TapServiceFinder (Starjava VO API)

All Known Implementing Classes:

AuxServiceFinder, GlotsServiceFinder
```
public interface TapServiceFinder
```
Defines an object that can make global queries (from the registry or some registry-like entity) about all TAP services and tables satisfying certain constraints.
This interface defines a couple of methods that implementations must implement, and a number of interfaces defining parameter and return types used by those methods.

Since:

30 Jun 2015

Author:

Mark Taylor

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static interface`	`TapServiceFinder.Constraint`	Describes constraints on tables to be found by a certain query.
`static interface`	`TapServiceFinder.Service`	Basic metadata describing a TAP service.
`static interface`	`TapServiceFinder.Table`	Basic metadata describing a table provided by a TAP service.
`static class`	`TapServiceFinder.Target`	Enumerates those metadata items against which search terms can be matched.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`TapServiceFinder.Service[]`	`readAllServices()`	Reads basic metadata about all known TAP services.
`TapServiceFinder.Table[]`	`readSelectedTables(TapServiceFinder.Constraint constraint)`	Locates a list of tables from a global list of all known tables served by all known TAP services that satisfy a given constraint.

- Method Detail
  - readAllServices
```
TapServiceFinder.Service[] readAllServices()
                                    throws java.io.IOException
```
    Reads basic metadata about all known TAP services. May be slow.
    
    Returns:
    
    list of TAP services
    
    Throws:
    
    java.io.IOException
  - readSelectedTables
```
TapServiceFinder.Table[] readSelectedTables(TapServiceFinder.Constraint constraint)
                                     throws java.io.IOException
```
    Locates a list of tables from a global list of all known tables served by all known TAP services that satisfy a given constraint.
    
    Parameters:
    
    constraint - object indicating the tables of interest
    
    Returns:
    
    list of tables matching constraint
    
    Throws:
    
    java.io.IOException