com.github.yongchristophertang.database.guice.provider.AnnotationClientFactory.java Source code

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/*
 * Copyright 2014-2015 the original author or authors.
 *
 * 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 com.github.yongchristophertang.database.guice.provider;

import com.google.common.collect.Lists;

import java.util.Queue;
import java.util.stream.Collectors;

/**
 * Default implementation of {@link ClientFactory} for creating clients from {@link java
 * .lang.annotation.Annotation}s as {@code annos}.
 *
 * @author Yong Tang
 * @since 0.4
 */
public abstract class AnnotationClientFactory<T, A> implements ClientFactory<T> {
    private final A[] annos;
    private final Queue<T> clients;

    AnnotationClientFactory(A[] annos) {
        this.annos = annos;
        clients = Lists.newLinkedList(
                Lists.newArrayList(annos).stream().map(this::createClient).collect(Collectors.toList()));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Queue<T> buildClients() {
        return clients;
    }

    /**
     * Transfer an annotation to a T object.
     */
    abstract protected T createClient(A anno);
}