Class Vosi11TapMetaReader

java.lang.Object
uk.ac.starlink.vo.Vosi11TapMetaReader
All Implemented Interfaces:
TapMetaReader
public class Vosi11TapMetaReader extends Object implements TapMetaReader
TapMetaReader that works with the VOSI-1.1 scalable /tables endpoint. It should work correctly with VOSI 1.1 services and also with VOSI 1.0 services and services (like, at time of writing, TAPVizieR) that declare themselves as VOSI 1.0 but refuse to emit table details for the full tables list.

Services may return tables without column and foreign key metadata (table elements have no column children). If such a table is retrieved, the detailed metadata may be obtained from a child URL /tables/(table-name). The service may accept a detail parameter for the /tables URL, with possible values min or max (that is /tables?detail=min or /tables?detail=max) to give it a non-binding hint about whether detail is returned in child tables.

Since:
16 Feb 2016
Author:
Mark Taylor

  • Constructor Details

    • Vosi11TapMetaReader

      public Vosi11TapMetaReader(URL tablesetUrl, MetaNameFixer fixer, uk.ac.starlink.util.ContentCoding coding, Vosi11TapMetaReader.DetailMode detailMode)
      Constructor.
      Parameters:
      tablesetUrl - URL of VOSI1.1-like TAP tableset service
      fixer - object that fixes up syntactically incorrect table/column names; if null no fixing is done; has no effect for compliant VODataService documents
      coding - configures HTTP content-coding
      detailMode - detail mode

  • Method Details

    • getMeans

      public String getMeans()
      Description copied from interface: TapMetaReader
      Returns a textual indication of the method or protocol this reader uses to acquire TAP metadata.
      Specified by:
      getMeans in interface TapMetaReader
      Returns:
      short description of metadata acquisition method

    • getSource

      public String getSource()
      Description copied from interface: TapMetaReader
      Returns a textual indication of where the metadata is coming from, typically a URL.
      Specified by:
      getSource in interface TapMetaReader
      Returns:
      address of metadata

    • readSchemas

      public SchemaMeta[] readSchemas() throws IOException
      Description copied from interface: TapMetaReader
      Acquires metadata about schemas in a TAP service.

      May be slow.

      Specified by:
      readSchemas in interface TapMetaReader
      Returns:
      schema metadata array
      Throws:
      IOException

    • readTables

      public TableMeta[] readTables(SchemaMeta schema)
      Description copied from interface: TapMetaReader
      Acquires metadata about tables in a given schema from a TAP service.

      May be slow. May throw UnsupportedOperationException if not needed.

      Specified by:
      readTables in interface TapMetaReader
      Parameters:
      schema - schema containing tables; not altered by call
      Returns:
      table metadata array
      Throws:
      UnsupportedOperationException - always

    • readColumns

      public ColumnMeta[] readColumns(TableMeta table) throws IOException
      Description copied from interface: TapMetaReader
      Acquires metadata about columns in a given table from a TAP service.

      May be slow. May throw UnsupportedOperationException if not needed.

      Specified by:
      readColumns in interface TapMetaReader
      Parameters:
      table - table containing columns; not altered by call
      Returns:
      column metadata array
      Throws:
      IOException

    • readForeignKeys

      public ForeignMeta[] readForeignKeys(TableMeta table) throws IOException
      Description copied from interface: TapMetaReader
      Acquires metadata about foreign keys in a given table from a TAP service.

      May be slow. May throw UnsupportedOperationException if not needed.

      Specified by:
      readForeignKeys in interface TapMetaReader
      Parameters:
      table - table containing columns; not altered by call
      Returns:
      foreign key metadata array
      Throws:
      IOException

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