static GlobalMetaData mergeInto(
FileMetaData toMerge, GlobalMetaData mergedMetadata, boolean strict) {
MessageType schema = null;
Map<String, Set<String>> newKeyValues = new HashMap<String, Set<String>>();
Set<String> createdBy = new HashSet<String>();
if (mergedMetadata != null) {
schema = mergedMetadata.getSchema();
newKeyValues.putAll(mergedMetadata.getKeyValueMetaData());
createdBy.addAll(mergedMetadata.getCreatedBy());
}
if ((schema == null && toMerge.getSchema() != null)
|| (schema != null && !schema.equals(toMerge.getSchema()))) {
schema = mergeInto(toMerge.getSchema(), schema, strict);
}
for (Entry<String, String> entry : toMerge.getKeyValueMetaData().entrySet()) {
Set<String> values = newKeyValues.get(entry.getKey());
if (values == null) {
values = new HashSet<String>();
newKeyValues.put(entry.getKey(), values);
}
values.add(entry.getValue());
}
createdBy.add(toMerge.getCreatedBy());
return new GlobalMetaData(schema, newKeyValues, createdBy);
}
static ParquetMetadata mergeFooters(Path root, List<Footer> footers) {
String rootPath = root.toUri().getPath();
GlobalMetaData fileMetaData = null;
List<BlockMetaData> blocks = new ArrayList<BlockMetaData>();
for (Footer footer : footers) {
String footerPath = footer.getFile().toUri().getPath();
if (!footerPath.startsWith(rootPath)) {
throw new ParquetEncodingException(
footerPath + " invalid: all the files must be contained in the root " + root);
}
footerPath = footerPath.substring(rootPath.length());
while (footerPath.startsWith("/")) {
footerPath = footerPath.substring(1);
}
fileMetaData = mergeInto(footer.getParquetMetadata().getFileMetaData(), fileMetaData);
for (BlockMetaData block : footer.getParquetMetadata().getBlocks()) {
block.setPath(footerPath);
blocks.add(block);
}
}
return new ParquetMetadata(fileMetaData.merge(), blocks);
}