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    • org.javabits.yar.guice.CollectionsRegistryAnnotatedBindingBuilderImpl Maven / Gradle / Ivy

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    /*
 * Copyright 2013 Romain Gilles
 *
 *    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.javabits.yar.guice;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.reflect.TypeToken;
import com.google.inject.Binder;
import com.google.inject.Inject;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import org.javabits.yar.Ids;
import org.javabits.yar.Registry;
import org.javabits.yar.Supplier;

import javax.annotation.Nullable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static java.util.Objects.requireNonNull;

/**
 * TODO comment
 * Date: 3/12/13
 * Time: 9:25 AM
 *
 * @author Romain Gilles
 */
public class CollectionsRegistryAnnotatedBindingBuilderImpl extends RegistryAnnotatedBindingBuilderImpl {
    public CollectionsRegistryAnnotatedBindingBuilderImpl(Binder binder, Key key) {
        super(binder, key);
    }

    public CollectionsRegistryAnnotatedBindingBuilderImpl(Binder binder, TypeLiteral typeLiteral) {
        super(binder, typeLiteral);
    }

    @Override
    RegistryProvider newRegistryProvider() {
        return new CollectionsRegistryProvider<>(key(), isLaxTypeBinding());
    }

    @Override
    RegistryProvider newRegistryProvider(long timeout, TimeUnit unit) {
        return newRegistryProvider();
    }

    private static class CollectionsRegistryProvider implements RegistryProvider {
        private final boolean laxTypeBinding;
        private final Key key;
        private Registry registry;
        private CollectionsRegistryProvider(Key key, boolean laxTypeBinding) {
            this.key = key;
            this.laxTypeBinding = laxTypeBinding;
        }

        @Override
        @SuppressWarnings("unchecked")
        public T get() {
            return (T) Lists.transform(getAll(), new Function, Object>() {
                @Nullable
                @Override
                public Object apply(@Nullable Supplier input) {
                    if (input == null) {
                        return null;
                    }
                    return input.get();
                }
            });
        }

        private List getAll() {
            if (laxTypeBinding) {
                return registry().getAll(TypeToken.of(getCollectionsTypeParameter()));
            } else {
                return registry().getAll(Ids.newId(getCollectionsTypeParameter()));
            }
        }

        @SuppressWarnings("unchecked")
        private Type getCollectionsTypeParameter() {
            Type type = key.getTypeLiteral().getType();
            checkParameterizedType(type);
            ParameterizedType parameterizedType = (ParameterizedType) type;
            Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
            if (actualTypeArguments.length != 1) {
                throw new IllegalArgumentException("Supplier type must be mono parameterized: " + type);
            }

            return actualTypeArguments[0];
        }

        Registry registry() {
            return requireNonNull(registry, "registry");
        }

        @Inject
        public void setRegistry(Registry registry) {
            this.registry = registry;
        }


        @Override
        public void noWait() {
            //nothing to do here not relevant in this case
        }
    }

    static void checkParameterizedType(Type type) {
        if (isNotParameterizedType(type)) {
            throw new IllegalArgumentException("Supplier type must be parameterized: " + type);
        }
    }

    static boolean isNotParameterizedType(Type type) {
        return !(type instanceof ParameterizedType);
    }

}
    
    
    
    

    




    
    
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