com.metamatrix.query.sql.lang
Class SetQuery

java.lang.Object
  com.metamatrix.query.sql.lang.Command
      com.metamatrix.query.sql.lang.QueryCommand
          com.metamatrix.query.sql.lang.SetQuery

All Implemented Interfaces:

LanguageObject, java.io.Serializable, java.lang.Cloneable

public class SetQuery
extends QueryCommand

This object acts as a Set operator on multiple Queries - UNION, INTERSECT, and EXCEPT can be implemented with this Class

See Also:

Serialized Form

Nested Class Summary

static class

SetQuery.Operation

Field Summary

Fields inherited from class com.metamatrix.query.sql.lang.Command

tempGroupIDs, TYPE_BATCHED_UPDATE, TYPE_CREATE, TYPE_DELETE, TYPE_DROP, TYPE_DYNAMIC, TYPE_INSERT, TYPE_QUERY, TYPE_SQL, TYPE_STORED_PROCEDURE, TYPE_UNKNOWN, TYPE_UPDATE, TYPE_UPDATE_PROCEDURE, TYPE_XQUERY

Constructor Summary

SetQuery(SetQuery.Operation operation)
Construct query with operation type

SetQuery(SetQuery.Operation operation, boolean all, QueryCommand leftQuery, QueryCommand rightQuery)

Method Summary

void	acceptVisitor(LanguageVisitor visitor) Method for accepting a visitor.
boolean	areResultsCachable() Whether the results are cachable.
java.lang.Object	clone() Deep clone this object to produce a new identical query.
boolean	equals(java.lang.Object obj) Compare two queries for equality.
QueryCommand	getLeftQuery()
SetQuery.Operation	getOperation() Get operation for this set
Query	getProjectedQuery()
java.util.List	getProjectedSymbols() Get the ordered list of all elements returned by this query.
java.util.List<java.lang.Class<?>>	getProjectedTypes()
java.util.List<QueryCommand>	getQueryCommands()
QueryCommand	getRightQuery()
int	getType() Return type of command.
static java.util.List	getTypedProjectedSymbols(java.util.List acutal, java.util.List projectedTypes)
int	hashCode() Get hashcode for query.
boolean	isAll()
void	setAll(boolean all)
void	setLeftQuery(QueryCommand leftQuery)
void	setOperation(SetQuery.Operation operation) Set type of operation
void	setProjectedTypes(java.util.List<java.lang.Class<?>> projectedTypes)
void	setRightQuery(QueryCommand rightQuery)
int	updatingModelCount(QueryMetadataInterface metadata) Return the number of updates on physical sources by this command.

Methods inherited from class com.metamatrix.query.sql.lang.QueryCommand

getLimit, getOrderBy, setLimit, setOrderBy

Methods inherited from class com.metamatrix.query.sql.lang.Command

addExternalGroupsToContext, addExternalGroupToContext, copyMetadataState, getAllExternalGroups, getExternalGroupContexts, getOption, getSubCommands, getSubCommandsUpdatingModelCount, getSubCommandsUpdatingModelCount, getTemporaryMetadata, getUpdateCommandSymbol, getUpdatesCommandSymbol, getVariableValues, getVirtualGroup, isResolved, printCommandTree, printCommandTree, pushNewResolvingContext, setExternalGroupContexts, setIsResolved, setOption, setTemporaryMetadata, setVariableValues, setVirtualGroup, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SetQuery

public SetQuery(SetQuery.Operation operation)

Construct query with operation type

Parameters:

operation - Operation as specified like SetQuery.Operation.UNION

SetQuery

public SetQuery(SetQuery.Operation operation,
                boolean all,
                QueryCommand leftQuery,
                QueryCommand rightQuery)

Method Detail

getProjectedQuery

public Query getProjectedQuery()

Specified by:

getProjectedQuery in class QueryCommand

getType

public int getType()

Return type of command.

Specified by:

getType in class Command

Returns:

TYPE_QUERY

setOperation

public void setOperation(SetQuery.Operation operation)

Set type of operation

Parameters:

operation - Operation constant as defined in this class

getOperation

public SetQuery.Operation getOperation()

Get operation for this set

Returns:

Operation as defined in this class

acceptVisitor

public void acceptVisitor(LanguageVisitor visitor)

Description copied from interface: LanguageObject

Method for accepting a visitor. It is the responsibility of the language object to call back on the visitor.

Parameters:

visitor - Visitor being used

getProjectedSymbols

public java.util.List getProjectedSymbols()

Get the ordered list of all elements returned by this query. These elements may be ElementSymbols or ExpressionSymbols but in all cases each represents a single column.

Specified by:

getProjectedSymbols in class Command

Returns:

Ordered list of SingleElementSymbol

getTypedProjectedSymbols

public static java.util.List getTypedProjectedSymbols(java.util.List acutal,
                                                      java.util.List projectedTypes)

clone

public java.lang.Object clone()

Deep clone this object to produce a new identical query.

Specified by:

clone in interface LanguageObject

Specified by:

clone in class Command

Returns:

Deep clone

equals

public boolean equals(java.lang.Object obj)

Compare two queries for equality.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Other object

Returns:

True if equal

hashCode

public int hashCode()

Get hashcode for query. WARNING: This hash code relies on the hash codes of the Select and Criteria clauses. If the query changes, it's hash code will change and it can be lost from collections. Hash code is only valid after query has been completely constructed.

Overrides:

hashCode in class java.lang.Object

Returns:

Hash code

areResultsCachable

public boolean areResultsCachable()

Description copied from class: Command

Whether the results are cachable.

Specified by:

areResultsCachable in class Command

Returns:

True if the results are cachable; false otherwise.

See Also:

Command.areResultsCachable()

updatingModelCount

public int updatingModelCount(QueryMetadataInterface metadata)
                       throws MetaMatrixComponentException

Description copied from class: Command

Return the number of updates on physical sources by this command.

Specified by:

updatingModelCount in class Command

Parameters:

metadata - QueryMetadataInterface

Returns:

The number of updates on physical sources by this command.

Throws:

MetaMatrixComponentException

getQueryCommands

public java.util.List<QueryCommand> getQueryCommands()

Returns:

the left and right queries as a list. This list cannot be modified.

setProjectedTypes

public void setProjectedTypes(java.util.List<java.lang.Class<?>> projectedTypes)

Parameters:

projectedSymbols - The projectedSymbols to set.

getProjectedTypes

public java.util.List<java.lang.Class<?>> getProjectedTypes()

Returns:

Returns the projectedTypes.

isAll

public boolean isAll()

setAll

public void setAll(boolean all)

getLeftQuery

public QueryCommand getLeftQuery()

setLeftQuery

public void setLeftQuery(QueryCommand leftQuery)

getRightQuery

public QueryCommand getRightQuery()

setRightQuery

public void setRightQuery(QueryCommand rightQuery)