adding constaints to intent API
diff --git a/core/api/src/main/java/org/onlab/onos/net/intent/constraint/LambdaConstraint.java b/core/api/src/main/java/org/onlab/onos/net/intent/constraint/LambdaConstraint.java
new file mode 100644
index 0000000..d1d33d6
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/intent/constraint/LambdaConstraint.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * 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.onlab.onos.net.intent.constraint;
+
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.resource.Lambda;
+import org.onlab.onos.net.resource.LinkResourceService;
+import org.onlab.onos.net.resource.ResourceRequest;
+import org.onlab.onos.net.resource.ResourceType;
+
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Constraint that evaluates links based on available lambda.
+ */
+public class LambdaConstraint extends BooleanConstraint {
+
+ private final Lambda lambda;
+
+ /**
+ * Creates a new optical lambda constraint.
+ *
+ * @param lambda optional lambda to indicate a specific lambda
+ */
+ public LambdaConstraint(Lambda lambda) {
+ this.lambda = lambda;
+ }
+
+ @Override
+ public boolean isValid(Link link, LinkResourceService resourceService) {
+ for (ResourceRequest request : resourceService.getAvailableResources(link)) {
+ if (request.type() == ResourceType.LAMBDA) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Returns the lambda required by this constraint.
+ *
+ * @return required lambda
+ */
+ public Lambda lambda() {
+ return lambda;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(lambda);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj == null || getClass() != obj.getClass()) {
+ return false;
+ }
+ final LambdaConstraint other = (LambdaConstraint) obj;
+ return Objects.equals(this.lambda, other.lambda);
+ }
+
+ @Override
+ public String toString() {
+ return toStringHelper(this).add("lambda", lambda).toString();
+ }
+}