in src/main/java/software/amazon/encryption/s3/internal/MultiFileOutputStream.java [58:69]
public MultiFileOutputStream(File root, String namePrefix) {
if (root == null || !root.isDirectory() || !root.canWrite()) {
throw new IllegalArgumentException(root
+ " must be a writable directory");
}
if (namePrefix == null || namePrefix.trim().length() == 0) {
throw new IllegalArgumentException(
"Please specify a non-empty name prefix");
}
this.root = root;
this.namePrefix = namePrefix;
}