diff options
Diffstat (limited to 'gson')
6 files changed, 752 insertions, 0 deletions
diff --git a/gson/src/main/java/org/onap/policy/common/gson/JacksonFieldAdapterFactory.java b/gson/src/main/java/org/onap/policy/common/gson/JacksonFieldAdapterFactory.java new file mode 100644 index 00000000..67c51449 --- /dev/null +++ b/gson/src/main/java/org/onap/policy/common/gson/JacksonFieldAdapterFactory.java @@ -0,0 +1,181 @@ +/* + * ============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; + +import com.google.gson.Gson; +import com.google.gson.JsonElement; +import com.google.gson.JsonObject; +import com.google.gson.TypeAdapter; +import com.google.gson.TypeAdapterFactory; +import com.google.gson.reflect.TypeToken; +import com.google.gson.stream.JsonReader; +import com.google.gson.stream.JsonWriter; +import java.io.IOException; +import java.lang.reflect.Field; +import java.util.ArrayList; +import java.util.List; +import org.onap.policy.common.gson.internal.ClassWalker; +import org.onap.policy.common.gson.internal.Deserializer; +import org.onap.policy.common.gson.internal.FieldDeserializer; +import org.onap.policy.common.gson.internal.FieldSerializer; +import org.onap.policy.common.gson.internal.Serializer; + +/** + * Factory that serializes/deserializes class fields following the normal behavior of + * jackson. Supports the following annotations: + * <ul> + * <li>GsonJsonIgnore</li> + * <li>GsonJsonProperty</li> + * </ul> + * + * <p>Note: {@link JacksonExclusionStrategy} must also be registered with the gson object. + */ +public class JacksonFieldAdapterFactory implements TypeAdapterFactory { + + @Override + public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { + Class<? super T> clazz = type.getRawType(); + + if (!JacksonExclusionStrategy.isManaged(clazz)) { + return null; + } + + ClassWalker data = new ClassWalker(); + data.walkClassHierarchy(clazz); + + if (data.getInProps(Field.class).isEmpty() && data.getOutProps(Field.class).isEmpty()) { + // no fields to serialize + return null; + } + + return new JacksonFieldAdapter<>(gson, data, gson.getDelegateAdapter(this, type)); + } + + /** + * Adapter for a single class. + * + * @param <T> type of class on which the adapter works + */ + private static class JacksonFieldAdapter<T> extends TypeAdapter<T> { + + /** + * Used to create an object of the given class. + */ + private final TypeAdapter<T> delegate; + + /** + * Used to serialize/deserialize a JsonElement. + */ + private final TypeAdapter<JsonElement> elementAdapter; + + /** + * Serializers for each item within the object. + */ + private final Serializer[] serializers; + + /** + * Deserializers for each item within the object. + */ + private final Deserializer[] deserializers; + + /** + * Constructs the object. + * + * @param gson the associated gson object + * @param data data used to configure the adapter + * @param delegate default constructor for the type + */ + public JacksonFieldAdapter(Gson gson, ClassWalker data, TypeAdapter<T> delegate) { + this.delegate = delegate; + + this.elementAdapter = gson.getAdapter(JsonElement.class); + + // create serializers + this.serializers = makeSerializers(gson, data).toArray(new Serializer[0]); + + // create deserializers + this.deserializers = makeDeserializers(gson, data).toArray(new Deserializer[0]); + } + + /** + * Creates a complete list of serializers. + * + * @param gson the associated gson object + * @param data data used to configure the serializers + * @return a list of all serializers + */ + private List<Serializer> makeSerializers(Gson gson, ClassWalker data) { + List<Serializer> ser = new ArrayList<Serializer>(); + + data.getOutProps(Field.class).forEach(field -> ser.add(new FieldSerializer(gson, field))); + + return ser; + } + + /** + * Creates a complete list of deserializers. + * + * @param gson the associated gson object + * @param data data used to configure the deserializers + * @return a list of all deserializers + */ + private List<Deserializer> makeDeserializers(Gson gson, ClassWalker data) { + List<Deserializer> deser = new ArrayList<Deserializer>(); + + data.getInProps(Field.class).forEach(field -> deser.add(new FieldDeserializer(gson, field))); + + return deser; + } + + @Override + public void write(JsonWriter out, T value) throws IOException { + JsonElement tree = delegate.toJsonTree(value); + + if (tree.isJsonObject()) { + JsonObject jsonObj = tree.getAsJsonObject(); + + // serialize each item from the value into the target tree + for (Serializer serializer : serializers) { + serializer.addToTree(value, jsonObj); + } + } + + elementAdapter.write(out, tree); + } + + @Override + public T read(JsonReader in) throws IOException { + JsonElement tree = elementAdapter.read(in); + T object = delegate.fromJsonTree(tree); + + if (tree.isJsonObject()) { + JsonObject jsonObj = tree.getAsJsonObject(); + + // deserialize each item from the tree into the target object + for (Deserializer dser : deserializers) { + dser.getFromTree(jsonObj, object); + } + } + + return object; + } + } +} diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/FieldDeserializer.java b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldDeserializer.java new file mode 100644 index 00000000..14a432d1 --- /dev/null +++ b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldDeserializer.java @@ -0,0 +1,72 @@ +/* + * ============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 com.google.gson.Gson; +import com.google.gson.JsonElement; +import com.google.gson.JsonObject; +import com.google.gson.JsonParseException; +import java.lang.reflect.Field; + +/** + * De-serializer for fields that are exposed. + */ +public class FieldDeserializer extends Adapter implements Deserializer { + + public static final String SET_ERR = "cannot set field: "; + + /** + * Field within the object. + */ + private final Field field; + + /** + * Constructs the object. + * + * @param gson Gson object providing type adapters + * @param field field within the object + */ + public FieldDeserializer(Gson gson, Field field) { + super(gson, field); + + this.field = field; + + field.setAccessible(true); + } + + @Override + public void getFromTree(JsonObject source, Object target) { + JsonElement jsonEl = source.get(getPropName()); + if (jsonEl == null || jsonEl.isJsonNull()) { + return; + } + + Object value = fromJsonTree(jsonEl); + + try { + field.set(target, value); + + } catch (IllegalArgumentException | IllegalAccessException e) { + throw new JsonParseException(makeError(SET_ERR), e); + } + } + +} diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java new file mode 100644 index 00000000..1c9d8b37 --- /dev/null +++ b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java @@ -0,0 +1,80 @@ +/* + * ============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 com.google.gson.Gson; +import com.google.gson.JsonElement; +import com.google.gson.JsonNull; +import com.google.gson.JsonObject; +import com.google.gson.JsonParseException; +import java.lang.reflect.Field; + +/** + * Serializer for fields that are exposed. + */ +public class FieldSerializer extends Adapter implements Serializer { + + public static final String GET_ERR = "cannot get field: "; + + /** + * Field within the object. + */ + private final Field field; + + /** + * Constructs the object. + * + * @param gson Gson object providing type adapters + * @param field field within the object + */ + public FieldSerializer(Gson gson, Field field) { + super(gson, field); + + this.field = field; + + field.setAccessible(true); + } + + @Override + public void addToTree(Object source, JsonObject target) { + Object value; + try { + value = getFromObject(source); + + } catch (IllegalArgumentException | IllegalAccessException e) { + throw new JsonParseException(makeError(GET_ERR), e); + } + + JsonElement jsonEl = (value == null ? JsonNull.INSTANCE : toJsonTree(value)); + target.add(getPropName(), jsonEl); + } + + /** + * Gets the field from the source object. Overridden during junit testing. + * + * @param source object containing the field + * @return the field's value + * @throws IllegalAccessException if an error occurs + */ + protected Object getFromObject(Object source) throws IllegalAccessException { + return field.get(source); + } +} diff --git a/gson/src/test/java/org/onap/policy/common/gson/JacksonFieldAdapterFactoryTest.java b/gson/src/test/java/org/onap/policy/common/gson/JacksonFieldAdapterFactoryTest.java new file mode 100644 index 00000000..9d4b4388 --- /dev/null +++ b/gson/src/test/java/org/onap/policy/common/gson/JacksonFieldAdapterFactoryTest.java @@ -0,0 +1,214 @@ +/* + * ============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; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertNotNull; +import static org.junit.Assert.assertNull; + +import com.google.gson.Gson; +import com.google.gson.GsonBuilder; +import com.google.gson.JsonElement; +import com.google.gson.reflect.TypeToken; +import java.util.ArrayList; +import java.util.List; +import org.junit.Test; +import org.onap.policy.common.gson.JacksonExclusionStrategy; +import org.onap.policy.common.gson.JacksonFieldAdapterFactory; +import org.onap.policy.common.gson.annotation.GsonJsonIgnore; +import org.onap.policy.common.gson.annotation.GsonJsonProperty; + +public class JacksonFieldAdapterFactoryTest { + + private static JacksonFieldAdapterFactory factory = new JacksonFieldAdapterFactory(); + + private static Gson gson = new GsonBuilder().setExclusionStrategies(new JacksonExclusionStrategy()) + .registerTypeAdapterFactory(factory).create(); + + @Test + public void testCreate() { + // unhandled types + assertNull(factory.create(gson, TypeToken.get(JsonElement.class))); + assertNull(factory.create(gson, TypeToken.get(NothingToSerialize.class))); + + assertNotNull(factory.create(gson, TypeToken.get(Data.class))); + assertNotNull(factory.create(gson, TypeToken.get(Derived.class))); + + Data data = new Data(); + + // deserialize using fields that aren't in the Data object + Data data2 = gson.fromJson("{\"abc\":100}", Data.class); + assertEquals(data.toString(), data2.toString()); + + // now work with valid fields + data.id = 10; + data.text = "hello"; + + String result = gson.toJson(data); + data2 = gson.fromJson(result, Data.class); + assertEquals(data.toString(), data2.toString()); + + // should also work with derived types + Derived der = new Derived(); + der.setId(20); + der.text = "world"; + der.unserialized = "abc"; + + result = gson.toJson(der); + + // should not contain the unserialized field + assertFalse(result.contains("abc")); + + Derived der2 = gson.fromJson(result, Derived.class); + der.unserialized = null; + assertEquals(der.toString(), der2.toString()); + } + + @Test + public void testCreate_Lists() { + DataList lst = new DataList(); + lst.theList = new ArrayList<>(); + lst.theList.add(new Data(200, "text 20")); + lst.theList.add(new Data(210, "text 21")); + + String result = gson.toJson(lst); + assertEquals("{'theList':[{'my-id':200,'text':'text 20'},{'my-id':210,'text':'text 21'}]}".replace('\'', '"'), + result); + + DataList lst2 = gson.fromJson(result, DataList.class); + assertEquals(stripIdent(lst.toString()), stripIdent(lst2.toString())); + assertEquals(Data.class, lst2.theList.get(0).getClass()); + } + + @Test + public void testCreate_OnlyOutProps() { + InFieldIgnored data = new InFieldIgnored(); + data.value = "out only"; + + // field should be serialized + String result = gson.toJson(data); + assertEquals("{'value':'out only'}".replace('\'', '"'), result); + + // field should NOT be deserialized + data = gson.fromJson(result, InFieldIgnored.class); + assertNull(data.value); + } + + @Test + public void testCreate_OnlyInProps() { + OutFieldIgnored data = new OutFieldIgnored(); + data.value = "in only"; + + // field should NOT be serialized + String result = gson.toJson(data); + assertEquals("{}", result); + + // field should NOT be deserialized + data = gson.fromJson("{'value':'in only'}".replace('\'', '"'), OutFieldIgnored.class); + assertEquals("in only", data.value); + } + + /** + * Object identifiers may change with each execution, so this method is used to strip + * the identifier from the text string so that the strings will still match across + * different runs. + * + * @param text text from which to strip the identifier + * @return the text, without the identifier + */ + private String stripIdent(String text) { + return text.replaceFirst("@\\w+", "@"); + } + + private static class Data { + @GsonJsonProperty("my-id") + private int id; + + public String text; + + public Data() { + super(); + } + + public Data(int id, String text) { + this.id = id; + this.text = text; + } + + public void setId(int id) { + this.id = id; + } + + @Override + public String toString() { + return "Data [id=" + id + ", text=" + text + "]"; + } + } + + private static class Derived extends Data { + // not serialized + private String unserialized; + + @Override + public String toString() { + return "Derived [unserialized=" + unserialized + ", toString()=" + super.toString() + "]"; + } + } + + private static class DataList { + @GsonJsonProperty + private List<Data> theList; + } + + protected static class NothingToSerialize { + // not serialized + protected String unserialized; + } + + /** + * This has a field that should show up in the "output" list, but not in the "input" + * list, because the method will override it. + */ + private static class InFieldIgnored { + @GsonJsonProperty("value") + private String value; + + @GsonJsonIgnore + public void setValue(String value) { + this.value = value; + } + } + + /** + * This has a field that should show up in the "input" list, but not in the "output" + * list, because the method will override it. + */ + private static class OutFieldIgnored { + @GsonJsonProperty("value") + private String value; + + @GsonJsonIgnore + public String getValue() { + return value; + } + } +} diff --git a/gson/src/test/java/org/onap/policy/common/gson/internal/FieldDeserializerTest.java b/gson/src/test/java/org/onap/policy/common/gson/internal/FieldDeserializerTest.java new file mode 100644 index 00000000..62bab231 --- /dev/null +++ b/gson/src/test/java/org/onap/policy/common/gson/internal/FieldDeserializerTest.java @@ -0,0 +1,109 @@ +/* + * ============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.assertj.core.api.Assertions.assertThatThrownBy; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +import com.google.gson.Gson; +import com.google.gson.GsonBuilder; +import com.google.gson.JsonElement; +import com.google.gson.JsonNull; +import com.google.gson.JsonObject; +import com.google.gson.JsonParseException; +import java.util.List; +import org.junit.Test; +import org.onap.policy.common.gson.JacksonExclusionStrategy; +import org.onap.policy.common.gson.internal.DataAdapterFactory.Data; +import org.onap.policy.common.gson.internal.FieldDeserializer; + +public class FieldDeserializerTest { + private static final String TEXT_FIELD_NAME = "text"; + private static final String LIST_FIELD_NAME = "listField"; + private static final String INITIAL_VALUE = "initial value"; + private static final String NEW_VALUE = "new value"; + + private static DataAdapterFactory dataAdapter = new DataAdapterFactory(); + + private static Gson gson = new GsonBuilder().registerTypeAdapterFactory(dataAdapter) + .setExclusionStrategies(new JacksonExclusionStrategy()).create(); + + private FieldDeserializer deser; + + private String text; + + private List<Data> listField; + + @Test + public void testGetFromTree() throws Exception { + deser = new FieldDeserializer(gson, FieldDeserializerTest.class.getDeclaredField(TEXT_FIELD_NAME)); + + JsonObject json = new JsonObject(); + + // no value in tree - text remains unchanged + text = INITIAL_VALUE; + deser.getFromTree(json, this); + assertEquals(text, INITIAL_VALUE); + + // null value in tree - text remains unchanged + json.add(TEXT_FIELD_NAME, JsonNull.INSTANCE); + deser.getFromTree(json, this); + assertEquals(text, INITIAL_VALUE); + + // now assign a value - text should be changed now + json.addProperty(TEXT_FIELD_NAME, NEW_VALUE); + + deser.getFromTree(json, this); + assertEquals(text, NEW_VALUE); + + /* + * check list field + */ + deser = new FieldDeserializer(gson, FieldDeserializerTest.class.getDeclaredField(LIST_FIELD_NAME)); + + json.add(LIST_FIELD_NAME, DataAdapterFactory.makeArray()); + + dataAdapter.reset(); + listField = null; + deser.getFromTree(json, this); + + assertTrue(dataAdapter.isDataRead()); + assertEquals(DataAdapterFactory.makeList().toString(), listField.toString()); + } + + @Test + public void testGetFromTree_SetEx() throws Exception { + deser = new FieldDeserializer(gson, FieldDeserializerTest.class.getDeclaredField(TEXT_FIELD_NAME)) { + @Override + public Object fromJsonTree(JsonElement tree) { + // return an int, which won't fit in a String - cause an exception + return 10; + } + }; + + JsonObject json = new JsonObject(); + json.addProperty(TEXT_FIELD_NAME, NEW_VALUE); + + assertThatThrownBy(() -> deser.getFromTree(json, this)).isInstanceOf(JsonParseException.class) + .hasMessage(FieldDeserializer.SET_ERR + FieldDeserializerTest.class.getName() + ".text"); + } +} diff --git a/gson/src/test/java/org/onap/policy/common/gson/internal/FieldSerializerTest.java b/gson/src/test/java/org/onap/policy/common/gson/internal/FieldSerializerTest.java new file mode 100644 index 00000000..18167fc0 --- /dev/null +++ b/gson/src/test/java/org/onap/policy/common/gson/internal/FieldSerializerTest.java @@ -0,0 +1,96 @@ +/* + * ============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.assertj.core.api.Assertions.assertThatThrownBy; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +import com.google.gson.Gson; +import com.google.gson.GsonBuilder; +import com.google.gson.JsonElement; +import com.google.gson.JsonObject; +import com.google.gson.JsonParseException; +import java.util.List; +import org.junit.Test; +import org.onap.policy.common.gson.JacksonExclusionStrategy; +import org.onap.policy.common.gson.internal.DataAdapterFactory.Data; +import org.onap.policy.common.gson.internal.FieldSerializer; + +public class FieldSerializerTest { + private static final String TEXT_FIELD_NAME = "text"; + private static final String LIST_FIELD_NAME = "listField"; + + private static DataAdapterFactory dataAdapter = new DataAdapterFactory(); + + private static Gson gson = new GsonBuilder().registerTypeAdapterFactory(dataAdapter) + .setExclusionStrategies(new JacksonExclusionStrategy()).create(); + + private FieldSerializer ser; + + protected String text; + + private List<Data> listField; + + @Test + public void testAddToTree() throws Exception { + ser = new FieldSerializer(gson, FieldSerializerTest.class.getDeclaredField(TEXT_FIELD_NAME)); + + // serialize null value first + text = null; + + JsonObject json = new JsonObject(); + ser.addToTree(this, json); + assertTrue(json.get(TEXT_FIELD_NAME).isJsonNull()); + + // serialize an actual value + text = "hello"; + ser.addToTree(this, json); + assertEquals("hello", json.get(TEXT_FIELD_NAME).getAsString()); + + /* + * check list field + */ + listField = DataAdapterFactory.makeList(); + + ser = new FieldSerializer(gson, FieldSerializerTest.class.getDeclaredField(LIST_FIELD_NAME)); + + dataAdapter.reset(); + JsonElement tree = ser.toJsonTree(listField); + assertTrue(dataAdapter.isDataWritten()); + assertEquals(DataAdapterFactory.ENCODED_LIST, tree.toString()); + } + + @Test + public void testAddToTree_GetEx() throws Exception { + ser = new FieldSerializer(gson, FieldSerializerTest.class.getDeclaredField(TEXT_FIELD_NAME)) { + @Override + protected Object getFromObject(Object source) throws IllegalAccessException { + throw new IllegalAccessException("expected exception"); + } + }; + + text = "world"; + + assertThatThrownBy(() -> ser.addToTree(this, new JsonObject())).isInstanceOf(JsonParseException.class) + .hasMessage(FieldSerializer.GET_ERR + FieldSerializerTest.class.getName() + ".text"); + } +} |