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Posted to commits@camel.apache.org by da...@apache.org on 2024/03/01 12:25:54 UTC
(camel) 01/01: CAMEL-20495: camel-jsonpath - If resultType is List then automatic wrap single element into a List.
This is an automated email from the ASF dual-hosted git repository.
davsclaus pushed a commit to branch jp-list
in repository https://gitbox.apache.org/repos/asf/camel.git
commit 014e83d5adab53a53d5d9f5b6a7ac9ebfdd5763f
Author: Claus Ibsen <cl...@gmail.com>
AuthorDate: Fri Mar 1 13:25:27 2024 +0100
CAMEL-20495: camel-jsonpath - If resultType is List then automatic wrap single element into a List.
---
.../src/main/docs/jsonpath-language.adoc | 9 ++-
.../apache/camel/jsonpath/JsonPathExpression.java | 14 ++++-
.../jsonpath/JsonPathSplitSingleListTest.java | 69 ++++++++++++++++++++++
3 files changed, 88 insertions(+), 4 deletions(-)
diff --git a/components/camel-jsonpath/src/main/docs/jsonpath-language.adoc b/components/camel-jsonpath/src/main/docs/jsonpath-language.adoc
index d93c48c8603..37e45a1b942 100644
--- a/components/camel-jsonpath/src/main/docs/jsonpath-language.adoc
+++ b/components/camel-jsonpath/src/main/docs/jsonpath-language.adoc
@@ -284,10 +284,15 @@ You can use JSONPath to split a JSON document, such as:
[source,java]
----
from("direct:start")
- .split().jsonpath("$.store.book[*]")
+ .split().jsonpath("$.store.book[*]", List.class)
.to("log:book");
----
+IMPORTANT: Notice how we specify `List.class` as the result-type. This is because if there is only
+a single element (only 1 book), then jsonpath will return the single entity as a `Map` instead of `List<Map>`.
+Therefore, we tell Camel that the result should always be a `List`, and Camel will then automatic wrap the
+single element into a new `List` object.
+
Then each book is logged, however the message body is a `Map` instance. Sometimes
you may want to output this as plain String JSON value instead, which can be done
with the `writeAsString` option as shown:
@@ -295,7 +300,7 @@ with the `writeAsString` option as shown:
[source,java]
----
from("direct:start")
- .split().jsonpathWriteAsString("$.store.book[*]")
+ .split().jsonpathWriteAsString("$.store.book[*]", List.class)
.to("log:book");
----
diff --git a/components/camel-jsonpath/src/main/java/org/apache/camel/jsonpath/JsonPathExpression.java b/components/camel-jsonpath/src/main/java/org/apache/camel/jsonpath/JsonPathExpression.java
index e6bbfd0a473..f4ce1e74ea8 100644
--- a/components/camel-jsonpath/src/main/java/org/apache/camel/jsonpath/JsonPathExpression.java
+++ b/components/camel-jsonpath/src/main/java/org/apache/camel/jsonpath/JsonPathExpression.java
@@ -17,6 +17,7 @@
package org.apache.camel.jsonpath;
import java.util.Collection;
+import java.util.LinkedList;
import java.util.List;
import com.jayway.jsonpath.Option;
@@ -156,13 +157,22 @@ public class JsonPathExpression extends ExpressionAdapter {
if (unpackArray) {
// in some cases we get a single element that is wrapped in a List, so unwrap that
// if we for example want to grab the single entity and convert that to a int/boolean/String etc
- boolean resultIsCollection = Collection.class.isAssignableFrom(resultType);
+ boolean resultTypeIsCollection = Collection.class.isAssignableFrom(resultType);
boolean singleElement = result instanceof List && ((List<?>) result).size() == 1;
- if (singleElement && !resultIsCollection) {
+ if (singleElement && !resultTypeIsCollection) {
result = ((List<?>) result).get(0);
LOG.trace("Unwrapping result: {} from single element List before converting to: {}", result,
resultType);
}
+ } else {
+ // special for List
+ boolean resultTypeIsCollection = Collection.class.isAssignableFrom(resultType);
+ boolean resultIsCollection = result instanceof List;
+ if (resultTypeIsCollection && !resultIsCollection) {
+ var list = new LinkedList<>();
+ list.add(result);
+ return list;
+ }
}
return exchange.getContext().getTypeConverter().convertTo(resultType, exchange, result);
} else {
diff --git a/components/camel-jsonpath/src/test/java/org/apache/camel/jsonpath/JsonPathSplitSingleListTest.java b/components/camel-jsonpath/src/test/java/org/apache/camel/jsonpath/JsonPathSplitSingleListTest.java
new file mode 100644
index 00000000000..9325c3a97cb
--- /dev/null
+++ b/components/camel-jsonpath/src/test/java/org/apache/camel/jsonpath/JsonPathSplitSingleListTest.java
@@ -0,0 +1,69 @@
+/*
+ * 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.camel.jsonpath;
+
+import java.io.File;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.test.junit5.CamelTestSupport;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class JsonPathSplitSingleListTest extends CamelTestSupport {
+
+ @Override
+ protected RouteBuilder createRouteBuilder() {
+ return new RouteBuilder() {
+ @Override
+ public void configure() {
+ from("direct:start")
+ // we select first book, but since we split after wards then ensure
+ // it will be wrapped inside a List object.
+ .split().jsonpath("$.store.book[0]", List.class)
+ .to("mock:authors")
+ .convertBodyTo(String.class);
+ }
+ };
+ }
+
+ @Test
+ public void testSplit() throws Exception {
+ getMockEndpoint("mock:authors").expectedMessageCount(1);
+
+ String out = template.requestBody("direct:start", new File("src/test/resources/books.json"), String.class);
+ assertNotNull(out);
+
+ MockEndpoint.assertIsSatisfied(context);
+
+ Map row = getMockEndpoint("mock:authors").getReceivedExchanges().get(0).getIn().getBody(Map.class);
+ assertEquals("Nigel Rees", row.get("author"));
+ assertEquals(Double.valueOf("8.95"), row.get("price"));
+
+ // should preserve quotes etc
+ assertTrue(out.contains("\"author\": \"Nigel Rees\""));
+ assertTrue(out.contains("\"price\": 8.95"));
+ assertTrue(out.contains("\"title\": \"Sword's of Honour\""));
+ assertTrue(out.contains("\"price\": 12.99,"));
+ }
+
+}