| /* |
| * Copyright (c) 2007-2009, 2011, 2012, 2015 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 |
| * Simon McDuff - bug 210868 |
| */ |
| package org.eclipse.emf.cdo.server; |
| |
| import org.eclipse.emf.cdo.common.revision.CDORevision; |
| import org.eclipse.emf.cdo.session.CDOCollectionLoadingPolicy; |
| |
| import org.eclipse.emf.ecore.EStructuralFeature; |
| |
| import java.util.List; |
| |
| /** |
| * Reads {@link Chunk chunks} of |
| * {@link org.eclipse.emf.cdo.session.CDOSession.Options#setCollectionLoadingPolicy(CDOCollectionLoadingPolicy) |
| * partially loaded} lists from a physical data storage backend. |
| * |
| * @author Eike Stepper |
| * @apiviz.uses {@link IStoreChunkReader.Chunk} - - reads |
| */ |
| public interface IStoreChunkReader |
| { |
| /** |
| * @since 2.0 |
| */ |
| public IStoreAccessor getAccessor(); |
| |
| public CDORevision getRevision(); |
| |
| /** |
| * @since 2.0 |
| */ |
| public EStructuralFeature getFeature(); |
| |
| public void addSimpleChunk(int index); |
| |
| /** |
| * @param fromIndex |
| * Inclusive value. |
| * @param toIndex |
| * Exclusive value. |
| */ |
| public void addRangedChunk(int fromIndex, int toIndex); |
| |
| public List<Chunk> executeRead(); |
| |
| /** |
| * Represents a {@link List#subList(int, int) sublist} of consecutive elements that are subject to <i>partial |
| * collection loading</i>. |
| * |
| * @author Eike Stepper |
| */ |
| public static class Chunk |
| { |
| private int startIndex; |
| |
| private Object ids; |
| |
| public Chunk(int startIndex) |
| { |
| this.startIndex = startIndex; |
| } |
| |
| public Chunk(int startIndex, int size) |
| { |
| this(startIndex); |
| ids = new Object[size]; |
| } |
| |
| public int getStartIndex() |
| { |
| return startIndex; |
| } |
| |
| public int size() |
| { |
| return ids instanceof Object[] ? ((Object[])ids).length : 1; |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| public Object get(int indexInChunk) |
| { |
| if (ids instanceof Object[]) |
| { |
| return ((Object[])ids)[indexInChunk]; |
| } |
| |
| if (indexInChunk == 0) |
| { |
| return ids; |
| } |
| |
| throw new ArrayIndexOutOfBoundsException(indexInChunk); |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| public void add(int indexInChunk, Object value) |
| { |
| if (ids instanceof Object[]) |
| { |
| ((Object[])ids)[indexInChunk] = value; |
| } |
| else |
| { |
| if (indexInChunk == 0) |
| { |
| ids = value; |
| return; |
| } |
| |
| throw new ArrayIndexOutOfBoundsException(indexInChunk); |
| } |
| } |
| } |
| } |