org.grails.datastore.mapping.riak.collection.RiakEntityIndex.java Source code

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Here is the source code for org.grails.datastore.mapping.riak.collection.RiakEntityIndex.java

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/*
 * Copyright (c) 2010 by J. Brisbin <jon@jbrisbin.com>
 *     Portions (c) 2010 by NPC International, Inc. or the
 *     original author(s).
 *
 * 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 org.grails.datastore.mapping.riak.collection;

import java.util.AbstractList;
import java.util.List;
import java.util.Map;

import org.springframework.data.keyvalue.riak.core.RiakTemplate;
import org.springframework.data.keyvalue.riak.mapreduce.JavascriptMapReduceOperation;
import org.springframework.data.keyvalue.riak.mapreduce.MapReduceJob;
import org.springframework.data.keyvalue.riak.mapreduce.MapReduceOperation;
import org.springframework.data.keyvalue.riak.mapreduce.MapReducePhase;
import org.springframework.data.keyvalue.riak.mapreduce.RiakMapReduceJob;
import org.springframework.data.keyvalue.riak.mapreduce.RiakMapReducePhase;

/**
 * @author J. Brisbin <jon@jbrisbin.com>
 */
@SuppressWarnings({ "hiding", "rawtypes" })
public class RiakEntityIndex<Long> extends AbstractList implements List, RiakCollection {

    private RiakTemplate riakTemplate;
    private String bucket;

    public RiakEntityIndex(RiakTemplate riakTemplate, String bucket) {
        this.riakTemplate = riakTemplate;
        this.bucket = bucket;
    }

    @Override
    public Object get(int i) {
        return riakTemplate.execute(createFetchAtJob(i), Map.class);
    }

    @Override
    public int size() {
        return riakTemplate.execute(createCountJob(), Integer.class);
    }

    @Override
    public boolean isEmpty() {
        return size() == 0;
    }

    public String getBucket() {
        return bucket;
    }

    private MapReduceJob createFetchAtJob(int i) {
        MapReduceJob mapReduceJob = new RiakMapReduceJob(riakTemplate);
        MapReduceOperation mapJs = new JavascriptMapReduceOperation(
                "function(values){ var row=Riak.mapValuesJson(values); return [row]; }");
        MapReducePhase mapPhase = new RiakMapReducePhase(MapReducePhase.Phase.MAP, "javascript", mapJs);
        mapReduceJob.addPhase(mapPhase);
        MapReduceOperation reduceJs = new JavascriptMapReduceOperation(
                String.format("function(values){ return values[%s]; }", i));
        MapReducePhase reducePhase = new RiakMapReducePhase(MapReducePhase.Phase.REDUCE, "javascript", reduceJs);
        mapReduceJob.addPhase(reducePhase);

        return mapReduceJob;
    }

    private MapReduceJob createCountJob() {
        MapReduceJob mapReduceJob = new RiakMapReduceJob(riakTemplate);
        MapReduceOperation mapJs = new JavascriptMapReduceOperation(
                "function(values){ var row=Riak.mapValuesJson(values); return [row]; }");
        MapReducePhase mapPhase = new RiakMapReducePhase(MapReducePhase.Phase.MAP, "javascript", mapJs);
        mapReduceJob.addPhase(mapPhase);
        MapReduceOperation reduceJs = new JavascriptMapReduceOperation("function(values){ return values.length; }");
        MapReducePhase reducePhase = new RiakMapReducePhase(MapReducePhase.Phase.REDUCE, "javascript", reduceJs);
        mapReduceJob.addPhase(reducePhase);

        return mapReduceJob;
    }
}