| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.metron.common.utils; |
| |
| import com.fasterxml.jackson.annotation.JsonInclude; |
| import com.fasterxml.jackson.core.JsonParser; |
| import com.fasterxml.jackson.core.JsonProcessingException; |
| import com.fasterxml.jackson.core.type.TypeReference; |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.flipkart.zjsonpatch.JsonPatch; |
| import org.json.simple.JSONObject; |
| import org.json.simple.parser.JSONParser; |
| import org.json.simple.parser.ParseException; |
| |
| import java.io.BufferedInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.Supplier; |
| |
| public enum JSONUtils { |
| INSTANCE; |
| |
| public static class ReferenceSupplier<T> implements Supplier<TypeReference<T>> { |
| Type type; |
| protected ReferenceSupplier() { |
| Type superClass = this.getClass().getGenericSuperclass(); |
| if(superClass instanceof Class) { |
| throw new IllegalArgumentException("Internal error: ReferenceSupplier constructed without actual type information"); |
| } else { |
| this.type = ((ParameterizedType)superClass).getActualTypeArguments()[0]; |
| } |
| } |
| |
| @Override |
| public TypeReference<T> get() { |
| return new TypeReference<T>() { |
| @Override |
| public Type getType() { |
| return type; |
| } |
| }; |
| } |
| } |
| |
| public final static ReferenceSupplier<Map<String, Object>> MAP_SUPPLIER = new ReferenceSupplier<Map<String, Object>>() {}; |
| public final static ReferenceSupplier<List<Object>> LIST_SUPPLIER = new ReferenceSupplier<List<Object>>(){}; |
| |
| private static ThreadLocal<JSONParser> _parser = ThreadLocal.withInitial(() -> |
| new JSONParser()); |
| |
| private static ThreadLocal<ObjectMapper> _mapper = ThreadLocal.withInitial(() -> |
| new ObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_NULL) |
| .configure(JsonParser.Feature.ALLOW_COMMENTS, true)); |
| |
| public <T> T convert(Object original, Class<T> targetClass) { |
| return _mapper.get().convertValue(original, targetClass); |
| } |
| |
| public ObjectMapper getMapper() { |
| return _mapper.get(); |
| } |
| |
| |
| public <T> T load(InputStream is, ReferenceSupplier<T> ref) throws IOException { |
| return _mapper.get().readValue(is, (TypeReference<T>)ref.get()); |
| } |
| |
| public <T> T load(String is, ReferenceSupplier<T> ref) throws IOException { |
| return _mapper.get().readValue(is, (TypeReference<T>)ref.get()); |
| } |
| |
| /** |
| * Loads JSON from a file and ensures it's located in the specified class. |
| * |
| * @param f The file to read from |
| * @param ref A {@link ReferenceSupplier} for the class to be loaded into. |
| * @param <T> The type parameter of the class |
| * @return The JSON loaded into the provided class |
| * @throws IOException If there's an issue loading the JSON |
| */ |
| public <T> T load(File f, ReferenceSupplier<T> ref) throws IOException { |
| try (InputStream is = new BufferedInputStream(new FileInputStream(f))) { |
| return _mapper.get().readValue(is, (TypeReference<T>)ref.get()); |
| } |
| } |
| |
| public <T> T load(InputStream is, Class<T> clazz) throws IOException { |
| return _mapper.get().readValue(is, clazz); |
| } |
| |
| /** |
| * Loads JSON from a file and ensures it's located in the provided class. |
| * |
| * @param f The file to read from |
| * @param clazz The class to read into |
| * @param <T> The type parameter of the class |
| * @return The JSON loaded into the provided class |
| * @throws IOException If there's an issue loading the JSON |
| */ |
| public <T> T load(File f, Class<T> clazz) throws IOException { |
| try (InputStream is = new BufferedInputStream(new FileInputStream(f))) { |
| return _mapper.get().readValue(is, clazz); |
| } |
| } |
| |
| public <T> T load(String is, Class<T> clazz) throws IOException { |
| return _mapper.get().readValue(is, clazz); |
| } |
| |
| /** |
| * Converts an object to a JSON string. Can be a pretty string |
| * |
| * @param o The object to convert |
| * @param pretty Pretty formatted string if true, otherwise not pretty formatted. |
| * @return A JSON string representation of the object |
| * @throws JsonProcessingException If there's an issue converting to JSON. |
| */ |
| public String toJSON(Object o, boolean pretty) throws JsonProcessingException { |
| if (pretty) { |
| return _mapper.get().writerWithDefaultPrettyPrinter().writeValueAsString(o); |
| } else { |
| return _mapper.get().writeValueAsString(o); |
| } |
| } |
| |
| public byte[] toJSONPretty(String config) throws IOException { |
| return toJSONPretty(readTree(config)); |
| } |
| |
| public byte[] toJSONPretty(Object config) throws JsonProcessingException { |
| return _mapper.get().writerWithDefaultPrettyPrinter().writeValueAsBytes(config); |
| } |
| |
| /** |
| * Transforms a bean (aka POJO) to a JSONObject. |
| */ |
| public JSONObject toJSONObject(Object o) throws JsonProcessingException, ParseException { |
| return (JSONObject) _parser.get().parse(toJSON(o, false)); |
| } |
| |
| /** |
| * Reads a JSON string into a JsonNode Object. |
| * |
| * @param json JSON value to deserialize |
| * @return deserialized JsonNode Object |
| */ |
| JsonNode readTree(String json) throws IOException { |
| return _mapper.get().readTree(json); |
| } |
| |
| /** |
| * Reads a JSON byte array into a JsonNode Object. |
| * |
| * @param json JSON value to deserialize |
| * @return deserialized JsonNode Object |
| */ |
| JsonNode readTree(byte[] json) throws IOException { |
| return _mapper.get().readTree(json); |
| } |
| |
| /** |
| * Update JSON given a JSON Patch (see RFC 6902 at https://tools.ietf.org/html/rfc6902) |
| * Operations: |
| * <ul> |
| * <li>add</li> |
| * <li>remove</li> |
| * <li>replace</li> |
| * <li>move</li> |
| * <li>copy</li> |
| * <li>test</li> |
| * </ul> |
| * |
| * @param patch Array of JSON patches, e.g. [{ "op": "move", "from": "/a", "path": "/c" }] |
| * @param source Source JSON to apply patch to |
| * @return new json after applying the patch |
| */ |
| public byte[] applyPatch(String patch, String source) throws IOException { |
| JsonNode patchNode = readTree(patch); |
| JsonNode sourceNode = readTree(source); |
| return toJSONPretty(JsonPatch.apply(patchNode, sourceNode)); |
| } |
| |
| /** |
| * Update JSON given a JSON Patch (see RFC 6902 at https://tools.ietf.org/html/rfc6902) |
| * |
| * @param patch Array of JSON patches in raw bytes |
| * @param source Source JSON in raw bytes to apply patch to |
| * @return new json after applying the patch |
| * |
| * @see JSONUtils#applyPatch(String, String) |
| */ |
| public byte[] applyPatch(byte[] patch, byte[] source) throws IOException { |
| JsonNode patchNode = readTree(patch); |
| JsonNode sourceNode = readTree(source); |
| return toJSONPretty(JsonPatch.apply(patchNode, sourceNode)); |
| } |
| |
| |
| /** |
| * Update JSON given a JSON Patch (see RFC 6902 at https://tools.ietf.org/html/rfc6902) |
| * |
| * @param patch List of JSON patches in map form |
| * @param source Source JSON in map form to apply patch to |
| * @return new json after applying the patch |
| * |
| * @see JSONUtils#applyPatch(String, String) |
| */ |
| public Map<String, Object> applyPatch(List<Map<String, Object>> patch, Map<String, Object> source) { |
| JsonNode originalNode = convert(source, JsonNode.class); |
| JsonNode patchNode = convert(patch, JsonNode.class); |
| JsonNode patched = JsonPatch.apply(patchNode, originalNode); |
| return _mapper.get().convertValue(patched, new TypeReference<Map<String, Object>>() { }); |
| } |
| |
| } |