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jclouds components to access compute providers

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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.compute.functions;

import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import javax.inject.Singleton;

import org.jclouds.compute.options.TemplateOptions;
import org.jclouds.scriptbuilder.InitScript;
import org.jclouds.scriptbuilder.domain.Statement;
import org.jclouds.scriptbuilder.domain.StatementList;
import org.jclouds.scriptbuilder.statements.ssh.AuthorizeRSAPublicKeys;
import org.jclouds.scriptbuilder.statements.ssh.InstallRSAPrivateKey;

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

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class TemplateOptionsToStatement implements Function {

   @Override
   public Statement apply(TemplateOptions options) {
      List bootstrap = newArrayList();
      if (options.getPublicKey() != null)
         bootstrap.add(new AuthorizeRSAPublicKeys(ImmutableSet.of(options.getPublicKey())));
      if (options.getRunScript() != null)
         bootstrap.add(options.getRunScript());
      if (options.getPrivateKey() != null)
         bootstrap.add(new InstallRSAPrivateKey(options.getPrivateKey()));
      if (bootstrap.size() >= 1) {
         if (options.getTaskName() == null && !(options.getRunScript() instanceof InitScript))
            options.nameTask("bootstrap");
         return bootstrap.size() == 1 ? bootstrap.get(0) : new StatementList(bootstrap);
      }
      return null;
   }

}