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MapToEntriesArraySerializer.java
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MapToEntriesArraySerializer.java
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/*
* Copyright (c) 2019, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
package org.eclipse.yasson.internal.serializer;
import java.util.Map;
import jakarta.json.bind.serializer.SerializationContext;
import jakarta.json.stream.JsonGenerator;
/**
* Serialize {@link Map} with {@link Object} keys as an array of map entries JSON Objects:
* <pre>
* [
* {
* "key": JsonValue,
* "value": JsonValue
* }, ...
* ]
* </pre>
*
* @param <K> {@link Map} key type to serialize
* @param <V> {@link Map} value type to serialize
*/
public class MapToEntriesArraySerializer<K, V> implements MapSerializer.Delegate<K, V> {
/**
* Default {@code JsonObject} property name for map entry key.
*/
private static final String DEFAULT_KEY_ENTRY_NAME = "key";
/**
* Default {@code JsonObject} property name for map entry value.
*/
private static final String DEFAULT_VALUE_ENTRY_NAME = "value";
/**
* Reference to {@link Map} serialization entry point. Contains serialization setup information.
*/
private final MapSerializer<K, V> serializer;
/**
* {@code JsonObject} property name for map entry key.
*/
private final String keyEntryName;
/**
* {@code JsonObject} property name for map entry value.
*/
private final String valueEntryName;
/**
* Creates new map to entries array serializer.
*
* @param serializer map serializer
*/
protected MapToEntriesArraySerializer(MapSerializer<K, V> serializer) {
this.serializer = serializer;
this.keyEntryName = DEFAULT_KEY_ENTRY_NAME;
this.valueEntryName = DEFAULT_VALUE_ENTRY_NAME;
}
/**
* Write start of {@link Map} serialization.
* Opens {@code JsonArray} block.
*
* @param generator JSON format generator
*/
@Override
public void writeStart(JsonGenerator generator) {
generator.writeStartArray();
}
/**
* Write start of {@link Map} serialization.
* Opens {@code JsonArray} block.
*
* @param key JSON key name
* @param generator JSON format generator
*/
@Override
public void writeStart(String key, JsonGenerator generator) {
generator.writeStartArray();
}
/**
* Serialize content of provided {@link Map}.
* Content of provided {@link Map} is written into {@code JsonArray} of {@code JsonObject}s representing individual
* map entries.
*
* @param obj {@link Map} to be serialized
* @param generator JSON format generator
* @param ctx JSON serialization context
*/
@Override
public void serializeContainer(Map<K, V> obj, JsonGenerator generator, SerializationContext ctx) {
obj.forEach((key, value) -> {
generator.writeStartObject();
generator.writeKey(keyEntryName);
serializer.serializeItem(key, generator, ctx);
generator.writeKey(valueEntryName);
serializer.serializeItem(value, generator, ctx);
generator.writeEnd();
});
}
}