/*
 * Copyright 2016-present 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.onosproject.driver.optical.query;

import org.onosproject.net.ChannelSpacing;
import org.onosproject.net.GridType;
import org.onosproject.net.OchSignal;
import org.onosproject.net.Port;
import org.onosproject.net.PortNumber;
import org.onosproject.net.behaviour.LambdaQuery;
import org.onosproject.net.device.DeviceService;
import org.onosproject.net.driver.AbstractHandlerBehaviour;

import java.util.Collections;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

/**
 * Lambda query implementation for LINC-OE Optical Emulator switch.
 *
 * The LINC ROADM emulator exposes two types of ports: OCh ports connect to ports in the packet layer,
 * while OMS ports connect to an OMS port on a neighbouring ROADM.
 *
 * LINC exposes OchSignal resources: 80 lambdas of 50 GHz (fixed grid) around ITU-T G.694.1 center frequency 193.1 GHz.
 */

public class LincOELambdaQuery extends AbstractHandlerBehaviour implements LambdaQuery {

    private static final int LAMBDA_COUNT = 80;

    @Override
    public Set<OchSignal> queryLambdas(PortNumber port) {
        DeviceService deviceService = this.handler().get(DeviceService.class);
        Port p = deviceService.getPort(this.data().deviceId(), port);

        // OCh ports don't expose lambda resources
        if (!p.type().equals(Port.Type.OMS)) {
            return Collections.emptySet();
        }

        // OMS ports expose 80 fixed grid lambdas of 50GHz width, centered around the ITU-T center frequency 193.1 THz.
        return IntStream.range(0, LAMBDA_COUNT)
                .mapToObj(x -> new OchSignal(GridType.DWDM, ChannelSpacing.CHL_50GHZ, x - (LAMBDA_COUNT / 2), 4))
                .collect(Collectors.toSet());
    }
}

@@ -658,16 +658,55 @@
 query;%0A%0A
+import org.onlab.util.GuavaCollectors;%0A
 import o
@@ -1058,53 +1058,49 @@
 ort 
-java.util.Collections;%0Aimport java.util.
+com.google.common.collect.Immutable
 Set;%0A
+%0A
 impo
@@ -1116,25 +1116,11 @@
 til.
-stream.Collectors
+Set
 ;%0Aim
@@ -1665,16 +1665,408 @@
  = 80;%0A%0A
+    /**%0A     * OMS ports expose 80 fixed grid lambdas of 50GHz width,%0A     * centered around the ITU-T center frequency 193.1 THz.%0A     */%0A    private static final Set%3COchSignal%3E OMS_LAMDAS = IntStream.range(0, LAMBDA_COUNT)%0A            .mapToObj(x -%3E new OchSignal(GridType.DWDM, ChannelSpacing.CHL_50GHZ, x - (LAMBDA_COUNT / 2), 4))%0A            .collect(GuavaCollectors.toImmutableSet());%0A%0A
     @Ove
@@ -2208,16 +2208,17 @@
 class);%0A
+%0A
         
@@ -2343,16 +2343,41 @@
     if (
+p == null %7C%7C%0A            
 !p.type(
@@ -2426,28 +2426,23 @@
 urn 
-Collections.emptySet
+ImmutableSet.of
 ();%0A
@@ -2464,326 +2464,25 @@
     
-// OMS ports expose 80 fixed grid lambdas of 50GHz width, centered around the ITU-T center frequency 193.1 THz.%0A        return IntStream.range(0, LAMBDA_COUNT)%0A                .mapToObj(x -%3E new OchSignal(GridType.DWDM, ChannelSpacing.CHL_50GHZ, x - (
+return OMS_
 LAM
-B
 DA
-_COUNT / 2), 4))%0A                .collect(Collectors.toSet())
+S
 ;%0A  

Fix NPE in LincOELambdaQuery.