Class GavoCSVTableParser

java.lang.Object
uk.ac.starlink.topcat.contrib.gavo.GavoCSVTableParser
public class GavoCSVTableParser extends Object
Class for a parser that can parse CSV input streams, such as those produced by GAVO's database query web apps.

We follow and expand on the specification for CSV files as detailed in http://www.edoceo.com/utilis/csv-file-format.php. We expand on this by allowing zero, one or more header lines. If header lines are there, we assume the last one to give the names of the columns. By default we assume 1 header line is available, the actual number may be set in the appropriate parseCSV method.

We do allow for delimiters different from a comma, but we treat their occurence exactly as otherwise the comma would be treated according to the specification.

We do NOT allow for string demarcations different from the double-quote.

A a final touch we allow for "comment" lines starting with a comment string. Lines starting with the comment string (e.g. ";;") will be ignored (but see next paragraph). This is needed in order to be able to successfully parse CSV files as output by CDS/Vizier, or the GAVO "simpledb" web applications.

Addition: we assume that there are comment lines starting with "#COLUMN" which indicate metadata about all the columns. We assume that the first line without "#" symbol contains the column names. All subsequent rows are data.

Author:
Gerard Lemson, Hans-Martin Adorf, Gerard Lemson, Mark Taylor

  • Field Details

    • DEFAULT_DELIMITER

      public static final String DEFAULT_DELIMITER
      The default delimiter between table entries
      See Also:

    • DEFAULT_COMMENT_PREFIX

      public static final String DEFAULT_COMMENT_PREFIX
      The default comment prefix
      See Also:

  • Constructor Details

    • GavoCSVTableParser

      public GavoCSVTableParser(uk.ac.starlink.table.StoragePolicy storage, Component parent)
      Creates a new instance of CSVTableParser

    • GavoCSVTableParser

      public GavoCSVTableParser(uk.ac.starlink.table.StoragePolicy storage, Component parent, String delimiter)
      Creates a new instance of CSVTableParser
      Parameters:
      parent - component controlling this parser (may be null)
      delimiter - the character delimiter ('separator')

  • Method Details

    • getCommentPrefix

      public String getCommentPrefix()
      Getter for property commentPrefix.
      Returns:
      Value of property commentPrefix.

    • setDelimiter

      public void setDelimiter(String delimiter)
      Sets the delimiter to use.
      Parameters:
      delimiter - the delimiter.

    • getDelimiter

      public String getDelimiter()
      Gets the delimiter.
      Returns:
      a String with the delimiter.

    • parseLine

      public List<String> parseLine(String line)
      Return a List of tokens (Strings) from the specified line, delimited by the specified delimiter.
      Parameters:
      line - a String with the line to parse
      Returns:
      a List with the tokens

    • parse

      public uk.ac.starlink.table.StarTable parse(InputStream stream) throws Exception
      Throws:
      Exception

    • classForJDBCType

      public static Class<?> classForJDBCType(int jdbcType)

    • objectForJDBCType

      public static Object objectForJDBCType(int jdbcType, String value)