1 /* 2 * ModeShape (http://www.modeshape.org) 3 * See the COPYRIGHT.txt file distributed with this work for information 4 * regarding copyright ownership. Some portions may be licensed 5 * to Red Hat, Inc. under one or more contributor license agreements. 6 * See the AUTHORS.txt file in the distribution for a full listing of 7 * individual contributors. 8 * 9 * ModeShape is free software. Unless otherwise indicated, all code in ModeShape 10 * is licensed to you under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * ModeShape is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this software; if not, write to the Free 21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 23 */ 24 package org.modeshape.graph.query.process; 25 26 import java.util.List; 27 import org.modeshape.graph.query.model.Column; 28 import org.modeshape.graph.query.plan.PlanNode.Type; 29 30 /** 31 * A {@link ProcessingComponent} implementation that performs a {@link Type#PROJECT PROJECT} operation to reduce the columns that 32 * appear in the results. 33 */ 34 public class ProjectComponent extends DelegatingComponent { 35 36 public ProjectComponent( ProcessingComponent delegate, 37 List<Column> columns ) { 38 super(delegate, delegate.getColumns().subSelect(columns)); 39 } 40 41 /** 42 * {@inheritDoc} 43 * 44 * @see org.modeshape.graph.query.process.ProcessingComponent#execute() 45 */ 46 @Override 47 public List<Object[]> execute() { 48 return delegate().execute(); 49 } 50 }