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From GitBox <...@apache.org>
Subject [GitHub] [nifi] mans2singh commented on a change in pull request #3646: NIFI-6546 - Add JsonPath set value support
Date Mon, 26 Aug 2019 00:15:32 GMT
mans2singh commented on a change in pull request #3646: NIFI-6546 - Add JsonPath set value
support
URL: https://github.com/apache/nifi/pull/3646#discussion_r317421458
 
 

 ##########
 File path: nifi-commons/nifi-expression-language/src/main/java/org/apache/nifi/attribute/expression/language/evaluation/functions/JsonPathSetEvaluator.java
 ##########
 @@ -0,0 +1,57 @@
+/*
+ * 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.nifi.attribute.expression.language.evaluation.functions;
+
+import com.jayway.jsonpath.DocumentContext;
+import com.jayway.jsonpath.JsonPath;
+import org.apache.nifi.attribute.expression.language.EvaluationContext;
+import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
+import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
+import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
+
+/**
+ * JsonPathSetEvaluator allows setting values at the specified existing path
+ */
+public class JsonPathSetEvaluator extends JsonPathBaseEvaluator {
+
+    protected Evaluator<?> valueEvaluator;
+
+    public JsonPathSetEvaluator(final Evaluator<String> subject, final Evaluator<String>
jsonPathExp, final Evaluator<?> valueEvaluator) {
+        super(subject, jsonPathExp);
+        this.valueEvaluator = valueEvaluator;
+    }
+
+    @Override
+    public QueryResult<String> evaluate(EvaluationContext context) {
+        DocumentContext documentContext = getDocumentContext(context);
+        final JsonPath compiledJsonPath = getJsonPath(context);
+
+        final Object value = valueEvaluator.evaluate(context).getValue();
+
+        String result;
+        try {
+            result = documentContext.set(compiledJsonPath, value).jsonString();
+        } catch (Exception e) {
+            // assume the path did not match anything in the document
 
 Review comment:
   Added error log

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