com.expedia.seiso.domain.repo.adapter.SimpleItemRepoAdapter.java Source code

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Here is the source code for com.expedia.seiso.domain.repo.adapter.SimpleItemRepoAdapter.java

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/* 
 * Copyright 2013-2015 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.expedia.seiso.domain.repo.adapter;

import java.lang.reflect.Method;

import lombok.NonNull;
import lombok.val;

import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.support.Repositories;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;

import com.expedia.seiso.domain.entity.Item;
import com.expedia.seiso.domain.entity.key.ItemKey;
import com.expedia.seiso.domain.entity.key.SimpleItemKey;
import com.expedia.seiso.domain.meta.ItemMetaLookup;

/**
 * Repo adapter for single-key entities. There is a single adapter instance spanning all such repos, as opposed to each
 * such repo getting its own adapter instance.
 * 
 * @author Willie Wheeler
 */
@Component
public class SimpleItemRepoAdapter implements RepoAdapter {
    private ItemMetaLookup itemMetaLookup;
    private Repositories repositories;

    public SimpleItemRepoAdapter(@NonNull ItemMetaLookup itemMetaLookup, @NonNull Repositories repositories) {
        this.itemMetaLookup = itemMetaLookup;
        this.repositories = repositories;
    }

    @Override
    public boolean supports(@NonNull Class<?> itemClass) {
        return getFindByKeyMethod(itemClass) != null;
    }

    @Override
    public Item find(@NonNull ItemKey key) {
        val itemClass = key.getItemClass();
        val findByKeyMethod = getFindByKeyMethod(itemClass);
        val repo = (CrudRepository) repositories.getRepositoryFor(itemClass);
        val simpleItemKey = (SimpleItemKey) key;
        return (Item) ReflectionUtils.invokeMethod(findByKeyMethod, repo, simpleItemKey.getValue());
    }

    @Override
    public void delete(@NonNull ItemKey key) {
        val itemClass = key.getItemClass();
        val repo = (CrudRepository) repositories.getRepositoryFor(itemClass);
        val item = find(key);
        if (item != null) {
            repo.delete(item);
        }
    }

    private Method getFindByKeyMethod(Class<?> itemClass) {
        val itemMeta = itemMetaLookup.getItemMeta(itemClass);
        return itemMeta.getRepositoryFindByKeyMethod();
    }
}