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Consistent ordering of entries in jsondb (openhab#2437)
* Consistent ordering of entries in jsondb Resolves openhab#2436. Signed-off-by: Sami Salonen <ssalonen@gmail.com>
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62 changes: 62 additions & 0 deletions
62
...ab.core.config.core/src/main/java/org/openhab/core/config/core/OrderingMapSerializer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| /** | ||
| * Copyright (c) 2010-2021 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.core.config.core; | ||
|
|
||
| import java.lang.reflect.Type; | ||
| import java.util.Comparator; | ||
| import java.util.Map; | ||
| import java.util.Map.Entry; | ||
| import java.util.stream.Stream; | ||
|
|
||
| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
|
|
||
| import com.google.gson.JsonElement; | ||
| import com.google.gson.JsonObject; | ||
| import com.google.gson.JsonSerializationContext; | ||
| import com.google.gson.JsonSerializer; | ||
|
|
||
| /** | ||
| * Serializes map data by ordering the keys | ||
| * | ||
| * @author Sami Salonen - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public class OrderingMapSerializer implements JsonSerializer<Map<@Nullable Object, @Nullable Object>> { | ||
|
|
||
| @SuppressWarnings({ "rawtypes", "unchecked", "null" }) | ||
| @Override | ||
| public JsonElement serialize(Map<@Nullable Object, @Nullable Object> src, Type typeOfSrc, | ||
| JsonSerializationContext context) { | ||
| JsonObject ordered = new JsonObject(); | ||
| final Stream<Entry<@Nullable Object, @Nullable Object>> possiblySortedStream; | ||
| if (OrderingSetSerializer.allSameClassAndComparable(src.keySet())) { | ||
| // Map keys are comparable as verified above so casting to plain Comparator is safe | ||
| possiblySortedStream = src.entrySet().stream().sorted((Comparator) Map.Entry.comparingByKey()); | ||
| } else { | ||
| possiblySortedStream = src.entrySet().stream(); | ||
| } | ||
| possiblySortedStream.forEachOrdered(entry -> { | ||
| Object key = entry.getKey(); | ||
| if (key instanceof String) { | ||
| ordered.add((String) key, context.serialize(entry.getValue())); | ||
| } else { | ||
| JsonElement serialized = context.serialize(key); | ||
| ordered.add(serialized.isJsonPrimitive() ? serialized.getAsString() : serialized.toString(), | ||
| context.serialize(entry.getValue())); | ||
| } | ||
|
|
||
| }); | ||
| return ordered; | ||
| } | ||
| } |
64 changes: 64 additions & 0 deletions
64
...ab.core.config.core/src/main/java/org/openhab/core/config/core/OrderingSetSerializer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /** | ||
| * Copyright (c) 2010-2021 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.core.config.core; | ||
|
|
||
| import java.lang.reflect.Type; | ||
| import java.util.Set; | ||
| import java.util.stream.Stream; | ||
|
|
||
| import org.eclipse.jdt.annotation.NonNullByDefault; | ||
| import org.eclipse.jdt.annotation.Nullable; | ||
|
|
||
| import com.google.gson.JsonArray; | ||
| import com.google.gson.JsonElement; | ||
| import com.google.gson.JsonSerializationContext; | ||
| import com.google.gson.JsonSerializer; | ||
|
|
||
| /** | ||
| * Serializes set by ordering the elements | ||
| * | ||
| * @author Sami Salonen - Initial contribution | ||
| */ | ||
| @NonNullByDefault | ||
| public class OrderingSetSerializer implements JsonSerializer<Set<@Nullable Object>> { | ||
|
|
||
| public static boolean allSameClassAndComparable(Set<@Nullable Object> src) { | ||
| Class<?> expectedClass = null; | ||
| for (Object object : src) { | ||
| if (!(object instanceof Comparable<?>)) { | ||
| // not comparable or simply null | ||
| return false; | ||
| } else if (expectedClass == null) { | ||
| // first item | ||
| expectedClass = object.getClass(); | ||
| } else if (!object.getClass().equals(expectedClass)) { | ||
| // various classes in the Set, let's not try to sort | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public JsonElement serialize(Set<@Nullable Object> src, Type typeOfSrc, JsonSerializationContext context) { | ||
| JsonArray ordered = new JsonArray(); | ||
| final Stream<@Nullable Object> possiblySortedStream; | ||
| if (allSameClassAndComparable(src)) { | ||
| possiblySortedStream = src.stream().sorted(); | ||
| } else { | ||
| possiblySortedStream = src.stream(); | ||
| } | ||
| possiblySortedStream.map(context::serialize).forEachOrdered(ordered::add); | ||
| return ordered; | ||
| } | ||
| } |
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