org.jclouds.ec2.binders.BindBlockDeviceMappingToIndexedFormParams.java Source code

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Here is the source code for org.jclouds.ec2.binders.BindBlockDeviceMappingToIndexedFormParams.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.ec2.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.lang.String.format;
import static org.jclouds.http.utils.Queries.queryParser;
import static org.jclouds.io.Payloads.newUrlEncodedFormPayload;

import java.util.Map;
import java.util.Map.Entry;

import org.jclouds.ec2.domain.BlockDevice;
import org.jclouds.http.HttpRequest;
import org.jclouds.rest.Binder;

import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;

/**
 * @author Oleksiy Yarmula
 * @author Adrian Cole
 */
public class BindBlockDeviceMappingToIndexedFormParams implements Binder {

    private static final String deviceNamePattern = "BlockDeviceMapping.%d.DeviceName";
    private static final String deleteOnTerminationPattern = "BlockDeviceMapping.%d.Ebs.DeleteOnTermination";
    private static final String volumeIdPattern = "BlockDeviceMapping.%d.Ebs.VolumeId";

    @SuppressWarnings("unchecked")
    @Override
    public <R extends HttpRequest> R bindToRequest(R request, Object input) {
        checkArgument(checkNotNull(input, "input") instanceof Map, "this binder is only valid for Map");
        Map<String, BlockDevice> blockDeviceMapping = (Map<String, BlockDevice>) input;
        Multimap<String, String> original = queryParser().apply(request.getPayload().getRawContent().toString());
        ImmutableMultimap.Builder<String, String> builder = ImmutableMultimap.builder();
        builder.putAll("Action", "ModifyInstanceAttribute");
        int amazonOneBasedIndex = 1; // according to docs, counters must start with 1
        for (Entry<String, BlockDevice> ebsBlockDeviceName : blockDeviceMapping.entrySet()) {
            // not null by contract
            builder.put(format(deviceNamePattern, amazonOneBasedIndex), ebsBlockDeviceName.getKey());
            builder.put(format(deleteOnTerminationPattern, amazonOneBasedIndex),
                    String.valueOf(ebsBlockDeviceName.getValue().isDeleteOnTermination()));
            builder.put(format(volumeIdPattern, amazonOneBasedIndex), ebsBlockDeviceName.getValue().getVolumeId());
            amazonOneBasedIndex++;
        }
        builder.putAll("InstanceId", original.get("InstanceId"));
        request.setPayload(newUrlEncodedFormPayload(builder.build()));
        return request;
    }

}