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/*******************************************************************************
* 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.Simple"; //$NON-NLS-1$
}
}
/**
* 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"; //$NON-NLS-1$
}
}
}
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