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[mqtt.homeassistant] Use Jinjava directly (openhab#17378)
* [mqtt.homeassistant] Use Jinjava directly Signed-off-by: Cody Cutrer <cody@cutrer.us>
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122 changes: 122 additions & 0 deletions
122
...a/org/openhab/binding/mqtt/homeassistant/internal/HomeAssistantChannelTransformation.java
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|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /** | ||
| * Copyright (c) 2010-2024 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.openhab.binding.mqtt.homeassistant.internal; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import java.util.Optional; | ||
|
|
||
| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
| import org.openhab.binding.mqtt.homeassistant.internal.component.AbstractComponent; | ||
| import org.openhab.core.thing.binding.generic.ChannelTransformation; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.hubspot.jinjava.Jinjava; | ||
| import com.hubspot.jinjava.interpret.FatalTemplateErrorsException; | ||
|
|
||
| /** | ||
| * Provides a channel transformation for a Home Assistant channel with a | ||
| * Jinja2 template, providing the additional context and extensions required by Home Assistant | ||
| * Based in part on the JinjaTransformationService | ||
| * | ||
| * @author Cody Cutrer - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public class HomeAssistantChannelTransformation extends ChannelTransformation { | ||
| private final Logger logger = LoggerFactory.getLogger(HomeAssistantChannelTransformation.class); | ||
|
|
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| private final Jinjava jinjava; | ||
| private final AbstractComponent component; | ||
| private final String template; | ||
| private final ObjectMapper objectMapper = new ObjectMapper(); | ||
|
|
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| public HomeAssistantChannelTransformation(Jinjava jinjava, AbstractComponent component, String template) { | ||
| super((String) null); | ||
| this.jinjava = jinjava; | ||
| this.component = component; | ||
| this.template = template; | ||
| } | ||
|
|
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| @Override | ||
| public boolean isEmpty() { | ||
| return template.isEmpty(); | ||
| } | ||
|
|
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| @Override | ||
| public Optional<String> apply(String value) { | ||
| String transformationResult; | ||
| Map<String, @Nullable Object> bindings = new HashMap<>(); | ||
|
|
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| logger.debug("about to transform '{}' by the function '{}'", value, template); | ||
|
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| bindings.put("value", value); | ||
|
|
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| try { | ||
| JsonNode tree = objectMapper.readTree(value); | ||
| bindings.put("value_json", toObject(tree)); | ||
| } catch (IOException e) { | ||
| // ok, then value_json is null... | ||
| } | ||
|
|
||
| try { | ||
| transformationResult = jinjava.render(template, bindings); | ||
| } catch (FatalTemplateErrorsException e) { | ||
| logger.warn("Applying template {} for component {} failed: {}", template, | ||
| component.getHaID().toShortTopic(), e.getMessage()); | ||
| return Optional.empty(); | ||
| } | ||
|
|
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| logger.debug("transformation resulted in '{}'", transformationResult); | ||
|
|
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| return Optional.of(transformationResult); | ||
| } | ||
|
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| private static @Nullable Object toObject(JsonNode node) { | ||
| switch (node.getNodeType()) { | ||
| case ARRAY: { | ||
| List<@Nullable Object> result = new ArrayList<>(); | ||
| for (JsonNode el : node) { | ||
| result.add(toObject(el)); | ||
| } | ||
| return result; | ||
| } | ||
| case NUMBER: | ||
| return node.decimalValue(); | ||
| case OBJECT: { | ||
| Map<String, @Nullable Object> result = new HashMap<>(); | ||
| Iterator<Entry<String, JsonNode>> it = node.fields(); | ||
| while (it.hasNext()) { | ||
| Entry<String, JsonNode> field = it.next(); | ||
| result.put(field.getKey(), toObject(field.getValue())); | ||
| } | ||
| return result; | ||
| } | ||
| case STRING: | ||
| return node.asText(); | ||
| case BOOLEAN: | ||
| return node.asBoolean(); | ||
| case NULL: | ||
| default: | ||
| return null; | ||
| } | ||
| } | ||
| } |
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