io.micronaut.jackson.convert.ObjectNodeConvertibleValues Maven / Gradle / Ivy
/*
* Copyright 2017-2019 original authors
*
* Licensed 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 io.micronaut.jackson.convert;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.convert.value.ConvertibleValues;
import io.micronaut.core.util.CollectionUtils;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.Set;
/**
* Simple facade over a Jackson {@link ObjectNode} to make it a {@link ConvertibleValues}.
*
* @param The generic type for values
*
* @author Graeme Rocher
* @since 1.0
*/
public class ObjectNodeConvertibleValues implements ConvertibleValues {
private final ObjectNode objectNode;
private final ConversionService conversionService;
/**
* @param objectNode The node that maps to JSON object structure
* @param conversionService To convert the JSON node into given type
*/
public ObjectNodeConvertibleValues(ObjectNode objectNode, ConversionService conversionService) {
this.objectNode = objectNode;
this.conversionService = conversionService;
}
@Override
public Set names() {
Iterator fieldNames = objectNode.fieldNames();
return CollectionUtils.iteratorToSet(fieldNames);
}
@Override
public Collection values() {
List values = new ArrayList<>();
for (JsonNode jsonNode : objectNode) {
values.add((V) jsonNode);
}
return Collections.unmodifiableCollection(values);
}
@Override
public Optional get(CharSequence name, ArgumentConversionContext conversionContext) {
String fieldName = name.toString();
JsonNode jsonNode = objectNode.get(fieldName);
if (jsonNode == null) {
return Optional.empty();
} else {
return conversionService.convert(jsonNode, conversionContext);
}
}
}