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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.internal.db.ddl.delta;
import org.eclipse.net4j.db.ddl.IDBSchemaElement;
import org.eclipse.net4j.db.ddl.delta.IDBDelta;
import org.eclipse.net4j.db.ddl.delta.IDBPropertyDelta;
import org.eclipse.net4j.internal.db.DBElement;
import org.eclipse.net4j.util.CheckUtil;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* @author Eike Stepper
*/
public abstract class DBDelta extends DBElement implements IDBDelta
{
private static final long serialVersionUID = 1L;
private IDBDelta parent;
private String name;
private ChangeKind changeKind;
private Map<String, IDBPropertyDelta<?>> propertyDeltas = new HashMap<String, IDBPropertyDelta<?>>();
public DBDelta(IDBDelta parent, String name, ChangeKind changeKind)
{
CheckUtil.checkArg(name, "name");
this.parent = parent;
this.name = name;
this.changeKind = changeKind;
}
/**
* Constructor for deserialization.
*/
protected DBDelta()
{
}
public IDBDelta getParent()
{
return parent;
}
public final String getName()
{
return name;
}
public final ChangeKind getChangeKind()
{
return changeKind;
}
public <T> IDBPropertyDelta<T> getPropertyDelta(String name)
{
@SuppressWarnings("unchecked")
IDBPropertyDelta<T> propertyDelta = (IDBPropertyDelta<T>)propertyDeltas.get(name);
return propertyDelta;
}
public <T> T getPropertyValue(String name)
{
return getPropertyValue(name, false);
}
public <T> T getPropertyValue(String name, boolean old)
{
IDBPropertyDelta<T> propertyDelta = getPropertyDelta(name);
if (old)
{
return propertyDelta.getOldValue();
}
return propertyDelta.getValue();
}
public final Map<String, IDBPropertyDelta<?>> getPropertyDeltas()
{
return Collections.unmodifiableMap(propertyDeltas);
}
public final void addPropertyDelta(IDBPropertyDelta<?> propertyDelta)
{
propertyDeltas.put(propertyDelta.getName(), propertyDelta);
}
public static String getName(IDBSchemaElement element, IDBSchemaElement oldElement)
{
return oldElement == null ? element.getName() : oldElement.getName();
}
public static ChangeKind getChangeKind(Object object, Object oldObject)
{
return object == null ? ChangeKind.REMOVED : oldObject == null ? ChangeKind.ADDED : ChangeKind.CHANGED;
}
protected static <T extends IDBSchemaElement> void compare(T[] elements, T[] oldElements,
SchemaElementComparator<T> comparator)
{
for (int i = 0; i < elements.length; i++)
{
T element = elements[i];
String name = element.getName();
T oldElement = findElement(oldElements, name);
comparator.compare(element, oldElement);
}
for (int i = 0; i < oldElements.length; i++)
{
T oldElement = oldElements[i];
String name = oldElement.getName();
if (findElement(elements, name) == null)
{
comparator.compare(null, oldElement);
}
}
}
private static <T extends IDBSchemaElement> T findElement(T[] elements, String name)
{
for (int i = 0; i < elements.length; i++)
{
T element = elements[i];
if (element.getName().equals(name))
{
return element;
}
}
return null;
}
/**
* @author Eike Stepper
*/
public interface SchemaElementComparator<T extends IDBSchemaElement>
{
public void compare(T element, T oldElement);
}
}
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