returns the session id of this query, or null if none is assigned
`SessionId`	`getSessionId(java.lang.String serverId)`	Returns the session id of this query, and creates and assigns it if not already present
`long`	`getStartTime()`	Returns the time (in milliseconds since epoch) when this query was started
`long`	`getTimeLeft()`	Get the appropriate timeout for the query.
`long`	`getTimeout()`	Returns the number of milliseconds to wait for a response from a search backend before timing it out.
`int`	`getTraceLevel()`	Returns the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
`boolean`	`hasEncodableProperties()`
`int`	`hashCode()`	Returns a hash of this query based on (some of) its content.
`boolean`	`isTraceable(int level)`	Returns the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
`void`	`prepare()`	Prepares this for binary serialization.
`Properties`	`properties()`	Returns the properties of this query.
`void`	`resetTimeout()`	Resets the start time of the query.
`void`	`setExplainLevel(int explainLevel)`	Sets the explain level of this query, 0 means no tracing Higher numbers means increasingly more explaining
`void`	`setGroupingSessionCache(boolean groupingSessionCache)`	Sets whether this query should use the grouping session cache.
`void`	`setHits(int hits)`	Sets the number of hits requested.
`void`	`setNoCache(boolean noCache)`	Sets whether this query should never be server from a cache.
`void`	`setOffset(int offset)`	Set the hit offset.
`void`	`setTimeout(long timeout)`	Sets the number of milliseconds to wait for a response from a search backend before time out.
`void`	`setTimeout(java.lang.String timeoutString)`	Sets timeout from a string which will be parsed as a
`void`	`setTraceLevel(int traceLevel)`	Sets the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
`void`	`setWindow(int offset, int hits)`	Convenience method to set both the offset and the number of hits to return
`java.lang.String`	`toDetailString()`	Returns a string describing this query in more detail
`java.lang.String`	`toString()`	Returns a string describing this query
`void`	`trace(boolean includeQuery, int traceLevel, java.lang.Object... messages)`	Adds a trace message to this query if the trace level of the query is sufficiently high.
`void`	`trace(java.lang.Object message, int traceLevel)`
`void`	`trace(java.lang.String message, boolean includeQuery, int traceLevel)`	Adds a trace message to this query if the trace level of the query is sufficiently high.
`void`	`trace(java.lang.String message, int traceLevel)`	Adds a context message to this query and to the info log, if the context level of the query is sufficiently high.
`java.lang.String`	`validate()`	Validates this query
`java.lang.String`	`yqlRepresentation()`	Serialize this query as YQL+.
`java.lang.String`	`yqlRepresentation(boolean includeHitsAndOffset)`	Serialize this query as YQL+.
`java.lang.String`	`yqlRepresentation(com.yahoo.collections.Tuple2<java.lang.String,com.yahoo.component.Version> segmenterVersion, boolean includeHitsAndOffset)`	Deprecated. remove the ignored segmenterVersion argument from invocations

Methods inherited from class com.yahoo.processing.Request
errors

Methods inherited from class com.yahoo.component.provider.FreezableClass
ensureNotFrozen, freeze, isFrozen

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - OFFSET
```
public static final com.yahoo.processing.request.CompoundName OFFSET
```
  - HITS
```
public static final com.yahoo.processing.request.CompoundName HITS
```
  - QUERY_PROFILE
```
public static final com.yahoo.processing.request.CompoundName QUERY_PROFILE
```
  - SEARCH_CHAIN
```
public static final com.yahoo.processing.request.CompoundName SEARCH_CHAIN
```
  - TRACE_LEVEL
```
public static final com.yahoo.processing.request.CompoundName TRACE_LEVEL
```
  - EXPLAIN_LEVEL
```
public static final com.yahoo.processing.request.CompoundName EXPLAIN_LEVEL
```
  - NO_CACHE
```
public static final com.yahoo.processing.request.CompoundName NO_CACHE
```
  - GROUPING_SESSION_CACHE
```
public static final com.yahoo.processing.request.CompoundName GROUPING_SESSION_CACHE
```
  - TIMEOUT
```
public static final com.yahoo.processing.request.CompoundName TIMEOUT
```
  - nativeProperties
```
public static final java.util.List<com.yahoo.processing.request.CompoundName> nativeProperties
```
    Returns an unmodifiable list of all the native properties under a Query
- Constructor Detail
  - Query
```
public Query()
```
    Constructs an empty (null) query
  - Query
```
public Query(java.lang.String query)
```
    Construct a query from a string formatted in the http style, e.g ?query=test&offset=10&hits=13 The query must be uri encoded.
  - Query
```
public Query(com.yahoo.container.jdisc.HttpRequest request)
```
    Creates a query from a request
    
    Parameters:
    
    request - the HTTP request from which this is created
  - Query
```
public Query(java.lang.String query,
             CompiledQueryProfile queryProfile)
```
    Construct a query from a string formatted in the http style, e.g ?query=test&offset=10&hits=13 The query must be uri encoded.
  - Query
```
public Query(com.yahoo.container.jdisc.HttpRequest request,
             CompiledQueryProfile queryProfile)
```
    Creates a query from a request
    
    Parameters:
    
    request - the HTTP request from which this is created
    
    queryProfile - the query profile to use for this query, or null if none
  - Query
```
public Query(com.yahoo.container.jdisc.HttpRequest request,
             java.util.Map<java.lang.String,java.lang.String> requestMap,
             CompiledQueryProfile queryProfile)
```
    Creates a query from a request
    
    Parameters:
    
    request - the HTTP request from which this is created
    
    requestMap - the property map of the query
    
    queryProfile - the query profile to use for this query, or null if none
  - Query
```
public Query(Query query)
```
- Method Detail
  - getArgumentType
```
public static QueryProfileType getArgumentType()
```
  - addNativeQueryProfileTypesTo
```
public static void addNativeQueryProfileTypesTo(QueryProfileTypeRegistry registry)
```
  - createNewQuery
```
public static Query createNewQuery(Query query)
```
    Creates a new query from another query, but with time sensitive fields reset.
  - properties
```
public Properties properties()
```
    Returns the properties of this query. The properties are modifiable
    
    Overrides:
    
    properties in class com.yahoo.processing.Request
  - validate
```
public java.lang.String validate()
```
    Validates this query
    
    Returns:
    
    the reason if it is invalid, null if it is valid
  - getStartTime
```
public long getStartTime()
```
    Returns the time (in milliseconds since epoch) when this query was started
  - getDurationTime
```
public long getDurationTime()
```
    Returns the time (in milliseconds) since the query was started/created
  - getTimeLeft
```
public long getTimeLeft()
```
    Get the appropriate timeout for the query.
    
    Returns:
    
    timeout in milliseconds
  - getTimeout
```
public long getTimeout()
```
    Returns the number of milliseconds to wait for a response from a search backend before timing it out. Default is 500.
    Note: If Ranking.RANKFEATURES is turned on, this is hardcoded to 6 minutes.
    
    Returns:
    
    timeout in milliseconds.
  - setTimeout
```
public void setTimeout(long timeout)
```
    Sets the number of milliseconds to wait for a response from a search backend before time out. Default is 500 ms.
  - setTimeout
```
public void setTimeout(java.lang.String timeoutString)
```
    Sets timeout from a string which will be parsed as a
  - resetTimeout
```
public void resetTimeout()
```
    Resets the start time of the query. This will ensure that the query will run for the same amount of time as a newly created query.
  - setTraceLevel
```
public void setTraceLevel(int traceLevel)
```
    Sets the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
  - setExplainLevel
```
public void setExplainLevel(int explainLevel)
```
    Sets the explain level of this query, 0 means no tracing Higher numbers means increasingly more explaining
  - getTraceLevel
```
public int getTraceLevel()
```
    Returns the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
  - getExplainLevel
```
public int getExplainLevel()
```
    Returns the explain level of this query, 0 means no tracing Higher numbers means increasingly more explaining
  - isTraceable
```
public final boolean isTraceable(int level)
```
    Returns the context level of this query, 0 means no tracing Higher numbers means increasingly more tracing
  - getNoCache
```
public boolean getNoCache()
```
    Returns whether this query should never be served from a cache. Default is false
  - setNoCache
```
public void setNoCache(boolean noCache)
```
    Sets whether this query should never be server from a cache. Default is false
  - getGroupingSessionCache
```
public boolean getGroupingSessionCache()
```
    Returns whether this query should use the grouping session cache. Default is false
  - setGroupingSessionCache
```
public void setGroupingSessionCache(boolean groupingSessionCache)
```
    Sets whether this query should use the grouping session cache. Default is false
  - getOffset
```
public int getOffset()
```
    Returns the offset from the most relevant hits requested by the submitter of this query. Default is 0 - to return the most relevant hits
  - getHits
```
public int getHits()
```
    Returns the number of hits requested by the submitter of this query. The default is 10.
  - setHits
```
public void setHits(int hits)
```
    Sets the number of hits requested. If hits is less than 0, an IllegalArgumentException is thrown. Default number of hits is 10.
  - setOffset
```
public void setOffset(int offset)
```
    Set the hit offset. Can not be less than 0. Default is 0.
  - setWindow
```
public void setWindow(int offset,
                      int hits)
```
    Convenience method to set both the offset and the number of hits to return
  - toString
```
public java.lang.String toString()
```
    Returns a string describing this query
    
    Overrides:
    
    toString in class java.lang.Object
  - toDetailString
```
public java.lang.String toDetailString()
```
    Returns a string describing this query in more detail
  - encode
```
public int encode(java.nio.ByteBuffer buffer)
```
    Encodes this query onto the given buffer
    
    Parameters:
    
    buffer - The buffer to encode the query to
    
    Returns:
    
    the number of encoded items
  - trace
```
public void trace(java.lang.String message,
                  int traceLevel)
```
    Adds a context message to this query and to the info log, if the context level of the query is sufficiently high. The context information will be carried over to the result at creation. The message parameter will be included with XML escaping.
    
    Parameters:
    
    message - the message to add
    
    traceLevel - the context level of the message, this method will do nothing if the traceLevel of the query is lower than this value
  - trace
```
public void trace(java.lang.Object message,
                  int traceLevel)
```
  - trace
```
public void trace(java.lang.String message,
                  boolean includeQuery,
                  int traceLevel)
```
    Adds a trace message to this query if the trace level of the query is sufficiently high.
    
    Parameters:
    
    message - the message to add
    
    includeQuery - true to append the query root stringValue at the end of the message
    
    traceLevel - the context level of the message, this method will do nothing if the traceLevel of the query is lower than this value
  - trace
```
public void trace(boolean includeQuery,
                  int traceLevel,
                  java.lang.Object... messages)
```
    Adds a trace message to this query if the trace level of the query is sufficiently high.
    
    Parameters:
    
    includeQuery - true to append the query root stringValue at the end of the message
    
    traceLevel - the context level of the message, this method will do nothing if the traceLevel of the query is lower than this value
    
    messages - the messages whose toStrings will be concatenated into the trace message. Concatenation will only happen if the trace level is sufficiently high.
  - attachContext
```
public void attachContext(Query query)
                   throws java.lang.IllegalStateException
```
    Set the context information for another query to be part of this query's context information. This is to be used if creating fresh query objects as part of a plug-in's execution. The query should be attached before it is used, in case an exception causes premature termination. This is enforced by an IllegalStateException. In other words, intended use is create the new query, and attach the context to the invoking query as soon as the new query is properly initialized.
    This method will always set the argument query's context level to the context level of this query.
    
    Parameters:
    
    query - The query which should be traced as a part of this query.
    
    Throws:
    
    java.lang.IllegalStateException - If the query given as argument already has context information.
  - yqlRepresentation
```
public java.lang.String yqlRepresentation()
```
    Serialize this query as YQL+. This method will never throw exceptions, but instead return a human readable error message if a problem occurred while serializing the query. Hits and offset information will be included if different from default, while linguistics metadata are not added.
    
    Returns:
    
    a valid YQL+ query string or a human readable error message
    
    See Also:
    
    yqlRepresentation(boolean)
  - yqlRepresentation
```
@Deprecated
public java.lang.String yqlRepresentation(com.yahoo.collections.Tuple2<java.lang.String,com.yahoo.component.Version> segmenterVersion,
                                          boolean includeHitsAndOffset)
```
    Deprecated.
    remove the ignored segmenterVersion argument from invocations
  - yqlRepresentation
```
public java.lang.String yqlRepresentation(boolean includeHitsAndOffset)
```
    Serialize this query as YQL+. This will create a string representation which should always be legal YQL+. If a problem occurs, a RuntimeException is thrown.
    
    Parameters:
    
    includeHitsAndOffset - whether to include hits and offset parameters converted to a offset/limit slice
    
    Returns:
    
    a valid YQL+ query string
    
    Throws:
    
    java.lang.RuntimeException - if there is a problem serializing the query tree
  - getContext
```
public QueryContext getContext(boolean create)
```
    Returns the context of this query, possibly creating it if missing. Returns the context, or null
  - hashCode
```
public int hashCode()
```
    Returns a hash of this query based on (some of) its content.
    
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object other)
```
    Returns whether the given query is equal to this
    
    Overrides:
    
    equals in class java.lang.Object
  - clone
```
public Query clone()
```
    Returns a clone of this query
    
    Overrides:
    
    clone in class com.yahoo.processing.Request
  - getPresentation
```
public Presentation getPresentation()
```
    Returns the presentation to be used for this query, never null
  - getSelect
```
public Select getSelect()
```
    Returns the select to be used for this query, never null
  - getRanking
```
public Ranking getRanking()
```
    Returns the ranking to be used for this query, never null
  - getModel
```
public Model getModel()
```
    Returns the query representation model to be used for this query, never null
  - getHttpRequest
```
public com.yahoo.container.jdisc.HttpRequest getHttpRequest()
```
    Return the HTTP request which caused this query. This will never be null when running with queries from the network.
  - getSessionId
```
public SessionId getSessionId()
```
    Returns the session id of this query, or null if none is assigned
  - getSessionId
```
public SessionId getSessionId(java.lang.String serverId)
```
    Returns the session id of this query, and creates and assigns it if not already present
  - hasEncodableProperties
```
public boolean hasEncodableProperties()
```
  - encodeAsProperties
```
public int encodeAsProperties(java.nio.ByteBuffer buffer,
                              boolean encodeQueryData)
```
    Encodes properties of this query.
    
    Parameters:
    
    buffer - the buffer to encode to
    
    encodeQueryData - true to encode all properties, false to only include session information, not actual query data
    
    Returns:
    
    the encoded length
  - prepare
```
public void prepare()
```
    Prepares this for binary serialization.
    This must be invoked after all changes have been made to this query before it is passed on to a receiving backend. Calling it is somewhat expensive, so it should only happen once. If a prepared query is cloned, it stays prepared.

Class Query

Nested Class Summary

Field Summary

Fields inherited from class com.yahoo.processing.Request

Constructor Summary

Method Summary

Methods inherited from class com.yahoo.processing.Request

Methods inherited from class com.yahoo.component.provider.FreezableClass

Methods inherited from class java.lang.Object

Field Detail

OFFSET

HITS

QUERY_PROFILE

SEARCH_CHAIN

TRACE_LEVEL

EXPLAIN_LEVEL

NO_CACHE

GROUPING_SESSION_CACHE

TIMEOUT

nativeProperties

Constructor Detail

Query

Query

Query

Query

Query

Query

Query

Method Detail

getArgumentType

addNativeQueryProfileTypesTo

createNewQuery

properties

validate

getStartTime

getDurationTime

getTimeLeft

getTimeout

setTimeout

setTimeout

resetTimeout

setTraceLevel

setExplainLevel

getTraceLevel

getExplainLevel

isTraceable

getNoCache

setNoCache

getGroupingSessionCache

setGroupingSessionCache

getOffset

getHits

setHits

setOffset

setWindow

toString

toDetailString

encode

trace

trace

trace

trace

attachContext

yqlRepresentation

yqlRepresentation

yqlRepresentation

getContext

hashCode

equals

clone

getPresentation

getSelect

getRanking

getModel

getHttpRequest

getSessionId

getSessionId

hasEncodableProperties

encodeAsProperties

prepare