private Simple next(DataModelSource source) throws IOException {
DataModelReflection next = source.next();
if (next != null) {
return SIMPLE.toObject(next);
}
return null;
}
/**
* Creates a new instance.
*
* @param conf current configuration
* @param definition data type
* @param pathExpression the source path (can include wildcard)
* @throws IOException if failed to create instance
* @throws IllegalArgumentException if some parameters were {@code null}
*/
@SuppressWarnings("unchecked")
public TemporaryDataModelSource(
Configuration conf, DataModelDefinition<?> definition, String pathExpression)
throws IOException {
this.conf = conf;
this.definition = (DataModelDefinition<Object>) definition;
this.object = definition.toObject(definition.newReflection().build());
Path path = new Path(pathExpression);
this.fs = path.getFileSystem(conf);
FileStatus[] list = fs.globStatus(path);
List<Path> paths = new ArrayList<>();
for (int i = 0; i < list.length; i++) {
paths.add(list[i].getPath());
}
this.rest = paths.iterator();
}
@Override
public DataModelReflection next() throws IOException {
while (true) {
if (current == null) {
if (rest.hasNext() == false) {
return null;
}
current = TemporaryStorage.openInput(conf, definition.getModelClass(), rest.next());
}
if (current.readTo(object)) {
break;
} else {
current.close();
current = null;
}
}
return definition.toReflection(object);
}
/**
* Adds a property to the building object.
*
* @param name the property name
* @param value the property value (nullable)
* @return this object (for method chain)
* @throws IllegalArgumentException if the property is not defined (on {@code check = true}), or
* the property value has inconsistent type, or some parameters were {@code null}
* @throws IllegalStateException the property has been already added
*/
public Builder<T> add(PropertyName name, Object value) {
if (name == null) {
throw new IllegalArgumentException("name must not be null"); // $NON-NLS-1$
}
if (properties.containsKey(name)) {
throw new IllegalStateException(
MessageFormat.format("The property \"{0}\" was already set in {1}", name, definition));
}
PropertyType type = definition.getType(name);
if (type != null && value != null && type.getRepresentation().isInstance(value) == false) {
throw new IllegalArgumentException(
MessageFormat.format(
"The property \"{0}\" must be type of {1}, but was {2} ({3})",
name, type, value, definition));
}
properties.put(name, value);
return this;
}
private DataModelReflection num(Integer number, double value) {
Simple simple = new Simple();
simple.number = number;
simple.doubleValue = value;
return SIMPLE.toReflection(simple);
}
private DataModelReflection datetime(Calendar dateTime) {
Simple simple = new Simple();
simple.datetimeValue = dateTime;
return SIMPLE.toReflection(simple);
}
private DataModelReflection obj(Integer number, String text) {
Simple simple = new Simple();
simple.number = number;
simple.text = text;
return SIMPLE.toReflection(simple);
}