Class PDFXref
There are two forms of the PDFXref, destinguished by absolutely nothing. The first type of PDFXref is used as indirect references in a PDFObject. In this type, the id is an index number into the object cross reference table. The id will range from 0 to the size of the cross reference table.
The second form is used in the Java representation of the cross reference table. In this form, the id is the file position of the start of the object in the PDF file. See the use of both of these in the PDFFile.dereference() method, which takes a PDFXref of the first form, and uses (internally) a PDFXref of the second form.
This is an unhappy state of affairs, and should be fixed. Fortunatly, the two uses have already been factored out as two different methods.
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Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionint
get the character index into the file of the start of this objectint
get the generation of this objectint
getID()
get the object number of this objectGet the object this reference refers to, or null if it hasn't been set.void
Set the object this reference refers to.
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Field Details
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id
private int id -
generation
private int generation -
reference
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Constructor Details
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PDFXref
public PDFXref(int id, int gen) create a new PDFXref, given a parsed id and generation. -
PDFXref
public PDFXref(byte[] line) create a new PDFXref, given a sequence of bytes representing the fixed-width cross reference table line
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Method Details
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getFilePos
public int getFilePos()get the character index into the file of the start of this object -
getGeneration
public int getGeneration()get the generation of this object -
getID
public int getID()get the object number of this object -
getObject
Get the object this reference refers to, or null if it hasn't been set.- Returns:
- the object if it exists, or null if not
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setObject
Set the object this reference refers to.
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