HONEYCOMB-431: make DataModification.validate idempotent

This patch modifies contract of DataModification.validate
to make it idempotent.

ModifiableDataTreeManager.validate now invokes dataTree.validate
on a copy of DataTreeModification.

ModifiableDataTreeManager.validateCandidate was introduced
to allow additional validation.

Change-Id: I86fc101faff9b04afde2f3eb16fff4d4df2867ad
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/infra/translate-api/src/main/java/io/fd/honeycomb/translate/ValidationFailedException.java b/infra/translate-api/src/main/java/io/fd/honeycomb/translate/ValidationFailedException.java
new file mode 100644
index 000000000..776716218
--- /dev/null
+++ b/infra/translate-api/src/main/java/io/fd/honeycomb/translate/ValidationFailedException.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ *
+ * 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.
+ */
+
+package io.fd.honeycomb.translate;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Thrown when validation fails at the translation layer.
+ */
+public class ValidationFailedException extends TranslationException {
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Constructs an {@link ValidationFailedException} given exception detail message.
+     *
+     * @param message the exception detail message
+     */
+    public ValidationFailedException(@Nonnull final String message) {
+        super(message);
+    }
+
+    /**
+     * Constructs an {@link ValidationFailedException} given exception detail message and exception cause.
+     *
+     * @param cause   the cause of validation failure
+     * @param message the exception detail message
+     */
+    public ValidationFailedException(@Nonnull final String message, @Nonnull final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Constructs an {@link ValidationFailedException} given exception cause.
+     *
+     * @param cause the cause of validated failure
+     */
+    public ValidationFailedException(@Nonnull final Throwable cause) {
+        super(cause);
+    }
+}