org.jclouds.compute.ComputeServiceContextBuilder.java Source code

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Here is the source code for org.jclouds.compute.ComputeServiceContextBuilder.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.compute;

import java.util.Properties;

import org.jclouds.compute.config.ResolvesImages;
import org.jclouds.compute.internal.ComputeServiceContextImpl;
import org.jclouds.rest.RestContextBuilder;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.util.Types;

/**
 * @author Adrian Cole
 */
public abstract class ComputeServiceContextBuilder<S, A> extends RestContextBuilder<S, A> {

    public ComputeServiceContextBuilder(Class<S> syncClientType, Class<A> asyncClientType) {
        this(syncClientType, asyncClientType, new Properties());
    }

    public ComputeServiceContextBuilder(Class<S> syncClientType, Class<A> asyncClientType, Properties properties) {
        super(syncClientType, asyncClientType, properties);

    }

    @Override
    public Injector buildInjector() {
        addImageResolutionModuleIfNotPresent();
        return super.buildInjector();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ComputeServiceContextBuilder<S, A> withModules(Iterable<Module> modules) {
        return (ComputeServiceContextBuilder<S, A>) super.withModules(modules);
    }

    public ComputeServiceContext buildComputeServiceContext() {
        // need the generic type information
        return (ComputeServiceContext) buildInjector().getInstance(Key
                .get(Types.newParameterizedType(ComputeServiceContextImpl.class, syncClientType, asyncClientType)));
    }

    protected void addImageResolutionModuleIfNotPresent() {
        if (!Iterables.any(modules, new Predicate<Module>() {
            public boolean apply(Module input) {
                return input.getClass().isAnnotationPresent(ResolvesImages.class);
            }

        })) {
            addImageResolutionModule();
        }
    }

    protected void addImageResolutionModule() {
        // do nothing;
        // this is to be overridden when needed
    }
}