org.jboss.dna.graph.query.process
Class QueryResults

java.lang.Object
  org.jboss.dna.graph.query.process.QueryResults

All Implemented Interfaces:

Serializable, QueryResults

@Immutable
public class QueryResults
extends Object
implements QueryResults

The resulting output of a query.

See Also:

Serialized Form

Nested Class Summary

class

QueryResults.TupleCursor An interface used to walk through the results.

Nested classes/interfaces inherited from interface org.jboss.dna.graph.query.QueryResults

QueryResults.Columns, QueryResults.Cursor, QueryResults.Statistics

Field Summary

Fields inherited from interface org.jboss.dna.graph.query.QueryResults

FORMATTER

Constructor Summary

QueryResults(QueryResults.Columns columns, QueryResults.Statistics statistics)
Create an empty QueryResults object for the supplied context, command, and result columns.

QueryResults(QueryResults.Columns columns, QueryResults.Statistics statistics, List<Object[]> tuples)
Create a results object for the supplied context, command, and result columns and with the supplied tuples.

QueryResults(QueryResults.Columns columns, QueryResults.Statistics statistics, List<Object[]> tuples, Problems problems, String plan)
Create a results object for the supplied context, command, and result columns and with the supplied tuples.

QueryResults(QueryResults.Columns columns, QueryResults.Statistics statistics, Problems problems)
Create an empty QueryResults object for the supplied context, command, and result columns.

Method Summary

QueryResults.Columns	getColumns() Get the description of the columns contained in these results.
QueryResults.Cursor	getCursor() Get a cursor that can be used to walk through the results.
String	getPlan() Get a description of the query plan, if requested.
Problems	getProblems() Get the problems encountered during execution.
int	getRowCount() Get the number of rows in the results.
QueryResults.Statistics	getStatistics() Get the statistics that describe the time metrics for this query.
List<Object[]>	getTuples() Get the actual tuples that contain the results.
boolean	hasErrors() Return true if there is at least one error recorded in the problems.
boolean	hasWarnings() Return true if there is at least one warning recorded in the problems.
String	toString()
String	toString(TypeSystem typeSystem, int maxTuples) Get a string representation of this result object, with a maximum number of tuples to include.
void	toString(TypeSystem typeSystem, StringBuilder sb) Get a string representation of this result object.
void	toString(TypeSystem typeSystem, StringBuilder sb, int maxTuples) Get a string representation of this result object, with a maximum number of tuples to include.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QueryResults

public QueryResults(QueryResults.Columns columns,
                    QueryResults.Statistics statistics,
                    List<Object[]> tuples,
                    Problems problems,
                    String plan)

Create a results object for the supplied context, command, and result columns and with the supplied tuples.

Parameters:

columns - the definition of the query result columns

statistics - the statistics for this query; may not be null

tuples - the tuples

problems - the problems; may be null if there are no problems

plan - the text representation of the query plan, if the hints asked for it

QueryResults

public QueryResults(QueryResults.Columns columns,
                    QueryResults.Statistics statistics,
                    List<Object[]> tuples)

Create a results object for the supplied context, command, and result columns and with the supplied tuples.

Parameters:

columns - the definition of the query result columns

statistics - the statistics for this query; may not be null

tuples - the tuples

QueryResults

public QueryResults(QueryResults.Columns columns,
                    QueryResults.Statistics statistics,
                    Problems problems)

Create an empty QueryResults object for the supplied context, command, and result columns.

Parameters:

columns - the definition of the query result columns

statistics - the statistics for this query; may not be null

problems - the problems; may be null if there are no problems

QueryResults

public QueryResults(QueryResults.Columns columns,
                    QueryResults.Statistics statistics)

Create an empty QueryResults object for the supplied context, command, and result columns.

Parameters:

columns - the definition of the query result columns

statistics - the statistics for this query; may not be null

Method Detail

getColumns

public QueryResults.Columns getColumns()

Get the description of the columns contained in these results. These columns can be used to discover the indexes of the corresponding values from the arrays representing the tuples.

Specified by:

getColumns in interface QueryResults

Returns:

the column descriptions; never null

See Also:

QueryResults.getColumns()

getCursor

public QueryResults.Cursor getCursor()

Get a cursor that can be used to walk through the results.

Specified by:

getCursor in interface QueryResults

Returns:

the cursor; never null, though possibly empty (meaning QueryResults.TupleCursor.hasNext() may return true)

getTuples

public List<Object[]> getTuples()

Get the actual tuples that contain the results. Each element in the list represents a tuple, and each tuple corresponds to the column definitions.

Specified by:

getTuples in interface QueryResults

Returns:

the list of tuples; never null but possibly empty

See Also:

QueryResults.getTuples()

getRowCount

public int getRowCount()

Get the number of rows in the results.

Specified by:

getRowCount in interface QueryResults

Returns:

the number of rows; never negative

See Also:

QueryResults.getRowCount()

getPlan

public String getPlan()

Get a description of the query plan, if requested.

Specified by:

getPlan in interface QueryResults

Returns:

the query plan, or null if the plan was not requested

See Also:

QueryResults.getPlan()

getProblems

public Problems getProblems()

Get the problems encountered during execution.

Specified by:

getProblems in interface QueryResults

Returns:

the problems; never null but possibly empty

See Also:

QueryResults.getProblems()

hasErrors

public boolean hasErrors()

Return true if there is at least one error recorded in the problems.

Specified by:

hasErrors in interface QueryResults

Returns:

true if there is one or more errors associated with the query, or false otherwise

See Also:

QueryResults.hasErrors()

hasWarnings

public boolean hasWarnings()

Return true if there is at least one warning recorded in the problems.

Specified by:

hasWarnings in interface QueryResults

Returns:

true if there is one or more warnings associated with the query, or false otherwise

See Also:

QueryResults.hasWarnings()

getStatistics

public QueryResults.Statistics getStatistics()

Get the statistics that describe the time metrics for this query.

Specified by:

getStatistics in interface QueryResults

Returns:

the statistics; never null

See Also:

QueryResults.getStatistics()

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

toString

public String toString(TypeSystem typeSystem,
                       int maxTuples)

Get a string representation of this result object, with a maximum number of tuples to include.

Parameters:

typeSystem - the type system that can be used to convert the values to a string; may be null if Object.toString() should be used

maxTuples - the maximum number of tuples to print, or Integer.MAX_VALUE if all the tuples are to be printed

Returns:

the string representation; never null

toString

public void toString(TypeSystem typeSystem,
                     StringBuilder sb)

Get a string representation of this result object.

Parameters:

typeSystem - the type system that can be used to convert the values to a string; may be null if Object.toString() should be used

sb - the string builder to which the results should be written; may not be null

toString

public void toString(TypeSystem typeSystem,
                     StringBuilder sb,
                     int maxTuples)

Get a string representation of this result object, with a maximum number of tuples to include.

Parameters:

typeSystem - the type system that can be used to convert the values to a string; may be null if Object.toString() should be used

sb - the string builder to which the results should be written; may not be null

maxTuples - the maximum number of tuples to print, or Integer.MAX_VALUE if all the tuples are to be printed