| /******************************************************************************* |
| * Copyright (c) 2008 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0, which accompanies this distribution |
| * and is available at http://www.eclipse.org/legal/epl-v10.html. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.db; |
| |
| /** |
| * This interface allows clients of the Dali db package to plug in a custom |
| * strategy for comparing an identifier to the names of a collection of |
| * database objects. |
| * |
| * Provisional API: This interface is part of an interim API that is still |
| * under development and expected to change significantly before reaching |
| * stability. It is available at this early stage to solicit feedback from |
| * pioneering adopters on the understanding that any code that uses this API |
| * will almost certainly be broken (repeatedly) as the API evolves. |
| * |
| * This interface is not intended to be implemented by clients. |
| */ |
| public interface DatabaseFinder { |
| |
| /** |
| * Select and return from the specified list of database objects the |
| * database object identified by the specified identifier. |
| */ |
| <T extends DatabaseObject> T selectDatabaseObjectForIdentifier(T[] databaseObjects, String identifier, DefaultCallback defaultCallback); |
| |
| /** |
| * The platform-provided finder is passed a "default" callback that can be |
| * used if appropriate. |
| */ |
| interface DefaultCallback { |
| |
| /** |
| * Select and return from the specified list of database objects the |
| * database object identified by the specified identifier. |
| */ |
| <T extends DatabaseObject> T selectDatabaseObjectForIdentifier(T[] databaseObjects, String identifier); |
| |
| } |
| |
| /** |
| * This finder searches for an exact match. |
| */ |
| final class Simple implements DatabaseFinder { |
| public static final DatabaseFinder INSTANCE = new Simple(); |
| public static DatabaseFinder instance() { |
| return INSTANCE; |
| } |
| // ensure single instance |
| private Simple() { |
| super(); |
| } |
| // search for an exact match on the name |
| public <T extends DatabaseObject> T selectDatabaseObjectForIdentifier(T[] databaseObjects, String identifier, DefaultCallback defaultCallback) { |
| for (T databaseObject : databaseObjects) { |
| if (databaseObject.getName().equals(identifier)) { |
| return databaseObject; |
| } |
| } |
| return null; |
| } |
| @Override |
| public String toString() { |
| return "DatabaseFinder.Default"; //$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * This finder uses the passed in callback to search the list of database objects. |
| */ |
| final class Default implements DatabaseFinder { |
| public static final DatabaseFinder INSTANCE = new Default(); |
| public static DatabaseFinder instance() { |
| return INSTANCE; |
| } |
| // ensure single instance |
| private Default() { |
| super(); |
| } |
| // simply use the callback |
| public <T extends DatabaseObject> T selectDatabaseObjectForIdentifier(T[] databaseObjects, String identifier, DefaultCallback defaultCallback) { |
| return defaultCallback.selectDatabaseObjectForIdentifier(databaseObjects, identifier); |
| } |
| @Override |
| public String toString() { |
| return "DatabaseFinder.Default"; //$NON-NLS-1$ |
| } |
| } |
| |
| } |