Refactor common class from gson code
The TypeAdapters in the gson-jackson code were nearly identical,
so a common class was factored out. This also enabled junit tests
to attain 100% coverage on that code, whereas there were a couple
of branches that could not be tested previously.
Addressed new sonar issues.
Removed unused import.
Change-Id: Id8e6460c881c6ce0239768f182e4e652cd10645f
Issue-ID: POLICY-1428
Signed-off-by: Jim Hahn <jrh3@att.com>
diff --git a/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java b/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java
index 66475e3..6906696 100644
--- a/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java
+++ b/gson/src/main/java/org/onap/policy/common/gson/GsonMessageBodyHandler.java
@@ -31,7 +31,6 @@
import java.nio.charset.StandardCharsets;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
-import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
@@ -117,7 +116,7 @@
@Override
public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
- throws IOException, WebApplicationException {
+ throws IOException {
try (InputStreamReader streamReader = new InputStreamReader(entityStream, StandardCharsets.UTF_8)) {
Type jsonType = (type.equals(genericType) ? type : genericType);
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
index 67c5144..3458a59 100644
--- a/gson/src/main/java/org/onap/policy/common/gson/JacksonFieldAdapterFactory.java
+++ b/gson/src/main/java/org/onap/policy/common/gson/JacksonFieldAdapterFactory.java
@@ -21,14 +21,9 @@
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;
@@ -36,6 +31,7 @@
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.JacksonTypeAdapter;
import org.onap.policy.common.gson.internal.Serializer;
/**
@@ -66,116 +62,40 @@
return null;
}
- return new JacksonFieldAdapter<>(gson, data, gson.getDelegateAdapter(this, type));
+ TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
+ List<Serializer> sers = makeSerializers(gson, data);
+ List<Deserializer> desers = makeDeserializers(gson, data);
+
+ return new JacksonTypeAdapter<>(gson, delegate, sers, desers);
}
/**
- * Adapter for a single class.
+ * Creates a complete list of serializers.
*
- * @param <T> type of class on which the adapter works
+ * @param gson the associated gson object
+ * @param data data used to configure the serializers
+ * @return a list of all serializers
*/
- private static class JacksonFieldAdapter<T> extends TypeAdapter<T> {
+ private List<Serializer> makeSerializers(Gson gson, ClassWalker data) {
+ List<Serializer> ser = new ArrayList<>();
- /**
- * Used to create an object of the given class.
- */
- private final TypeAdapter<T> delegate;
+ data.getOutProps(Field.class).forEach(field -> ser.add(new FieldSerializer(gson, field)));
- /**
- * Used to serialize/deserialize a JsonElement.
- */
- private final TypeAdapter<JsonElement> elementAdapter;
+ return ser;
+ }
- /**
- * Serializers for each item within the object.
- */
- private final Serializer[] serializers;
+ /**
+ * 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<>();
- /**
- * Deserializers for each item within the object.
- */
- private final Deserializer[] deserializers;
+ data.getInProps(Field.class).forEach(field -> deser.add(new FieldDeserializer(gson, field)));
- /**
- * 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;
- }
+ return deser;
}
}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/JacksonMethodAdapterFactory.java b/gson/src/main/java/org/onap/policy/common/gson/JacksonMethodAdapterFactory.java
index 1c3039f..de96231 100644
--- a/gson/src/main/java/org/onap/policy/common/gson/JacksonMethodAdapterFactory.java
+++ b/gson/src/main/java/org/onap/policy/common/gson/JacksonMethodAdapterFactory.java
@@ -21,14 +21,9 @@
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.Method;
import java.util.ArrayList;
import java.util.HashSet;
@@ -38,6 +33,7 @@
import org.onap.policy.common.gson.internal.AnySetterDeserializer;
import org.onap.policy.common.gson.internal.ClassWalker;
import org.onap.policy.common.gson.internal.Deserializer;
+import org.onap.policy.common.gson.internal.JacksonTypeAdapter;
import org.onap.policy.common.gson.internal.MethodDeserializer;
import org.onap.policy.common.gson.internal.MethodSerializer;
import org.onap.policy.common.gson.internal.Serializer;
@@ -65,138 +61,60 @@
ClassWalker data = new ClassWalker();
data.walkClassHierarchy(clazz);
- if (data.getInProps(Method.class).isEmpty() && data.getOutProps(Method.class).isEmpty()) {
- if (data.getAnyGetter() == null && data.getAnySetter() == null) {
- // no methods to serialize
- return null;
- }
+ if (data.getInProps(Method.class).isEmpty() && data.getOutProps(Method.class).isEmpty()
+ && data.getAnyGetter() == null && data.getAnySetter() == null) {
+ // no methods to serialize
+ return null;
}
- return new JacksonMethodAdapter<>(gson, data, gson.getDelegateAdapter(this, type));
+ Set<String> unliftedProps = new HashSet<>();
+ unliftedProps.addAll(data.getInNotIgnored());
+ unliftedProps.addAll(data.getOutNotIgnored());
+
+ TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
+ List<Serializer> sers = makeSerializers(gson, data, unliftedProps);
+ List<Deserializer> desers = makeDeserializers(gson, data, unliftedProps);
+
+ return new JacksonTypeAdapter<>(gson, delegate, sers, desers);
}
/**
- * Adapter for a single class.
+ * Creates a complete list of serializers.
*
- * @param <T> type of class on which the adapter works
+ * @param gson the associated gson object
+ * @param data data used to configure the serializers
+ * @param unliftedProps properties that should not be lowered by "any-getters"
+ * @return a list of all serializers
*/
- private static class JacksonMethodAdapter<T> extends TypeAdapter<T> {
+ private List<Serializer> makeSerializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
+ List<Serializer> ser = new ArrayList<>();
- /**
- * 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 JacksonMethodAdapter(Gson gson, ClassWalker data, TypeAdapter<T> delegate) {
- this.delegate = delegate;
-
- this.elementAdapter = gson.getAdapter(JsonElement.class);
-
- Set<String> unliftedProps = new HashSet<>();
- unliftedProps.addAll(data.getInNotIgnored());
- unliftedProps.addAll(data.getOutNotIgnored());
-
- // create serializers
- this.serializers = makeSerializers(gson, data, unliftedProps).toArray(new Serializer[0]);
-
- // create deserializers
- this.deserializers = makeDeserializers(gson, data, unliftedProps).toArray(new Deserializer[0]);
+ if (data.getAnyGetter() != null) {
+ ser.add(new AnyGetterSerializer(gson, unliftedProps, data.getAnyGetter()));
}
- /**
- * Creates a complete list of serializers.
- *
- * @param gson the associated gson object
- * @param data data used to configure the serializers
- * @param unliftedProps properties that should not be lowered by "any-getters"
- * @return a list of all serializers
- */
- private List<Serializer> makeSerializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
- List<Serializer> ser = new ArrayList<Serializer>();
+ data.getOutProps(Method.class).forEach(method -> ser.add(new MethodSerializer(gson, method)));
- if (data.getAnyGetter() != null) {
- ser.add(new AnyGetterSerializer(gson, unliftedProps, data.getAnyGetter()));
- }
+ return ser;
+ }
- data.getOutProps(Method.class).forEach(method -> ser.add(new MethodSerializer(gson, method)));
+ /**
+ * Creates a complete list of deserializers.
+ *
+ * @param gson the associated gson object
+ * @param data data used to configure the deserializers
+ * @param unliftedProps properties that should not be lifted by "any-setters"
+ * @return a list of all deserializers
+ */
+ private List<Deserializer> makeDeserializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
+ List<Deserializer> deser = new ArrayList<>();
- return ser;
+ if (data.getAnySetter() != null) {
+ deser.add(new AnySetterDeserializer(gson, unliftedProps, data.getAnySetter()));
}
- /**
- * Creates a complete list of deserializers.
- *
- * @param gson the associated gson object
- * @param data data used to configure the deserializers
- * @param unliftedProps properties that should not be lifted by "any-setters"
- * @return a list of all deserializers
- */
- private List<Deserializer> makeDeserializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
- List<Deserializer> deser = new ArrayList<Deserializer>();
+ data.getInProps(Method.class).forEach(method -> deser.add(new MethodDeserializer(gson, method)));
- if (data.getAnySetter() != null) {
- deser.add(new AnySetterDeserializer(gson, unliftedProps, data.getAnySetter()));
- }
-
- data.getInProps(Method.class).forEach(method -> deser.add(new MethodDeserializer(gson, method)));
-
- 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;
- }
+ return deser;
}
}
diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/JacksonTypeAdapter.java b/gson/src/main/java/org/onap/policy/common/gson/internal/JacksonTypeAdapter.java
new file mode 100644
index 0000000..1171fd4
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/internal/JacksonTypeAdapter.java
@@ -0,0 +1,108 @@
+/*
+ * ============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.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.util.List;
+
+
+/**
+ * Adapter for a single class that implements a jackson-style behavior.
+ *
+ * @param <T> type of class on which the adapter works
+ */
+public class JacksonTypeAdapter<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 delegate default constructor for the type
+ * @param serializers the serializers to use to serialize items within the object
+ * @param deserializers the deserializers to use to deserialize items into the object
+ */
+ public JacksonTypeAdapter(Gson gson, TypeAdapter<T> delegate, List<Serializer> serializers,
+ List<Deserializer> deserializers) {
+ this.delegate = delegate;
+ this.elementAdapter = gson.getAdapter(JsonElement.class);
+ this.serializers = serializers.toArray(new Serializer[0]);
+ this.deserializers = deserializers.toArray(new Deserializer[0]);
+ }
+
+ @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/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java b/gson/src/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java
new file mode 100644
index 0000000..a75fe17
--- /dev/null
+++ b/gson/src/test/java/org/onap/policy/common/gson/internal/JacksonTypeAdapterTest.java
@@ -0,0 +1,206 @@
+/*
+ * ============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);
+ }
+}