org.nsdl.mptstore.query
Interface QueryResults

All Superinterfaces:

ClosableIterator<java.util.List<Node>>, java.util.Iterator<java.util.List<Node>>

All Known Implementing Classes:

SQLUnionQueryResults

public interface QueryResults
extends ClosableIterator<java.util.List<Node>>

An iterator representing any number of query result rows.

Author:

cwilper@cs.cornell.edu

Method Summary

java.util.List<java.lang.String>	getTargets() Get the column names for these query result rows.
boolean	hasNext() Tell whether there's another row of results.
java.util.List<Node>	next() Get the next row of results.
void	remove() Throws UnsupportedOperationException.

Methods inherited from interface org.nsdl.mptstore.core.ClosableIterator

close

Method Detail

getTargets

java.util.List<java.lang.String> getTargets()

Get the column names for these query result rows.

Returns:

the ordered list of names.

next

java.util.List<Node> next()
                          throws RuntimeQueryException

Get the next row of results.

Specified by:

next in interface java.util.Iterator<java.util.List<Node>>

Returns:

the next row.

Throws:

RuntimeQueryException - if there's an error getting the next row.

hasNext

boolean hasNext()

Tell whether there's another row of results.

Specified by:

hasNext in interface java.util.Iterator<java.util.List<Node>>

Returns:

true if there's another row, false if not.

remove

void remove()
            throws java.lang.UnsupportedOperationException

Throws UnsupportedOperationException. This operation is not supported by QueryResults implementations.

Specified by:

remove in interface java.util.Iterator<java.util.List<Node>>

Throws:

java.lang.UnsupportedOperationException - if this method is called.