Adding deserializer for ZonedDateTime

Signed-off-by: Matthias Wessendorf <mwessend@redhat.com>

api/pom.xml

@@ -35,14 +35,12 @@
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
             <version>${jackson.version}</version>
-            <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jdk8</artifactId>
             <version>${jackson.version}</version>
-            <scope>test</scope>
         </dependency>
 
         <dependency>

api/src/main/java/io/cloudevents/impl/DefaultCloudEventImpl.java

@@ -15,6 +15,7 @@
  */
 package io.cloudevents.impl;
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.cloudevents.CloudEvent;
 
 import java.io.Serializable;
@@ -137,6 +138,7 @@ public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
         this.eventTypeVersion = eventTypeVersion;
     }
 
+    @JsonDeserialize(using = ZonedDateTimeDeserializer.class)
     void setEventTime(ZonedDateTime eventTime) {
         this.eventTime = eventTime;
     }

api/src/main/java/io/cloudevents/impl/ZonedDateTimeDeserializer.java

@@ -0,0 +1,46 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * 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.cloudevents.impl;
+
+import java.io.IOException;
+import java.time.DateTimeException;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+
+public class ZonedDateTimeDeserializer extends StdDeserializer<ZonedDateTime> {
+
+    public ZonedDateTimeDeserializer() {
+        this(null);
+    }
+
+    public ZonedDateTimeDeserializer(Class<?> vc) {
+        super(vc);
+    }
+
+    @Override
+    public ZonedDateTime deserialize(JsonParser jsonparser, DeserializationContext ctxt) throws IOException {
+        // not serializing timezone data yet
+        try {
+            return ZonedDateTime.parse(jsonparser.getText(), DateTimeFormatter.ISO_OFFSET_DATE_TIME);
+        } catch (DateTimeException e) {
+            throw new IllegalArgumentException("could not parse");
+        }
+    }
+}