package ch.inftec.ju.json;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectWriter;
import org.codehaus.jackson.map.SerializationConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.inftec.ju.util.JuRuntimeException;
/**
* Utility class containing JSON related helper methods.
* @author Martin Meyer <martin.meyer@inftec.ch>
*
*/
public class JsonUtils {
private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);
/**
* Formats (pretty prints) the specified JSON String.
* @param json JSON String
* @return JSON String with indentations and line breaks
*/
public static String formatJson(String json) {
try {
ObjectMapper mapper = new ObjectMapper();
Object obj = new ObjectMapper().readValue(json, Object.class);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
} catch (Exception ex) {
if (logger.isDebugEnabled()) {
logger.debug("JSON String: " + json);
}
throw new JuRuntimeException("Couldn't format JSON (see debug log for JSON String)", ex);
}
}
/**
* Returns a new MarshallerBuilder to convert Java Objects to JSON and vice versa.
* @return MarshallerBuilder
*/
public static MarshallerBuilder marshaller() {
return new MarshallerBuilder();
}
public static final class MarshallerBuilder {
private boolean formattedOutput = false;
/**
* Whether to produce formatted output.
* <p>
* Default is false.
* @param formattedOutput If true, JSON output will be formatted / indented.
* @return
*/
public MarshallerBuilder formattedOutput(boolean formattedOutput) {
this.formattedOutput = formattedOutput;
return this;
}
/**
* Marshalls the specified object to a JSON String.
* <p>
* This will order the properties of the object alphabetically to produce
* repeatable output.
* @param obj Object to be marshalled
* @return JSON representation of the object
*/
public String marshalToString(Object obj) {
try {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationConfig.Feature.SORT_PROPERTIES_ALPHABETICALLY, true);
ObjectWriter writer = this.formattedOutput
? mapper.writerWithDefaultPrettyPrinter()
: mapper.writer();
return writer.writeValueAsString(obj);
} catch (Exception ex) {
throw new JuRuntimeException("Marshalling of object to JSON failed", ex);
}
}
}
}