edu.berkeley.cs186.database.query

Class QueryOperator

java.lang.Object

edu.berkeley.cs186.database.query.QueryOperator

Direct Known Subclasses:

GroupByOperator, JoinOperator, ProjectOperator, SequentialScanOperator, SelectOperator

public abstract class QueryOperator
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	QueryOperator.OperatorType

Constructor Summary

Constructors

Modifier	Constructor and Description
	QueryOperator(QueryOperator.OperatorType type)
protected	QueryOperator(QueryOperator.OperatorType type, QueryOperator source)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	checkColumnNameEquality(String fromSchema, String specified) Utility method that checks to see if a column is found in a schema using dot notation.
String	checkSchemaForColumn(Schema schema, String columnName) Utility method to determine whether or not a specified column name is valid with a given schema.
protected abstract Schema	computeSchema()
abstract Iterator<Record>	execute()
QueryOperator	getDestination()
Schema	getOutputSchema()
QueryOperator	getSource()
QueryOperator.OperatorType	getType()
boolean	isGroupBy()
boolean	isIndexScan()
boolean	isJoin()
boolean	isSelect()
boolean	isSequentialScan()
boolean	isWhere()
void	setDestination(QueryOperator destination)
protected void	setOutputSchema(Schema schema)
void	setSource(QueryOperator source)

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryOperator

public QueryOperator(QueryOperator.OperatorType type)

QueryOperator

protected QueryOperator(QueryOperator.OperatorType type,
             QueryOperator source)
                 throws QueryPlanException

Throws:

QueryPlanException

Method Detail

getType

public QueryOperator.OperatorType getType()

isJoin

public boolean isJoin()

isWhere

public boolean isWhere()

isSelect

public boolean isSelect()

isGroupBy

public boolean isGroupBy()

isSequentialScan

public boolean isSequentialScan()

isIndexScan

public boolean isIndexScan()

getSource

public QueryOperator getSource()
                        throws QueryPlanException

Throws:

QueryPlanException

getDestination

public QueryOperator getDestination()
                             throws QueryPlanException

Throws:

QueryPlanException

setSource

public void setSource(QueryOperator source)
               throws QueryPlanException

Throws:

QueryPlanException

setDestination

public void setDestination(QueryOperator destination)
                    throws QueryPlanException

Throws:

QueryPlanException

getOutputSchema

public Schema getOutputSchema()

setOutputSchema

protected void setOutputSchema(Schema schema)

computeSchema

protected abstract Schema computeSchema()
                                 throws QueryPlanException

Throws:

QueryPlanException

execute

public abstract Iterator<Record> execute()
                                  throws QueryPlanException,
                                         DatabaseException

Throws:

QueryPlanException

DatabaseException

checkColumnNameEquality

public boolean checkColumnNameEquality(String fromSchema,
                              String specified)

Utility method that checks to see if a column is found in a schema using dot notation.

Parameters:

fromSchema - the schema to search in

specified - the column name to search for

Returns:

checkSchemaForColumn

public String checkSchemaForColumn(Schema schema,
                          String columnName)
                            throws QueryPlanException

Utility method to determine whether or not a specified column name is valid with a given schema.

Parameters:

schema -

columnName -

Returns:

Throws:

QueryPlanException