com.sap.conn.jco

## Interface JCoField

- All Known Subinterfaces:
    JCoParameterField, JCoRecordField

      public interface JCoField

  Class to represent a data field in a record (i.e. a parameter list, a table, a structure).

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `BigDecimal` | `getBigDecimal()` Returns the field's value as a `BigDecimal` object.
    `BigInteger` | `getBigInteger()` Returns the field's value as a `BigInteger` object.
    `InputStream` | `getBinaryStream()` Returns the field's value as a stream of uninterpreted bytes in form of a `java.io.InputStream` object.
    `byte` | `getByte()` Returns the field's value as a as a byte.
    `byte[]` | `getByteArray()` Returns the field's value as a `byte` array.
    `int` | `getByteLength()` Returns the length of this field in non-Unicode layout.
    `char` | `getChar()` Returns the field's value as a character.
    `Reader` | `getCharacterStream()` Returns the value of the i'th field as a stream of characters in form of a `java.io.Reader` object.
    `char[]` | `getCharArray()` Returns the field's value as a char array.
    `String` | `getClassNameOfValue()` Returns the fully-qualified name of the Java class whose instances are manufactured if the method `Field.getValue()` is called to retrieve a value from a field.
    `Date` | `getDate()` Returns the field's value as a `Date` object.
    `int` | `getDecimals()` Returns the number of decimals for this field.
    `String` | `getDescription()` Returns a textual description for this field.
    `double` | `getDouble()` Returns the field's value as a double.
    `JCoExtendedFieldMetaData` | `getExtendedFieldMetaData()` Returns the extended field metadata object.
    `float` | `getFloat()` Returns the field's value as a float.
    `int` | `getInt()` Returns the field's value as an int.
    `int` | `getLength()` Returns the max length of the data field.
    `long` | `getLong()` Returns the field's value as a long.
    `String` | `getName()` Returns the name of this field.
    `JCoRecordMetaData` | `getRecordMetaData()` Returns the field metadata object in case of complex object (table or structure), or `null` .
    `short` | `getShort()` Returns the field's value as a short.
    `String` | `getString()` Returns the field's value as a string.
    `JCoStructure` | `getStructure()` Returns the field's value as a `JCoStructure` object.
    `JCoTable` | `getTable()` Returns the field's value as a `JCoTable` object.
    `Date` | `getTime()` Returns the field's value as a `Date` object.
    `int` | `getType()` Returns the type of this field.
    `String` | `getTypeAsString()` Returns the field's type as a string.
    `int` | `getUnicodeByteLength()` Returns the length of this field in Unicode layout.
    `Object` | `getValue()` Returns the field's value as an object.
    `boolean` | `isInitialized()` Checks whether this field has been initialized.
    `boolean` | `isStructure()` Checks whether this field is a structure parameter.
    `boolean` | `isTable()` Checks whether this field is a table parameter.
    `void` | `setValue(byte value)` Sets the specified byte as the field's value.
    `void` | `setValue(byte[] value)` Sets the specified byte array as the field's value.
    `void` | `setValue(char value)` Sets the specified character as the field's value.
    `void` | `setValue(char[] value, int offset, int length)` Sets the specified character array as the field's value.
    `void` | `setValue(double value)` Sets the specified double as the field's value.
    `void` | `setValue(int value)` Sets the specified integer as the field's value.
    `void` | `setValue(JCoStructure value)` Sets the specified structure as the field's value.
    `void` | `setValue(JCoTable value)` Sets the specified table as the field's value.
    `void` | `setValue(long value)` Sets the specified long as the field's value.
    `void` | `setValue(Object value)` Sets the specified object as the field's value.
    `void` | `setValue(short value)` Sets the specified short as the field's value.
    `void` | `setValue(String value)` Sets the specified string as the field's value.
    `Writer` | `write(Writer writer)` Writes the field to a `java.io.Writer`.

- - ### Method Detail

    - #### isInitialized

          boolean isInitialized()

      Checks whether this field has been initialized.
      Returns:
        true if the field has been initialized, `false` otherwise

    - #### isStructure

          boolean isStructure()

      Checks whether this field is a structure parameter.
      Returns:
        true if the field is a structure parameter, `false` otherwise

    - #### isTable

          boolean isTable()

      Checks whether this field is a table parameter.
      Returns:
        true if the field is a table parameter, `false` otherwise

    - #### getName

          String getName()

      Returns the name of this field.
      Returns:
        the name of this field

    - #### getType

          int getType()

      Returns the type of this field.
      Returns:
        the field type

    - #### getByteLength

          int getByteLength()

      Returns the length of this field in non-Unicode layout.
      Returns:
        the length of the field

    - #### getUnicodeByteLength

          int getUnicodeByteLength()

      Returns the length of this field in Unicode layout.
      Returns:
        the length of the field

    - #### getLength

          int getLength()

      Returns the max length of the data field.
      - For the character based types the char length will be returned.
      - For type `STRING` or `XSTRING` 0 will be returned.
      - For type `STRUCTURE` or `TABLE` 0 will be returned.
      - For numerical types the byte length will be returned.
      Note: In case of complex metadata the length for tables and structures can only be requested by their metadata directly.
      Returns:
        data field length

    - #### getDecimals

          int getDecimals()

      Returns the number of decimals for this field. Decimals are only necessary for the data types JCoMetaData.TYPE_BCD and JCoMetaData.TYPE_FLOAT.
      Returns:
        number of decimals for this field.

    - #### getDescription

          String getDescription()

      Returns a textual description for this field.
      Returns:
        a text that describes the field or `null` if none available

    - #### getTypeAsString

          String getTypeAsString()

      Returns the field's type as a string.
      Returns:
        the field's type as a string

    - #### getExtendedFieldMetaData

          JCoExtendedFieldMetaData getExtendedFieldMetaData()

      Returns the extended field metadata object.
      Returns:
        the extended field metadata object or `null` if not available

    - #### getRecordMetaData

          JCoRecordMetaData getRecordMetaData()

      Returns the field metadata object in case of complex object (table or structure), or `null` .
      Returns:
        the field metadata object or `null` if not available

    - #### getClassNameOfValue

          String getClassNameOfValue()

      Returns the fully-qualified name of the Java class whose instances are manufactured if the method `Field.getValue()` is called to retrieve a value from a field.
      Returns:
        the fully-qualified class name of the value object

    - #### getValue

          Object getValue()

      Returns the field's value as an object.
      Returns:
        the field's value as an object
      Throws:
        `ConversionException` - thrown if the value could not be converted to an `Object`

    - #### getString

          String getString()

      Returns the field's value as a string.
      Returns:
        the field's value as a `String` object
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `String`

    - #### getChar

          char getChar()

      Returns the field's value as a character.
      Returns:
        the field's value as a `char`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `char`

    - #### getCharArray

          char[] getCharArray()

      Returns the field's value as a char array.
      Note: In contrast to `getString()` this method does not trim trailing blanks and it does not format date and time fields with `:` or `-` separator chars.
      Returns:
        the field's value as a `char[]`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a char array

    - #### getShort

          short getShort()

      Returns the field's value as a short.
      Returns:
        the field's value as a `short`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `short`

    - #### getInt

          int getInt()

      Returns the field's value as an int.
      Returns:
        the field's value as an `int`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `int`

    - #### getLong

          long getLong()

      Returns the field's value as a long.
      Returns:
        the field's value as a `long`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `long`

    - #### getBigInteger

          BigInteger getBigInteger()

      Returns the field's value as a `BigInteger` object.
      Returns:
        the field's value as a `BigInteger` object
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `BigInteger`

    - #### getDouble

          double getDouble()

      Returns the field's value as a double.
      Returns:
        the field's value as a `double`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `double`

    - #### getByte

          byte getByte()

      Returns the field's value as a as a byte.
      Returns:
        the field's value as a `byte`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `byte`

    - #### getFloat

          float getFloat()

      Returns the field's value as a float. Use setValue(float value, ...) and getFloat(...) methods only if you operate with float values. A double value converted to a float and back to a double may also differ from the original value. Also don't mix those methods, because setting values with setValue(float value, ...) and getting them using getDouble(...) may not return the same value.
      Returns:
        the field's value as a `float`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `float`

    - #### getBigDecimal

          BigDecimal getBigDecimal()

      Returns the field's value as a `BigDecimal` object.
      Returns:
        the field's value as a `BigDecimal` object
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `BigDecimal`

    - #### getDate

          Date getDate()

      Returns the field's value as a `Date` object.
      Returns:
        the field's value as a `Date` object
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `Date`

    - #### getTime

          Date getTime()

      Returns the field's value as a `Date` object.
      Returns:
        the field's value as a `Date` object
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `Date`

    - #### getByteArray

          byte[] getByteArray()

      Returns the field's value as a `byte` array.
      Returns:
        the field's value as a `byte[]`
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `byte[]` array.

    - #### getBinaryStream

          InputStream getBinaryStream()

      Returns the field's value as a stream of uninterpreted bytes in form of a `java.io.InputStream` object.
      Returns:
        the field's value as an `java.io.InputStream`
      Throws:
        `ConversionException` - thrown if the value could not be converted to an `java.io.InputStream`

    - #### getCharacterStream

          Reader getCharacterStream()

      Returns the value of the i'th field as a stream of characters in form of a `java.io.Reader` object.
      Returns:
        the field's value as an `java.io.Reader`
      Throws:
        `ConversionException` - thrown if the value could not be converted to an `java.io.Reader`

    - #### getTable

          JCoTable getTable()

      Returns the field's value as a `JCoTable` object.
      Returns:
        the field's value as a table
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `JCoTable`

    - #### getStructure

          JCoStructure getStructure()

      Returns the field's value as a `JCoStructure` object.
      Returns:
        the field's value as a structure
      Throws:
        `ConversionException` - thrown if the value could not be converted to a `JCoStructure`

    - #### setValue

          void setValue(Object value)

      Sets the specified object as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(String value)

      Sets the specified string as the field's value. To set a value back to its initial type specific setting pass `""`, i.e. an empty string, or `null`
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(char value)

      Sets the specified character as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(char[] value,
                      int offset,
                      int length)

      Sets the specified character array as the field's value.
      Parameters:
        `value` - the new value of this field
        `offset` - in the value
        `length` - number of chars
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(short value)

      Sets the specified short as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(int value)

      Sets the specified integer as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(long value)

      Sets the specified long as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(double value)

      Sets the specified double as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(byte[] value)

      Sets the specified byte array as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(byte value)

      Sets the specified byte as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(JCoStructure value)

      Sets the specified structure as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### setValue

          void setValue(JCoTable value)

      Sets the specified table as the field's value.
      Parameters:
        `value` - the new value of this field
      Throws:
        `ConversionException` - thrown if the value could not be converted to its internal representation

    - #### write

          Writer write(Writer writer)
                       throws IOException

      Writes the field to a `java.io.Writer`.

      See JCoRecord.write(int, Writer) for details.

      Parameters:
        `writer` - writer instance used to write
      Returns:
        the instance passed as parameter writer
      Throws:
        `ConversionException` - if the field is complex.
        `IOException` - if writer throws IOException
      Since:
        JCo 3.0.7
      See Also:
        `JCoRecord.write(int, Writer)`

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