org.apache.fop.afp.util
Class StructuredFieldReader

java.lang.Object
  org.apache.fop.afp.util.StructuredFieldReader

public class StructuredFieldReader
extends java.lang.Object

A helper class to read structured fields from a MO:DCA document. Each component of a mixed object document is explicitly defined and delimited in the data. This is accomplished through the use of MO:DCA data structures, called structured fields. Structured fields are used to envelop document components and to provide commands and information to applications using the data. Structured fields may contain one or more parameters. Each parameter provides one value from a set of values defined by the architecture.
MO:DCA structured fields consist of two parts: an introducer that identifies the length and type of the structured field, and data that provides the structured field's effect. The data is contained in a set of parameters, which can consist of other data structures and data elements. The maximum length of a structured field is 32767 bytes.

Constructor Summary

StructuredFieldReader(java.io.InputStream inputStream)
The constructor for the StructuredFieldReader

Method Summary

byte[]

getNext(byte[] identifier) Get the next structured field as identified by the identifier parameter (this must be a valid MO:DCA structured field).

Methods inherited from class java.lang.Object

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

Constructor Detail

StructuredFieldReader

public StructuredFieldReader(java.io.InputStream inputStream)

The constructor for the StructuredFieldReader

Parameters:

inputStream - the input stream to process

Method Detail

getNext

public byte[] getNext(byte[] identifier)
               throws java.io.IOException

Get the next structured field as identified by the identifier parameter (this must be a valid MO:DCA structured field). Note: The returned data does not include the field length and identifier!

Parameters:

identifier - the three byte identifier

Returns:

the next structured field or null when there are no more

Throws:

java.io.IOException - if an I/O exception occurred