Class RowListStarTable

java.lang.Object
uk.ac.starlink.table.AbstractStarTable
uk.ac.starlink.table.RandomStarTable
uk.ac.starlink.table.RowListStarTable
All Implemented Interfaces:
Closeable, AutoCloseable, StarTable
public class RowListStarTable extends RandomStarTable
Simple modifiable StarTable implementation. It has a fixed number of columns and a variable number of rows; rows can be added, removed and modified.

The current implementation stores the data in a List of Object[] arrays - each list element contains the cells of one row of the table. Thus currently you can't store more than Integer.MAX_VALUE rows.

Some validation is performed when objects are inserted into the table, but it is possible to subvert this - the table itself can't guarantee that its data structures represent a legal table.

Author:
Mark Taylor (Starlink)

  • Constructor Details

    • RowListStarTable

      public RowListStarTable(ColumnInfo[] colInfos)
      Constructs a new RowListStarTable specifying the columns that it will contain.
      Parameters:
      colInfos - array of objects defining the columns of the table

    • RowListStarTable

      public RowListStarTable(StarTable template)
      Constructs a new RowListStarTable with its column and table metadata copied from an existing table. The data of the template is ignored.
      Parameters:
      template - template table supplying column and table metadata

  • Method Details

    • getRowCount

      public long getRowCount()
      Description copied from class: RandomStarTable
      Implementations must supply a non-negative return value.
      Specified by:
      getRowCount in interface StarTable
      Specified by:
      getRowCount in class RandomStarTable
      Returns:
      the number of rows in the table

    • getColumnCount

      public int getColumnCount()
      Description copied from interface: StarTable
      Returns the number of columns in this table.
      Specified by:
      getColumnCount in interface StarTable
      Specified by:
      getColumnCount in class AbstractStarTable
      Returns:
      the number of columns

    • getColumnInfo

      public ColumnInfo getColumnInfo(int icol)
      Description copied from interface: StarTable
      Returns the object describing the data in a given column.
      Specified by:
      getColumnInfo in interface StarTable
      Specified by:
      getColumnInfo in class AbstractStarTable
      Parameters:
      icol - the column for which header information is required
      Returns:
      a ValueInfo object for column icol

    • getCell

      public Object getCell(long lrow, int icol)
      Description copied from class: RandomStarTable
      Implementations of this method must be safe for concurrent calls from multiple threads.
      Specified by:
      getCell in interface StarTable
      Specified by:
      getCell in class RandomStarTable
      Parameters:
      lrow - the index of the cell's row
      icol - the index of the cell's column
      Returns:
      the contents of this cell

    • getRow

      public Object[] getRow(long lrow)
      Description copied from class: AbstractStarTable
      The AbstractStarTable implementation of this method constructs a row by repeated invocation of AbstractStarTable.getCell(long, int).
      Specified by:
      getRow in interface StarTable
      Overrides:
      getRow in class AbstractStarTable
      Parameters:
      lrow - the index of the row to retrieve
      Returns:
      an array of the objects in each cell in row irow

    • setCell

      public void setCell(long lrow, int icol, Object value)
      Sets the value of a given cell in the table. value has to have a class compatible with its column.
      Parameters:
      lrow - row index
      icol - column index
      value - new value for the cell at lrow, icol
      Throws:
      IllegalArgumentException - if value is not compatible with column icol

    • setRow

      public void setRow(long lrow, Object[] values)
      Sets the value of a given row in the table. Overwrites the existing values of the cells in that row. values has to have the same number of elements as there are columns in this table, and its elements have to have classes compatible with the table columns.
      Parameters:
      lrow - row index
      values - new values for the cells in row lrow
      Throws:
      IllegalArgumentException - if values has the wrong number of elements or they are of the wrong class

    • addRow

      public void addRow(Object[] values)
      Adds a new row to the end of the table. values has to have the same number of elements as there are columns in this table, and its elements have to have classes compatible with the table columns.
      Parameters:
      values - values for the cells in the new row
      Throws:
      IllegalArgumentException - if values has the wrong number of elements or they are of the wrong class

    • insertRow

      public void insertRow(long lrow, Object[] values)
      Adds a new row in the middle of the table. Rows after lrow will be shoved down by one. values has to have the same number of elements as there are columns in this table, and its elements have to have classes compatible with the table columns.
      Parameters:
      lrow - row index for the new row
      values - values for the cells in the new row
      Throws:
      IllegalArgumentException - if values has the wrong number of elements or they are of the wrong class

    • removeRow

      public void removeRow(long lrow)
      Removes an existing row from the table. Rows after lrow will be moved up by one.
      Parameters:
      lrow - index of the row to remove

    • clearRows

      public void clearRows()
      Removes all rows from the table.

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