Attributes impl for spec 0.2

Signed-off-by: Fabio José <fabiojose@gmail.com>

api/src/main/java/io/cloudevents/v02/AttributesImpl.java

@@ -0,0 +1,136 @@
+package io.cloudevents.v02;
+
+import java.net.URI;
+import java.time.ZonedDateTime;
+import java.util.Optional;
+
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Pattern;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+
+import io.cloudevents.Attributes;
+import io.cloudevents.fun.BinaryFormatAttributeUnmarshaller;
+import io.cloudevents.json.ZonedDateTimeDeserializer;
+/**
+ * 
+ * @author fabiojose
+ *
+ */
+@JsonInclude(value = Include.NON_ABSENT)
+public class AttributesImpl implements Attributes {
+	
+	@NotBlank
+	private final String type;
+	
+	@NotBlank
+	@Pattern(regexp = "0\\.2")
+	private final String specversion;
+	
+	@NotNull
+	private final URI source;
+	
+	@NotBlank
+	private final String id;
+	
+	private final ZonedDateTime time;
+	private final URI schemaurl;
+	private final String contenttype;
+	
+	public AttributesImpl(String type, String specversion, URI source,
+			String id, ZonedDateTime time, URI schemaurl, String contenttype) {
+		this.type = type;
+		this.specversion = specversion;
+		this.source = source;
+		this.id = id;
+		this.time = time;
+		this.schemaurl = schemaurl;
+		this.contenttype = contenttype;
+	}
+
+	/**
+     * Type of occurrence which has happened. Often this property is used for
+     * routing, observability, policy enforcement, etc.
+     */
+	public String getType() {
+		return type;
+	}
+	
+	/**
+     * ID of the event. The semantics of this string are explicitly
+     * undefined to ease the implementation of producers. Enables
+     * deduplication.
+     */
+	public String getId() {
+		return id;
+	}
+	
+	/**
+     * The version of the CloudEvents specification which the event uses.
+     * This enables the interpretation of the context.
+     */
+	public String getSpecversion() {
+		return specversion;
+	}
+	
+	/**
+     * This describes the event producer. Often this will include
+     * information such as the type of the event source, the organization
+     * publishing the event, and some unique identifiers.
+     * The exact syntax and semantics behind the data encoded in the URI
+     * is event producer defined.
+     */
+	public URI getSource() {
+		return source;
+	}
+
+	/**
+     * Timestamp of when the event happened.
+     */
+	@JsonDeserialize(using = ZonedDateTimeDeserializer.class)
+	public Optional<ZonedDateTime> getTime() {
+		return Optional.ofNullable(time);
+	}
+	
+	/**
+     * A link to the schema that the data attribute adheres to.
+     */
+	public Optional<URI> getSchemaurl() {
+		return Optional.ofNullable(schemaurl);
+	}
+	
+	/**
+     * Describe the data encoding format
+     */
+	public Optional<String> getContenttype() {
+		return Optional.ofNullable(contenttype);
+	}
+
+	@JsonCreator
+	public static AttributesImpl build(
+			@JsonProperty("id") String id,
+			@JsonProperty("source") URI source,
+			@JsonProperty("specversion") String specversion,
+			@JsonProperty("type") String type,
+			@JsonProperty("time") ZonedDateTime time,
+			@JsonProperty("schemaurl") URI schemaurl,
+			@JsonProperty("contenttype") String contenttype) {
+		
+		return new AttributesImpl(type, specversion, source, id, time,
+				schemaurl, contenttype);
+	}
+	
+	/**
+	 * The attribute unmarshaller for the binary format, that receives a
+	 * {@code Map} with attributes names as String and value as String.
+	 */
+	public static BinaryFormatAttributeUnmarshaller<AttributesImpl> unmarshaller() {
+		
+		return null;
+	}
+}