Package org.jfree.data.io

Class CSV

  • public class CSV
extends java.lang.Object
    A utility class for reading CategoryDataset data from a CSV file. This initial version is very basic, and won't handle errors in the data file very gracefully.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private char fieldDelimiter
      The field delimiter.
      private char textDelimiter
      The text delimiter.

    • Constructor Summary

      Constructors 
      Constructor Description
      CSV()
      Creates a new CSV reader where the field delimiter is a comma, and the text delimiter is a double-quote.
      CSV​(char fieldDelimiter, char textDelimiter)
      Creates a new reader with the specified field and text delimiters.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private java.util.List extractColumnKeys​(java.lang.String line)
      Extracts the column keys from a string.
      private void extractRowKeyAndData​(java.lang.String line, DefaultCategoryDataset dataset, java.util.List columnKeys)
      Extracts the row key and data for a single line from the input source.
      CategoryDataset readCategoryDataset​(java.io.Reader in)
      Reads a CategoryDataset from a CSV file or input source.
      private java.lang.String removeStringDelimiters​(java.lang.String key)
      Removes the string delimiters from a key (as well as any white space outside the delimiters).

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • fieldDelimiter

        private char fieldDelimiter
        The field delimiter.

      • textDelimiter

        private char textDelimiter
        The text delimiter.

    • Constructor Detail

      • CSV

        public CSV()
        Creates a new CSV reader where the field delimiter is a comma, and the text delimiter is a double-quote.

      • CSV

        public CSV​(char fieldDelimiter,
           char textDelimiter)
        Creates a new reader with the specified field and text delimiters.
        Parameters:
        fieldDelimiter - the field delimiter (usually a comma, semi-colon, colon, tab or space).
        textDelimiter - the text delimiter (usually a single or double quote).

    • Method Detail

      • readCategoryDataset

        public CategoryDataset readCategoryDataset​(java.io.Reader in)
                                    throws java.io.IOException
        Reads a CategoryDataset from a CSV file or input source.
        Parameters:
        in - the input source.
        Returns:
        A category dataset.
        Throws:
        java.io.IOException - if there is an I/O problem.

      • extractColumnKeys

        private java.util.List extractColumnKeys​(java.lang.String line)
        Extracts the column keys from a string.
        Parameters:
        line - a line from the input file.
        Returns:
        A list of column keys.

      • extractRowKeyAndData

        private void extractRowKeyAndData​(java.lang.String line,
                                  DefaultCategoryDataset dataset,
                                  java.util.List columnKeys)
        Extracts the row key and data for a single line from the input source.
        Parameters:
        line - the line from the input source.
        dataset - the dataset to be populated.
        columnKeys - the column keys.

      • removeStringDelimiters

        private java.lang.String removeStringDelimiters​(java.lang.String key)
        Removes the string delimiters from a key (as well as any white space outside the delimiters).
        Parameters:
        key - the key (including delimiters).
        Returns:
        The key without delimiters.