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## com.bbn.openmap.layer.vpf
Class DcwColumnInfo

    java.lang.Object
      com.bbn.openmap.layer.vpf.DcwColumnInfo

public class DcwColumnInfo
extends java.lang.Object

Encapsulate the information about a particular column in a vpf table. This class can read both VPF V1 (MIL-STD-600006, dated 1992) and VPF V2 (MIL-STD-2407, dated 1996, supercedees V1)

Field Summary
`static char` | `VPF_COLUMN_DATE`
`static char` | `VPF_COLUMN_DOUBLE`
`static char` | `VPF_COLUMN_DOUBLE_2COORD`
`static char` | `VPF_COLUMN_DOUBLE_3COORD`
`static char` | `VPF_COLUMN_FLOAT`
`static char` | `VPF_COLUMN_FLOAT_2COORD`
`static char` | `VPF_COLUMN_FLOAT_3COORD`
`static char` | `VPF_COLUMN_FOREIGN_KEY`
`static char` | `VPF_COLUMN_INT`
`static char` | `VPF_COLUMN_INT_OR_SHORT` VPF Column Type Constant for a column that can be either int or short.
`static char` | `VPF_COLUMN_NON_KEY`
`static char` | `VPF_COLUMN_NULL`
`static char` | `VPF_COLUMN_PRIMARY_KEY` VPF Column Key Type Constants
`static char` | `VPF_COLUMN_SHORT`
`static char` | `VPF_COLUMN_TEXT` VPF Column Type Constants
`static char` | `VPF_COLUMN_TEXTL1`
`static char` | `VPF_COLUMN_TEXTL2`
`static char` | `VPF_COLUMN_TEXTL3`
`static char` | `VPF_COLUMN_TRIPLET`

Constructor Summary
`DcwColumnInfo(BinaryFile inputFile)` Construct a DcwColumnInfo from the specified input stream.

Method Summary
`void` | `assertSchema(char type, int length, boolean strictlength)` Claim that the column has a particular schema
`int` | `fieldLength()` the number of bytes a field of this type takes in the input file
`java.lang.String` | `getColumnDescription()` Get the column description
`java.lang.String` | `getColumnName()` get the name of the column
`char` | `getFieldType()` get the VPF datatype of the column
`char` | `getKeyType()` get the VPF key type (one of VPF_COLUMN_PRIMARY_KEY, VPF_COLUMN_FOREIGN_KEY, or VPF_COLUMN_NON_KEY)
`java.lang.String` | `getNarrativeTable()` get the name of the narrative table
`int` | `getNumberOfElements()` get the number of elements
`java.lang.String` | `getThematicIndexName()` get the name of the thematic index
`java.lang.String` | `getValueDescriptionTable()` Get the name of the value description table
`java.lang.String` | `getVDT()` Get the name of the value description table
`boolean` | `isForeignKey()` Return `true` if this column is a foreign key.
`boolean` | `isNonKey()` Return `true` if this column is not a key column.
`boolean` | `isPrimaryKey()` Return `true` if this column is a primary key.
`java.lang.Object` | `parseField(BinaryFile inputFile)` Read an element of the type specified by the column
`java.lang.String` | `toString()` produce a nice printed version of all our contained information

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### VPF_COLUMN_TEXT

    public static final char VPF_COLUMN_TEXT

  VPF Column Type Constants

  See Also:
    Constant Field Values

### VPF_COLUMN_TEXTL1

    public static final char VPF_COLUMN_TEXTL1

See Also:
  Constant Field Values

### VPF_COLUMN_TEXTL2

    public static final char VPF_COLUMN_TEXTL2

See Also:
  Constant Field Values

### VPF_COLUMN_TEXTL3

    public static final char VPF_COLUMN_TEXTL3

See Also:
  Constant Field Values

### VPF_COLUMN_FLOAT

    public static final char VPF_COLUMN_FLOAT

See Also:
  Constant Field Values

### VPF_COLUMN_DOUBLE

    public static final char VPF_COLUMN_DOUBLE

See Also:
  Constant Field Values

### VPF_COLUMN_SHORT

    public static final char VPF_COLUMN_SHORT

See Also:
  Constant Field Values

### VPF_COLUMN_INT

    public static final char VPF_COLUMN_INT

See Also:
  Constant Field Values

### VPF_COLUMN_FLOAT_2COORD

    public static final char VPF_COLUMN_FLOAT_2COORD

See Also:
  Constant Field Values

### VPF_COLUMN_DOUBLE_2COORD

    public static final char VPF_COLUMN_DOUBLE_2COORD

See Also:
  Constant Field Values

### VPF_COLUMN_FLOAT_3COORD

    public static final char VPF_COLUMN_FLOAT_3COORD

See Also:
  Constant Field Values

### VPF_COLUMN_DOUBLE_3COORD

    public static final char VPF_COLUMN_DOUBLE_3COORD

See Also:
  Constant Field Values

### VPF_COLUMN_DATE

    public static final char VPF_COLUMN_DATE

See Also:
  Constant Field Values

### VPF_COLUMN_NULL

    public static final char VPF_COLUMN_NULL

See Also:
  Constant Field Values

### VPF_COLUMN_TRIPLET

    public static final char VPF_COLUMN_TRIPLET

See Also:
  Constant Field Values

### VPF_COLUMN_INT_OR_SHORT

    public static final char VPF_COLUMN_INT_OR_SHORT

  VPF Column Type Constant for a column that can be either int or short. This value will never be read from a VPF file, its a special value that is accepted by lookupSchema

  See Also:
    Constant Field Values

### VPF_COLUMN_PRIMARY_KEY

    public static final char VPF_COLUMN_PRIMARY_KEY

  VPF Column Key Type Constants

  See Also:
    Constant Field Values

### VPF_COLUMN_FOREIGN_KEY

    public static final char VPF_COLUMN_FOREIGN_KEY

See Also:
  Constant Field Values

### VPF_COLUMN_NON_KEY

    public static final char VPF_COLUMN_NON_KEY

See Also:
  Constant Field Values

Constructor Detail

### DcwColumnInfo

    public DcwColumnInfo(BinaryFile inputFile)
                  throws java.io.EOFException,
                         FormatException

  Construct a DcwColumnInfo from the specified input stream.

Parameters:
  `inputFile` - the filestream to construct from
Throws:
  `java.io.EOFException` - when the first character read is a ';', indicating that we've reached the end of the column list; also thrown for an end of file
  `FormatException` - some error was detected while reading the info for the column.

Method Detail

### assertSchema

    public void assertSchema(char type,
                             int length,
                             boolean strictlength)
                      throws FormatException

  Claim that the column has a particular schema

  Parameters:
    `type` - the FieldType (datatype) this column is expected to contain legal values are specified by the VPF standard. the non-standard value 'i' is also accepted (equivalent to 'I' or 'S'), indicating an integral type.
    `length` - the number of elements in this column
    `strictlength` - false means that variable length columns can be fixed length instead
  Throws:
    `FormatException` - the column is not of the particular type/length

### fieldLength

    public int fieldLength()
                    throws FormatException

  the number of bytes a field of this type takes in the input file

  Returns:
    the number of bytes (-1 for a variable-length field)
  Throws:
    `FormatException` - the FieldType of this Column is not a valid VPF fieldtype

### getColumnName

    public java.lang.String getColumnName()

  get the name of the column

  Returns:
    the name of the column

### getFieldType

    public char getFieldType()

  get the VPF datatype of the column

  Returns:
    the VPF datatype

### getNumberOfElements

    public int getNumberOfElements()

  get the number of elements

  Returns:
    the number of elements

### getKeyType

    public char getKeyType()

  get the VPF key type (one of VPF_COLUMN_PRIMARY_KEY, VPF_COLUMN_FOREIGN_KEY, or VPF_COLUMN_NON_KEY)

  Returns:
    the vpf key type

### isPrimaryKey

    public boolean isPrimaryKey()

  Return `true` if this column is a primary key. For any valid column, exactly one of isPrimaryKey, isForeignKey and isNonKey will be `true`.

  Returns:
    true for a primary key, false otherwise.
  See Also:
    `isForeignKey()`, `isNonKey()`

### isForeignKey

    public boolean isForeignKey()

  Return `true` if this column is a foreign key. For any valid column, exactly one of isPrimaryKey, isForeignKey and isNonKey will be `true`.

  Returns:
    true for a foreign key, false otherwise.
  See Also:
    `isPrimaryKey()`, `isNonKey()`

### isNonKey

    public boolean isNonKey()

  Return `true` if this column is not a key column. For any valid column, exactly one of isPrimaryKey, isForeignKey and isNonKey will be `true`.

  Returns:
    false for a primary or foreign key, true otherwise.
  See Also:
    `isForeignKey()`, `isPrimaryKey()`

### getColumnDescription

    public java.lang.String getColumnDescription()

  Get the column description

  Returns:
    the column description (possibly `null`)

### getValueDescriptionTable

    public java.lang.String getValueDescriptionTable()

  Get the name of the value description table

  Returns:
    the name of the value description table (possibly `null`). The same as getVDT()
  See Also:
    `getVDT()`

### getVDT

    public java.lang.String getVDT()

  Get the name of the value description table

  Returns:
    the name of the value description table (possibly `null`). The same as getValueDescriptionTable
  See Also:
    `getValueDescriptionTable()`

### getThematicIndexName

    public java.lang.String getThematicIndexName()

  get the name of the thematic index

  Returns:
    the thematic index name (possibly `null`)

### getNarrativeTable

    public java.lang.String getNarrativeTable()

  get the name of the narrative table

  Returns:
    the name of the narrative table (possibly `null`)

### parseField

    public java.lang.Object parseField(BinaryFile inputFile)
                                throws java.io.EOFException,
                                       FormatException

  Read an element of the type specified by the column

  Returns:
    the value read from the input file
  Throws:
    `java.io.EOFException` - an end-of-file was encountered before reading any of the field
    `FormatException` - some data-consistency check failed while reading the data, or an end-of-file condition popped up in the middle of reading a field (partial read)

### toString

    public java.lang.String toString()

  produce a nice printed version of all our contained information

  Returns:
    a nice little string

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