org.vanilladb.core.query.parse

Class QueryData

java.lang.Object

org.vanilladb.core.query.parse.QueryData

public class QueryData
extends Object

Data for the SQL select and explain statements.

Constructor Summary

Constructors

Constructor and Description
QueryData(boolean isExplain, Set<String> projFields, Set<String> tables, Predicate pred, Set<String> groupFields, Set<AggregationFn> aggFn, List<String> sortFields, List<Integer> sortDirs) Saves the information of a SQL query.

Method Summary

Modifier and Type	Method and Description
Set<AggregationFn>	aggregationFn() Returns the aggregation functions mentioned in the clause.
Set<String>	groupFields() Returns the field names mentioned in the group by clause.
boolean	isExplain() Returns true if the query is an explain statement.
Predicate	pred() Returns the predicate that describes which records should be in the output table.
Set<String>	projectFields() Returns the fields mentioned in the select clause.
List<Integer>	sortDirections() Returns a list of sort directions to the sorting fields.
List<String>	sortFields() Returns the fields used to sort the query result.
Set<String>	tables() Returns the tables mentioned in the from clause.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryData

public QueryData(boolean isExplain,
                 Set<String> projFields,
                 Set<String> tables,
                 Predicate pred,
                 Set<String> groupFields,
                 Set<AggregationFn> aggFn,
                 List<String> sortFields,
                 List<Integer> sortDirs)

Saves the information of a SQL query.

Parameters:

isExplain - if the query is an explain statement

projFields - a collection of field names

tables - a collection of table names

pred - the query predicate

groupFields - a collection of grouping field names

aggFn - a collection of aggregation functions

sortFields - a list of field names for sorting

sortDirs - a list of sort directions

Method Detail

projectFields

public Set<String> projectFields()

Returns the fields mentioned in the select clause.

Returns:

a collection of field names

tables

public Set<String> tables()

Returns the tables mentioned in the from clause.

Returns:

a collection of table names

pred

public Predicate pred()

Returns the predicate that describes which records should be in the output table.

Returns:

the query predicate

sortFields

public List<String> sortFields()

Returns the fields used to sort the query result.

Returns:

a list of field names for sorting

sortDirections

public List<Integer> sortDirections()

Returns a list of sort directions to the sorting fields. The values of sort directions are defined in RecordComparator.

Returns:

a list of sort directions

groupFields

public Set<String> groupFields()

Returns the field names mentioned in the group by clause.

Returns:

a collection of grouping field names

aggregationFn

public Set<AggregationFn> aggregationFn()

Returns the aggregation functions mentioned in the clause.

Returns:

a collection of aggregation functions

isExplain

public boolean isExplain()

Returns true if the query is an explain statement.

Returns:

true if the query is an explain statement

toString

public String toString()

Overrides:

toString in class Object