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-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategy.java104
-rw-r--r--utils/src/test/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategyTest.java202
2 files changed, 306 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategy.java b/utils/src/main/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategy.java
new file mode 100644
index 00000000..96213a65
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategy.java
@@ -0,0 +1,104 @@
+/*
+ * ============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.utils.gson;
+
+import com.google.gson.ExclusionStrategy;
+import com.google.gson.FieldAttributes;
+import com.google.gson.JsonElement;
+import java.lang.reflect.GenericArrayType;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Excludes all fields from serialization/deserialization, if the class is managed.
+ */
+public class JacksonExclusionStrategy implements ExclusionStrategy {
+
+ /**
+ * Classes that are explicitly not managed by the GSON jackson adapters.
+ */
+ // @formatter:off
+ private static final Set<Class<?>> unmanaged = new HashSet<>(Arrays.asList(
+ boolean.class,
+ byte.class,
+ short.class,
+ int.class,
+ long.class,
+ float.class,
+ double.class,
+ char.class,
+ Boolean.class,
+ Byte.class,
+ Short.class,
+ Integer.class,
+ Long.class,
+ Float.class,
+ Double.class,
+ Character.class,
+ String.class));
+ // @formatter:on
+
+ /**
+ * Classes whose subclasses are explicitly not managed by the GSON jackson adapters.
+ */
+ // @formatter:off
+ private static final Set<Class<?>> unmanagedSuper = new HashSet<>(Arrays.asList(
+ GenericArrayType.class,
+ Map.class,
+ Collection.class,
+ JsonElement.class));
+ // @formatter:on
+
+ @Override
+ public boolean shouldSkipField(FieldAttributes attrs) {
+ return isManaged(attrs.getDeclaringClass());
+ }
+
+ @Override
+ public boolean shouldSkipClass(Class<?> clazz) {
+ return false;
+ }
+
+ /**
+ * Determines if a class is managed by this adapter, which typically means that it is
+ * <i>not</i> a generic class such as {@link JsonElement} or some type of collection.
+ *
+ * @param clazz the class to be examined
+ * @return {@code true} if the class is managed by this adapter, {@code false}
+ * otherwise
+ */
+ public static boolean isManaged(Class<?> clazz) {
+ if (clazz.isArray() || clazz.isEnum() || clazz.isPrimitive() || unmanaged.contains(clazz)) {
+ return false;
+ }
+
+ for (Class<?> sup : unmanagedSuper) {
+ if (sup.isAssignableFrom(clazz)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+}
diff --git a/utils/src/test/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategyTest.java b/utils/src/test/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategyTest.java
new file mode 100644
index 00000000..e8927902
--- /dev/null
+++ b/utils/src/test/java/org/onap/policy/common/utils/gson/JacksonExclusionStrategyTest.java
@@ -0,0 +1,202 @@
+/*
+ * ============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.utils.gson;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import com.google.gson.FieldAttributes;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonElement;
+import java.lang.reflect.GenericArrayType;
+import java.util.LinkedList;
+import java.util.TreeMap;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class JacksonExclusionStrategyTest {
+
+ private static JacksonExclusionStrategy strategy;
+ private static Gson gson;
+
+ @BeforeClass
+ public static void setUpBeforeClass() {
+ strategy = new JacksonExclusionStrategy();
+ gson = new GsonBuilder().setExclusionStrategies(strategy).create();
+ }
+
+ @Test
+ public void testWithGson() {
+ Derived data = new Derived();
+ data.setId(10);
+ data.setText("some text");
+ data.setValue("some value");
+
+ // no fields should be serialized
+ String result = gson.toJson(data);
+ assertEquals("{}", result);
+
+ // no fields should be deserialized
+ result = "{'id':20, 'text':'my text', 'value':'my value'}".replace('\'', '"');
+ Derived data2 = gson.fromJson(result, Derived.class);
+ assertEquals(new Derived().toString(), data2.toString());
+ }
+
+ @Test
+ public void testShouldSkipField() throws Exception {
+ // should skip every field of Data
+ assertTrue(strategy.shouldSkipField(new FieldAttributes(Data.class.getDeclaredField("id"))));
+ assertTrue(strategy.shouldSkipField(new FieldAttributes(Data.class.getDeclaredField("text"))));
+
+ // should not skip fields in Map
+ assertFalse(strategy.shouldSkipField(new FieldAttributes(MyMap.class.getDeclaredField("mapId"))));
+ }
+
+ @Test
+ public void testShouldSkipClass() {
+ assertFalse(strategy.shouldSkipClass(null));
+ assertFalse(strategy.shouldSkipClass(Object.class));
+ }
+
+ @Test
+ public void testIsManaged() {
+ assertTrue(JacksonExclusionStrategy.isManaged(Data.class));
+ assertTrue(JacksonExclusionStrategy.isManaged(Intfc.class));
+ assertTrue(JacksonExclusionStrategy.isManaged(com.google.gson.TypeAdapter.class));
+
+ // generic classes
+ assertFalse(JacksonExclusionStrategy.isManaged(new Data[0].getClass()));
+ assertFalse(JacksonExclusionStrategy.isManaged(Enum.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(boolean.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(byte.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(short.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(int.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(long.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(float.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(double.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(char.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Boolean.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Byte.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Short.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Integer.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Long.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Float.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Double.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(Character.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(String.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(MyMap.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(MyList.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(MyJson.class));
+ assertFalse(JacksonExclusionStrategy.isManaged(GenericArrayType.class));
+ }
+
+ /**
+ * Used to verify that no fields are exposed.
+ */
+ public static class Data {
+ private int id;
+ public String text;
+
+ public int getId() {
+ return id;
+ }
+
+ public void setId(int id) {
+ this.id = id;
+ }
+
+ public String getText() {
+ return text;
+ }
+
+ public void setText(String text) {
+ this.text = text;
+ }
+
+ @Override
+ public String toString() {
+ return "Data [id=" + id + ", text=" + text + "]";
+ }
+ }
+
+ public static class Derived extends Data {
+ protected String value;
+
+ public String getValue() {
+ return value;
+ }
+
+ public void setValue(String value) {
+ this.value = value;
+ }
+
+ @Override
+ public String toString() {
+ return "Derived [value=" + value + ", " + super.toString() + "]";
+ }
+ }
+
+ /**
+ * Used to verify that enums are not managed.
+ */
+ public static enum Enum {
+ UP, DOWN,
+ }
+
+ /**
+ * Used to verify that interfaces <i>are</i> managed.
+ */
+ public static interface Intfc {
+ int getId();
+ }
+
+ /**
+ * Used to verify that Maps are not managed.
+ */
+ public static class MyMap extends TreeMap<String, Data> {
+ private static final long serialVersionUID = 1L;
+
+ private int mapId;
+
+ public int getMapId() {
+ return mapId;
+ }
+ }
+
+ /**
+ * Used to verify that Collections are not managed.
+ */
+ public static class MyList extends LinkedList<Data> {
+ private static final long serialVersionUID = 1L;
+ }
+
+ /**
+ * Used to verify that JsonElements are not managed.
+ */
+ public static class MyJson extends JsonElement {
+ @Override
+ public JsonElement deepCopy() {
+ return null;
+ }
+ }
+}