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The Ionic Java SDK provides an easy-to-use interface to the Ionic Platform.
package com.ionic.sdk.json;
import com.ionic.sdk.core.codec.Transcoder;
import com.ionic.sdk.error.IonicException;
import com.ionic.sdk.error.SdkError;
import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerator;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.StringReader;
import java.util.Map;
import java.util.TreeMap;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utility methods for serialization / deserialization of json messages using the javax.json library.
*/
public final class JsonIO {
/**
* Constructor.
* http://checkstyle.sourceforge.net/config_design.html#FinalClass
*/
private JsonIO() {
}
/**
* A helper function that converts a byte array into a JsonObject. The byte array is assumed to be a
* string encoded using the UTF-8 encoding.
*
* @param jsonStream a byte stream that can be parsed into a JsonObject
* @return the JsonObject representation of the input string
* @throws IonicException on failure parsing the input json
*/
public static JsonObject readObject(final InputStream jsonStream) throws IonicException {
try (JsonReader jsonReader = Json.createReader(jsonStream)) {
return jsonReader.readObject();
} catch (JsonException e) {
throw new IonicException(SdkError.ISAGENT_PARSEFAILED, e);
}
}
/**
* A helper function that converts a byte array into a JsonObject. The byte array is assumed to be a
* string encoded using the UTF-8 encoding.
*
* @param jsonBytes a byte array that can be parsed into a JsonObject
* @return the JsonObject representation of the input string
* @throws IonicException on failure parsing the input json
*/
public static JsonObject readObject(final byte[] jsonBytes) throws IonicException {
return readObjectInternal(jsonBytes, null);
}
/**
* A helper function that converts a byte array into a JsonObject. The byte array is assumed to be a
* string encoded using the UTF-8 encoding.
*
* @param jsonBytes a byte array that can be parsed into a JsonObject
* @param level the level at which JsonException should be logged, if encountered
* @return the JsonObject representation of the input string
* @throws IonicException on failure parsing the input json
*/
public static JsonObject readObject(final byte[] jsonBytes, final Level level) throws IonicException {
return readObjectInternal(jsonBytes, level);
}
/**
* A helper function that converts a byte array into a JsonObject. The byte array is assumed to be a
* string encoded using the UTF-8 encoding.
*
* @param jsonBytes a byte array that can be parsed into a JsonObject
* @param level the level at which JsonException should be logged, if encountered
* @return the JsonObject representation of the input string
* @throws IonicException on failure parsing the input json
*/
private static JsonObject readObjectInternal(final byte[] jsonBytes, final Level level) throws IonicException {
try (JsonReader jsonReader = Json.createReader(new ByteArrayInputStream(jsonBytes))) {
return jsonReader.readObject();
} catch (JsonException e) {
handleJsonException(Transcoder.utf8().encode(jsonBytes), level, e);
throw new IonicException(SdkError.ISAGENT_PARSEFAILED, e);
}
}
/**
* A helper function that converts a string into a JsonObject.
*
* @param jsonString a string that can be parsed into a JsonObject
* @param errorCode the error code to return on parse failure
* @return the JsonObject representation of the input string
* @throws IonicException on failure parsing the input json
*/
public static JsonObject readObject(final String jsonString, final int errorCode) throws IonicException {
try (JsonReader jsonReader = Json.createReader(new StringReader(jsonString))) {
return jsonReader.readObject();
} catch (JsonException e) {
throw new IonicException(errorCode, e);
}
}
/**
* A helper function that converts a string into a JsonArray.
*
* @param jsonString a string that can be parsed into a JsonArray
* @return the JsonArray representation of the input string
* @throws IonicException on failure parsing the input json
*/
public static JsonArray readArray(final String jsonString) throws IonicException {
try (JsonReader jsonReader = Json.createReader(new StringReader(jsonString))) {
return jsonReader.readArray();
} catch (JsonException e) {
throw new IonicException(SdkError.ISAGENT_PARSEFAILED, e);
}
}
/**
* On JsonException, conditionally log exception detail.
*
* @param message text to include in log message
* @param level the level at which JsonException should be logged
* @param e exception to be wrapped
*/
private static void handleJsonException(final String message, final Level level, final JsonException e) {
if (level != null) {
Logger.getLogger(JsonIO.class.getName()).log(level, message, e);
}
}
/**
* This is how we can serialize javax.json objects.
*
* @param jsonObject the container for the source json data
* @param pretty a flag indicating whether the json should be emitted in a human-readable format
* @return a human readable representation of the source data
*/
public static String write(final JsonObject jsonObject, final boolean pretty) {
final ByteArrayOutputStream os = new ByteArrayOutputStream();
final Map config = new TreeMap();
if (pretty) {
config.put(JsonGenerator.PRETTY_PRINTING, Boolean.TRUE);
}
final JsonWriterFactory writerFactory = javax.json.Json.createWriterFactory(config);
try (JsonWriter writer = writerFactory.createWriter(os)) {
writer.writeObject(jsonObject);
}
return Transcoder.utf8().encode(os.toByteArray());
}
/**
* This is how we can serialize javax.json objects.
*
* @param jsonArray the container for the source json data
* @param pretty a flag indicating whether the json should be emitted in a human-readable format
* @return a human readable representation of the source data
*/
public static String write(final JsonArray jsonArray, final boolean pretty) {
final ByteArrayOutputStream os = new ByteArrayOutputStream();
final Map config = new TreeMap();
if (pretty) {
config.put(JsonGenerator.PRETTY_PRINTING, Boolean.TRUE);
}
final JsonWriterFactory writerFactory = javax.json.Json.createWriterFactory(config);
try (JsonWriter writer = writerFactory.createWriter(os)) {
writer.writeArray(jsonArray);
}
return Transcoder.utf8().encode(os.toByteArray());
}
}