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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.IDBDeltaVisitor;
import org.eclipse.net4j.db.ddl.delta.IDBDeltaWithPosition;
import org.eclipse.net4j.spi.db.DBNamedElement;
import org.eclipse.net4j.spi.db.DBSchemaElement;
import org.eclipse.net4j.util.StringUtil;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @author Eike Stepper
*/
public abstract class DBDelta extends DBNamedElement implements IDBDelta
{
private static final IDBDelta[] NO_ELEMENTS = {};
private static final long serialVersionUID = 1L;
private DBDelta parent;
private ChangeKind changeKind;
private transient IDBDelta[] elements;
public DBDelta(DBDelta parent, String name, ChangeKind changeKind)
{
super(name);
this.parent = parent;
this.changeKind = changeKind;
}
/**
* Constructor for deserialization.
*/
protected DBDelta()
{
}
public DBDelta getParent()
{
return parent;
}
public final ChangeKind getChangeKind()
{
return changeKind;
}
public final int compareTo(IDBDelta delta2)
{
int result = getDeltaType().compareTo(delta2.getDeltaType());
if (result == 0)
{
if (this instanceof IDBDeltaWithPosition && delta2 instanceof IDBDeltaWithPosition)
{
IDBDeltaWithPosition withPosition1 = (IDBDeltaWithPosition)this;
IDBDeltaWithPosition withPosition2 = (IDBDeltaWithPosition)delta2;
return withPosition1.getPosition() - withPosition2.getPosition();
}
result = getName().compareTo(delta2.getName());
}
return result;
}
public final void accept(IDBDeltaVisitor visitor)
{
doAccept(visitor);
IDBDelta[] deltas = getElements();
for (IDBDelta delta : deltas)
{
delta.accept(visitor);
}
}
protected abstract void doAccept(IDBDeltaVisitor visitor);
public final boolean isEmpty()
{
return getElements().length == 0;
}
public final IDBDelta[] getElements()
{
if (elements == null)
{
List<IDBDelta> deltas = new ArrayList<IDBDelta>();
collectElements(deltas);
if (deltas.isEmpty())
{
elements = NO_ELEMENTS;
}
else
{
elements = deltas.toArray(new IDBDelta[deltas.size()]);
Arrays.sort(elements);
}
}
return elements;
}
protected final void resetElements()
{
elements = null;
}
protected abstract void collectElements(List<IDBDelta> elements);
@Override
public void dump(Writer writer) throws IOException
{
int level = getLevel();
for (int i = 0; i < level; i++)
{
writer.append(" ");
}
writer.append(getChangeKind().toString());
writer.append(" ");
writer.append(getDeltaType().toString());
writer.append(" ");
writer.append(getName());
dumpAdditionalProperties(writer);
writer.append(StringUtil.NL);
for (IDBDelta delta : getElements())
{
((DBDelta)delta).dump(writer);
}
}
protected void dumpAdditionalProperties(Writer writer) throws IOException
{
}
private int getLevel()
{
if (parent == null)
{
return 0;
}
return parent.getLevel() + 1;
}
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 = DBSchemaElement.findElement(oldElements, name);
comparator.compare(element, oldElement);
}
for (int i = 0; i < oldElements.length; i++)
{
T oldElement = oldElements[i];
String name = oldElement.getName();
if (DBSchemaElement.findElement(elements, name) == null)
{
comparator.compare(null, oldElement);
}
}
}
/**
* @author Eike Stepper
*/
public interface SchemaElementComparator<T extends IDBSchemaElement>
{
public void compare(T element, T oldElement);
}
}
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