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JsonDataImpl.java
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JsonDataImpl.java
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/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package co.elastic.clients.json;
import jakarta.json.JsonValue;
import jakarta.json.stream.JsonGenerator;
import jakarta.json.stream.JsonParser;
import java.io.StringReader;
import java.io.StringWriter;
import java.lang.reflect.Type;
class JsonDataImpl implements JsonData {
private final Object value;
private final JsonpMapper mapper;
JsonDataImpl(Object value, JsonpMapper mapper) {
this.value = value;
this.mapper = mapper;
}
@Override
public String toString() {
return value.toString();
}
@Override
public JsonValue toJson() {
return toJson(null);
}
@Override
public JsonValue toJson(JsonpMapper mapper) {
if (value instanceof JsonValue) {
return (JsonValue) value;
}
// Provided mapper has precedence over the one that was optionally set at creation time
mapper = mapper != null ? mapper : this.mapper;
if (mapper == null) {
throw new IllegalStateException("Contains a '" + value.getClass().getName() +
"' that cannot be converted to a JsonValue without a mapper");
}
final JsonParser parser = getParser(mapper);
parser.next(); // move to first event
return parser.getValue();
}
@Override
public <T> T to(Class<T> clazz) {
return to((Type)clazz, null);
}
@Override
public <T> T to(Type clazz) {
return to(clazz, null);
}
@Override
public <T> T to(Class<T> clazz, JsonpMapper mapper) {
return to((Type)clazz, mapper);
}
@Override
public <T> T to(Type type, JsonpMapper mapper) {
if (type instanceof Class<?> && ((Class<?>)type).isAssignableFrom(value.getClass())) {
@SuppressWarnings("unchecked")
T result = (T) value;
return result;
}
mapper = getMapper(mapper);
JsonParser parser = getParser(mapper);
return mapper.deserialize(parser, type);
}
@Override
public <T> T deserialize(JsonpDeserializer<T> deserializer) {
return deserialize(deserializer, null);
}
@Override
public <T> T deserialize(JsonpDeserializer<T> deserializer, JsonpMapper mapper) {
mapper = getMapper(mapper);
return deserializer.deserialize(getParser(mapper), mapper);
}
@Override
public void serialize(JsonGenerator generator, JsonpMapper mapper) {
if (value instanceof JsonValue) {
generator.write((JsonValue) value);
} else if (this.mapper == null) {
mapper.serialize(value, generator);
} else if (this.mapper.getClass() != mapper.getClass()) {
// Workaround for https://github.com/elastic/elasticsearch-java/issues/424
// Mappers can require generators to have been created by them (see JacksonJsonpMapper), so use the mapper
// parameter if its class is different from the one passed at construction time.
mapper.serialize(value, generator);
} else {
this.mapper.serialize(value, generator);
}
}
private JsonpMapper getMapper(JsonpMapper localMapper) {
// Local mapper has precedence over the one provided at creation time
localMapper = localMapper != null ? localMapper : this.mapper;
if (localMapper == null) {
throw new IllegalStateException("A JsonpMapper is needed to convert JsonData");
}
return localMapper;
}
private JsonParser getParser(JsonpMapper mapper) {
// FIXME: inefficient roundtrip through a string. Should be replaced by an Event buffer structure.
StringWriter sw = new StringWriter();
JsonGenerator generator = mapper.jsonProvider().createGenerator(sw);
if (value instanceof JsonValue) {
generator.write((JsonValue) value);
} else {
mapper.serialize(value, generator);
}
generator.close();
return mapper.jsonProvider().createParser(new StringReader(sw.toString()));
}
}