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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.commons.utils;
import com.itextpdf.commons.logs.CommonsLogMessageConstant;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonGenerator.Feature;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.core.util.DefaultIndenter;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility class for JSON serialization and deserialization operations. Not for public use.
*/
public final class JsonUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(JsonUtil.class);
private JsonUtil() {
// empty constructor
}
/**
* Compares two json strings without considering the order of the elements.
*
* @param expectedString expected json string
* @param toCompare string for comparison
*
* @return true if two json string are equals, false otherwise
*
* @throws IOException if an I/O error occurs
*/
public static boolean areTwoJsonObjectEquals(String expectedString, String toCompare) throws IOException {
final ObjectMapper mapper = new ObjectMapper();
JsonNode expectedObject = mapper.readTree(expectedString);
JsonNode actualObject = mapper.readTree(toCompare);
return actualObject.equals(expectedObject);
}
/**
* Serializes passed object to provided JSON output stream.
*
* @param outputStream stream to which the object will be serialized
* @param value the object which will be serialized
*/
public static void serializeToStream(OutputStream outputStream, Object value) {
serializeToStream(outputStream, value, new CustomPrettyPrinter());
}
/**
* Serializes passed object to JSON string.
*
* @param value the object which will be serialized
*
* @return the JSON string representation of passed object or {@code null} if it is impossible to serialize to JSON
*/
public static String serializeToString(Object value) {
return serializeToString(value, new CustomPrettyPrinter());
}
/**
* Serializes passed object to minimal JSON without spaces and line breaks and writes it into provided stream.
*
* @param outputStream stream to which the object will be serialized
* @param value the object which will be serialized
*/
public static void serializeToMinimalStream(OutputStream outputStream, Object value) {
serializeToStream(outputStream, value, new MinimalPrinter());
}
/**
* Serializes passed object to minimal JSON string without spaces and line breaks.
*
* @param value the object which will be serialized
*
* @return the minimal JSON string representation of passed object or {@code null} if it is impossible to
* serialize to JSON
*/
public static String serializeToMinimalString(Object value) {
return serializeToString(value, new MinimalPrinter());
}
/**
* Deserializes passed JSON stream to object with passed type.
*
* @param content the JSON stream which represent object
* @param objectType the class of object as {@link Class} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromStream(InputStream content, Class objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
return deserializeFromStream(content, objectMapper.constructType(objectType));
}
/**
* Deserializes passed JSON stream to object with passed type.
*
* @param content the JSON stream which represent object
* @param objectType the class of object as {@link TypeReference} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromStream(InputStream content, TypeReference objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
return deserializeFromStream(content, objectMapper.constructType(objectType));
}
/**
* Deserializes passed JSON stream to object with passed type.
*
* @param content the JSON stream which represent object
* @param objectType the class of object as {@link JavaType} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromStream(InputStream content, JavaType objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
try {
return objectMapper.readValue(content, objectType);
} catch (IOException ex) {
LOGGER.warn(MessageFormatUtil.format(
CommonsLogMessageConstant.UNABLE_TO_DESERIALIZE_JSON, ex.getClass(), ex.getMessage()));
return null;
}
}
/**
* Deserializes passed JSON string to object with passed type.
*
* @param content the JSON string which represent object
* @param objectType the class of object as {@link Class} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromString(String content, Class objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
return deserializeFromString(content, objectMapper.constructType(objectType));
}
/**
* Deserializes passed JSON string to object with passed type.
*
* @param content the JSON string which represent object
* @param objectType the class of object as {@link TypeReference} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromString(String content, TypeReference objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
return deserializeFromString(content, objectMapper.constructType(objectType));
}
/**
* Deserializes passed JSON string to object with passed type.
*
* @param content the JSON string which represent object
* @param objectType the class of object as {@link JavaType} which will be deserialized
* @param the type of object which will be deserialized
*
* @return the deserialized object or {@code null} if operation of deserialization is impossible
*/
public static T deserializeFromString(String content, JavaType objectType) {
final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
try {
return objectMapper.readValue(content, objectType);
} catch (JsonProcessingException ex) {
LOGGER.warn(MessageFormatUtil.format(
CommonsLogMessageConstant.UNABLE_TO_DESERIALIZE_JSON, ex.getClass(), ex.getMessage()));
return null;
}
}
/**
* Creates and configure object writer with given {@link DefaultPrettyPrinter}.
*
* @param prettyPrinter specified pretty printer for indentation
*
* @return configured object writer
*/
private static ObjectWriter createAndConfigureObjectWriter(DefaultPrettyPrinter prettyPrinter) {
final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
// Don't serialize null fields
objectMapper.setSerializationInclusion(Include.NON_NULL);
objectMapper.disable(Feature.AUTO_CLOSE_TARGET);
return objectMapper.writer(prettyPrinter);
}
/**
* Serializes passed object to provided JSON output stream.
*
* @param outputStream stream to which the object will be serialized
* @param value the object which will be serialized
* @param prettyPrinter specified pretty printer for indentation
*/
private static void serializeToStream(OutputStream outputStream, Object value,
DefaultPrettyPrinter prettyPrinter) {
try {
createAndConfigureObjectWriter(prettyPrinter).writeValue(outputStream, value);
} catch (IOException ex) {
LOGGER.warn(MessageFormatUtil.format(
CommonsLogMessageConstant.UNABLE_TO_SERIALIZE_OBJECT, ex.getClass(), ex.getMessage()));
}
}
/**
* Serializes passed object to JSON string.
*
* @param value the object which will be serialized
* @param prettyPrinter specified pretty printer for indentation
*
* @return the JSON string representation of passed object or {@code null} if it is impossible to serialize to JSON
*/
private static String serializeToString(Object value, DefaultPrettyPrinter prettyPrinter) {
try {
return createAndConfigureObjectWriter(prettyPrinter).writeValueAsString(value);
} catch (JsonProcessingException ex) {
LOGGER.warn(MessageFormatUtil.format(
CommonsLogMessageConstant.UNABLE_TO_SERIALIZE_OBJECT, ex.getClass(), ex.getMessage()));
return null;
}
}
/**
* This class is used to define a custom separator and array
* indent to achieve the same serialization in Java and .NET.
*/
private static class CustomPrettyPrinter extends DefaultPrettyPrinter {
public CustomPrettyPrinter() {
_objectFieldValueSeparatorWithSpaces = ": ";
indentArraysWith(DefaultIndenter.SYSTEM_LINEFEED_INSTANCE.withLinefeed("\n"));
indentObjectsWith(DefaultIndenter.SYSTEM_LINEFEED_INSTANCE.withLinefeed("\n"));
}
@Override
public DefaultPrettyPrinter createInstance() {
return new CustomPrettyPrinter();
}
}
/**
* This class is used to define a printer which serialize to
* minimal string, without extra spaces and line breaks.
*/
private static class MinimalPrinter extends DefaultPrettyPrinter {
public MinimalPrinter() {
_objectFieldValueSeparatorWithSpaces = ":";
indentArraysWith(new DefaultIndenter("", ""));
indentObjectsWith(new DefaultIndenter("", ""));
}
@Override
public DefaultPrettyPrinter createInstance() {
return new MinimalPrinter();
}
}
}
