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   1 /**
   2  * Copyright (c) 2010-2021 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.http.internal.converter;
  14
  15 import java.util.function.Consumer;
  16
  17 import javax.measure.format.MeasurementParseException;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.openhab.binding.http.internal.config.HttpChannelConfig;
  22 import org.openhab.binding.http.internal.transform.ValueTransformation;
  23 import org.openhab.core.library.types.DecimalType;
  24 import org.openhab.core.library.types.QuantityType;
  25 import org.openhab.core.types.Command;
  26 import org.openhab.core.types.State;
  27 import org.openhab.core.types.UnDefType;
  28
  29 /**
  30  * The {@link NumberItemConverter} implements {@link org.openhab.core.library.items.NumberItem} conversions
  31  *
  32  * @author Jan N. Klug - Initial contribution
  33  */
  34 @NonNullByDefault
  35 public class NumberItemConverter extends AbstractTransformingItemConverter {
  36
  37     public NumberItemConverter(Consumer<State> updateState, Consumer<Command> postCommand,
  38             @Nullable Consumer<String> sendHttpValue, ValueTransformation stateTransformations,
  39             ValueTransformation commandTransformations, HttpChannelConfig channelConfig) {
  40         super(updateState, postCommand, sendHttpValue, stateTransformations, commandTransformations, channelConfig);
  41     }
  42
  43     @Override
  44     protected @Nullable Command toCommand(String value) {
  45         return null;
  46     }
  47
  48     @Override
  49     protected State toState(String value) {
  50         String trimmedValue = value.trim();
  51         if (!trimmedValue.isEmpty()) {
  52             try {
  53                 if (channelConfig.unit != null) {
  54                     // we have a given unit - use that
  55                     return new QuantityType<>(trimmedValue + " " + channelConfig.unit);
  56                 } else {
  57                     try {
  58                         // try if we have a simple number
  59                         return new DecimalType(trimmedValue);
  60                     } catch (IllegalArgumentException e1) {
  61                         // not a plain number, maybe with unit?
  62                         return new QuantityType<>(trimmedValue);
  63                     }
  64                 }
  65             } catch (IllegalArgumentException | MeasurementParseException e) {
  66                 // finally failed
  67             }
  68         }
  69         return UnDefType.UNDEF;
  70     }
  71
  72     @Override
  73     protected String toString(Command command) {
  74         return command.toString();
  75     }
  76 }