/**
* @param args
* <p>read *.avro file convert into java tree view. return tree
*/
public Tree generateInputTree() {
GenericDatumReader<GenericData> genericReader = new GenericDatumReader<GenericData>();
// DatumReader inputDatumReader = new SpecificDatumReader(UserInfo.class);
DataFileReader<GenericData> dataFileReader;
Tree root = new Tree(); // root tree for Tree data struture
try {
///
// home/lali/old/svn/trunck/eclipse/data-mapper/org.wso2.developerstudio.visualdatamapper.diagram/resource/inputs.avro
String path =
DataMapperCreationWizardPage
.avroFilePath; // path for avro file selected in Create Datamapper Diagram swizard
dataFileReader = new DataFileReader<GenericData>(new File(path), genericReader);
Schema schm = dataFileReader.getSchema();
multipleData = false;
root.setName(schm.getName());
List<Field> list = dataFileReader.getSchema().getFields();
Iterator<Field> it = list.iterator();
while (it.hasNext()) {
Field field = it.next();
fetchToTree(field, root);
}
} catch (IOException e) {
e.printStackTrace();
}
return root;
}
/*
* for each avro field, search for nested schema.
* if field is nested, create tree and recursive
* else fetch field as a element
*/
private static void fetchToTree(Field field, Tree parent) {
// System.out.println(" Field: " + field.name());
if (field.schema().getType().toString().equalsIgnoreCase("RECORD")) {
// if(!multipleData)
// multipleData = true;
//
Tree child = new Tree(parent);
child.setName(field.name());
List<Field> list = field.schema().getFields();
Iterator<Field> it = list.iterator();
while (it.hasNext()) {
Field fieldOfField = it.next();
fetchToTree(fieldOfField, child);
}
parent.getTrees().add(child);
} else if (field.schema().getType().getName().equalsIgnoreCase("ARRAY")) {
if (field.schema().getElementType().getType().name().toString().equalsIgnoreCase("RECORD")) {
if (!multipleData) multipleData = true;
Schema arraySchema = field.schema().getElementType();
Tree childParent = new Tree(parent);
childParent.setName(field.name()); // employee
// parent.getTrees().add(childParent);
// Tree child = new Tree(childParent);
// child.setName(arraySchema.getName());//employeerecord
List<Field> list = arraySchema.getFields();
Iterator<Field> it = list.iterator();
while (it.hasNext()) {
Field fieldOfField = it.next();
fetchToTree(fieldOfField, childParent);
}
parent.getTrees().add(childParent);
}
} else {
Element elementNew = new Element(parent);
elementNew.setName(field.name());
parent.getElements().add(elementNew);
}
// return parent;
}