org.jclouds.elasticstack.functions.MapToDevices.java Source code

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Here is the source code for org.jclouds.elasticstack.functions.MapToDevices.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.elasticstack.functions;

import java.util.Map;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.elasticstack.domain.BlockDevice;
import org.jclouds.elasticstack.domain.Device;
import org.jclouds.elasticstack.domain.IDEDevice;
import org.jclouds.elasticstack.domain.MediaType;
import org.jclouds.elasticstack.domain.SCSIDevice;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.common.collect.ImmutableSet.Builder;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class MapToDevices implements Function<Map<String, String>, Map<String, ? extends Device>> {
    @Singleton
    public static class DeviceToId implements Function<Device, String> {
        @Override
        public String apply(Device input) {
            return input.getId();
        }
    }

    private final Function<Device, String> deviceToId;

    @Inject
    public MapToDevices(Function<Device, String> deviceToId) {
        this.deviceToId = deviceToId;
    }

    public Map<String, ? extends Device> apply(Map<String, String> from) {
        Builder<Device> devices = ImmutableSet.builder();
        addIDEDevices(from, devices);
        addSCSIDevices(from, devices);
        addBlockDevices(from, devices);

        return Maps.uniqueIndex(devices.build(), deviceToId);
    }

    protected void addBlockDevices(Map<String, String> from, Builder<Device> devices) {
        BLOCK: for (int index : new int[] { 0, 1, 2, 3, 4, 5, 6, 7 }) {
            String key = String.format("block:0:%d", index);
            if (!from.containsKey(key))
                break BLOCK;
            devices.add(populateBuilder(new BlockDevice.Builder(index), key, from).build());
        }
    }

    protected void addSCSIDevices(Map<String, String> from, Builder<Device> devices) {
        SCSI: for (int unit : new int[] { 0, 1, 2, 3, 4, 5, 6, 7 }) {
            String key = String.format("scsi:0:%d", unit);
            if (!from.containsKey(key))
                break SCSI;
            devices.add(populateBuilder(new SCSIDevice.Builder(unit), key, from).build());
        }
    }

    protected void addIDEDevices(Map<String, String> from, Builder<Device> devices) {
        IDE: for (int bus : new int[] { 0, 1 })
            for (int unit : new int[] { 0, 1 }) {
                String key = String.format("ide:%d:%d", bus, unit);
                if (!from.containsKey(key))
                    break IDE;
                devices.add(populateBuilder(new IDEDevice.Builder(bus, unit), key, from).build());
            }
    }

    protected Device.Builder populateBuilder(Device.Builder deviceBuilder, String key, Map<String, String> from) {
        deviceBuilder.uuid(from.get(key));
        if (from.containsKey(key + ":media"))
            deviceBuilder.mediaType(MediaType.fromValue(from.get(key + ":media")));
        return deviceBuilder;
    }
}