Merge "Add common coder classes"
diff --git a/utils/pom.xml b/utils/pom.xml
index 3e64f18..3263b7b 100644
--- a/utils/pom.xml
+++ b/utils/pom.xml
@@ -65,6 +65,11 @@
<scope>test</scope>
</dependency>
<dependency>
+ <groupId>org.assertj</groupId>
+ <artifactId>assertj-core</artifactId>
+ <scope>test</scope>
+ </dependency>
+ <dependency>
<groupId>com.openpojo</groupId>
<artifactId>openpojo</artifactId>
<scope>compile</scope>
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
new file mode 100644
index 0000000..41db218
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
@@ -0,0 +1,46 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * 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;
+
+/**
+ * JSON encoder and decoder.
+ */
+public interface Coder {
+
+ /**
+ * Encodes an object into json.
+ *
+ * @param object object to be encoded
+ * @return a json string representing the object
+ * @throws CoderException if an error occurs
+ */
+ String encode(Object object) throws CoderException;
+
+ /**
+ * Decodes a json string into an object.
+ *
+ * @param json json string to be decoded
+ * @param clazz class of object to be decoded
+ * @return the object represented by the given json string
+ * @throws CoderException if an error occurs
+ */
+ <T> T decode(String json, Class<T> clazz) throws CoderException;
+}
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/CoderException.java b/utils/src/main/java/org/onap/policy/common/utils/coder/CoderException.java
new file mode 100644
index 0000000..60e8573
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/CoderException.java
@@ -0,0 +1,44 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * 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;
+
+/**
+ * Exceptions generated by coders.
+ */
+public class CoderException extends Exception {
+ private static final long serialVersionUID = 1L;
+
+ public CoderException() {
+ super();
+ }
+
+ public CoderException(String message) {
+ super(message);
+ }
+
+ public CoderException(Throwable cause) {
+ super(cause);
+ }
+
+ public CoderException(String message, Throwable cause) {
+ super(message, cause);
+ }
+}
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
new file mode 100644
index 0000000..4c7a55c
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
@@ -0,0 +1,84 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * 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.Gson;
+
+/**
+ * JSON encoder and decoder using the "standard" mechanism, which is currently gson.
+ */
+public class StandardCoder implements Coder {
+
+ /**
+ * Gson object used to encode and decode messages.
+ */
+ private static final Gson GSON = new Gson();
+
+ /**
+ * Constructs the object.
+ */
+ public StandardCoder() {
+ super();
+ }
+
+ @Override
+ public String encode(Object object) throws CoderException {
+ try {
+ return toJson(object);
+
+ } catch (RuntimeException e) {
+ throw new CoderException(e);
+ }
+ }
+
+ @Override
+ public <T> T decode(String json, Class<T> clazz) throws CoderException {
+ try {
+ return fromJson(json, clazz);
+
+ } catch (RuntimeException e) {
+ throw new CoderException(e);
+ }
+ }
+
+ // the remaining methods are wrappers that can be overridden by junit tests
+
+ /**
+ * Encodes an object into json, without catching exceptions.
+ *
+ * @param object object to be encoded
+ * @return a json string representing the object
+ */
+ protected String toJson(Object object) {
+ return GSON.toJson(object);
+ }
+
+ /**
+ * Decodes a json string into an object, without catching exceptions.
+ *
+ * @param json json string to be decoded
+ * @param clazz class of object to be decoded
+ * @return the object represented by the given json string
+ */
+ protected <T> T fromJson(String json, Class<T> clazz) {
+ return GSON.fromJson(json, clazz);
+ }
+}
diff --git a/utils/src/test/java/org/onap/policy/common/utils/coder/CoderExceptionTest.java b/utils/src/test/java/org/onap/policy/common/utils/coder/CoderExceptionTest.java
new file mode 100644
index 0000000..cecc426
--- /dev/null
+++ b/utils/src/test/java/org/onap/policy/common/utils/coder/CoderExceptionTest.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.utils.coder;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class CoderExceptionTest {
+ private static final String STRING_VALUE = "My String";
+ private static final Throwable CAUSE = new Throwable();
+
+ private CoderException exc;
+
+ @Test
+ public void testCoderException() {
+ exc = new CoderException();
+
+ assertEquals(null, exc.getMessage());
+ assertSame(null, exc.getCause());
+ assertNotNull(exc.toString());
+ }
+
+ @Test
+ public void testCoderExceptionString() {
+ exc = new CoderException(STRING_VALUE);
+
+ assertEquals(STRING_VALUE, exc.getMessage());
+ assertSame(null, exc.getCause());
+ assertTrue(exc.toString().contains(STRING_VALUE));
+ }
+
+ @Test
+ public void testCoderExceptionThrowable() {
+ exc = new CoderException(CAUSE);
+
+ assertEquals(CAUSE.toString(), exc.getMessage());
+ assertSame(CAUSE, exc.getCause());
+ assertNotNull(exc.toString());
+ }
+
+ @Test
+ public void testCoderExceptionStringThrowable() {
+ exc = new CoderException(STRING_VALUE, CAUSE);
+
+ assertEquals(STRING_VALUE, exc.getMessage());
+ assertSame(CAUSE, exc.getCause());
+ assertTrue(exc.toString().contains(STRING_VALUE));
+ }
+
+}
diff --git a/utils/src/test/java/org/onap/policy/common/utils/coder/StandardCoderTest.java b/utils/src/test/java/org/onap/policy/common/utils/coder/StandardCoderTest.java
new file mode 100644
index 0000000..80157d0
--- /dev/null
+++ b/utils/src/test/java/org/onap/policy/common/utils/coder/StandardCoderTest.java
@@ -0,0 +1,73 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP PAP
+ * ================================================================================
+ * 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 static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+
+public class StandardCoderTest {
+
+ private StandardCoder coder;
+
+ @Before
+ public void setUp() {
+ coder = new StandardCoder();
+ }
+
+ @Test
+ public void testEncode() throws Exception {
+ List<Integer> arr = Arrays.asList(100, 110);
+ assertEquals("[100,110]", coder.encode(arr));
+
+ // test exception case
+ JsonParseException jpe = new JsonParseException("expected exception");
+
+ coder = spy(coder);
+ when(coder.toJson(arr)).thenThrow(jpe);
+
+ assertThatThrownBy(() -> coder.encode(arr)).isInstanceOf(CoderException.class).hasCause(jpe);
+ }
+
+ @Test
+ public void testDecode() throws Exception {
+ String text = "[200,210]";
+ assertEquals(text, coder.decode(text, JsonElement.class).toString());
+
+ // test exception case
+ JsonParseException jpe = new JsonParseException("expected exception");
+
+ coder = spy(coder);
+ when(coder.fromJson(text, JsonElement.class)).thenThrow(jpe);
+
+ assertThatThrownBy(() -> coder.decode(text, JsonElement.class)).isInstanceOf(CoderException.class)
+ .hasCause(jpe);
+ }
+
+}