/** Serializes the given page. */
protected List<String> serializePage(PdfPage page) {
if (page == null) {
return null;
}
List<String> lines = new ArrayList<>();
// Obtain the features to serialize.
List<PdfFeature> features = getFeaturesToSerialize();
if (features != null) {
for (PdfFeature f : features) {
/**
* This feature was added for David. He needs the paragraphs with the associated lines.
* Remove it if it not needed anymore.
*/
if (f == PdfFeature.paragraphs_with_lines) {
List<PdfTextParagraph> paragraphs = page.getParagraphs();
for (PdfElement para : paragraphs) {
lines.add(serializeElement(para));
for (PdfTextLine line : para.getTextLines()) {
lines.add(serializeElement(line));
}
}
continue;
}
// Obtain the elements by feature.
List<? extends PdfElement> elements = page.getElementsByFeature(f);
List<String> serialized = serializeElementsWithRespectToRoles(elements);
if (serialized != null && !serialized.isEmpty()) {
lines.addAll(serialized);
}
}
}
return lines;
}
/** Serializes the given text element. */
protected String serializeTextElement(PdfTextElement element) {
if (element == null) {
return null;
}
String text =
element.getText(
getSerializePunctuationMarks(), getSerializeSubscripts(), getSerializeSuperscripts());
if (text == null || text.trim().isEmpty()) {
return null;
}
List<String> fields = new ArrayList<>();
// Add feature name.
PdfFeature feature = element.getFeature();
fields.add(feature != null ? feature.getFieldName() : "");
// Add text.
fields.add(text.replaceAll("\t", " "));
// Add page.
PdfPage page = element.getPage();
fields.add(page != null ? String.valueOf(page.getPageNumber()) : "");
// Add bounding box.
Rectangle rect = element.getRectangle();
fields.add(rect != null ? String.valueOf(rect.getMinX()) : "");
fields.add(rect != null ? String.valueOf(rect.getMinY()) : "");
fields.add(rect != null ? String.valueOf(rect.getMaxX()) : "");
fields.add(rect != null ? String.valueOf(rect.getMaxY()) : "");
// Add most common font.
PdfFont font = element.getFont();
fields.add(font != null ? font.getId() : "");
fields.add(String.valueOf(element.getFontsize()));
// Add most common color.
PdfColor color = element.getColor();
fields.add(color != null ? color.getId() : "");
// Add font of first and last character.
PdfFont firstCharacterFont = null;
PdfFont lastCharacterFont = null;
PdfColor firstCharacterColor = null;
PdfColor lastCharacterColor = null;
float firstCharacterFontsize = 0;
float lastCharacterFontsize = 0;
List<PdfCharacter> characters = element.getTextCharacters();
if (characters != null && !characters.isEmpty()) {
Collections.sort(characters, new Comparators.MinXComparator());
PdfCharacter firstCharacter = characters.get(0);
PdfCharacter lastCharacter = characters.get(characters.size() - 1);
if (firstCharacter != null) {
firstCharacterFont = firstCharacter.getFont();
firstCharacterFontsize = firstCharacter.getFontsize();
firstCharacterColor = firstCharacter.getColor();
}
if (lastCharacter != null) {
lastCharacterFont = lastCharacter.getFont();
lastCharacterFontsize = lastCharacter.getFontsize();
lastCharacterColor = lastCharacter.getColor();
}
}
// Append font and color of first character.
fields.add(firstCharacterFont != null ? firstCharacterFont.getId() : "");
fields.add(String.valueOf(firstCharacterFontsize));
fields.add(firstCharacterColor != null ? firstCharacterColor.getId() : "");
// Append font and color of last character.
fields.add(lastCharacterFont != null ? lastCharacterFont.getId() : "");
fields.add(String.valueOf(lastCharacterFontsize));
fields.add(lastCharacterColor != null ? lastCharacterColor.getId() : "");
// Add role.
PdfRole role = element.getRole();
fields.add(role != null ? role.name : "");
return CollectionUtils.join(fields, "\t");
}