com.b2international.snowowl.snomed.importer.rf2.util.EffectiveTimeBaseTransactionAggregatorSupplier.java Source code

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Here is the source code for com.b2international.snowowl.snomed.importer.rf2.util.EffectiveTimeBaseTransactionAggregatorSupplier.java

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/*
 * Copyright 2011-2015 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * 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.b2international.snowowl.snomed.importer.rf2.util;

import java.util.concurrent.atomic.AtomicReference;

import org.eclipse.emf.cdo.transaction.CDOTransaction;

import com.b2international.commons.collections.MutableSupplier;
import com.b2international.snowowl.datastore.cdo.CDOTransactionAggregator;
import com.b2international.snowowl.datastore.cdo.CDOUtils;
import com.b2international.snowowl.datastore.cdo.ICDOTransactionAggregator;
import com.google.common.base.Strings;

/**
 * Supplies {@link CDOTransactionAggregator transaction aggregator} based on SNOMED CT specific effective times.
 */
public class EffectiveTimeBaseTransactionAggregatorSupplier
        extends MutableSupplier<String, ICDOTransactionAggregator> {

    private ICDOTransactionAggregator aggregator;

    public EffectiveTimeBaseTransactionAggregatorSupplier(final CDOTransaction transaction) {
        super(new AtomicReference<String>());
        aggregator = CDOTransactionAggregator.create(CDOUtils.check(transaction));
    }

    /* (non-Javadoc)
     * @see com.b2international.commons.collections.ISupplier2#get(java.lang.Object)
     */
    @Override
    public ICDOTransactionAggregator get(final String from) {

        if (Strings.nullToEmpty(getValue()).equals(from)) {

            return aggregator;

        } else {

            set(from);
            aggregator = CDOTransactionAggregator.create(aggregator);
            return aggregator;

        }

    }

}