PhabricatorCustomField.php
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Created: Thu, May 9, 10:36

PhabricatorCustomField.php
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	<?php

	/**
	* @task apps Building Applications with Custom Fields
	* @task core Core Properties and Field Identity
	* @task proxy Field Proxies
	* @task context Contextual Data
	* @task render Rendering Utilities
	* @task storage Field Storage
	* @task edit Integration with Edit Views
	* @task view Integration with Property Views
	* @task list Integration with List views
	* @task appsearch Integration with ApplicationSearch
	* @task appxaction Integration with ApplicationTransactions
	* @task xactionmail Integration with Transaction Mail
	* @task globalsearch Integration with Global Search
	* @task herald Integration with Herald
	*/
	abstract class PhabricatorCustomField extends Phobject {

	private $viewer;
	private $object;
	private $proxy;

	const ROLE_APPLICATIONTRANSACTIONS = 'ApplicationTransactions';
	const ROLE_TRANSACTIONMAIL = 'ApplicationTransactions.mail';
	const ROLE_APPLICATIONSEARCH = 'ApplicationSearch';
	const ROLE_STORAGE = 'storage';
	const ROLE_DEFAULT = 'default';
	const ROLE_EDIT = 'edit';
	const ROLE_VIEW = 'view';
	const ROLE_LIST = 'list';
	const ROLE_GLOBALSEARCH = 'GlobalSearch';
	const ROLE_CONDUIT = 'conduit';
	const ROLE_HERALD = 'herald';
	const ROLE_EDITENGINE = 'EditEngine';


	/* -( Building Applications with Custom Fields )--------------------------- */


	/**
	* @task apps
	*/
	public static function getObjectFields(
	PhabricatorCustomFieldInterface $object,
	$role) {

	try {
	$attachment = $object->getCustomFields();
	} catch (PhabricatorDataNotAttachedException $ex) {
	$attachment = new PhabricatorCustomFieldAttachment();
	$object->attachCustomFields($attachment);
	}

	try {
	$field_list = $attachment->getCustomFieldList($role);
	} catch (PhabricatorCustomFieldNotAttachedException $ex) {
	$base_class = $object->getCustomFieldBaseClass();

	$spec = $object->getCustomFieldSpecificationForRole($role);
	if (!is_array($spec)) {
	throw new Exception(
	pht(
	"Expected an array from %s for object of class '%s'.",
	'getCustomFieldSpecificationForRole()',
	get_class($object)));
	}

	$fields = self::buildFieldList(
	$base_class,
	$spec,
	$object);

	foreach ($fields as $key => $field) {
	if (!$field->shouldEnableForRole($role)) {
	unset($fields[$key]);
	}
	}

	foreach ($fields as $field) {
	$field->setObject($object);
	}

	$field_list = new PhabricatorCustomFieldList($fields);
	$attachment->addCustomFieldList($role, $field_list);
	}

	return $field_list;
	}


	/**
	* @task apps
	*/
	public static function getObjectField(
	PhabricatorCustomFieldInterface $object,
	$role,
	$field_key) {

	$fields = self::getObjectFields($object, $role)->getFields();

	return idx($fields, $field_key);
	}


	/**
	* @task apps
	*/
	public static function buildFieldList(
	$base_class,
	array $spec,
	$object,
	array $options = array()) {

	$field_objects = id(new PhutilClassMapQuery())
	->setAncestorClass($base_class)
	->execute();

	$fields = array();
	foreach ($field_objects as $field_object) {
	$field_object = clone $field_object;
	foreach ($field_object->createFields($object) as $field) {
	$key = $field->getFieldKey();
	if (isset($fields[$key])) {
	throw new Exception(
	pht(
	"Both '%s' and '%s' define a custom field with ".
	"field key '%s'. Field keys must be unique.",
	get_class($fields[$key]),
	get_class($field),
	$key));
	}
	$fields[$key] = $field;
	}
	}

	foreach ($fields as $key => $field) {
	if (!$field->isFieldEnabled()) {
	unset($fields[$key]);
	}
	}

	$fields = array_select_keys($fields, array_keys($spec)) + $fields;

	if (empty($options['withDisabled'])) {
	foreach ($fields as $key => $field) {
	if (isset($spec[$key]['disabled'])) {
	$is_disabled = $spec[$key]['disabled'];
	} else {
	$is_disabled = $field->shouldDisableByDefault();
	}

	if ($is_disabled) {
	if ($field->canDisableField()) {
	unset($fields[$key]);
	}
	}
	}
	}

	return $fields;
	}


	/* -( Core Properties and Field Identity )--------------------------------- */


	/**
	* Return a key which uniquely identifies this field, like
	* "mycompany:dinosaur:count". Normally you should provide some level of
	* namespacing to prevent collisions.
	*
	* @return string String which uniquely identifies this field.
	* @task core
	*/
	public function getFieldKey() {
	if ($this->proxy) {
	return $this->proxy->getFieldKey();
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException(
	$this,
	$field_key_is_incomplete = true);
	}

	public function getModernFieldKey() {
	if ($this->proxy) {
	return $this->proxy->getModernFieldKey();
	}
	return $this->getFieldKey();
	}


	/**
	* Return a human-readable field name.
	*
	* @return string Human readable field name.
	* @task core
	*/
	public function getFieldName() {
	if ($this->proxy) {
	return $this->proxy->getFieldName();
	}
	return $this->getModernFieldKey();
	}


	/**
	* Return a short, human-readable description of the field's behavior. This
	* provides more context to administrators when they are customizing fields.
	*
	* @return string\|null Optional human-readable description.
	* @task core
	*/
	public function getFieldDescription() {
	if ($this->proxy) {
	return $this->proxy->getFieldDescription();
	}
	return null;
	}


	/**
	* Most field implementations are unique, in that one class corresponds to
	* one field. However, some field implementations are general and a single
	* implementation may drive several fields.
	*
	* For general implementations, the general field implementation can return
	* multiple field instances here.
	*
	* @param object The object to create fields for.
	* @return list<PhabricatorCustomField> List of fields.
	* @task core
	*/
	public function createFields($object) {
	return array($this);
	}


	/**
	* You can return `false` here if the field should not be enabled for any
	* role. For example, it might depend on something (like an application or
	* library) which isn't installed, or might have some global configuration
	* which allows it to be disabled.
	*
	* @return bool False to completely disable this field for all roles.
	* @task core
	*/
	public function isFieldEnabled() {
	if ($this->proxy) {
	return $this->proxy->isFieldEnabled();
	}
	return true;
	}


	/**
	* Low level selector for field availability. Fields can appear in different
	* roles (like an edit view, a list view, etc.), but not every field needs
	* to appear everywhere. Fields that are disabled in a role won't appear in
	* that context within applications.
	*
	* Normally, you do not need to override this method. Instead, override the
	* methods specific to roles you want to enable. For example, implement
	* @{method:shouldUseStorage()} to activate the `'storage'` role.
	*
	* @return bool True to enable the field for the given role.
	* @task core
	*/
	public function shouldEnableForRole($role) {

	// NOTE: All of these calls proxy individually, so we don't need to
	// proxy this call as a whole.

	switch ($role) {
	case self::ROLE_APPLICATIONTRANSACTIONS:
	return $this->shouldAppearInApplicationTransactions();
	case self::ROLE_APPLICATIONSEARCH:
	return $this->shouldAppearInApplicationSearch();
	case self::ROLE_STORAGE:
	return $this->shouldUseStorage();
	case self::ROLE_EDIT:
	return $this->shouldAppearInEditView();
	case self::ROLE_VIEW:
	return $this->shouldAppearInPropertyView();
	case self::ROLE_LIST:
	return $this->shouldAppearInListView();
	case self::ROLE_GLOBALSEARCH:
	return $this->shouldAppearInGlobalSearch();
	case self::ROLE_CONDUIT:
	return $this->shouldAppearInConduitDictionary();
	case self::ROLE_TRANSACTIONMAIL:
	return $this->shouldAppearInTransactionMail();
	case self::ROLE_HERALD:
	return $this->shouldAppearInHerald();
	case self::ROLE_EDITENGINE:
	return $this->shouldAppearInEditView() \|\|
	$this->shouldAppearInEditEngine();
	case self::ROLE_DEFAULT:
	return true;
	default:
	throw new Exception(pht("Unknown field role '%s'!", $role));
	}
	}


	/**
	* Allow administrators to disable this field. Most fields should allow this,
	* but some are fundamental to the behavior of the application and can be
	* locked down to avoid chaos, disorder, and the decline of civilization.
	*
	* @return bool False to prevent this field from being disabled through
	* configuration.
	* @task core
	*/
	public function canDisableField() {
	return true;
	}

	public function shouldDisableByDefault() {
	return false;
	}


	/**
	* Return an index string which uniquely identifies this field.
	*
	* @return string Index string which uniquely identifies this field.
	* @task core
	*/
	final public function getFieldIndex() {
	return PhabricatorHash::digestForIndex($this->getFieldKey());
	}


	/* -( Field Proxies )------------------------------------------------------ */


	/**
	* Proxies allow a field to use some other field's implementation for most
	* of their behavior while still subclassing an application field. When a
	* proxy is set for a field with @{method:setProxy}, all of its methods will
	* call through to the proxy by default.
	*
	* This is most commonly used to implement configuration-driven custom fields
	* using @{class:PhabricatorStandardCustomField}.
	*
	* This method must be overridden to return `true` before a field can accept
	* proxies.
	*
	* @return bool True if you can @{method:setProxy} this field.
	* @task proxy
	*/
	public function canSetProxy() {
	if ($this instanceof PhabricatorStandardCustomFieldInterface) {
	return true;
	}
	return false;
	}


	/**
	* Set the proxy implementation for this field. See @{method:canSetProxy} for
	* discussion of field proxies.
	*
	* @param PhabricatorCustomField Field implementation.
	* @return this
	*/
	final public function setProxy(PhabricatorCustomField $proxy) {
	if (!$this->canSetProxy()) {
	throw new PhabricatorCustomFieldNotProxyException($this);
	}

	$this->proxy = $proxy;
	return $this;
	}


	/**
	* Get the field's proxy implementation, if any. For discussion, see
	* @{method:canSetProxy}.
	*
	* @return PhabricatorCustomField\|null Proxy field, if one is set.
	*/
	final public function getProxy() {
	return $this->proxy;
	}


	/* -( Contextual Data )---------------------------------------------------- */


	/**
	* Sets the object this field belongs to.
	*
	* @param PhabricatorCustomFieldInterface The object this field belongs to.
	* @return this
	* @task context
	*/
	final public function setObject(PhabricatorCustomFieldInterface $object) {
	if ($this->proxy) {
	$this->proxy->setObject($object);
	return $this;
	}

	$this->object = $object;
	$this->didSetObject($object);
	return $this;
	}


	/**
	* Read object data into local field storage, if applicable.
	*
	* @param PhabricatorCustomFieldInterface The object this field belongs to.
	* @return this
	* @task context
	*/
	public function readValueFromObject(PhabricatorCustomFieldInterface $object) {
	if ($this->proxy) {
	$this->proxy->readValueFromObject($object);
	}
	return $this;
	}


	/**
	* Get the object this field belongs to.
	*
	* @return PhabricatorCustomFieldInterface The object this field belongs to.
	* @task context
	*/
	final public function getObject() {
	if ($this->proxy) {
	return $this->proxy->getObject();
	}

	return $this->object;
	}


	/**
	* This is a hook, primarily for subclasses to load object data.
	*
	* @return PhabricatorCustomFieldInterface The object this field belongs to.
	* @return void
	*/
	protected function didSetObject(PhabricatorCustomFieldInterface $object) {
	return;
	}


	/**
	* @task context
	*/
	final public function setViewer(PhabricatorUser $viewer) {
	if ($this->proxy) {
	$this->proxy->setViewer($viewer);
	return $this;
	}

	$this->viewer = $viewer;
	return $this;
	}


	/**
	* @task context
	*/
	final public function getViewer() {
	if ($this->proxy) {
	return $this->proxy->getViewer();
	}

	return $this->viewer;
	}


	/**
	* @task context
	*/
	final protected function requireViewer() {
	if ($this->proxy) {
	return $this->proxy->requireViewer();
	}

	if (!$this->viewer) {
	throw new PhabricatorCustomFieldDataNotAvailableException($this);
	}
	return $this->viewer;
	}


	/* -( Rendering Utilities )------------------------------------------------ */


	/**
	* @task render
	*/
	protected function renderHandleList(array $handles) {
	if (!$handles) {
	return null;
	}

	$out = array();
	foreach ($handles as $handle) {
	$out[] = $handle->renderHovercardLink();
	}

	return phutil_implode_html(phutil_tag('br'), $out);
	}


	/* -( Storage )------------------------------------------------------------ */


	/**
	* Return true to use field storage.
	*
	* Fields which can be edited by the user will most commonly use storage,
	* while some other types of fields (for instance, those which just display
	* information in some stylized way) may not. Many builtin fields do not use
	* storage because their data is available on the object itself.
	*
	* If you implement this, you must also implement @{method:getValueForStorage}
	* and @{method:setValueFromStorage}.
	*
	* @return bool True to use storage.
	* @task storage
	*/
	public function shouldUseStorage() {
	if ($this->proxy) {
	return $this->proxy->shouldUseStorage();
	}
	return false;
	}


	/**
	* Return a new, empty storage object. This should be a subclass of
	* @{class:PhabricatorCustomFieldStorage} which is bound to the application's
	* database.
	*
	* @return PhabricatorCustomFieldStorage New empty storage object.
	* @task storage
	*/
	public function newStorageObject() {
	// NOTE: This intentionally isn't proxied, to avoid call cycles.
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Return a serialized representation of the field value, appropriate for
	* storing in auxiliary field storage. You must implement this method if
	* you implement @{method:shouldUseStorage}.
	*
	* If the field value is a scalar, it can be returned unmodiifed. If not,
	* it should be serialized (for example, using JSON).
	*
	* @return string Serialized field value.
	* @task storage
	*/
	public function getValueForStorage() {
	if ($this->proxy) {
	return $this->proxy->getValueForStorage();
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Set the field's value given a serialized storage value. This is called
	* when the field is loaded; if no data is available, the value will be
	* null. You must implement this method if you implement
	* @{method:shouldUseStorage}.
	*
	* Usually, the value can be loaded directly. If it isn't a scalar, you'll
	* need to undo whatever serialization you applied in
	* @{method:getValueForStorage}.
	*
	* @param string\|null Serialized field representation (from
	* @{method:getValueForStorage}) or null if no value has
	* ever been stored.
	* @return this
	* @task storage
	*/
	public function setValueFromStorage($value) {
	if ($this->proxy) {
	return $this->proxy->setValueFromStorage($value);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}

	public function didSetValueFromStorage() {
	if ($this->proxy) {
	return $this->proxy->didSetValueFromStorage();
	}
	return $this;
	}


	/* -( ApplicationSearch )-------------------------------------------------- */


	/**
	* Appearing in ApplicationSearch allows a field to be indexed and searched
	* for.
	*
	* @return bool True to appear in ApplicationSearch.
	* @task appsearch
	*/
	public function shouldAppearInApplicationSearch() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInApplicationSearch();
	}
	return false;
	}


	/**
	* Return one or more indexes which this field can meaningfully query against
	* to implement ApplicationSearch.
	*
	* Normally, you should build these using @{method:newStringIndex} and
	* @{method:newNumericIndex}. For example, if a field holds a numeric value
	* it might return a single numeric index:
	*
	* return array($this->newNumericIndex($this->getValue()));
	*
	* If a field holds a more complex value (like a list of users), it might
	* return several string indexes:
	*
	* $indexes = array();
	* foreach ($this->getValue() as $phid) {
	* $indexes[] = $this->newStringIndex($phid);
	* }
	* return $indexes;
	*
	* @return list<PhabricatorCustomFieldIndexStorage> List of indexes.
	* @task appsearch
	*/
	public function buildFieldIndexes() {
	if ($this->proxy) {
	return $this->proxy->buildFieldIndexes();
	}
	return array();
	}


	/**
	* Return an index against which this field can be meaningfully ordered
	* against to implement ApplicationSearch.
	*
	* This should be a single index, normally built using
	* @{method:newStringIndex} and @{method:newNumericIndex}.
	*
	* The value of the index is not used.
	*
	* Return null from this method if the field can not be ordered.
	*
	* @return PhabricatorCustomFieldIndexStorage A single index to order by.
	* @task appsearch
	*/
	public function buildOrderIndex() {
	if ($this->proxy) {
	return $this->proxy->buildOrderIndex();
	}
	return null;
	}


	/**
	* Build a new empty storage object for storing string indexes. Normally,
	* this should be a concrete subclass of
	* @{class:PhabricatorCustomFieldStringIndexStorage}.
	*
	* @return PhabricatorCustomFieldStringIndexStorage Storage object.
	* @task appsearch
	*/
	protected function newStringIndexStorage() {
	// NOTE: This intentionally isn't proxied, to avoid call cycles.
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Build a new empty storage object for storing string indexes. Normally,
	* this should be a concrete subclass of
	* @{class:PhabricatorCustomFieldStringIndexStorage}.
	*
	* @return PhabricatorCustomFieldStringIndexStorage Storage object.
	* @task appsearch
	*/
	protected function newNumericIndexStorage() {
	// NOTE: This intentionally isn't proxied, to avoid call cycles.
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Build and populate storage for a string index.
	*
	* @param string String to index.
	* @return PhabricatorCustomFieldStringIndexStorage Populated storage.
	* @task appsearch
	*/
	protected function newStringIndex($value) {
	if ($this->proxy) {
	return $this->proxy->newStringIndex();
	}

	$key = $this->getFieldIndex();
	return $this->newStringIndexStorage()
	->setIndexKey($key)
	->setIndexValue($value);
	}


	/**
	* Build and populate storage for a numeric index.
	*
	* @param string Numeric value to index.
	* @return PhabricatorCustomFieldNumericIndexStorage Populated storage.
	* @task appsearch
	*/
	protected function newNumericIndex($value) {
	if ($this->proxy) {
	return $this->proxy->newNumericIndex();
	}
	$key = $this->getFieldIndex();
	return $this->newNumericIndexStorage()
	->setIndexKey($key)
	->setIndexValue($value);
	}


	/**
	* Read a query value from a request, for storage in a saved query. Normally,
	* this method should, e.g., read a string out of the request.
	*
	* @param PhabricatorApplicationSearchEngine Engine building the query.
	* @param AphrontRequest Request to read from.
	* @return wild
	* @task appsearch
	*/
	public function readApplicationSearchValueFromRequest(
	PhabricatorApplicationSearchEngine $engine,
	AphrontRequest $request) {
	if ($this->proxy) {
	return $this->proxy->readApplicationSearchValueFromRequest(
	$engine,
	$request);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Constrain a query, given a field value. Generally, this method should
	* use `with...()` methods to apply filters or other constraints to the
	* query.
	*
	* @param PhabricatorApplicationSearchEngine Engine executing the query.
	* @param PhabricatorCursorPagedPolicyAwareQuery Query to constrain.
	* @param wild Constraint provided by the user.
	* @return void
	* @task appsearch
	*/
	public function applyApplicationSearchConstraintToQuery(
	PhabricatorApplicationSearchEngine $engine,
	PhabricatorCursorPagedPolicyAwareQuery $query,
	$value) {
	if ($this->proxy) {
	return $this->proxy->applyApplicationSearchConstraintToQuery(
	$engine,
	$query,
	$value);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Append search controls to the interface.
	*
	* @param PhabricatorApplicationSearchEngine Engine constructing the form.
	* @param AphrontFormView The form to update.
	* @param wild Value from the saved query.
	* @return void
	* @task appsearch
	*/
	public function appendToApplicationSearchForm(
	PhabricatorApplicationSearchEngine $engine,
	AphrontFormView $form,
	$value) {
	if ($this->proxy) {
	return $this->proxy->appendToApplicationSearchForm(
	$engine,
	$form,
	$value);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/* -( ApplicationTransactions )-------------------------------------------- */


	/**
	* Appearing in ApplicationTrasactions allows a field to be edited using
	* standard workflows.
	*
	* @return bool True to appear in ApplicationTransactions.
	* @task appxaction
	*/
	public function shouldAppearInApplicationTransactions() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInApplicationTransactions();
	}
	return false;
	}


	/**
	* @task appxaction
	*/
	public function getApplicationTransactionType() {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionType();
	}
	return PhabricatorTransactions::TYPE_CUSTOMFIELD;
	}


	/**
	* @task appxaction
	*/
	public function getApplicationTransactionMetadata() {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionMetadata();
	}
	return array();
	}


	/**
	* @task appxaction
	*/
	public function getOldValueForApplicationTransactions() {
	if ($this->proxy) {
	return $this->proxy->getOldValueForApplicationTransactions();
	}
	return $this->getValueForStorage();
	}


	/**
	* @task appxaction
	*/
	public function getNewValueForApplicationTransactions() {
	if ($this->proxy) {
	return $this->proxy->getNewValueForApplicationTransactions();
	}
	return $this->getValueForStorage();
	}


	/**
	* @task appxaction
	*/
	public function setValueFromApplicationTransactions($value) {
	if ($this->proxy) {
	return $this->proxy->setValueFromApplicationTransactions($value);
	}
	return $this->setValueFromStorage($value);
	}


	/**
	* @task appxaction
	*/
	public function getNewValueFromApplicationTransactions(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getNewValueFromApplicationTransactions($xaction);
	}
	return $xaction->getNewValue();
	}


	/**
	* @task appxaction
	*/
	public function getApplicationTransactionHasEffect(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionHasEffect($xaction);
	}
	return ($xaction->getOldValue() !== $xaction->getNewValue());
	}


	/**
	* @task appxaction
	*/
	public function applyApplicationTransactionInternalEffects(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->applyApplicationTransactionInternalEffects($xaction);
	}
	return;
	}


	/**
	* @task appxaction
	*/
	public function getApplicationTransactionRemarkupBlocks(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionRemarkupBlocks($xaction);
	}
	return array();
	}


	/**
	* @task appxaction
	*/
	public function applyApplicationTransactionExternalEffects(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->applyApplicationTransactionExternalEffects($xaction);
	}

	if (!$this->shouldEnableForRole(self::ROLE_STORAGE)) {
	return;
	}

	$this->setValueFromApplicationTransactions($xaction->getNewValue());
	$value = $this->getValueForStorage();

	$table = $this->newStorageObject();
	$conn_w = $table->establishConnection('w');

	if ($value === null) {
	queryfx(
	$conn_w,
	'DELETE FROM %T WHERE objectPHID = %s AND fieldIndex = %s',
	$table->getTableName(),
	$this->getObject()->getPHID(),
	$this->getFieldIndex());
	} else {
	queryfx(
	$conn_w,
	'INSERT INTO %T (objectPHID, fieldIndex, fieldValue)
	VALUES (%s, %s, %s)
	ON DUPLICATE KEY UPDATE fieldValue = VALUES(fieldValue)',
	$table->getTableName(),
	$this->getObject()->getPHID(),
	$this->getFieldIndex(),
	$value);
	}

	return;
	}


	/**
	* Validate transactions for an object. This allows you to raise an error
	* when a transaction would set a field to an invalid value, or when a field
	* is required but no transactions provide value.
	*
	* @param PhabricatorLiskDAO Editor applying the transactions.
	* @param string Transaction type. This type is always
	* `PhabricatorTransactions::TYPE_CUSTOMFIELD`, it is provided for
	* convenience when constructing exceptions.
	* @param list<PhabricatorApplicationTransaction> Transactions being applied,
	* which may be empty if this field is not being edited.
	* @return list<PhabricatorApplicationTransactionValidationError> Validation
	* errors.
	*
	* @task appxaction
	*/
	public function validateApplicationTransactions(
	PhabricatorApplicationTransactionEditor $editor,
	$type,
	array $xactions) {
	if ($this->proxy) {
	return $this->proxy->validateApplicationTransactions(
	$editor,
	$type,
	$xactions);
	}
	return array();
	}

	public function getApplicationTransactionTitle(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionTitle(
	$xaction);
	}

	$author_phid = $xaction->getAuthorPHID();
	return pht(
	'%s updated this object.',
	$xaction->renderHandleLink($author_phid));
	}

	public function getApplicationTransactionTitleForFeed(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionTitleForFeed(
	$xaction);
	}

	$author_phid = $xaction->getAuthorPHID();
	$object_phid = $xaction->getObjectPHID();
	return pht(
	'%s updated %s.',
	$xaction->renderHandleLink($author_phid),
	$xaction->renderHandleLink($object_phid));
	}


	public function getApplicationTransactionHasChangeDetails(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionHasChangeDetails(
	$xaction);
	}
	return false;
	}

	public function getApplicationTransactionChangeDetails(
	PhabricatorApplicationTransaction $xaction,
	PhabricatorUser $viewer) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionChangeDetails(
	$xaction,
	$viewer);
	}
	return null;
	}

	public function getApplicationTransactionRequiredHandlePHIDs(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->getApplicationTransactionRequiredHandlePHIDs(
	$xaction);
	}
	return array();
	}

	public function shouldHideInApplicationTransactions(
	PhabricatorApplicationTransaction $xaction) {
	if ($this->proxy) {
	return $this->proxy->shouldHideInApplicationTransactions($xaction);
	}
	return false;
	}


	/* -( Transaction Mail )--------------------------------------------------- */


	/**
	* @task xactionmail
	*/
	public function shouldAppearInTransactionMail() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInTransactionMail();
	}
	return false;
	}


	/**
	* @task xactionmail
	*/
	public function updateTransactionMailBody(
	PhabricatorMetaMTAMailBody $body,
	PhabricatorApplicationTransactionEditor $editor,
	array $xactions) {
	if ($this->proxy) {
	return $this->proxy->updateTransactionMailBody($body, $editor, $xactions);
	}
	return;
	}


	/* -( Edit View )---------------------------------------------------------- */


	public function getEditEngineFields(PhabricatorEditEngine $engine) {
	$field = $this->newStandardEditField($engine);

	return array(
	$field,
	);
	}

	protected function newEditField() {
	$field = id(new PhabricatorCustomFieldEditField())
	->setCustomField($this);

	$http_type = $this->getHTTPParameterType();
	if ($http_type) {
	$field->setCustomFieldHTTPParameterType($http_type);
	}

	$conduit_type = $this->getConduitEditParameterType();
	if ($conduit_type) {
	$field->setCustomFieldConduitParameterType($conduit_type);
	}

	return $field;
	}

	protected function newStandardEditField() {
	if ($this->proxy) {
	return $this->proxy->newStandardEditField();
	}

	if (!$this->shouldAppearInEditView()) {
	$conduit_only = true;
	} else {
	$conduit_only = false;
	}

	return $this->newEditField()
	->setKey($this->getFieldKey())
	->setEditTypeKey($this->getModernFieldKey())
	->setLabel($this->getFieldName())
	->setDescription($this->getFieldDescription())
	->setTransactionType($this->getApplicationTransactionType())
	->setIsConduitOnly($conduit_only)
	->setValue($this->getNewValueForApplicationTransactions());
	}

	protected function getHTTPParameterType() {
	if ($this->proxy) {
	return $this->proxy->getHTTPParameterType();
	}
	return null;
	}

	/**
	* @task edit
	*/
	public function shouldAppearInEditView() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInEditView();
	}
	return false;
	}

	/**
	* @task edit
	*/
	public function shouldAppearInEditEngine() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInEditEngine();
	}
	return false;
	}


	/**
	* @task edit
	*/
	public function readValueFromRequest(AphrontRequest $request) {
	if ($this->proxy) {
	return $this->proxy->readValueFromRequest($request);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* @task edit
	*/
	public function getRequiredHandlePHIDsForEdit() {
	if ($this->proxy) {
	return $this->proxy->getRequiredHandlePHIDsForEdit();
	}
	return array();
	}


	/**
	* @task edit
	*/
	public function getInstructionsForEdit() {
	if ($this->proxy) {
	return $this->proxy->getInstructionsForEdit();
	}
	return null;
	}


	/**
	* @task edit
	*/
	public function renderEditControl(array $handles) {
	if ($this->proxy) {
	return $this->proxy->renderEditControl($handles);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/* -( Property View )------------------------------------------------------ */


	/**
	* @task view
	*/
	public function shouldAppearInPropertyView() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInPropertyView();
	}
	return false;
	}


	/**
	* @task view
	*/
	public function renderPropertyViewLabel() {
	if ($this->proxy) {
	return $this->proxy->renderPropertyViewLabel();
	}
	return $this->getFieldName();
	}


	/**
	* @task view
	*/
	public function renderPropertyViewValue(array $handles) {
	if ($this->proxy) {
	return $this->proxy->renderPropertyViewValue($handles);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* @task view
	*/
	public function getStyleForPropertyView() {
	if ($this->proxy) {
	return $this->proxy->getStyleForPropertyView();
	}
	return 'property';
	}


	/**
	* @task view
	*/
	public function getIconForPropertyView() {
	if ($this->proxy) {
	return $this->proxy->getIconForPropertyView();
	}
	return null;
	}


	/**
	* @task view
	*/
	public function getRequiredHandlePHIDsForPropertyView() {
	if ($this->proxy) {
	return $this->proxy->getRequiredHandlePHIDsForPropertyView();
	}
	return array();
	}


	/* -( List View )---------------------------------------------------------- */


	/**
	* @task list
	*/
	public function shouldAppearInListView() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInListView();
	}
	return false;
	}


	/**
	* @task list
	*/
	public function renderOnListItem(PHUIObjectItemView $view) {
	if ($this->proxy) {
	return $this->proxy->renderOnListItem($view);
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/* -( Global Search )------------------------------------------------------ */


	/**
	* @task globalsearch
	*/
	public function shouldAppearInGlobalSearch() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInGlobalSearch();
	}
	return false;
	}


	/**
	* @task globalsearch
	*/
	public function updateAbstractDocument(
	PhabricatorSearchAbstractDocument $document) {
	if ($this->proxy) {
	return $this->proxy->updateAbstractDocument($document);
	}
	return $document;
	}


	/* -( Conduit )------------------------------------------------------------ */


	/**
	* @task conduit
	*/
	public function shouldAppearInConduitDictionary() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInConduitDictionary();
	}
	return false;
	}


	/**
	* @task conduit
	*/
	public function getConduitDictionaryValue() {
	if ($this->proxy) {
	return $this->proxy->getConduitDictionaryValue();
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	public function shouldAppearInConduitTransactions() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInConduitDictionary();
	}
	return false;
	}

	public function getConduitSearchParameterType() {
	return $this->newConduitSearchParameterType();
	}

	protected function newConduitSearchParameterType() {
	if ($this->proxy) {
	return $this->proxy->newConduitSearchParameterType();
	}
	return null;
	}

	public function getConduitEditParameterType() {
	return $this->newConduitEditParameterType();
	}

	protected function newConduitEditParameterType() {
	if ($this->proxy) {
	return $this->proxy->newConduitEditParameterType();
	}
	return null;
	}


	/* -( Herald )------------------------------------------------------------- */


	/**
	* Return `true` to make this field available in Herald.
	*
	* @return bool True to expose the field in Herald.
	* @task herald
	*/
	public function shouldAppearInHerald() {
	if ($this->proxy) {
	return $this->proxy->shouldAppearInHerald();
	}
	return false;
	}


	/**
	* Get the name of the field in Herald. By default, this uses the
	* normal field name.
	*
	* @return string Herald field name.
	* @task herald
	*/
	public function getHeraldFieldName() {
	if ($this->proxy) {
	return $this->proxy->getHeraldFieldName();
	}
	return $this->getFieldName();
	}


	/**
	* Get the field value for evaluation by Herald.
	*
	* @return wild Field value.
	* @task herald
	*/
	public function getHeraldFieldValue() {
	if ($this->proxy) {
	return $this->proxy->getHeraldFieldValue();
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Get the available conditions for this field in Herald.
	*
	* @return list<const> List of Herald condition constants.
	* @task herald
	*/
	public function getHeraldFieldConditions() {
	if ($this->proxy) {
	return $this->proxy->getHeraldFieldConditions();
	}
	throw new PhabricatorCustomFieldImplementationIncompleteException($this);
	}


	/**
	* Get the Herald value type for the given condition.
	*
	* @param const Herald condition constant.
	* @return const\|null Herald value type, or null to use the default.
	* @task herald
	*/
	public function getHeraldFieldValueType($condition) {
	if ($this->proxy) {
	return $this->proxy->getHeraldFieldValueType($condition);
	}
	return null;
	}

	public function getHeraldFieldStandardType() {
	if ($this->proxy) {
	return $this->proxy->getHeraldFieldStandardType();
	}
	return null;
	}

	public function getHeraldDatasource() {
	if ($this->proxy) {
	return $this->proxy->getHeraldDatasource();
	}
	return null;
	}


	}

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