added new predicates helpful with links

labs/vcloud-director/src/main/java/org/jclouds/vcloud/director/v1_5/predicates/LinkPredicates.java

@@ -0,0 +1,71 @@
+/*
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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.jclouds.vcloud.director.v1_5.predicates;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import org.jclouds.vcloud.director.v1_5.domain.Link;
+
+import com.google.common.base.Predicate;
+
+/**
+ * Predicates handy when working with Links
+ * 
+ * @author Adrian Cole
+ */
+
+public class LinkPredicates {
+
+   /**
+    * matches links of the given relation
+    * 
+    * @param rel
+    *           ex. {@code context.getApi().getCurrentSession().getOrg().getLinks()}
+    * @return predicate that will match links of the given rel
+    */
+   public static Predicate<Link> relEquals(final String rel) {
+      checkNotNull(rel, "rel must be defined");
+
+      return new Predicate<Link>() {
+         @Override
+         public boolean apply(Link link) {
+            return rel.equals(link.getRel());
+         }
+
+         @Override
+         public String toString() {
+            return "relEquals(" + rel + ")";
+         }
+      };
+   }
+
+   /**
+    * @see ReferenceTypePredicates#nameEquals
+    */
+   public static Predicate<Link> nameEquals(String name) {
+      return ReferenceTypePredicates.nameEquals(name);
+   }
+
+   /**
+    * @see ReferenceTypePredicates#typeEquals
+    */
+   public static Predicate<Link> typeEquals(String type) {
+      return ReferenceTypePredicates.typeEquals(type);
+   }
+}

labs/vcloud-director/src/test/java/org/jclouds/vcloud/director/v1_5/predicates/LinkPredicatesTest.java

@@ -0,0 +1,59 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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.jclouds.vcloud.director.v1_5.predicates;
+
+import static org.jclouds.vcloud.director.v1_5.predicates.LinkPredicates.relEquals;
+import static org.jclouds.vcloud.director.v1_5.predicates.LinkPredicates.typeEquals;
+
+import java.net.URI;
+
+import org.jclouds.vcloud.director.v1_5.VCloudDirectorMediaType;
+import org.jclouds.vcloud.director.v1_5.domain.Link;
+import org.testng.annotations.Test;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "LinkPredicatesTest")
+public class LinkPredicatesTest {
+   Link ref = Link.builder().type("application/vnd.vmware.vcloud.media+xml").rel("add").href(
+            URI.create("https://mycloud.greenhousedata.com/api/vdc/e9cd3387-ac57-4d27-a481-9bee75e0690f/media"))
+            .build();
+
+   @Test
+   public void testRelEqualsWhenEqual() {
+      assert relEquals("add").apply(ref);
+   }
+
+   @Test
+   public void testRelEqualsWhenNotEqual() {
+      assert !relEquals("foo").apply(ref);
+   }
+
+   @Test
+   public void testTypeEqualsWhenEqual() {
+      assert typeEquals(VCloudDirectorMediaType.MEDIA).apply(ref);
+   }
+
+   @Test
+   public void testTypeEqualsWhenNotEqual() {
+      assert !typeEquals("foo").apply(ref);
+   }
+}