| /** |
| * 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 |
| * Victor Roldan Betancort - bug 208689 |
| */ |
| package org.eclipse.emf.cdo.server.internal.db; |
| |
| import org.eclipse.emf.cdo.common.id.CDOID; |
| import org.eclipse.emf.cdo.server.db.IDBStoreAccessor; |
| import org.eclipse.emf.cdo.server.db.IIDHandler; |
| import org.eclipse.emf.cdo.server.db.mapping.IMappingStrategy; |
| |
| import org.eclipse.net4j.db.DBException; |
| import org.eclipse.net4j.db.DBUtil; |
| import org.eclipse.net4j.util.collection.CloseableIterator; |
| |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public abstract class ObjectIDIterator implements CloseableIterator<CDOID> |
| { |
| private IMappingStrategy mappingStrategy; |
| |
| private IIDHandler idHandler; |
| |
| private IDBStoreAccessor accessor; |
| |
| private ResultSet currentResultSet; |
| |
| private CDOID nextID; |
| |
| private boolean closed; |
| |
| /** |
| * Creates an iterator over all objects in a store. It is important to {@link #close()} of this iterator after usage |
| * to properly close internal result sets. |
| */ |
| public ObjectIDIterator(IMappingStrategy mappingStrategy, IDBStoreAccessor accessor) |
| { |
| this.mappingStrategy = mappingStrategy; |
| this.accessor = accessor; |
| idHandler = getMappingStrategy().getStore().getIDHandler(); |
| |
| } |
| |
| public void close() |
| { |
| closeCurrentResultSet(); |
| nextID = null; |
| closed = true; |
| } |
| |
| public boolean isClosed() |
| { |
| return closed; |
| } |
| |
| public IMappingStrategy getMappingStrategy() |
| { |
| return mappingStrategy; |
| } |
| |
| public IDBStoreAccessor getAccessor() |
| { |
| return accessor; |
| } |
| |
| public boolean hasNext() |
| { |
| if (closed) |
| { |
| return false; |
| } |
| |
| nextID = null; |
| for (;;) |
| { |
| if (currentResultSet == null) |
| { |
| currentResultSet = getNextResultSet(); |
| if (currentResultSet == null) |
| { |
| return false; |
| } |
| } |
| |
| try |
| { |
| if (currentResultSet.next()) |
| { |
| nextID = idHandler.getCDOID(currentResultSet, 1); |
| return true; |
| } |
| |
| closeCurrentResultSet(); |
| |
| currentResultSet = null; |
| return false; |
| } |
| catch (SQLException ex) |
| { |
| throw new DBException(ex); |
| } |
| } |
| } |
| |
| protected void closeCurrentResultSet() |
| { |
| DBUtil.close(currentResultSet); |
| } |
| |
| public CDOID next() |
| { |
| if (nextID == null) |
| { |
| throw new NoSuchElementException(); |
| } |
| |
| return nextID; |
| } |
| |
| public void remove() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| protected abstract ResultSet getNextResultSet(); |
| } |