How to use

getAppearanceStream

method

in

org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceEntry

private PDAppearanceContentStream getAppearanceEntryAsContentStream(
     PDAppearanceEntry appearanceEntry, boolean compress) throws IOException
{
  PDAppearanceStream appearanceStream = appearanceEntry.getAppearanceStream();
  setTransformationMatrix(appearanceStream);
  // ensure there are resources
  PDResources resources = appearanceStream.getResources();
  if (resources == null)
  {
    resources = new PDResources();
    appearanceStream.setResources(resources);
  }
  return new PDAppearanceContentStream(appearanceStream, compress);
}

/**
 * Returns the appearance stream for this annotation, if any. The annotation state is taken into account, if
 * present.
 */
public PDAppearanceStream getNormalAppearanceStream()
{
  PDAppearanceDictionary appearanceDict = getAppearance();
  if (appearanceDict == null)
  {
    return null;
  }
  PDAppearanceEntry normalAppearance = appearanceDict.getNormalAppearance();
  if (normalAppearance == null)
  {
    return null;
  }
  if (normalAppearance.isSubDictionary())
  {
    COSName state = getAppearanceState();
    return normalAppearance.getSubDictionary().get(state);
  }
  else
  {
    return normalAppearance.getAppearanceStream();
  }
}

if (appearance != null && appearance.isStream())
  appearanceStream = appearance.getAppearanceStream();

private static void addAllAppearances(PDAppearanceEntry appearance, List<PDAppearanceStream> list) {
  if (appearance == null) {
    return;
  }
  if (appearance.isStream()) {
    PDAppearanceStream appearanceStream = appearance.getAppearanceStream();
    if (appearanceStream != null) {
      list.add(appearanceStream);
    }
  } else {
    for (PDAppearanceStream appearanceStream : appearance.getSubDictionary().values()) {
      if (appearanceStream != null) {
        list.add(appearanceStream);
      }
    }
  }
}

private PDAppearanceContentStream getAppearanceEntryAsContentStream(PDAppearanceEntry appearanceEntry) throws IOException
{
  PDAppearanceStream appearanceStream = appearanceEntry.getAppearanceStream();
  setTransformationMatrix(appearanceStream);
  return new PDAppearanceContentStream(appearanceStream);
}

private Set<String> getAppearanceEntryDependencies(PDAppearanceEntry entry, COSBase entryLink) {
  Set<String> res = new HashSet<>();
  if (entry.isStream()) {
    res.add(getAppearanceStreamDependencies(entry.getAppearanceStream(), entryLink));
  } else {
    for (Map.Entry<COSName, PDAppearanceStream> mapEntry : entry.getSubDictionary().entrySet()) {
      res.add(getAppearanceStreamDependencies(mapEntry.getValue(),
          ((COSDictionary) entry.getCOSObject()).getItem(mapEntry.getKey())));
    }
  }
  return res;
}

private void addContentStreamsFromAppearanceEntry(COSBase appearanceEntry, List<PDContentStream> appearances) {
  if (appearanceEntry != null) {
    PDAppearanceEntry newAppearance = new PDAppearanceEntry(appearanceEntry);
    if (newAppearance.isStream()) {
      addAppearance(appearances, newAppearance.getAppearanceStream());
    } else {
      Map<COSName, PDAppearanceStream> subDictionary = newAppearance.getSubDictionary();
      for (PDAppearanceStream stream : subDictionary.values()) {
        addAppearance(appearances, stream);
      }
    }
  }
}

/**
 * Returns the appearance stream for this annotation, if any. The annotation state is taken into account, if
 * present.
 */
public PDAppearanceStream getNormalAppearanceStream()
{
  PDAppearanceDictionary appearanceDict = getAppearance();
  if (appearanceDict == null)
  {
    return null;
  }
  PDAppearanceEntry normalAppearance = appearanceDict.getNormalAppearance();
  if (normalAppearance == null)
  {
    return null;
  }
  if (normalAppearance.isSubDictionary())
  {
    COSName state = getAppearanceState();
    return normalAppearance.getSubDictionary().get(state);
  }
  else
  {
    return normalAppearance.getAppearanceStream();
  }
}

/**
 * Returns the appearance stream for this annotation, if any. The annotation state is taken into account, if
 * present.
 */
public PDAppearanceStream getNormalAppearanceStream()
{
  PDAppearanceDictionary appearanceDict = getAppearance();
  if (appearanceDict == null)
  {
    return null;
  }
  PDAppearanceEntry normalAppearance = appearanceDict.getNormalAppearance();
  if (normalAppearance == null)
  {
    return null;
  }
  if (normalAppearance.isSubDictionary())
  {
    COSName state = getAppearanceState();
    return normalAppearance.getSubDictionary().get(state);
  }
  else
  {
    return normalAppearance.getAppearanceStream();
  }
}

void handleOpacity(float opacity) throws IOException
{
  if (opacity < 1)
  {
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setStrokingAlphaConstant(opacity);
    gs.setNonStrokingAlphaConstant(opacity);
    
    PDAppearanceStream appearanceStream = appearanceEntry.getAppearanceStream();
    
    PDResources resources = appearanceStream.getResources();
    if (resources == null)
    {
      resources = new PDResources();
      appearanceStream.setResources(resources);
      contentStream.setResources(resources);
    }
    contentStream.setGraphicsStateParameters(gs);
  }
}

if (appearance != null && appearance.isStream())
  appearanceStream = appearance.getAppearanceStream();

if (appearance != null && appearance.isStream())
  appearanceStream = appearance.getAppearanceStream();