PhabricatorConfigTableSchema.php
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	<?php

	final class PhabricatorConfigTableSchema
	extends PhabricatorConfigStorageSchema {

	private $collation;
	private $engine;
	private $columns = array();
	private $keys = array();
	private $persistenceType = self::PERSISTENCE_DATA;

	const PERSISTENCE_DATA = 'data';
	const PERSISTENCE_CACHE = 'cache';
	const PERSISTENCE_INDEX = 'index';

	public function addColumn(PhabricatorConfigColumnSchema $column) {
	$key = $column->getName();
	if (isset($this->columns[$key])) {
	throw new Exception(
	pht('Trying to add duplicate column "%s"!', $key));
	}
	$this->columns[$key] = $column;
	return $this;
	}

	public function addKey(PhabricatorConfigKeySchema $key) {
	$name = $key->getName();
	if (isset($this->keys[$name])) {
	throw new Exception(
	pht('Trying to add duplicate key "%s"!', $name));
	}
	$key->setTable($this);
	$this->keys[$name] = $key;
	return $this;
	}

	public function getColumns() {
	return $this->columns;
	}

	public function getColumn($key) {
	return idx($this->getColumns(), $key);
	}

	public function getKeys() {
	return $this->keys;
	}

	public function getKey($key) {
	return idx($this->getKeys(), $key);
	}

	public function setPersistenceType($persistence_type) {
	$this->persistenceType = $persistence_type;
	return $this;
	}

	public function getPersistenceType() {
	return $this->persistenceType;
	}

	public function getPersistenceTypeDisplayName() {
	$map = array(
	self::PERSISTENCE_DATA => pht('Data'),
	self::PERSISTENCE_CACHE => pht('Cache'),
	self::PERSISTENCE_INDEX => pht('Index'),
	);

	$type = $this->getPersistenceType();

	return idx($map, $type, $type);
	}

	protected function getSubschemata() {
	// NOTE: Keys and columns may have the same name, so make sure we return
	// everything.

	return array_merge(
	array_values($this->columns),
	array_values($this->keys));
	}

	public function setCollation($collation) {
	$this->collation = $collation;
	return $this;
	}

	public function getCollation() {
	return $this->collation;
	}

	public function setEngine($engine) {
	$this->engine = $engine;
	return $this;
	}

	public function getEngine() {
	return $this->engine;
	}

	protected function compareToSimilarSchema(
	PhabricatorConfigStorageSchema $expect) {

	$issues = array();
	if ($this->getCollation() != $expect->getCollation()) {
	$issues[] = self::ISSUE_COLLATION;
	}

	if ($this->getEngine() != $expect->getEngine()) {
	$issues[] = self::ISSUE_ENGINE;
	}

	return $issues;
	}

	public function newEmptyClone() {
	$clone = clone $this;
	$clone->columns = array();
	$clone->keys = array();
	return $clone;
	}

	}

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