ch.systemsx.cisd.openbis.generic.server.business.bo.samplelister.SampleSetListingQueryFullTableScan.java Source code

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Here is the source code for ch.systemsx.cisd.openbis.generic.server.business.bo.samplelister.SampleSetListingQueryFullTableScan.java

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/*
 * Copyright 2009 ETH Zuerich, CISD
 *
 * 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 ch.systemsx.cisd.openbis.generic.server.business.bo.samplelister;

import it.unimi.dsi.fastutil.longs.LongSet;

import java.util.Iterator;

import org.apache.commons.collections15.Predicate;
import org.apache.commons.collections15.iterators.FilterIterator;

import ch.rinn.restrictions.Friend;

/**
 * An implementation of {@link ISampleSetListingQuery} which gets all all rows and then filters them
 * down by sample id. This will be a faster way of getting the samples then getting them one by one
 * (as {@link SampleSetListingQueryOneByOne} does) when a the requested samples are a considerable
 * part of all samples.
 * 
 * @author Bernd Rinn
 */
@Friend(toClasses = { SampleRecord.class, ISampleListingQuery.class })
class SampleSetListingQueryFullTableScan implements ISampleSetListingQuery {
    private final long databaseInstanceId;

    private final ISampleListingQuery query;

    public SampleSetListingQueryFullTableScan(final ISampleListingQuery query, final long databaseInstanceId) {
        this.query = query;
        this.databaseInstanceId = databaseInstanceId;
    }

    public Iterable<SampleRecord> getSamples(final LongSet sampleIds) {
        return new Iterable<SampleRecord>() {
            public Iterator<SampleRecord> iterator() {
                return new FilterIterator<SampleRecord>(query.getSamples(databaseInstanceId),
                        new Predicate<SampleRecord>() {
                            public boolean evaluate(SampleRecord sample) {
                                return sampleIds.contains(sample.id);
                            }
                        });
            }
        };
    }

}