#667 - Fix Link to ignore setting "templated" properties.

Deserializing a Link with a templated URI will cause Jackson to break due to there being no "templated" property. This adds a private, no-op `setTemplated` method to allow deserialization to occur yet not alter the Link..

Author: gregturn

src/main/java/org/springframework/hateoas/Link.java

@@ -207,14 +207,26 @@ public List<TemplateVariable> getVariables() {
 	}
 
 	/**
-	 * Returns whether the link is templated.
+	 * Returns whether or not the link is templated.
 	 * 
 	 * @return
 	 */
 	public boolean isTemplated() {
 		return !getUriTemplate().getVariables().isEmpty();
 	}
 
+	/**
+	 * This no-op setter is required to deserialize a link that contains a templated URL. It allows Jackson to
+	 * "set" the property, but since {@code templated} is a virtual property, the injected value {@code true} or
+	 * {@code false) is ignored.
+	 *
+	 * The method is kept private so no one attempts to actually use it.
+	 *
+	 * @param __ - don't care what value is passed in. The true value {@link #isTemplated()} is based upon the {@link UriTemplate}.
+	 */
+	private void setTemplated(boolean __) {
+	}
+
 	/**
 	 * Turns the current template into a {@link Link} by expanding it using the given parameters.
 	 * 

src/test/java/org/springframework/hateoas/hal/Jackson2HalIntegrationTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 
 import static org.assertj.core.api.Assertions.*;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -453,6 +454,26 @@ public void rendersSingleLinkAsArrayWhenConfigured() throws Exception {
 		assertThat(write(resourceSupport)).isEqualTo("{\"_links\":{\"self\":[{\"href\":\"localhost\"}]}}");
 	}
 
+	/**
+	 * @see #667
+	 */
+	@Test
+	public void handleTemplatedLinksOnDeserialization() throws IOException {
+
+		ResourceSupport original = new ResourceSupport();
+		original.add(new Link("/orders{?id}", "order"));
+
+		String serialized = mapper.writeValueAsString(original);
+
+		String expected = "{\"_links\":{\"order\":{\"href\":\"/orders{?id}\",\"templated\":true}}}";
+
+		assertThat(serialized).isEqualTo(expected);
+
+		ResourceSupport deserialized = mapper.readValue(serialized, ResourceSupport.class);
+
+		assertThat(deserialized).isEqualTo(original);
+	}
+
 	private static void verifyResolvedTitle(String resourceBundleKey) throws Exception {
 
 		LocaleContextHolder.setLocale(Locale.US);