Add ErrorResponse to policy framework exceptions

The ErrorResponse object is now contained in Policy Framework
exceptions.

Issue-ID: POLICY-1095
Change-Id: Ib0ce6cdbbead939afefc4afa3f507eb1a28c4a5c
Signed-off-by: liamfallon <liam.fallon@est.tech>

10 files changed, 160 insertions, 111 deletions

diff --git a/models-base/pom.xml b/models-base/pom.xml
index 712bc9108..0523c3324 100644
--- a/models-base/pom.xml
+++ b/models-base/pom.xml
@@ -17,8 +17,7 @@
   SPDX-License-Identifier: Apache-2.0
   ============LICENSE_END=========================================================
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <parent>
@@ -30,4 +29,12 @@
     <artifactId>policy-models-base</artifactId>
     <name>${project.artifactId}</name>
     <description>[${project.parent.artifactId}] module provides basic model handling for the ONAP Policy Framework</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onap.policy.models</groupId>
+            <artifactId>policy-models-errors</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
 </project>
diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfModelException.java b/models-base/src/main/java/org/onap/policy/models/base/PfModelException.java
index ce44e51f3..46c5bd311 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfModelException.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfModelException.java
@@ -25,18 +25,20 @@ import javax.ws.rs.core.Response;
 import lombok.Getter;
 import lombok.ToString;
 
-import org.apache.commons.lang3.exception.ExceptionUtils;
+import org.onap.policy.models.errors.concepts.ErrorResponse;
+import org.onap.policy.models.errors.concepts.ErrorResponseInfo;
+import org.onap.policy.models.errors.concepts.ErrorResponseUtils;
 
 /**
  * This class is a base exception from which all model exceptions are sub classes.
  */
 @Getter
 @ToString
-public class PfModelException extends Exception implements PfModelExceptionInfo {
+public class PfModelException extends Exception implements ErrorResponseInfo {
     private static final long serialVersionUID = -8507246953751956974L;
 
-    // The status code on the exception
-    private final Response.Status statusCode;
+    // The error response of the exception
+    private final ErrorResponse errorResponse = new ErrorResponse();
 
     // The object on which the exception was thrown
     private final transient Object object;
@@ -60,7 +62,8 @@ public class PfModelException extends Exception implements PfModelExceptionInfo
      */
     public PfModelException(final Response.Status statusCode, final String message, final Object object) {
         super(message);
-        this.statusCode = statusCode;
+        errorResponse.setResponseCode(statusCode);
+        ErrorResponseUtils.getExceptionMessages(errorResponse, this);
         this.object = object;
     }
 
@@ -86,45 +89,8 @@ public class PfModelException extends Exception implements PfModelExceptionInfo
     public PfModelException(final Response.Status statusCode, final String message, final Exception exception,
             final Object object) {
         super(message, exception);
-        this.statusCode = statusCode;
+        errorResponse.setResponseCode(statusCode);
+        ErrorResponseUtils.getExceptionMessages(errorResponse, this);
         this.object = object;
     }
-
-    /**
-     * Get the message from this exception and its causes.
-     *
-     * @return the cascaded messages from this exception and the exceptions that caused it
-     */
-    @Override
-    public String getCascadedMessage() {
-        return buildCascadedMessage(this);
-    }
-
-    /**
-     * Build a cascaded message from an exception and all its nested exceptions.
-     *
-     * @param throwable the top level exception
-     * @return cascaded message string
-     */
-    public static String buildCascadedMessage(Throwable throwable) {
-        final StringBuilder builder = new StringBuilder();
-        builder.append(throwable.getMessage());
-
-        for (Throwable t = throwable; t != null; t = t.getCause()) {
-            builder.append("\ncaused by: ");
-            builder.append(t.getMessage());
-        }
-
-        return builder.toString();
-    }
-
-    /**
-     * Get the stack trace of the exception as a string.
-     *
-     * @return the stack trace of this message as a string
-     */
-    @Override
-    public String getStackTraceAsString() {
-        return ExceptionUtils.getStackTrace(this);
-    }
 }
diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfModelRuntimeException.java b/models-base/src/main/java/org/onap/policy/models/base/PfModelRuntimeException.java
index 32855c2a4..472412865 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfModelRuntimeException.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfModelRuntimeException.java
@@ -25,18 +25,20 @@ import javax.ws.rs.core.Response;
 import lombok.Getter;
 import lombok.ToString;
 
-import org.apache.commons.lang3.exception.ExceptionUtils;
+import org.onap.policy.models.errors.concepts.ErrorResponse;
+import org.onap.policy.models.errors.concepts.ErrorResponseInfo;
+import org.onap.policy.models.errors.concepts.ErrorResponseUtils;
 
 /**
  * This class is a base model run time exception from which all model run time exceptions are sub classes.
  */
 @Getter
 @ToString
-public class PfModelRuntimeException extends RuntimeException implements PfModelExceptionInfo {
+public class PfModelRuntimeException extends RuntimeException implements ErrorResponseInfo {
     private static final long serialVersionUID = -8507246953751956974L;
 
-    // The return code on the exception
-    private final Response.Status statusCode;
+    // The error response of the exception
+    private final ErrorResponse errorResponse = new ErrorResponse();
 
     // The object on which the exception was thrown
     private final transient Object object;
@@ -61,7 +63,8 @@ public class PfModelRuntimeException extends RuntimeException implements PfModel
     public PfModelRuntimeException(final Response.Status statusCode, final String message, final Object object) {
         super(message);
         this.object = object;
-        this.statusCode = statusCode;
+        errorResponse.setResponseCode(statusCode);
+        ErrorResponseUtils.getExceptionMessages(errorResponse, this);
     }
 
     /**
@@ -87,26 +90,7 @@ public class PfModelRuntimeException extends RuntimeException implements PfModel
             final Object object) {
         super(message, exception);
         this.object = object;
-        this.statusCode = statusCode;
-    }
-
-    /**
-     * Get the message from this exception and its causes.
-     *
-     * @return the message of this exception and all the exceptions that caused this exception
-     */
-    @Override
-    public String getCascadedMessage() {
-        return PfModelException.buildCascadedMessage(this);
-    }
-
-    /**
-     * Get the stack trace of the exception as a string.
-     *
-     * @return the stack trace of this message as a string
-     */
-    @Override
-    public String getStackTraceAsString() {
-        return ExceptionUtils.getStackTrace(this);
+        errorResponse.setResponseCode(statusCode);
+        ErrorResponseUtils.getExceptionMessages(errorResponse, this);
     }
 }
diff --git a/models-base/src/test/java/org/onap/policy/models/base/ExceptionsTest.java b/models-base/src/test/java/org/onap/policy/models/base/ExceptionsTest.java
index 0a5b6a0a6..664e3ddbc 100644
--- a/models-base/src/test/java/org/onap/policy/models/base/ExceptionsTest.java
+++ b/models-base/src/test/java/org/onap/policy/models/base/ExceptionsTest.java
@@ -28,6 +28,7 @@ import java.io.IOException;
 import javax.ws.rs.core.Response;
 
 import org.junit.Test;
+import org.onap.policy.models.errors.concepts.ErrorResponse;
 
 public class ExceptionsTest {
 
@@ -41,7 +42,8 @@ public class ExceptionsTest {
         String key = "A String";
         PfModelException ae =
                 new PfModelException(Response.Status.OK, "Message", new IOException("IO exception message"), key);
-        assertEquals("Message\ncaused by: Message\ncaused by: IO exception message", ae.getCascadedMessage());
+        ErrorResponse errorResponse = ae.getErrorResponse();
+        assertEquals("Message\nIO exception message", String.join("\n", errorResponse.getErrorDetails()));
         assertEquals(key, ae.getObject());
 
         assertNotNull(new PfModelRuntimeException(Response.Status.OK, "Message"));
@@ -52,8 +54,9 @@ public class ExceptionsTest {
         String rkey = "A String";
         PfModelRuntimeException re = new PfModelRuntimeException(Response.Status.OK, "Runtime Message",
                 new IOException("IO runtime exception message"), rkey);
-        assertEquals("Runtime Message\ncaused by: Runtime Message\ncaused by: IO runtime exception message",
-                re.getCascadedMessage());
+        errorResponse = re.getErrorResponse();
+        assertEquals("Runtime Message\nIO runtime exception message",
+                String.join("\n", errorResponse.getErrorDetails()));
         assertEquals(key, re.getObject());
     }
 }
diff --git a/models-base/src/test/java/org/onap/policy/models/base/PfModelExceptionInfoTest.java b/models-base/src/test/java/org/onap/policy/models/base/PfModelExceptionInfoTest.java
index 1257975ad..183b44c13 100644
--- a/models-base/src/test/java/org/onap/policy/models/base/PfModelExceptionInfoTest.java
+++ b/models-base/src/test/java/org/onap/policy/models/base/PfModelExceptionInfoTest.java
@@ -25,6 +25,7 @@ import static org.junit.Assert.assertEquals;
 import javax.ws.rs.core.Response;
 
 import org.junit.Test;
+import org.onap.policy.models.errors.concepts.ErrorResponseInfo;
 
 /**
  * Test PfModelExceptionInfo interface.
@@ -49,15 +50,15 @@ public class PfModelExceptionInfoTest {
         }
     }
 
-    private String getErrorMessage(final PfModelExceptionInfo pfme) {
+    private String getErrorMessage(final ErrorResponseInfo eri) {
         StringBuilder stringBuilder = new StringBuilder();
 
         stringBuilder.append("Server returned: ");
-        stringBuilder.append(pfme.getStatusCode().toString());
+        stringBuilder.append(eri.getErrorResponse().getResponseCode().toString());
+        stringBuilder.append("Error Message:\n");
+        stringBuilder.append(eri.getErrorResponse().getErrorMessage());
         stringBuilder.append("\nDetailed Message:\n");
-        stringBuilder.append(pfme.getCascadedMessage());
-        stringBuilder.append("\nStack Trace:\n");
-        stringBuilder.append(pfme.getStackTraceAsString());
+        stringBuilder.append(String.join("\n", eri.getErrorResponse().getErrorDetails()));
 
         return stringBuilder.toString();
     }
diff --git a/models-errors/pom.xml b/models-errors/pom.xml
index ab998537e..4e297868e 100644
--- a/models-errors/pom.xml
+++ b/models-errors/pom.xml
@@ -27,7 +27,7 @@
         <version>2.0.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>models-errors</artifactId>
+    <artifactId>policy-models-errors</artifactId>
 
     <name>${project.artifactId}</name>
     <description>The models for Policy API's to return Error/warning message details.</description>
diff --git a/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponse.java b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponse.java
index b072ba1f6..88960f8ae 100644
--- a/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponse.java
+++ b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponse.java
@@ -22,6 +22,7 @@ package org.onap.policy.models.errors.concepts;
 
 import com.google.gson.annotations.SerializedName;
 
+import java.io.Serializable;
 import java.util.List;
 
 import javax.ws.rs.core.Response;
@@ -36,7 +37,8 @@ import lombok.Data;
  *
  */
 @Data
-public class ErrorResponse {
+public class ErrorResponse implements Serializable {
+    private static final long serialVersionUID = 6760066094588944729L;
 
     @SerializedName("code")
     private Response.Status  responseCode;
diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfModelExceptionInfo.java b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponseInfo.java
index 2fe244cec..ed7104b04 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfModelExceptionInfo.java
+++ b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponseInfo.java
@@ -18,42 +18,19 @@
  * ============LICENSE_END=========================================================
  */
 
-package org.onap.policy.models.base;
-
-import javax.ws.rs.core.Response;
+package org.onap.policy.models.errors.concepts;
 
 /**
- * Interface implemented bu Policy framework model exceptions to allow uniform reading of status codes and cascaded
- * messages.
+ * Interface implemented by Policy framework model exceptions to allow uniform reading of error responses.
  *
  * @author Liam Fallon (liam.fallon@est.tech)
  */
-public interface PfModelExceptionInfo {
-
-    /**
-     * Get the status code associated with an exception.
-     * @return the status code
-     */
-    public Response.Status getStatusCode();
-
-    /**
-     * Get the messages for all the cascaded exceptions in an exception.
-     *
-     * @return the cascaded message
-     */
-    public String getCascadedMessage();
-
-    /**
-     * Get the object associated with an exception.
-     *
-     * @return the object associated with an exception
-     */
-    public Object getObject();
+public interface ErrorResponseInfo {
 
     /**
-     * Get the stack trace of the exception as a string.
+     * Get the error response.
      *
-     * @return the stack trace of this message as a string
+     * @return the error response
      */
-    public String getStackTraceAsString();
+    public ErrorResponse getErrorResponse();
 }
diff --git a/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponseUtils.java b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponseUtils.java
new file mode 100644
index 000000000..6346f9a90
--- /dev/null
+++ b/models-errors/src/main/java/org/onap/policy/models/errors/concepts/ErrorResponseUtils.java
@@ -0,0 +1,56 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.models.errors.concepts;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utility class for managing {@link ErrorResponse objects}
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public final class ErrorResponseUtils {
+    /**
+     * Private constructor used to prevent sub class instantiation.
+     */
+    private ErrorResponseUtils() {}
+
+    /**
+     * Store the cascaded messages from an exception and all its nested exceptions in an ErrorResponse object.
+     *
+     * @param throwable the top level exception
+     */
+    public static void getExceptionMessages(final ErrorResponse errorResponse, final Throwable throwable) {
+        errorResponse.setErrorMessage(throwable.getMessage());
+
+        List<String> cascascadedErrorMessages = new ArrayList<>();
+
+        for (Throwable t = throwable; t != null; t = t.getCause()) {
+            cascascadedErrorMessages.add(t.getMessage());
+        }
+
+        if (!cascascadedErrorMessages.isEmpty()) {
+            errorResponse.setErrorDetails(cascascadedErrorMessages);
+        }
+    }
+}
+
diff --git a/models-errors/src/test/java/org/onap/policy/models/errors/concepts/ErrorResponseUtilsTest.java b/models-errors/src/test/java/org/onap/policy/models/errors/concepts/ErrorResponseUtilsTest.java
new file mode 100644
index 000000000..4f4ef395a
--- /dev/null
+++ b/models-errors/src/test/java/org/onap/policy/models/errors/concepts/ErrorResponseUtilsTest.java
@@ -0,0 +1,53 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.models.errors.concepts;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+/**
+ * Test the {@link ErrorResponseUtils} class.
+ *
+ * @author Liam Fallon (liam.fallon@est.tech)
+ */
+public class ErrorResponseUtilsTest {
+    @Test
+    public void testErrorResponseUtils() {
+        try {
+            try {
+                throw new NumberFormatException("Exception 0");
+            }
+            catch (Exception nfe) {
+                throw new IOException("Exception 1", nfe);
+            }
+        } catch (Exception ioe) {
+            ErrorResponse errorResponse = new ErrorResponse();
+            ErrorResponseUtils.getExceptionMessages(errorResponse, ioe);
+
+            assertEquals("Exception 1", errorResponse.getErrorMessage());
+            assertEquals("Exception 1", errorResponse.getErrorDetails().get(0));
+            assertEquals("Exception 0", errorResponse.getErrorDetails().get(1));
+        }
+    }
+}