Merge pull request #34 from embulk/test-JsonPointerBasedFilter-with-sequence-of-jsons

Test JsonPointerBasedFilter with sequence of JSONs

Author: dmikurube

src/test/java/org/embulk/util/json/TestJacksonFilter.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2023 The Embulk project
+ *
+ * Licensed 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.embulk.util.json;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.core.JsonPointer;
+import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.core.filter.FilteringParserDelegate;
+import com.fasterxml.jackson.core.filter.JsonPointerBasedFilter;
+import com.fasterxml.jackson.core.json.PackageVersion;
+import java.io.IOException;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+public class TestJacksonFilter {
+    @Test
+    public void testFilterSequenceSkippingNonMatch() throws IOException {
+        // This |parser| returns only {"bar":"baz"} and {"bar":"qux"}, with just skipping {"xxx":{"yyy":"zzz"}}.
+        final com.fasterxml.jackson.core.JsonParser parser = createFilteredParser(
+                "{\"foo\":{\"bar\":\"baz\"}}{\"xxx\":{\"yyy\":\"zzz\"}}{\"foo\":{\"bar\":\"quux\"}}",
+                JsonPointer.compile("/foo"));
+        assertEquals(JsonToken.START_OBJECT, parser.nextToken());
+        assertEquals(JsonToken.FIELD_NAME, parser.nextToken());
+        assertEquals("bar", parser.getValueAsString());
+        assertEquals(JsonToken.VALUE_STRING, parser.nextToken());
+        assertEquals("baz", parser.getValueAsString());
+        assertEquals(JsonToken.END_OBJECT, parser.nextToken());
+        assertEquals(JsonToken.START_OBJECT, parser.nextToken());
+        assertEquals(JsonToken.FIELD_NAME, parser.nextToken());
+        assertEquals("bar", parser.getValueAsString());
+        assertEquals(JsonToken.VALUE_STRING, parser.nextToken());
+        assertEquals("quux", parser.getValueAsString());
+        assertEquals(JsonToken.END_OBJECT, parser.nextToken());
+        assertNull(parser.nextToken());
+    }
+
+    @BeforeAll
+    static void printJacksonVersion() {
+        System.out.println("Tested with Jackson: " + PackageVersion.VERSION.toString());
+    }
+
+    private static com.fasterxml.jackson.core.JsonParser createFilteredParser(
+            final String json, final JsonPointer jsonPointer) throws IOException {
+        final JsonFactory factory = new JsonFactory();
+        factory.enable(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS);
+        factory.enable(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_NON_NUMERIC_NUMBERS);
+
+        return new FilteringParserDelegate(
+                factory.createParser(json),
+                new JsonPointerBasedFilter(jsonPointer),
+                false,  // TODO: Use com.fasterxml.jackson.core.filter.TokenFilter.Inclusion since Jackson 2.12.
+                true  // Allow multiple matches
+                );
+    }
+}