org.jclouds.nodepool.config.BindJcloudsModules.java Source code

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Here is the source code for org.jclouds.nodepool.config.BindJcloudsModules.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.nodepool.config;

import java.util.Set;

import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.nodepool.Backend;

import com.google.common.base.Function;
import com.google.common.base.Splitter;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.inject.Module;
import com.google.inject.PrivateModule;
import com.google.inject.Provides;

public class BindJcloudsModules extends PrivateModule {

    @Override
    protected void configure() {
    }

    @Provides
    @Singleton
    @Backend
    protected Set<Module> provideBackendModules(@Named(NodePoolProperties.BACKEND_MODULES) String moduleString) {
        return ImmutableSet
                .copyOf(Iterables.transform(Splitter.on(',').split(moduleString), new Function<String, Module>() {

                    @Override
                    public Module apply(String input) {
                        try {
                            return Module.class.cast(Class.forName(input).newInstance());
                        } catch (InstantiationException e) {
                            throw Throwables.propagate(e);
                        } catch (IllegalAccessException e) {
                            throw Throwables.propagate(e);
                        } catch (ClassNotFoundException e) {
                            throw Throwables.propagate(e);
                        }
                    }
                }));
    }
}