protected Diff<Document, Diff<Fieldable, DocumentDiff>> compare(
IndexReader reader1, IndexReader reader2, String keyFieldName)
throws IOException, ParseException {
Diff<Document, Diff<Fieldable, DocumentDiff>> result =
new Diff<Document, Diff<Fieldable, DocumentDiff>>();
for (int docId = 0; docId < reader1.numDocs(); docId++) {
if (!reader1.isDeleted(docId)) {
Document doc1 = reader1.document(docId);
Field keyField = doc1.getField(keyFieldName);
if (keyField == null) {
throw new IllegalArgumentException(
"Key field " + keyFieldName + " should be defined in all docs in the index");
}
Document doc2 = findByKey(reader2, keyField);
if (doc2 == null) {
result.addAdded(doc1);
} else {
Diff<Fieldable, DocumentDiff> diff =
CompareUtils.diff(keyField.stringValue(), doc1, doc2);
if (!diff.isEquals()) {
result.addDiff(diff);
}
}
}
}
for (int docId = 0; docId < reader2.numDocs(); docId++) {
if (!reader2.isDeleted(docId)) {
Document doc2 = reader2.document(docId);
Field keyField = doc2.getField(keyFieldName);
if (keyField == null) {
throw new IllegalArgumentException(
"Key field '" + keyFieldName + "' should be defined in all docs in the index");
}
Document doc1 = findByKey(reader1, keyField);
if (doc1 == null) {
result.addRemoved(doc2);
}
}
}
return result;
}
