JsonNodeUtils.java

/*
 * Copyright 2004-present the original author or 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
 *
 *      https://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 org.springframework.security.oauth2.client.jackson;

import java.util.Map;
import java.util.Set;

import tools.jackson.core.type.TypeReference;
import tools.jackson.databind.DeserializationContext;
import tools.jackson.databind.JsonNode;

/**
 * Utility class for {@code JsonNode}.
 *
 * @author Sebastien Deleuze
 * @author Joe Grandja
 * @since 7.0
 */
abstract class JsonNodeUtils {

	static final TypeReference<Set<String>> STRING_SET = new TypeReference<>() {
	};

	static final TypeReference<Map<String, Object>> STRING_OBJECT_MAP = new TypeReference<>() {
	};

	static String findStringValue(JsonNode jsonNode, String fieldName) {
		if (jsonNode == null) {
			return null;
		}
		JsonNode value = jsonNode.findValue(fieldName);
		return (value != null && value.isString()) ? value.stringValue() : null;
	}

	static <T> T findValue(JsonNode jsonNode, String fieldName, TypeReference<T> valueTypeReference,
			DeserializationContext context) {
		if (jsonNode == null) {
			return null;
		}
		JsonNode value = jsonNode.findValue(fieldName);
		return (value != null && value.isContainer())
				? context.readTreeAsValue(value, context.getTypeFactory().constructType(valueTypeReference)) : null;
	}

	static JsonNode findObjectNode(JsonNode jsonNode, String fieldName) {
		if (jsonNode == null) {
			return null;
		}
		JsonNode value = jsonNode.findValue(fieldName);
		return (value != null && value.isObject()) ? value : null;
	}

}