From eafbda0c8ae84604d4e6ef154872df070def5ae4 Mon Sep 17 00:00:00 2001
From: Oliver Gierke <ogierke@gopivotal.com>
Date: Thu, 1 May 2014 17:57:04 +0200
Subject: [PATCH] #172 - Made types contained in Link implement Serializable.

---
 .../hateoas/TemplateVariable.java               |  5 ++++-
 .../hateoas/TemplateVariables.java              |  5 ++++-
 .../springframework/hateoas/UriTemplate.java    |  4 +++-
 .../springframework/hateoas/LinkUnitTest.java   | 17 +++++++++++++++++
 4 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/springframework/hateoas/TemplateVariable.java b/src/main/java/org/springframework/hateoas/TemplateVariable.java
index 7074053c..2be80edc 100644
--- a/src/main/java/org/springframework/hateoas/TemplateVariable.java
+++ b/src/main/java/org/springframework/hateoas/TemplateVariable.java
@@ -15,6 +15,7 @@
  */
 package org.springframework.hateoas;
 
+import java.io.Serializable;
 import java.util.Arrays;
 import java.util.List;
 
@@ -26,7 +27,9 @@ import org.springframework.util.StringUtils;
  * 
  * @author Oliver Gierke
  */
-public final class TemplateVariable {
+public final class TemplateVariable implements Serializable {
+
+	private static final long serialVersionUID = -2731446749851863774L;
 
 	private final String name;
 	private final TemplateVariable.VariableType type;
diff --git a/src/main/java/org/springframework/hateoas/TemplateVariables.java b/src/main/java/org/springframework/hateoas/TemplateVariables.java
index fc1be367..2812b196 100644
--- a/src/main/java/org/springframework/hateoas/TemplateVariables.java
+++ b/src/main/java/org/springframework/hateoas/TemplateVariables.java
@@ -15,6 +15,7 @@
  */
 package org.springframework.hateoas;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -29,9 +30,10 @@ import org.springframework.util.Assert;
  * 
  * @author Oliver Gierke
  */
-public final class TemplateVariables implements Iterable<TemplateVariable> {
+public final class TemplateVariables implements Iterable<TemplateVariable>, Serializable {
 
 	public static TemplateVariables NONE = new TemplateVariables();
+	private static final long serialVersionUID = -7736592281223783079L;
 
 	private final List<TemplateVariable> variables;
 
@@ -112,6 +114,7 @@ public final class TemplateVariables implements Iterable<TemplateVariable> {
 	 * (non-Javadoc)
 	 * @see java.lang.Object#toString()
 	 */
+	@Override
 	public String toString() {
 
 		if (variables.isEmpty()) {
diff --git a/src/main/java/org/springframework/hateoas/UriTemplate.java b/src/main/java/org/springframework/hateoas/UriTemplate.java
index c0bfc809..c96d4dd7 100644
--- a/src/main/java/org/springframework/hateoas/UriTemplate.java
+++ b/src/main/java/org/springframework/hateoas/UriTemplate.java
@@ -15,6 +15,7 @@
  */
 package org.springframework.hateoas;
 
+import java.io.Serializable;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -36,9 +37,10 @@ import org.springframework.web.util.UriComponentsBuilder;
  * @see http://tools.ietf.org/html/rfc6570
  * @since 0.9
  */
-public class UriTemplate implements Iterable<TemplateVariable> {
+public class UriTemplate implements Iterable<TemplateVariable>, Serializable {
 
 	private static final Pattern VARIABLE_REGEX = Pattern.compile("\\{([\\?\\&#/]?)([\\w\\,]+)\\}");
+	private static final long serialVersionUID = -1007874653930162262L;
 
 	private final TemplateVariables variables;;
 	private String baseUri;
diff --git a/src/test/java/org/springframework/hateoas/LinkUnitTest.java b/src/test/java/org/springframework/hateoas/LinkUnitTest.java
index ffa209a5..99abac04 100644
--- a/src/test/java/org/springframework/hateoas/LinkUnitTest.java
+++ b/src/test/java/org/springframework/hateoas/LinkUnitTest.java
@@ -18,6 +18,10 @@ package org.springframework.hateoas;
 import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
 
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+
+import org.apache.commons.io.output.ByteArrayOutputStream;
 import org.junit.Test;
 
 /**
@@ -146,4 +150,17 @@ public class LinkUnitTest {
 		assertThat(link.isTemplated(), is(false));
 		assertThat(link.getVariableNames(), hasSize(0));
 	}
+
+	/**
+	 * @see #172
+	 */
+	@Test
+	public void serializesCorrectly() throws IOException {
+
+		Link link = new Link("http://foobar{?foo,bar}");
+
+		ObjectOutputStream stream = new ObjectOutputStream(new ByteArrayOutputStream());
+		stream.writeObject(link);
+		stream.close();
+	}
 }