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HttpClient-based client for Riak

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/*
 * Copyright 2013 Basho Technologies Inc
 *
 * 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.basho.riak.client.api.commands.search;

import com.basho.riak.client.api.RiakCommand;
import com.basho.riak.client.api.commands.CoreFutureAdapter;
import com.basho.riak.client.core.RiakCluster;
import com.basho.riak.client.core.RiakFuture;
import com.basho.riak.client.core.operations.YzGetSchemaOperation;


/**
 * Command used to fetch a search schema from Riak.
 * @author Dave Rusek 
 * @since 2.0
 */
public final class FetchSchema extends RiakCommand
{
	private final String schema;

	FetchSchema(Builder builder)
	{
		this.schema = builder.schema;
	}

	@Override
    protected RiakFuture executeAsync(RiakCluster cluster)
    {
        RiakFuture coreFuture =
            cluster.execute(buildCoreOperation());
        
        CoreFutureAdapter future =
            new CoreFutureAdapter(coreFuture)
            {
                @Override
                protected YzGetSchemaOperation.Response convertResponse(YzGetSchemaOperation.Response coreResponse)
                {
                    return coreResponse;
                }

                @Override
                protected String convertQueryInfo(String coreQueryInfo)
                {
                    return coreQueryInfo;
                }
            };
        coreFuture.addListener(future);
        return future;
    }
    
    private YzGetSchemaOperation buildCoreOperation()
    {
        return new YzGetSchemaOperation.Builder(schema).build();
    }

    /**
     * Builder for a FetchSchema command.
     */
	public static class Builder
	{
		private final String schema;

        /**
         * Construct a Builder for a FetchSchema command.
         *
         * @param schema The name of the schema to fetch.
         */
		public Builder(String schema)
		{
			this.schema = schema;
		}

        /**
         * Construct the FetchSchema command.
         * @return the new FetchSchema command.
         */
		public FetchSchema build()
		{
			return new FetchSchema(this);
		}
	}
}