Class WstxInputSource

  • Direct Known Subclasses:
    BaseInputSource

    public abstract class WstxInputSource
    extends Object
    Interface that defines API actual parsers (stream readers) can use to read input from various input sources. Needed to abstract out details of getting input from primary input files, secondary (potentially cached) referenced documents, and from parsed entities, as well as for allowing hierarchic location information for error reporting.
    • Field Detail

      • mParent

        protected final WstxInputSource mParent
        Parent in input source stack
      • mFromEntity

        protected final String mFromEntity
        Name/id of the entity that was expanded to produce this input source; null if not entity-originated. Used for catching recursive expansions of entities.
      • mScopeId

        protected int mScopeId
        Scope of the reader when this entity was initially expanded. Snapshot that will generally be used by the reader to match scoping limitations, such as proper nesting entity expansion with respect to element and declaration nesting.
      • mEntityDepth

        protected int mEntityDepth
        Number of parent entities that have been expanded to get to this input source; 0 for root-level input that is not generated via entity expansion.
    • Method Detail

      • overrideSource

        public abstract void overrideSource​(URL url)
        Method that can be called to override originally defined source.
        Parameters:
        url - New base URL to set; may be null.
        Since:
        4.0
      • isOrIsExpandedFrom

        public boolean isOrIsExpandedFrom​(String entityId)
        Method that checks if this input source expanded from the specified entity id, directly or by ancestor.

        Note that entity ids are expected to have been interned (using whatever uniqueness mechanism used), and thus can be simply identity checked.

      • fromInternalEntity

        public abstract boolean fromInternalEntity()
        Returns:
        True, if this input source was directly expanded from an internal entity (general, parsed); false if not (from external entity, DTD ext. subset, main document)
      • getPublicId

        public abstract String getPublicId()
      • getSystemId

        public abstract String getSystemId()
      • getLocation

        protected abstract WstxInputLocation getLocation()
        Method usually called to get a parent location for another input source. Works since at this point context (line, row, chars) information has already been saved to this object.
      • getLocation

        public abstract WstxInputLocation getLocation​(long total,
                                                      int row,
                                                      int col)
      • getEntityId

        public String getEntityId()
      • getScopeId

        public int getScopeId()
      • getEntityDepth

        public int getEntityDepth()
      • initInputLocation

        public final void initInputLocation​(WstxInputData reader,
                                            int currScopeId,
                                            int entityDepth)
        Method called by Reader when current input has changed to come from this input source. Should reset/initialize input location information Reader keeps, for error messages to work ok.
        Parameters:
        reader - Reader whose data structures are to be used for returning data read
        currScopeId -
      • doInitInputLocation

        protected abstract void doInitInputLocation​(WstxInputData reader)
      • readInto

        public abstract int readInto​(WstxInputData reader)
                              throws IOException,
                                     XMLStreamException
        Method called to read at least one more char from input source, and update input data appropriately.
        Returns:
        Number of characters read from the input source (at least 1), if it had any input; -1 if input source has no more input.
        Throws:
        IOException
        XMLStreamException
      • readMore

        public abstract boolean readMore​(WstxInputData reader,
                                         int minAmount)
                                  throws IOException,
                                         XMLStreamException
        Method called by reader when it has to have at least specified number of consequtive input characters in its buffer, and it currently does not have. If so, it asks input source to do whatever it has to do to try to get more data, if possible (including moving stuff in input buffer if necessary and possible).
        Returns:
        True if input source was able to provide specific number of characters or more; false if not. In latter case, source is free to return zero or more characters any way.
        Throws:
        IOException
        XMLStreamException
      • saveContext

        public abstract void saveContext​(WstxInputData reader)
        Method Reader calls when this input source is being stored, when a nested input source gets used instead (due to entity expansion). Needs to get location info from Reader and store it in this Object.
      • restoreContext

        public abstract void restoreContext​(WstxInputData reader)
        Method Reader calls when this input source is resumed as the current source. Needs to update Reader's input location data used for error messages etc.
      • close

        public abstract void close()
                            throws IOException
        Method reader calls for this input source when it has encountered EOF. This may or may not close the underlying stream/reader; what happens depends on configuration
        Throws:
        IOException
      • closeCompletely

        public abstract void closeCompletely()
                                      throws IOException
        Method reader MAY call to force full closing of the underlying input stream(s)/reader(s). No checks are done regarding configuration, but input source object is to deal gracefully with multiple calls (ie. it's not an error for reader to call this more than once).
        Throws:
        IOException