var SahiFrameWork_PDFFields = function(){};
SahiFrameWork_PDFFields.prototype.load = function(fileName) {
	_sahi.print("In load");
	var input = new java.io.File(fileName);  // The PDF file from where you would like to extract
	var pd = Packages.org.apache.pdfbox.Loader.loadPDF(input);
	var docCatalog = pd.getDocumentCatalog(); 
	var acroForm = docCatalog.getAcroForm(); 
	this.fields = acroForm.getFields();
}
SahiFrameWork_PDFFields.prototype.setKeyAttribute = function($keyAttribute) {
	this.keyAttribute = $keyAttribute;
}
SahiFrameWork_PDFFields.prototype.getKeyAttribute = function() {
	return this.keyAttribute || "getPartialName";
}

// Prints all the editable fields  and it's value that are available in the pdf.
SahiFrameWork_PDFFields.prototype.printAll = function() {
	for (var i=0; i<this.fields.size(); i++) {
		var s = "";
		var field = this.fields.get(i);
		var $json = _sahi.toJSON(field);
		s += "\n---";
		s += ("\nFullyQualifiedName : " + field.getFullyQualifiedName());
		s += ("\nPartialName : " + field.getPartialName());
		s += ("\nAlternateFieldName : " + field.getAlternateFieldName());
		s += ("\nFieldType : " + field.getFieldType());
		s += ("\nValue : " + field.getValue());
		if (field.isChecked) s += ("\nChecked : " + field.isChecked());
		var $s = s.replace(/\n/g, '<br/>');
		_log($s);
	}
}
SahiFrameWork_PDFFields.prototype.getField = function($name) {
	for (var i=0; i<this.fields.size(); i++) {
		var field = this.fields.get(i);
		var attr = field[this.getKeyAttribute()]();
		if (attr == $name) return field;
	}
	return null;
}

// Gets the value of editable fields in pdf.

// $name: By default PartialName of the field.
// Can be changed by calling setKeyAttribute() method  and passing the attribute.
// setKeyAttribute("getAlternateFieldName")
// getValue("Name of Dependent")
SahiFrameWork_PDFFields.prototype.getValue = function($name) {
	var $field = this.getField($name);
	if ($field == null) return null;
	return $field.getValue();
}

// Returns true if checkbox is checked. 
SahiFrameWork_PDFFields.prototype.isChecked = function($name) {
	var $field = this.getField($name);
	if ($field == null) return null;
	return $field.isChecked();	
}