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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.homematic.internal.converter;
  14
  15 import static org.openhab.binding.homematic.internal.HomematicBindingConstants.*;
  16
  17 import java.util.HashMap;
  18 import java.util.Map;
  19
  20 import org.openhab.binding.homematic.internal.converter.type.DecimalTypeConverter;
  21 import org.openhab.binding.homematic.internal.converter.type.OnOffTypeConverter;
  22 import org.openhab.binding.homematic.internal.converter.type.OpenClosedTypeConverter;
  23 import org.openhab.binding.homematic.internal.converter.type.PercentTypeConverter;
  24 import org.openhab.binding.homematic.internal.converter.type.QuantityTypeConverter;
  25 import org.openhab.binding.homematic.internal.converter.type.StringTypeConverter;
  26
  27 /**
  28  * A factory for creating converters based on the itemType.
  29  *
  30  * @author Gerhard Riegler - Initial contribution
  31  * @author Michael Reitler - QuantityType support
  32  */
  33 public class ConverterFactory {
  34     private static Map<String, TypeConverter<?>> converterCache = new HashMap<>();
  35
  36     /**
  37      * Returns the converter for an itemType.
  38      */
  39     public static TypeConverter<?> createConverter(String itemType) throws ConverterException {
  40         Class<? extends TypeConverter<?>> converterClass = null;
  41
  42         if (itemType.startsWith(ITEM_TYPE_NUMBER + ":")) {
  43             converterClass = QuantityTypeConverter.class;
  44         } else {
  45             switch (itemType) {
  46                 case ITEM_TYPE_SWITCH:
  47                     converterClass = OnOffTypeConverter.class;
  48                     break;
  49                 case ITEM_TYPE_ROLLERSHUTTER:
  50                 case ITEM_TYPE_DIMMER:
  51                     converterClass = PercentTypeConverter.class;
  52                     break;
  53                 case ITEM_TYPE_CONTACT:
  54                     converterClass = OpenClosedTypeConverter.class;
  55                     break;
  56                 case ITEM_TYPE_STRING:
  57                     converterClass = StringTypeConverter.class;
  58                     break;
  59                 case ITEM_TYPE_NUMBER:
  60                     converterClass = DecimalTypeConverter.class;
  61                     break;
  62             }
  63         }
  64
  65         TypeConverter<?> converter = null;
  66         if (converterClass != null) {
  67             converter = converterCache.get(converterClass.getName());
  68             if (converter == null) {
  69                 try {
  70                     converter = converterClass.getConstructor().newInstance();
  71                     converterCache.put(converterClass.getName(), converter);
  72                 } catch (Exception e) {
  73                     // ignore
  74                 }
  75             }
  76         }
  77         if (converter == null) {
  78             throw new ConverterException("Can't find a converter for type '" + itemType + "'");
  79         }
  80         return converter;
  81     }
  82 }