Package net.hydromatic.morel.eval

Class Files.UnknownFile

java.lang.Object

net.hydromatic.morel.eval.Files.AbstractFile

net.hydromatic.morel.eval.Files.UnknownFile

All Implemented Interfaces:

File, TypedValue

Direct Known Subclasses:

Files.UnknownChildFile

Enclosing class:

Files

private static class Files.UnknownFile
extends Files.AbstractFile

File that we have not yet categorized. We don't know whether it is a directory.

Its type is an empty record type (because we don't know the files in the directory, or the fields of the data file).

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final Type.Key	PROGRESSIVE_UNIT	Key for the type "{...}", the progressive record with no (as yet known) fields.
(package private) static final Type.Key	PROGRESSIVE_UNIT_LIST	Key for the type "{...} list", the list of progressive records with no (as yet known) fields.

Fields inherited from class net.hydromatic.morel.eval.Files.AbstractFile

baseName, fileType, ioFile

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	UnknownFile(File file, Files.FileType fileType)

Method Summary

Modifier and Type	Method	Description
File	discoverField(TypeSystem typeSystem, String fieldName)	Tries to expand the type to include the given field name.
File	expand()	Expands this file to a file with a more precise type.
Type.Key	typeKey()	Key from which the type of this value can be constructed.
<V> V	valueAs(Class<V> clazz)	Returns the value cast as a particular type.

Methods inherited from class net.hydromatic.morel.eval.Files.AbstractFile

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.hydromatic.morel.type.TypedValue

fieldValueAs, fieldValueAs

Field Details

PROGRESSIVE_UNIT

static final Type.Key PROGRESSIVE_UNIT

Key for the type "{...}", the progressive record with no (as yet known) fields.

PROGRESSIVE_UNIT_LIST

static final Type.Key PROGRESSIVE_UNIT_LIST

Key for the type "{...} list", the list of progressive records with no (as yet known) fields.

Constructor Details

UnknownFile

protected UnknownFile(File file,
 Files.FileType fileType)

Method Details

valueAs

public <V> V valueAs(Class<V> clazz)

Description copied from interface: TypedValue

Returns the value cast as a particular type.

typeKey

public Type.Key typeKey()

Description copied from interface: TypedValue

Key from which the type of this value can be constructed.

expand

public File expand()

Description copied from interface: File

Expands this file to a file with a more precise type.

During expansion, record types may get new fields, never lose them.

This file object may or may not be mutable. If this file is immutable and is expanded, returns the new file. If this file is mutable, returns this file regardless of whether expansion occurred; the caller cannot discern whether expansion occurred.

discoverField

public File discoverField(TypeSystem typeSystem,
 String fieldName)

Description copied from interface: TypedValue

Tries to expand the type to include the given field name.

Returns this value or an expanded value.