Mercurial > hg > release > thermostat-1.6
view storage/core/src/main/java/com/redhat/thermostat/storage/core/experimental/statement/CategoryBuilder.java @ 2049:a92d602216ad
Update copyright license headers for 2017
PR3290
Reviewed-by: jerboaa
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-January/021974.html
author | Andrew Azores <aazores@redhat.com> |
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date | Tue, 17 Jan 2017 12:19:56 -0500 |
parents | 31f274ab27a5 |
children |
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/* * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat 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 * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.storage.core.experimental.statement; import com.redhat.thermostat.storage.core.Category; import com.redhat.thermostat.storage.core.Key; import com.redhat.thermostat.storage.model.Pojo; import java.lang.reflect.Constructor; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * */ public class CategoryBuilder<T extends Pojo> { private static final String LOCK = new String("CategoryBuilder_lock"); private static final Map<String, Category> categories = new HashMap<>(); private Class<T> bean; public CategoryBuilder(Class<T> bean) { this.bean = bean; } public Category<T> build() { synchronized (LOCK) { String document = StatementUtils.getDocument(bean); // This helps performance as well, but it's needed because Category // doesn't allow us to create the same twice, even with all the // same data; categories are in fact some kind of singleton if (categories.containsKey(document)) { return categories.get(document); } List<FieldDescriptor> descriptors = StatementUtils.createDescriptors(bean); // we first build the keys and the indexed keys List<Key> indexed = new ArrayList<>(); List<Key> keys = new ArrayList<>(); // key are easy, the arguments are in the form: // new Key<Type>(String name), we don't need reflection for (FieldDescriptor descriptor : descriptors) { Key key = new Key(descriptor.getName()); keys.add(key); if (descriptor.isIndexed()) { indexed.add(key); } } List<Class> argumentClasses = new ArrayList<>(); argumentClasses.add(String.class); argumentClasses.add(Class.class); argumentClasses.add(List.class); List argumentObjects = new ArrayList(); argumentObjects.add(document); argumentObjects.add(bean); argumentObjects.add(keys); // indexed keys are optional if (!indexed.isEmpty()) { argumentClasses.add(List.class); argumentObjects.add(indexed); } Class[] classes = argumentClasses.toArray(new Class[argumentClasses.size()]); Object[] objects = argumentObjects.toArray(); Category<T> category = create(classes, objects); categories.put(document, category); return category; } } private Category<T> create(Class[] classes, Object[] objects) { // we are using this constructor: // Category(String name, Class<T> dataClass, // List<Key<?>> keys, List<Key<?>> indexedKeys) try { Constructor<Category> constructor = Category.class.getConstructor(classes); constructor.setAccessible(true); return constructor.newInstance(objects); } catch (ReflectiveOperationException e) { throw new RuntimeException(e); } } }