1 package com.fasterxml.jackson.databind.node; 2 3 import java.io.IOException; 4 5 import com.fasterxml.jackson.databind.JsonNode; 6 import com.fasterxml.jackson.databind.ObjectReader; 7 import com.fasterxml.jackson.databind.ObjectWriter; 8 import com.fasterxml.jackson.databind.json.JsonMapper; 9 10 /** 11 * Helper class used to implement <code>toString()</code> method for 12 * {@link BaseJsonNode}, by embedding a private instance of 13 * {@link JsonMapper}, only to be used for node serialization. 14 * 15 * @since 2.10 (but not to be included in 3.0) 16 */ 17 final class InternalNodeMapper { 18 private final static JsonMapper JSON_MAPPER = new JsonMapper(); 19 20 private final static ObjectWriter STD_WRITER = JSON_MAPPER.writer(); 21 private final static ObjectWriter PRETTY_WRITER = JSON_MAPPER.writer() 22 .withDefaultPrettyPrinter(); 23 24 private final static ObjectReader NODE_READER = JSON_MAPPER.readerFor(JsonNode.class); 25 26 // // // Methods for `JsonNode.toString()` and `JsonNode.toPrettyString()` 27 nodeToString(JsonNode n)28 public static String nodeToString(JsonNode n) { 29 try { 30 return STD_WRITER.writeValueAsString(n); 31 } catch (IOException e) { // should never occur 32 throw new RuntimeException(e); 33 } 34 } 35 nodeToPrettyString(JsonNode n)36 public static String nodeToPrettyString(JsonNode n) { 37 try { 38 return PRETTY_WRITER.writeValueAsString(n); 39 } catch (IOException e) { // should never occur 40 throw new RuntimeException(e); 41 } 42 } 43 44 // // // Methods for JDK serialization support of JsonNodes 45 valueToBytes(Object value)46 public static byte[] valueToBytes(Object value) throws IOException { 47 return JSON_MAPPER.writeValueAsBytes(value); 48 } 49 bytesToNode(byte[] json)50 public static JsonNode bytesToNode(byte[] json) throws IOException { 51 return NODE_READER.readValue(json); 52 } 53 } 54