io.inversion.json.JSWriter Maven / Gradle / Ivy
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package io.inversion.json;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import io.inversion.utils.Utils;
import java.io.ByteArrayOutputStream;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.IdentityHashMap;
public class JSWriter {
// public static String toJson(Object obj){
// if(obj instanceof JSNode){
// return toJson((JSNode)obj);
// }
// try{
// return JSNode.mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
// }
// catch(Exception ex){
// if(ex instanceof RuntimeException)
// throw ((RuntimeException)ex);
// throw new RuntimeException("Error writing json: " + ex.getMessage(), ex);
// }
// }
public static String toJson(Object object, boolean pretty){
try {
if (pretty)
return JSParser.objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(object);
return JSParser.objectMapper.writeValueAsString(object);
}
catch(Exception ex){
Utils.rethrow(ex);
return null;
}
}
static String toJson(JSNode node){
return toJson(node, true, false);
}
static String toJson(JSNode node, boolean pretty, boolean lowercasePropertyNames) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
JsonGenerator json = new JsonFactory().createGenerator(baos);
if (pretty)
json.useDefaultPrettyPrinter();
private_writeObject(node, json, new IdentityHashMap<>(), lowercasePropertyNames, "#");
json.flush();
baos.flush();
return new String(baos.toByteArray());
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
static void private_writeObject(JSNode object, JsonGenerator json, IdentityHashMap visited, boolean lowercaseNames, String path) throws Exception {
if (visited.containsKey(object)) {
json.writeStartObject();
json.writeStringField("$ref", visited.get(object));
json.writeEndObject();
return;
}
visited.put(object, path);
if (object.isList()) {
private_writeArrayNode(((JSList) object), json, visited, lowercaseNames, path);
return;
}
json.writeStartObject();
for (String key : object.keySet()) {
Object value = object.get(key);
String name = lowercaseNames ? key.toLowerCase() : key;
if (value == null) {
json.writeNullField(name);
} else if (value instanceof JSNode) {
json.writeFieldName(name);
private_writeObject((JSNode) value, json, visited, lowercaseNames, path + "/" + name);
} else if (value instanceof String) {
if (value.equals("null"))
json.writeNullField(name);
else
json.writeStringField(name, (String) value);
} else if (value instanceof Boolean) {
json.writeBooleanField(name, (Boolean) value);
} else if (value instanceof Integer) {
json.writeNumberField(name, (Integer) value);
} else if (value instanceof Long) {
json.writeNumberField(name, (Long) value);
} else if (value instanceof Float) {
json.writeNumberField(name, (Float) value);
} else if (value instanceof Double) {
json.writeNumberField(name, (Double) value);
} else if (value instanceof BigInteger) {
json.writeNumberField(name, ((BigInteger) value).intValue());
} else if (value instanceof BigDecimal) {
json.writeNumberField(name, (BigDecimal) value);
} else if (value instanceof Date) {
String dateFormat = "yyyy-MM-dd'T'HH:mmZ";
SimpleDateFormat f = new SimpleDateFormat(dateFormat);
String dateString = f.format((Date) value);
json.writeStringField(name, dateString);
} else {
String strVal = value + "";
if ("null".equals(strVal)) {
json.writeNullField(name);
} else {
strVal = encodeStringValue(strVal);
json.writeStringField(name, strVal);
}
}
}
json.writeEndObject();
}
static void private_writeArrayNode(JSList array, JsonGenerator json, IdentityHashMap visited, boolean lowercaseNames, String path) throws Exception {
json.writeStartArray();
for (int i = 0; i < array.size(); i++) {
Object value = array.get(i);
if (value == null) {
json.writeNull();
} else if (value instanceof JSNode) {
private_writeObject((JSNode) value, json, visited, lowercaseNames, path + "/" + i );
} else {
if (value instanceof String) {
if (value.equals("null"))
json.writeNull();
else
json.writeString(value.toString());
} else if (value instanceof Boolean) {
json.writeBoolean((Boolean) value);
} else if (value instanceof Integer) {
json.writeNumber((Integer) value);
} else if (value instanceof Long) {
json.writeNumber((Long) value);
} else if (value instanceof Float) {
json.writeNumber((Float) value);
} else if (value instanceof Double) {
json.writeNumber((Double) value);
} else if (value instanceof BigInteger) {
json.writeNumber((BigInteger) value);
} else if (value instanceof BigDecimal) {
json.writeNumber((BigDecimal) value);
} else if (value instanceof Date) {
String dateFormat = "yyyy-MM-dd'T'HH:mmZ";
SimpleDateFormat f = new SimpleDateFormat(dateFormat);
String dateString = f.format((Date) value);
json.writeString(dateString);
} else {
json.writeString(encodeStringValue(value.toString()));
}
}
}
json.writeEndArray();
}
/**
* Replaces JSON control characters with spaces.
*
* @param str the string to encode
* @return str with control characters replaced with spaces
* @see How to remove control characters from java Strings
*/
public static String encodeStringValue(String str) {
if (str == null)
return null;
str = str.replaceAll("[\\p{Cntrl}\\p{Cc}\\p{Cf}\\p{Co}\\p{Cn}\u00A0&&[^\r\n\t]]", " ");
return str;
}
}