org.jclouds.util.Modules2.java Source code

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Here is the source code for org.jclouds.util.Modules2.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * 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.jclouds.util;

import static com.google.common.base.Splitter.on;
import static com.google.common.collect.Iterables.concat;
import static com.google.common.collect.Iterables.transform;

import java.util.Properties;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Module;

/**
 * 
 * 
 * @author Adrian Cole
 */
public class Modules2 {

    public static Iterable<Module> modulesFromCommaDelimitedString(String moduleClasses) {
        Iterable<Module> modules = ImmutableSet.of();
        if (moduleClasses != null) {
            Iterable<String> transformer = ImmutableList.copyOf(on(',').split(moduleClasses));
            modules = transform(transformer, new Function<String, Module>() {

                @Override
                public Module apply(String from) {
                    try {
                        return (Module) Class.forName(from).newInstance();
                    } catch (InstantiationException e) {
                        throw new RuntimeException("error instantiating " + from, e);
                    } catch (IllegalAccessException e) {
                        throw new RuntimeException("error instantiating " + from, e);
                    } catch (ClassNotFoundException e) {
                        throw new RuntimeException("error instantiating " + from, e);
                    }
                }

            });
        }
        return modules;
    }

    public static Iterable<Module> modulesForProviderInProperties(String providerName, Properties props) {
        return concat(modulesFromProperty(props, "jclouds.modules"),
                modulesFromProperty(props, providerName + ".modules"));
    }

    public static Iterable<Module> modulesFromProperty(Properties props, String property) {
        return modulesFromCommaDelimitedString(props.getProperty(property, null));
    }

}