| /** |
| * 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(); |
| } |
| } |
| } |