uk.ac.starlink.ttools.cone
Class TapUploadMatcher

java.lang.Object
  uk.ac.starlink.ttools.cone.TapUploadMatcher

All Implemented Interfaces:

UploadMatcher

public class TapUploadMatcher
extends Object
implements UploadMatcher

UploadMatcher implementation for a TAP service.

Note that although the lon/lat coordinates are phrased in the API as RA/Dec, to match the language of the ConeQueryRowSequence interface, in fact any lon/lat coordinate pairs can be used, of course providing that the same coordinates are understood in the (uploaded) query sequence and the remote TAP table.

Since:

4 Oct 2014

Author:

Mark Taylor

Constructor Summary

TapUploadMatcher(uk.ac.starlink.vo.EndpointSet endpointSet, String tableName, String raExpr, String decExpr, String radiusDegExpr, boolean isSync, String[] tapCols, ServiceFindMode serviceMode, Map<String,String> extraParams, uk.ac.starlink.util.ContentCoding coding)
Constructor.

Method Summary

String	getAdql(long maxrec) Returns an ADQL expression to retrieve the raw result table from the TAP service.
ColumnPlan	getColumnPlan(uk.ac.starlink.table.ColumnInfo[] resultCols, uk.ac.starlink.table.ColumnInfo[] uploadCols) Returns an object that understands what columns are where in an output table generated from the raw result produced by this matcher.
static ServiceFindMode[]	getSupportedServiceModes() Returns service modes supported by this class.
boolean	streamRawResult(ConeQueryRowSequence coneSeq, uk.ac.starlink.table.TableSink rawResultSink, RowMapper<?> rowMapper, long maxrec) Scans a sequence of positional queries, uploads it to a remote service, and writes the returned values to a given sink.

Methods inherited from class java.lang.Object

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

Constructor Detail

TapUploadMatcher

public TapUploadMatcher(uk.ac.starlink.vo.EndpointSet endpointSet,
                        String tableName,
                        String raExpr,
                        String decExpr,
                        String radiusDegExpr,
                        boolean isSync,
                        String[] tapCols,
                        ServiceFindMode serviceMode,
                        Map<String,String> extraParams,
                        uk.ac.starlink.util.ContentCoding coding)

Constructor.

Parameters:

endpointSet - TAP service endpoint locations

tableName - name of table in TAP service to match against

raExpr - column name (or ADQL expression) for RA in decimal degrees in TAP table

decExpr - column name (or ADQL expression) for Declination in decimal degrees in TAP table

radiusDegExpr - ADQL expression (maybe constant) for search radius in decimal degrees

isSync - true for synchronous, false for asynchronous

tapCols - column names from the remote table to be included in the output table; if null, all are included

serviceMode - type of match

extraParams - map of additional parameters for TAP query

coding - configures HTTP compression for result

Method Detail

streamRawResult

public boolean streamRawResult(ConeQueryRowSequence coneSeq,
                               uk.ac.starlink.table.TableSink rawResultSink,
                               RowMapper<?> rowMapper,
                               long maxrec)
                        throws IOException

Description copied from interface: UploadMatcher

Scans a sequence of positional queries, uploads it to a remote service, and writes the returned values to a given sink.

Both the read and the write should ideally be streamed (read as uploaded and written as received) so that progress can be logged properly.

The result is written to the given rawResultSink (which will probably be a RowStore). To make sense of the table thus written, it is necessary to use the RowMapper supplied to this method and the ColumnPlan available from this object. The RowMapper associates result rows with queries from the input row sequence, and the ColumnPlan knows where the special and other columns are in the result table.

Specified by:

streamRawResult in interface UploadMatcher

Parameters:

coneSeq - sequence of cone-like positional queries

rawResultSink - destination for result rows obtained from the target matcher service

rowMapper - used to label rows; queries are labelled with the value returned from the getIndex method of coneSeq

maxrec - user-supplied limit on the maximum number of output rows, though the service may truncate the result; if <0, no limit is requested

Returns:

true iff the result was truncated due to overflow

Throws:

IOException

getColumnPlan

public ColumnPlan getColumnPlan(uk.ac.starlink.table.ColumnInfo[] resultCols,
                                uk.ac.starlink.table.ColumnInfo[] uploadCols)

Description copied from interface: UploadMatcher

Returns an object that understands what columns are where in an output table generated from the raw result produced by this matcher.

Specified by:

getColumnPlan in interface UploadMatcher

Parameters:

resultCols - columns in the raw result table written by this object's streamRawResult method

uploadCols - columns from the table that will be joined to the raw result to get the output table

Returns:

column plan

getAdql

public String getAdql(long maxrec)

Returns an ADQL expression to retrieve the raw result table from the TAP service.

Parameters:

maxrec - maximum number of records permitted

Returns:

ADQL text

getSupportedServiceModes

public static ServiceFindMode[] getSupportedServiceModes()

Returns service modes supported by this class. Currently, all are supported apart from ServiceFindMode.BEST_REMOTE. That one is basically impossible to do using ADQL as far as I can tell, since there is in general no way to tell what remote table row a given row of a query result is referring to. You could do it in special cases if the table in question has a primary key.

Returns:

supported find modes