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/*
* Copyright (c) 2012, 2013 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.emf.cdo.transaction;
import org.eclipse.net4j.util.collection.Closeable;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.lifecycle.ILifecycle;
import org.eclipse.net4j.util.lifecycle.LifecycleEventAdapter;
/**
* A utility class that, when associated with a {@link CDOTransaction transaction}, automatically updates the
* {@link CDOTransaction#setCommitComment(String) commit comment} according to local model modifications.
*
* @author Eike Stepper
* @since 4.2
*/
public class CDOTransactionCommentator implements Closeable
{
private final IListener transactionListener = new LifecycleEventAdapter()
{
@Override
protected void onDeactivated(ILifecycle lifecycle)
{
close();
}
};
private final CDOTransactionHandler2 transactionHandler = new CDOTransactionHandler2()
{
private String lastComment;
public void committingTransaction(CDOTransaction transaction, CDOCommitContext commitContext)
{
lastComment = createComment(commitContext);
if (lastComment != null)
{
String commitComment = transaction.getCommitComment();
if (commitComment != null)
{
transaction.setCommitComment(commitComment = " " + lastComment);
}
else
{
transaction.setCommitComment(lastComment);
}
}
}
public void committedTransaction(CDOTransaction transaction, CDOCommitContext commitContext)
{
cleanUp();
}
public void rolledBackTransaction(CDOTransaction transaction)
{
cleanUp();
}
private void cleanUp()
{
if (lastComment != null)
{
String commitComment = transaction.getCommitComment();
if (commitComment != null)
{
if (commitComment.endsWith(lastComment))
{
commitComment = commitComment.substring(0, commitComment.length() - lastComment.length());
transaction.setCommitComment(commitComment.trim());
}
}
}
lastComment = null;
}
};
private CDOTransaction transaction;
public CDOTransactionCommentator(CDOTransaction transaction)
{
this.transaction = transaction;
transaction.addListener(transactionListener);
transaction.addTransactionHandler(transactionHandler);
}
public final CDOTransaction getTransaction()
{
return transaction;
}
public final boolean isClosed()
{
return transaction == null;
}
public void close()
{
transaction.removeTransactionHandler(transactionHandler);
transaction.removeListener(transactionListener);
transaction = null;
}
protected String createComment(CDOCommitContext commitContext)
{
StringBuilder builder = new StringBuilder("<");
appendSummary(builder, commitContext);
builder.append(">");
return builder.toString();
}
/**
* @since 4.2
*/
public static void appendSummary(StringBuilder builder, CDOCommitContext commitContext)
{
boolean needComma = false;
needComma |= appendSummary(builder, needComma, commitContext.getNewObjects().size(), "addition");
needComma |= appendSummary(builder, needComma, commitContext.getDirtyObjects().size(), "change");
needComma |= appendSummary(builder, needComma, commitContext.getDetachedObjects().size(), "removal");
}
private static boolean appendSummary(StringBuilder builder, boolean needComma, int count, String label)
{
if (count > 0)
{
if (needComma)
{
builder.append(", ");
}
builder.append(count);
builder.append(" ");
builder.append(label);
if (count > 1)
{
builder.append("s");
}
return true;
}
return false;
}
}
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