001/******************************************************************************* 002 * Copyright (c) 2016 Diamond Light Source Ltd. and others. 003 * All rights reserved. This program and the accompanying materials 004 * are made available under the terms of the Eclipse Public License v1.0 005 * which accompanies this distribution, and is available at 006 * http://www.eclipse.org/legal/epl-v10.html 007 * 008 * Contributors: 009 * Diamond Light Source Ltd - initial API and implementation 010 *******************************************************************************/ 011package org.eclipse.january.metadata; 012 013import java.lang.reflect.Method; 014import java.util.HashMap; 015import java.util.Map; 016 017import org.eclipse.january.MetadataException; 018import org.eclipse.january.dataset.LazyDatasetBase; 019import org.eclipse.january.metadata.internal.AxesMetadataImpl; 020import org.eclipse.january.metadata.internal.DimensionMetadataImpl; 021import org.eclipse.january.metadata.internal.ErrorMetadataImpl; 022import org.eclipse.january.metadata.internal.MaskMetadataImpl; 023import org.eclipse.january.metadata.internal.OriginMetadataImpl; 024import org.eclipse.january.metadata.internal.PeemMetadataImpl; 025import org.eclipse.january.metadata.internal.StatisticsMetadataImpl; 026 027public class MetadataFactory { 028 029 private MetadataFactory() { 030 } 031 032 static Map<Class<? extends MetadataType>, Class<? extends MetadataType>> metadataClasses = createMap(); 033 private static Map<Class<? extends MetadataType>, Class<? extends MetadataType>> createMap() { 034 Map<Class<? extends MetadataType>, Class<? extends MetadataType>> map = new HashMap<Class<? extends MetadataType>, Class<? extends MetadataType>>(); 035 map.put(IMetadata.class, Metadata.class); 036 map.put(ErrorMetadata.class, ErrorMetadataImpl.class); 037 map.put(AxesMetadata.class, AxesMetadataImpl.class); 038 map.put(DimensionMetadata.class, DimensionMetadataImpl.class); 039 map.put(MaskMetadata.class, MaskMetadataImpl.class); 040 map.put(OriginMetadata.class, OriginMetadataImpl.class); 041 map.put(PeemMetadata.class, PeemMetadataImpl.class); 042 map.put(StatisticsMetadata.class, StatisticsMetadataImpl.class); 043 return map; 044 } 045 046 047 /** 048 * Create a metadata object of given class with given arguments 049 * @param clazz 050 * @param arguments these must match the arguments given in the initialize method specified in the class 051 * @return metadata object or null if type not available 052 * @throws MetadataException if the class cannot be instantiated, the initialize method does not exist, or 053 * the initialize method could not be called successfully 054 */ 055 public static <T extends MetadataType> T createMetadata(Class<T> clazz, Object... arguments) throws MetadataException { 056 @SuppressWarnings("unchecked") 057 Class<T> mdClass = (Class<T>) metadataClasses.get(clazz); 058 if (mdClass == null) { 059 return null; 060 } 061 062 T obj = null; 063 try { 064 obj = mdClass.newInstance(); 065 } catch (Exception e) { 066 throw new MetadataException("Could not create metadata object", e); 067 } 068 069 try { 070 for (Method m : mdClass.getMethods()) { 071 if (m.getName().equals("initialize")) { 072 m.invoke(obj, arguments); 073 return obj; 074 } 075 } 076 } catch (Exception e) { 077 throw new MetadataException("Could not initialize object", e); 078 } 079 throw new MetadataException("Could not find initialize method"); 080 } 081 082 /** 083 * Register metadata class 084 * @param clazz 085 */ 086 public static <T extends MetadataType> void registerClass(Class<T> clazz) { 087 Class<? extends MetadataType> iClass = LazyDatasetBase.findMetadataTypeSubInterfaces(clazz); 088 089 metadataClasses.put(iClass, clazz); 090 } 091}