com.stratio.cassandra.lucene.util.JsonSerializer Maven / Gradle / Ivy
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* Licensed to STRATIO (C) under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. The STRATIO (C) 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 com.stratio.cassandra.lucene.util;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import java.io.IOException;
/**
* A JSON mapper based on Codehaus {@link ObjectMapper} annotations.
*
* @author Andres de la Pena {@literal }
*/
public final class JsonSerializer {
private static final JsonSerializer INSTANCE = new JsonSerializer();
/** The embedded JSON serializer. */
private final ObjectMapper jsonMapper = new ObjectMapper();
/** Private constructor to hide the implicit public one. */
private JsonSerializer() {
jsonMapper.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, false);
jsonMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
jsonMapper.configure(SerializationConfig.Feature.AUTO_DETECT_IS_GETTERS, false);
jsonMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
jsonMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
}
/**
* Returns the JSON {@code String} representation of the specified object.
*
* @param value A object to be serialized.
* @return The JSON {@code String} representation of the specified object.
* @throws IOException If there are serialization problems.
*/
public static String toString(Object value) throws IOException {
return INSTANCE.jsonMapper.writeValueAsString(value);
}
/**
* Returns the object of the specified class represented by the specified JSON {@code String}.
*
* @param value A JSON {@code String} to be parsed.
* @param valueType The class of the object to be parsed.
* @param The type of the object to be parsed.
* @return The object of the specified class represented by the specified JSON {@code String}.
* @throws IOException If there are parsing problems.
*/
public static T fromString(String value, Class valueType) throws IOException {
return INSTANCE.jsonMapper.readValue(value, valueType);
}
}