#137 - Initial support for link templates.

Added LinkTemplate domain type that can deal with URI templates as defined in http://tools.ietf.org/html/rfc6570. We currently support /, ?, & and # variables up to level 3 of the spec (multiple parameter definitions). The templates can be expanded to a Link instance.

Added the necessary HAL mixins to render the instances as specified.

src/main/java/org/springframework/hateoas/hal/Jackson2HalModule.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -27,6 +27,7 @@ import java.util.Map;
 
 import org.springframework.beans.BeanUtils;
 import org.springframework.hateoas.Link;
+import org.springframework.hateoas.LinkTemplate;
 import org.springframework.hateoas.RelProvider;
 import org.springframework.hateoas.Resource;
 import org.springframework.hateoas.ResourceSupport;
@@ -80,6 +81,7 @@ public class Jackson2HalModule extends SimpleModule {
 		super("json-hal-module", new Version(1, 0, 0, null, "org.springframework.hateoas", "spring-hateoas"));
 
 		setMixInAnnotation(Link.class, LinkMixin.class);
+		setMixInAnnotation(LinkTemplate.class, LinkTemplateMixin.class);
 		setMixInAnnotation(ResourceSupport.class, ResourceSupportMixin.class);
 		setMixInAnnotation(Resources.class, ResourcesMixin.class);
 	}

src/main/java/org/springframework/hateoas/hal/LinkTemplateMixin.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2014 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.
+ * 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 org.springframework.hateoas.hal;
+
+import java.util.List;
+
+import org.springframework.hateoas.LinkTemplate;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ * Mixin for {@link LinkTemplate}s.
+ * 
+ * @author Oliver Gierke
+ */
+abstract class LinkTemplateMixin extends LinkMixin {
+
+	private static final long serialVersionUID = -7227899604445243148L;
+
+	@JsonIgnore
+	public abstract List<String> getVariableNames();
+}