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## org.apache.fop.afp.modca
Class AbstractAFPObject

    java.lang.Object
      org.apache.fop.afp.modca.AbstractAFPObject

All Implemented Interfaces:
  Streamable

Direct Known Subclasses:
  AbstractGraphicsDrawingOrder, AbstractStructuredObject, AbstractTriplet, ImageCellPosition, ImageInputDescriptor, ImageOutputControl, ImageRasterData, ImageSizeParameter, MapPageOverlay, MapPageSegment, NoOperation, ObjectAreaPosition, PresentationTextData

    public abstract class AbstractAFPObject

extends java.lang.Object
implements Streamable

This is the base class for all data stream objects. Page objects are responsible for building and generating the binary datastream in an AFP format.

Nested Class Summary
`static interface` | `AbstractAFPObject.Category` structured field category codes
`static interface` | `AbstractAFPObject.Type` structured field type codes

Field Summary
`protected static org.apache.commons.logging.Log` | `LOG` Static logging instance
`protected static byte` | `SF_CLASS` the structured field class id
`protected static int` | `SF_HEADER_LENGTH` Length of bytes of a Structured Field Header

Constructor Summary
`AbstractAFPObject()`

Method Summary
`protected void` | `copySF(byte[] data, byte type, byte category)` Copies the template structured field data array to the given byte array
`protected static void` | `copySF(byte[] data, byte clazz, byte type, byte category)` Copies the template structured field data array to the given byte array
`protected static java.lang.String` | `truncate(java.lang.String str, int maxLength)` Truncates the string as necessary
`protected static void` | `writeChunksToStream(byte[] data, byte[] dataHeader, int lengthOffset, int maxChunkLength, java.io.OutputStream os)` Writes data chunks to a given outputstream
`protected
`<S extends Streamable> void`
` | `writeObjects(java.util.Collection<S> objects, java.io.OutputStream os)` Writes a collection of Streamable to the AFP Datastream.

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

Methods inherited from interface org.apache.fop.afp.Streamable
`writeToStream`

Field Detail

### LOG

    protected static final org.apache.commons.logging.Log LOG

  Static logging instance

### SF_CLASS

    protected static final byte SF_CLASS

  the structured field class id

  See Also:
    Constant Field Values

### SF_HEADER_LENGTH

    protected static final int SF_HEADER_LENGTH

  Length of bytes of a Structured Field Header

Constructor Detail

### AbstractAFPObject

    public AbstractAFPObject()

Method Detail

### copySF

    protected void copySF(byte[] data,
                          byte type,
                          byte category)

  Copies the template structured field data array to the given byte array

  Parameters:
    `data` - the structured field data byte array
    `type` - the type code
    `category` - the category code

### copySF

    protected static void copySF(byte[] data,
                                 byte clazz,
                                 byte type,
                                 byte category)

  Copies the template structured field data array to the given byte array

  Parameters:
    `data` - the structured field data byte array
    `clazz` - the class code
    `type` - the type code
    `category` - the category code

### writeObjects

    protected <S extends Streamable> void writeObjects(java.util.Collection<S> objects,
                                                       java.io.OutputStream os)
                         throws java.io.IOException

  Writes a collection of Streamable to the AFP Datastream.

  Type Parameters:
    `S` - Streamable view of an AFPObject
  Parameters:
    `objects` - a list of AFPObjects
    `os` - The stream to write to
  Throws:
    `java.io.IOException` - an I/O exception of some sort has occurred.

### writeChunksToStream

    protected static void writeChunksToStream(byte[] data,
                                              byte[] dataHeader,
                                              int lengthOffset,
                                              int maxChunkLength,
                                              java.io.OutputStream os)
                                       throws java.io.IOException

  Writes data chunks to a given outputstream

  Parameters:
    `data` - the data byte array
    `dataHeader` - the header data
    `lengthOffset` - offset of length field in data chunk
    `maxChunkLength` - the maximum chunk length
    `os` - the outputstream to write to
  Throws:
    `java.io.IOException` - thrown if an I/O exception of some sort has occurred.

### truncate

    protected static java.lang.String truncate(java.lang.String str,
                                               int maxLength)

  Truncates the string as necessary

  Parameters:
    `str` - a character string
    `maxLength` - the maximum length allowed for the string
  Returns:
    a possibly truncated string

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