org.springframework.boot.json.JacksonJsonParser.java Source code

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Here is the source code for org.springframework.boot.json.JacksonJsonParser.java

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/*
 * Copyright 2012-2019 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.boot.json;

import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Thin wrapper to adapt Jackson 2 {@link ObjectMapper} to {@link JsonParser}.
 *
 * @author Dave Syer
 * @since 1.0.0
 * @see JsonParserFactory
 */
public class JacksonJsonParser extends AbstractJsonParser {

    private static final TypeReference<?> MAP_TYPE = new MapTypeReference();

    private static final TypeReference<?> LIST_TYPE = new ListTypeReference();

    private ObjectMapper objectMapper; // Late binding

    /**
     * Creates an instance with the specified {@link ObjectMapper}.
     * @param objectMapper the object mapper to use
     */
    public JacksonJsonParser(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    /**
     * Creates an instance with a default {@link ObjectMapper} that is created lazily.
     */
    public JacksonJsonParser() {
    }

    @Override
    public Map<String, Object> parseMap(String json) {
        return tryParse(() -> getObjectMapper().readValue(json, MAP_TYPE), Exception.class);
    }

    @Override
    public List<Object> parseList(String json) {
        return tryParse(() -> getObjectMapper().readValue(json, LIST_TYPE), Exception.class);
    }

    private ObjectMapper getObjectMapper() {
        if (this.objectMapper == null) {
            this.objectMapper = new ObjectMapper();
        }
        return this.objectMapper;
    }

    private static class MapTypeReference extends TypeReference<Map<String, Object>> {

    }

    private static class ListTypeReference extends TypeReference<List<Object>> {

    }

}