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package com.basho.riak.client.api.commands.mapreduce;

import com.basho.riak.client.core.query.Namespace;
import com.basho.riak.client.api.commands.mapreduce.filters.KeyFilter;

import java.util.ArrayList;
import java.util.List;

/**
 * Command used to perform a Map Reduce operation over a bucket in Riak.
 * @author Dave Rusek 
 * @since 2.0
 */
public class BucketMapReduce extends MapReduce
{
    protected BucketMapReduce(BucketInput input, Builder builder)
    {
        super(input, builder);
    }

    /**
     * Builder for a BucketMapReduce command.
     */
    public static class Builder extends MapReduce.Builder
    {
        private Namespace namespace;
        private final List filters = new ArrayList<>();

        @Override
        protected Builder self()
        {
            return this;
        }

        public Builder withNamespace(Namespace namespace)
        {
            this.namespace = namespace;
            return this;
        }

        public Builder withKeyFilter(KeyFilter filter)
        {
            filters.add(filter);
            return this;
        }

        public BucketMapReduce build()
        {
            if (namespace == null)
            {
                throw new IllegalStateException("A Namespace must be specified");
            }

            return new BucketMapReduce(new BucketInput(namespace, filters), this);
        }
    }
}