| /* |
| * 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 |
| * |
| * 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.streams.util; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| import com.fasterxml.jackson.databind.node.JsonNodeType; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import com.fasterxml.jackson.databind.node.ValueNode; |
| import com.github.wnameless.json.flattener.JsonFlattener; |
| import com.github.wnameless.json.unflattener.JsonUnflattener; |
| import org.apache.commons.lang3.StringUtils; |
| import com.fasterxml.jackson.core.JsonFactory; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Class transforms nested properties of activities, actors, objects, etc... |
| */ |
| public class PropertyUtil { |
| |
| private static final PropertyUtil INSTANCE = new PropertyUtil(new ObjectMapper()); |
| |
| public static PropertyUtil getInstance() { |
| return INSTANCE; |
| } |
| |
| public static PropertyUtil getInstance(ObjectMapper mapper) { |
| return new PropertyUtil(mapper); |
| } |
| |
| private ObjectMapper mapper; |
| |
| public PropertyUtil(ObjectMapper mapper) { |
| this.mapper = mapper; |
| } |
| |
| public Map<String, Object> flattenToMap(ObjectNode object) { |
| return flattenToMap(mapper, object); |
| } |
| |
| public ObjectNode flattenToObjectNode(ObjectNode object) { |
| return flattenToObjectNode(mapper, object); |
| } |
| |
| public ObjectNode unflattenMap(Map<String, Object> object) { |
| return unflattenMap(mapper, object); |
| } |
| |
| public ObjectNode unflattenObjectNode(ObjectNode object) { |
| return unflattenObjectNode(mapper, object); |
| } |
| |
| public static Map<String, Object> flattenToMap(ObjectMapper mapper, ObjectNode object) { |
| Map<String, Object> flatObject; |
| try { |
| flatObject = mapper.readValue(JsonFlattener.flatten(mapper.writeValueAsString(object)), Map.class); |
| } catch( Exception ex ) { |
| return null; |
| } |
| return flatObject; |
| } |
| |
| public static ObjectNode flattenToObjectNode(ObjectMapper mapper, ObjectNode object) { |
| ObjectNode flatObjectNode; |
| try { |
| flatObjectNode = mapper.readValue(JsonFlattener.flatten(mapper.writeValueAsString(object)), ObjectNode.class); |
| } catch( Exception ex ) { |
| return null; |
| } |
| return flatObjectNode; |
| } |
| |
| public static ObjectNode unflattenMap(ObjectMapper mapper, Map<String, Object> object) { |
| ObjectNode unflatObjectNode; |
| try { |
| unflatObjectNode = mapper.readValue(JsonUnflattener.unflatten(mapper.writeValueAsString(object)), ObjectNode.class); |
| } catch( Exception ex ) { |
| return null; |
| } |
| return unflatObjectNode; |
| } |
| |
| public static ObjectNode unflattenObjectNode(ObjectMapper mapper, ObjectNode object) { |
| ObjectNode unflatObjectNode; |
| try { |
| unflatObjectNode = mapper.readValue(JsonUnflattener.unflatten(mapper.writeValueAsString(object)), ObjectNode.class); |
| } catch( Exception ex ) { |
| return null; |
| } |
| return unflatObjectNode; |
| } |
| |
| /** |
| * merge parent and child properties maps. |
| * @param content ObjectNode |
| * @param parent ObjectNode |
| * @return merged ObjectNode |
| */ |
| public static ObjectNode mergeProperties(ObjectNode content, ObjectNode parent) { |
| |
| ObjectNode merged = parent.deepCopy(); |
| Iterator<Map.Entry<String, JsonNode>> fields = content.fields(); |
| for ( ; fields.hasNext(); ) { |
| Map.Entry<String, JsonNode> field = fields.next(); |
| String fieldId = field.getKey(); |
| if( merged.get(fieldId) != null ) { |
| if( merged.get(fieldId).getNodeType().equals(JsonNodeType.OBJECT)) { |
| merged.put(fieldId, mergeProperties(field.getValue().deepCopy(), (ObjectNode)merged.get(fieldId))); |
| } else if ( merged.get(fieldId).getNodeType().equals(JsonNodeType.ARRAY)) { |
| merged.put(fieldId, mergeArrays(((ArrayNode)field.getValue()), ((ArrayNode)merged.get(fieldId)))); |
| } else { |
| merged.put(fieldId, content.get(fieldId)); |
| } |
| } else { |
| merged.put(fieldId, content.get(fieldId)); |
| } |
| } |
| return merged; |
| } |
| |
| public ObjectNode cleanProperties(ObjectNode content) { |
| return cleanProperties(mapper, content); |
| } |
| |
| public static ObjectNode cleanProperties(ObjectMapper mapper, ObjectNode content) { |
| |
| ObjectNode cleaned = mapper.createObjectNode(); |
| |
| Iterator<Map.Entry<String, JsonNode>> fields = content.fields(); |
| for ( ; fields.hasNext(); ) { |
| Map.Entry<String, JsonNode> field = fields.next(); |
| String fieldId = field.getKey(); |
| if( field.getValue() != null && !field.getValue().getNodeType().equals(JsonNodeType.NULL)) { |
| if( field.getValue().getNodeType().equals(JsonNodeType.OBJECT)) { |
| ObjectNode clean = cleanProperties(mapper, field.getValue().deepCopy()); |
| if( clean != null && clean.size() > 0 ) { |
| cleaned.put(fieldId, clean); |
| } |
| } else if ( field.getValue().getNodeType().equals(JsonNodeType.ARRAY)) { |
| ArrayNode clean = cleanArray((ArrayNode)field.getValue()); |
| if( clean != null && clean.size() > 0 ) { |
| cleaned.put(fieldId, clean); |
| } |
| } else if ( field.getValue().getNodeType().equals(JsonNodeType.STRING)) { |
| String value = content.get(fieldId).asText(); |
| if( value != null && StringUtils.isNotBlank(value)) { |
| cleaned.put(fieldId, value); |
| } |
| } else { |
| cleaned.put(fieldId, field.getValue()); |
| } |
| } |
| } |
| return cleaned; |
| } |
| |
| /** |
| * merge two arrays. |
| * @param content ArrayNode |
| * @param parent ArrayNode |
| * @return merged ArrayNode |
| */ |
| private static ArrayNode mergeArrays(ArrayNode content, ArrayNode parent) { |
| return parent.deepCopy().addAll(content); |
| } |
| |
| /** |
| * clean an array. |
| * @param content ArrayNode |
| * @return cleaned ArrayNode |
| */ |
| private static ArrayNode cleanArray(ArrayNode content) { |
| if( content.size() == 0) return null; |
| Iterator<JsonNode> items = content.iterator(); |
| for ( ; items.hasNext(); ) { |
| JsonNode item = items.next(); |
| if( item == null ) items.remove(); |
| if( item.getNodeType().equals(JsonNodeType.OBJECT)) { |
| if( item.size() == 0 ) items.remove(); |
| } |
| if( item.getNodeType().equals(JsonNodeType.ARRAY)) { |
| if( item.size() == 0 ) items.remove(); |
| } |
| } |
| if( content.size() == 0) return null; |
| else return content; |
| } |
| |
| } |