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-rw-r--r--gson/src/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java206
1 files changed, 206 insertions, 0 deletions
diff --git a/gson/src/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java b/gson/src/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java
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+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.gson.internal;
+
+import static org.junit.Assert.assertEquals;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+import com.google.gson.TypeAdapter;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+
+public class JacksonTypeAdapterTest {
+ private static final String HELLO = "hello";
+ private static final String WORLD = "world";
+
+ /**
+ * Gson object that excludes fields, as we're going to process the fields ourselves.
+ */
+ private static Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
+
+ private JacksonTypeAdapter<Data> adapter;
+ private List<Serializer> sers;
+ private List<Deserializer> desers;
+
+ /**
+ * Initializes the previously defined fields.
+ */
+ @Before
+ public void setUp() {
+ // create list of serializers, one for "id" and one for "value"
+ sers = new ArrayList<>(2);
+ sers.add(new NamedSer(HELLO) {
+ @Override
+ protected String getValue(Data data) {
+ return data.id;
+ }
+ });
+ sers.add(new NamedSer(WORLD) {
+ @Override
+ protected String getValue(Data data) {
+ return data.value;
+ }
+ });
+
+ // create list of deserializers, one for "id" and one for "value"
+ desers = new ArrayList<>(2);
+ desers.add(new NamedDeser(HELLO) {
+ @Override
+ protected void setValue(Data data, String value) {
+ data.id = value;
+ }
+ });
+ desers.add(new NamedDeser(WORLD) {
+ @Override
+ protected void setValue(Data data, String value) {
+ data.value = value;
+ }
+ });
+
+ TypeAdapter<Data> delegate = gson.getDelegateAdapter(null, TypeToken.get(Data.class));
+
+ adapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
+ }
+
+ @Test
+ public void testWriteJsonWriterT() throws Exception {
+ Data data = new Data("abc", "def");
+
+ StringWriter wtr = new StringWriter();
+ adapter.write(new JsonWriter(wtr), data);
+
+ assertEquals("{'hello':'abc','world':'def'}".replace('\'', '"'), wtr.toString());
+ }
+
+ /**
+ * Tests the case where the delegate does not return a JsonObject.
+ *
+ * @throws Exception if an error occurs
+ */
+ @Test
+ public void testWriteJsonWriterT_NotAnObject() throws Exception {
+ TypeAdapter<String> delegate = gson.getAdapter(String.class);
+ JacksonTypeAdapter<String> stringAdapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
+
+ StringWriter wtr = new StringWriter();
+ stringAdapter.write(new JsonWriter(wtr), "write text");
+
+ assertEquals("'write text'".replace('\'', '"'), wtr.toString());
+ }
+
+ @Test
+ public void testReadJsonReader() throws Exception {
+ Data data = adapter
+ .read(new JsonReader(new StringReader("{'hello':'four','world':'score'}".replace('\'', '"'))));
+
+ assertEquals(new Data("four", "score").toString(), data.toString());
+ }
+
+ /**
+ * Tests the case where the delegate does not use a JsonObject.
+ *
+ * @throws Exception if an error occurs
+ */
+ @Test
+ public void testReadJsonReader_NotAnObject() throws Exception {
+ TypeAdapter<String> delegate = gson.getAdapter(String.class);
+ JacksonTypeAdapter<String> stringAdapter = new JacksonTypeAdapter<>(gson, delegate, sers, desers);
+
+ String data = stringAdapter.read(new JsonReader(new StringReader("'read text'".replace('\'', '"'))));
+
+ assertEquals("read text", data.toString());
+ }
+
+ private static class Data {
+ private String id;
+ private String value;
+
+ /*
+ * This is invoked by gson via reflection, thus no direct invocation. Hence it has
+ * to be labeled "unused".
+ */
+ @SuppressWarnings("unused")
+ public Data() {
+ super();
+ }
+
+ public Data(String id, String value) {
+ this.id = id;
+ this.value = value;
+ }
+
+ @Override
+ public String toString() {
+ return "Data [id=" + id + ", value=" + value + "]";
+ }
+ }
+
+ private abstract static class NamedSer implements Serializer {
+ private final String name;
+
+ /**
+ * Constructs the object.
+ *
+ * @param name the name of the field, when stored in a JsonObject
+ */
+ public NamedSer(String name) {
+ this.name = name;
+ }
+
+ @Override
+ public void addToTree(Object source, JsonObject target) {
+ Data data = (Data) source;
+ target.addProperty(name, getValue(data));
+ }
+
+ protected abstract String getValue(Data data);
+ }
+
+ private abstract static class NamedDeser implements Deserializer {
+ private final String name;
+
+ /**
+ * Constructs the object.
+ *
+ * @param name the name of the field, when stored in a JsonObject
+ */
+ public NamedDeser(String name) {
+ this.name = name;
+ }
+
+ @Override
+ public void getFromTree(JsonObject source, Object target) {
+ Data data = (Data) target;
+ setValue(data, source.get(name).getAsString());
+ }
+
+ protected abstract void setValue(Data data, String value);
+ }
+}