Add DefaultLinkResourceRequest implementation.
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/DefaultLinkResourceRequest.java b/core/api/src/main/java/org/onlab/onos/net/resource/DefaultLinkResourceRequest.java
new file mode 100644
index 0000000..38f90c1
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/DefaultLinkResourceRequest.java
@@ -0,0 +1,118 @@
+package org.onlab.onos.net.resource;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.intent.IntentId;
+
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Implementation of {@link LinkResourceRequest}.
+ */
+public final class DefaultLinkResourceRequest implements LinkResourceRequest {
+
+    private final IntentId intentId;
+    private final Collection<Link> links;
+    private final Set<ResourceRequest> resources;
+
+    /**
+     * Creates a new link resource request with the given ID, links, and
+     * resource requests.
+     *
+     * @param intentId intent ID related to this request
+     * @param links a set of links for the request
+     * @param resources a set of resources to be requested
+     */
+    private DefaultLinkResourceRequest(IntentId intentId,
+            Collection<Link> links,
+            Set<ResourceRequest> resources) {
+        this.intentId = intentId;
+        this.links = ImmutableSet.copyOf(links);
+        this.resources = ImmutableSet.copyOf(resources);
+    }
+
+    @Override
+    public IntentId intendId() {
+        return intentId;
+    }
+
+    @Override
+    public Collection<Link> links() {
+        return links;
+    }
+
+    @Override
+    public Set<ResourceRequest> resources() {
+        return resources;
+    }
+
+    /**
+     * Returns builder of link resource request.
+     *
+     * @param intentId intent ID related to this request
+     * @param links a set of links for the request
+     * @return builder of link resource request
+     */
+    public static LinkResourceRequest.Builder builder(
+            IntentId intentId, Collection<Link> links) {
+        return new Builder(intentId, links);
+    }
+
+    /**
+     * Builder of link resource request.
+     */
+    public static final class Builder implements LinkResourceRequest.Builder {
+        private IntentId intentId;
+        private Collection<Link> links;
+        private Set<ResourceRequest> resources;
+
+        /**
+         * Creates a new link resource request.
+         *
+         * @param intentId intent ID related to this request
+         * @param links a set of links for the request
+         */
+        private Builder(IntentId intentId, Collection<Link> links) {
+            this.intentId = intentId;
+            this.links = links;
+            this.resources = new HashSet<>();
+        }
+
+        /**
+         * Adds lambda request.
+         *
+         * @return self
+         */
+        @Override
+        public Builder addLambdaRequest() {
+            resources.add(new LambdaResourceRequest());
+            return this;
+        }
+
+        /**
+         * Adds bandwidth request with bandwidth value.
+         *
+         * @param bandwidth bandwidth value to be requested
+         * @return self
+         */
+        @Override
+        public Builder addBandwidthRequest(double bandwidth) {
+            resources.add(new BandwidthResourceRequest(bandwidth));
+            return this;
+        }
+
+        /**
+         * Returns link resource request.
+         *
+         * @return link resource request
+         */
+        @Override
+        public LinkResourceRequest build() {
+            return new DefaultLinkResourceRequest(intentId, links, resources);
+        }
+    }
+
+}