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-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java18
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java56
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java93
3 files changed, 166 insertions, 1 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
index 66a308f7..bb51f2b9 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
@@ -106,4 +106,22 @@ public interface Coder {
* @throws CoderException if an error occurs
*/
<T> T decode(File source, Class<T> clazz) throws CoderException;
+
+ /**
+ * Converts an object/POJO to a standard object.
+ *
+ * @param object object to be converted
+ * @return a new standard object representing the original object
+ * @throws CoderException if an error occurs
+ */
+ StandardCoderObject toStandard(Object object) throws CoderException;
+
+ /**
+ * Converts a standard object to an object/POJO.
+ *
+ * @param sco the standard object to be converted
+ * @return a new object represented by the standard object
+ * @throws CoderException if an error occurs
+ */
+ <T> T fromStandard(StandardCoderObject sco, Class<T> clazz) throws CoderException;
}
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
index 389720f9..69a211b6 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
@@ -21,6 +21,11 @@
package org.onap.policy.common.utils.coder;
import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonElement;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
@@ -42,7 +47,8 @@ public class StandardCoder implements Coder {
/**
* Gson object used to encode and decode messages.
*/
- private static final Gson GSON = new Gson();
+ private static final Gson GSON = new GsonBuilder()
+ .registerTypeAdapter(StandardCoderObject.class, new StandardTypeAdapter()).create();
/**
* Constructs the object.
@@ -137,6 +143,26 @@ public class StandardCoder implements Coder {
}
}
+ @Override
+ public StandardCoderObject toStandard(Object object) throws CoderException {
+ try {
+ return new StandardCoderObject(GSON.toJsonTree(object));
+
+ } catch (RuntimeException e) {
+ throw new CoderException(e);
+ }
+ }
+
+ @Override
+ public <T> T fromStandard(StandardCoderObject sco, Class<T> clazz) throws CoderException {
+ try {
+ return GSON.fromJson(sco.getData(), clazz);
+
+ } catch (RuntimeException e) {
+ throw new CoderException(e);
+ }
+ }
+
// the remaining methods are wrappers that can be overridden by junit tests
/**
@@ -223,4 +249,32 @@ public class StandardCoder implements Coder {
protected <T> T fromJson(Reader source, Class<T> clazz) {
return GSON.fromJson(source, clazz);
}
+
+ /**
+ * Adapter for standard objects.
+ */
+ private static class StandardTypeAdapter extends TypeAdapter<StandardCoderObject> {
+
+ /**
+ * Used to read/write a JsonElement.
+ */
+ private static TypeAdapter<JsonElement> elementAdapter = new Gson().getAdapter(JsonElement.class);
+
+ /**
+ * Constructs the object.
+ */
+ public StandardTypeAdapter() {
+ super();
+ }
+
+ @Override
+ public void write(JsonWriter out, StandardCoderObject value) throws IOException {
+ elementAdapter.write(out, value.getData());
+ }
+
+ @Override
+ public StandardCoderObject read(JsonReader in) throws IOException {
+ return new StandardCoderObject(elementAdapter.read(in));
+ }
+ }
}
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java
new file mode 100644
index 00000000..60c5f4ef
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java
@@ -0,0 +1,93 @@
+/*
+ * ============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.coder;
+
+import com.google.gson.JsonElement;
+
+/**
+ * Object type used by the {@link StandardCoder}. Different serialization tools have
+ * different "standard objects". For instance, GSON uses {@link JsonElement}. This class
+ * wraps that object so that it can be used without exposing the object, itself.
+ */
+public class StandardCoderObject {
+
+ /**
+ * Data wrapped by this.
+ */
+ private final JsonElement data;
+
+ /**
+ * Constructs the object.
+ */
+ public StandardCoderObject() {
+ data = null;
+ }
+
+ /**
+ * Constructs the object.
+ *
+ * @param data data wrapped by this object.
+ */
+ protected StandardCoderObject(JsonElement data) {
+ this.data = data;
+ }
+
+ /**
+ * Gets the data wrapped by this.
+ *
+ * @return the data wrapped by this
+ */
+ protected JsonElement getData() {
+ return data;
+ }
+
+ /**
+ * Gets a field's value from this object, traversing the object hierarchy.
+ *
+ * @param fields field hierarchy
+ * @return the field value or {@code null} if the field does not exist or is not a
+ * primitive
+ */
+ public String getString(String... fields) {
+
+ /*
+ * This could be relatively easily modified to allow Integer arguments, as well,
+ * which would be used to specify indices within an array.
+ */
+
+ JsonElement jel = data;
+
+ for (String field : fields) {
+ if (jel == null) {
+ return null;
+ }
+
+ if (jel.isJsonObject()) {
+ jel = jel.getAsJsonObject().get(field);
+
+ } else {
+ return null;
+ }
+ }
+
+ return (jel != null && jel.isJsonPrimitive() ? jel.getAsString() : null);
+ }
+}