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package net.java.ao.schema;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import net.java.ao.RawEntity;

import java.util.Objects;


/**
 * A table name converter that simply caches the converted table names.
 * This implementation uses a {@link com.google.common.cache.LoadingCache} and is thread safe.
 *
 * @since 0.9
 */
public class CachingTableNameConverter implements TableNameConverter {
    private final LoadingCache>, String> cache;

    public CachingTableNameConverter(final TableNameConverter delegateTableNameConverter) {
        Objects.requireNonNull(delegateTableNameConverter, "delegateTableNameConverter can't be null");
        this.cache = CacheBuilder.newBuilder().build(new CacheLoader>, String>() {
            @Override
            public String load(final Class> key) throws Exception {
                return delegateTableNameConverter.getName(key);
            }
        });
    }

    public String getName(Class> entityClass) {
        return cache.getUnchecked(entityClass);
    }
}