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/*
* Copyright (c) 2004 - 2011 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
* Stefan Winkler - Bug 283998: [DB] Chunk reading for multiple chunks fails
* Victor Roldan Betancort - Bug 283998: [DB] Chunk reading for multiple chunks fails
*/
package org.eclipse.emf.cdo.server.internal.db;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.server.db.IDBStoreChunkReader;
import org.eclipse.emf.cdo.server.db.mapping.IClassMapping;
import org.eclipse.emf.cdo.server.db.mapping.IListMapping;
import org.eclipse.emf.cdo.server.db.mapping.IMappingStrategy;
import org.eclipse.emf.cdo.spi.server.StoreChunkReader;
import org.eclipse.emf.ecore.EStructuralFeature;
import java.util.List;
/**
* @author Eike Stepper
*/
public class DBStoreChunkReader extends StoreChunkReader implements IDBStoreChunkReader
{
private IListMapping referenceMapping;
private StringBuilder builder = new StringBuilder();
public DBStoreChunkReader(DBStoreAccessor accessor, CDORevision revision, EStructuralFeature feature)
{
super(accessor, revision, feature);
IMappingStrategy mappingStrategy = accessor.getStore().getMappingStrategy();
IClassMapping mapping = mappingStrategy.getClassMapping(revision.getEClass());
referenceMapping = mapping.getListMapping(feature);
}
@Override
public DBStoreAccessor getAccessor()
{
return (DBStoreAccessor)super.getAccessor();
}
@Override
public void addSimpleChunk(int index)
{
super.addSimpleChunk(index);
prepareAddition();
builder.append(CDODBSchema.LIST_IDX);
builder.append('=');
builder.append(index);
}
@Override
public void addRangedChunk(int fromIndex, int toIndex)
{
super.addRangedChunk(fromIndex, toIndex);
prepareAddition();
builder.append(CDODBSchema.LIST_IDX);
builder.append(" BETWEEN "); //$NON-NLS-1$
builder.append(fromIndex);
builder.append(" AND "); //$NON-NLS-1$
builder.append(toIndex - 1);
}
public List<Chunk> executeRead()
{
List<Chunk> chunks = getChunks();
if (chunks.size() > 1)
{
builder.insert(0, '(');
builder.append(')');
}
referenceMapping.readChunks(this, chunks, builder.toString());
return chunks;
}
private void prepareAddition()
{
// If not empty, a chunk has been already added, and the next condition needs to be OR-ed
if (builder.length() > 0)
{
builder.append(" OR "); //$NON-NLS-1$
}
}
}
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