org.modeshape.jcr.query.process.package-info Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
* See the AUTHORS.txt file in the distribution for a full listing of
* individual contributors.
*
* ModeShape is free software. Unless otherwise indicated, all code in ModeShape
* is licensed to you under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* ModeShape is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
/**
* This package defines the {@link org.modeshape.jcr.query.process.QueryProcessor} interface, which is responsible for constructing for each query
* a tree of {@link org.modeshape.jcr.query.process.ProcessingComponent} objects that each are responsible for processing a specific aspect of
* the query and returning the tuples to the parent component.
*
* At the bottom are the "access" components that perform the low-level access of the tuples from the graph container.
* Above these are the other components that implement various operations, such as limits, joins (using merge and
* nested loop algorithms), unions, intersects, distinct, sorts, and even column projections. At the top is
* a single component that produces tuples that represent the results of the query.
*
*
* Once the {@link org.modeshape.jcr.query.process.QueryProcessor} creates the ProcessingComponent assembly,
* the top-level component is executed. Execution involves requesting from the child processing component(s) the next batch of results,
* processing each of the tuples according to the specific ProcessingComponent algorithm, and finally returning
* the processed tuples.
*
*/
package org.modeshape.jcr.query.process;