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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
*/
package org.eclipse.emf.cdo.internal.server;
import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.protocol.CDOProtocolConstants;
import org.eclipse.emf.cdo.common.util.CDOQueryInfo;
import org.eclipse.emf.cdo.server.IQueryContext;
import org.eclipse.emf.cdo.server.IQueryHandler;
import org.eclipse.emf.cdo.server.IStoreAccessor;
import org.eclipse.emf.cdo.server.StoreThreadLocal;
import org.eclipse.emf.cdo.spi.server.QueryHandlerFactory;
import org.eclipse.net4j.util.factory.ProductCreationException;
import java.util.HashSet;
import java.util.Set;
/**
* @author Eike Stepper
* @since 2.0
*/
public class ResourcesQueryHandler implements IQueryHandler
{
public ResourcesQueryHandler()
{
}
public void executeQuery(CDOQueryInfo info, IQueryContext context)
{
IStoreAccessor accessor = StoreThreadLocal.getAccessor();
QueryContext resourcesContext = new QueryContext(info, context);
accessor.queryResources(resourcesContext);
CDOBranchPoint branchPoint = context;
CDOBranch branch = branchPoint.getBranch();
while (!branch.isMainBranch() && resourcesContext.getResourceIDs().size() < info.getMaxResults())
{
branchPoint = branch.getBase();
branch = branchPoint.getBranch();
resourcesContext.setBranchPoint(branchPoint);
accessor.queryResources(resourcesContext);
}
}
/**
* @author Eike Stepper
* @since 3.0
*/
private static final class QueryContext implements IStoreAccessor.QueryResourcesContext
{
private CDOQueryInfo info;
private IQueryContext context;
private CDOBranchPoint branchPoint;
private Set<CDOID> resourceIDs = new HashSet<CDOID>();
public QueryContext(CDOQueryInfo info, IQueryContext context)
{
this.info = info;
this.context = context;
branchPoint = context;
}
public void setBranchPoint(CDOBranchPoint branchPoint)
{
this.branchPoint = branchPoint;
}
public Set<CDOID> getResourceIDs()
{
return resourceIDs;
}
public CDOBranch getBranch()
{
return branchPoint.getBranch();
}
public long getTimeStamp()
{
return branchPoint.getTimeStamp();
}
public CDOID getFolderID()
{
return (CDOID)info.getParameters().get(CDOProtocolConstants.QUERY_LANGUAGE_RESOURCES_FOLDER_ID);
}
public String getName()
{
return info.getQueryString();
}
public boolean exactMatch()
{
return (Boolean)info.getParameters().get(CDOProtocolConstants.QUERY_LANGUAGE_RESOURCES_EXACT_MATCH);
}
public int getMaxResults()
{
return info.getMaxResults();
}
public boolean addResource(CDOID resourceID)
{
if (resourceIDs.add(resourceID))
{
return context.addResult(resourceID);
}
return true;
}
}
/**
* @author Eike Stepper
* @since 2.0
*/
public static class Factory extends QueryHandlerFactory
{
public Factory()
{
super(CDOProtocolConstants.QUERY_LANGUAGE_RESOURCES);
}
@Override
public ResourcesQueryHandler create(String description) throws ProductCreationException
{
return new ResourcesQueryHandler();
}
}
}
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