de.micromata.genome.db.jpa.history.impl.CollectionPropertyConverter.java Source code

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Here is the source code for de.micromata.genome.db.jpa.history.impl.CollectionPropertyConverter.java

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//
// Copyright (C) 2010-2016 Micromata GmbH
//
// 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 de.micromata.genome.db.jpa.history.impl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;

import de.micromata.genome.db.jpa.history.api.HistProp;
import de.micromata.genome.db.jpa.history.api.HistoryPropertyConverter;
import de.micromata.genome.jpa.DbRecord;
import de.micromata.genome.jpa.IEmgr;
import de.micromata.genome.jpa.metainf.ColumnMetadata;
import de.micromata.genome.jpa.metainf.EntityMetadata;

/**
 * Converts a collection of Dbrecords.
 * 
 * @author Roger Rene Kommer (r.kommer.extern@micromata.de)
 *
 */
public class CollectionPropertyConverter implements HistoryPropertyConverter {
    private static final Logger LOG = Logger.getLogger(CollectionPropertyConverter.class);

    @Override
    public List<HistProp> convert(IEmgr<?> emgr, HistoryMetaInfo historyMetaInfo, Object entity,
            ColumnMetadata pd) {
        Collection<?> col = (Collection<?>) pd.getGetter().get(entity);
        if (col == null) {
            return Collections.emptyList();
        }
        EntityMetadata targetEntity = pd.getTargetEntity();
        if (col.isEmpty() == true) {
            HistProp hp = new HistProp();
            hp.setName("");
            if (targetEntity != null) {
                hp.setType(targetEntity.getJavaType().getName());
            } else {
                hp.setType(col.getClass().getName());
            }
            hp.setValue("");
            return Collections.singletonList(hp);
        }

        if (targetEntity != null) {
            List<Object> pks = new ArrayList<>();
            for (Object ob : col) {
                Object pk = targetEntity.getIdColumn().getGetter().get(ob);
                if (pk == null) {
                    LOG.warn("Unsaved entity in history");
                    return Collections.emptyList();
                }
                pks.add(pk);
            }
            String sval = StringUtils.join(pks, ',');
            HistProp hp = new HistProp();
            hp.setName("");
            hp.setType(targetEntity.getJavaType().getName());
            hp.setValue(sval);
            return Collections.singletonList(hp);
        }

        Map<Long, Class<?>> pkSet = new TreeMap<>();
        int idx = 0;

        for (Object ob : col) {

            if ((ob instanceof DbRecord) == false) {
                LOG.warn("Cannot create collection history on non DbRecord: " + entity.getClass().getName() + "."
                        + pd.getName() + "[" + idx + "]" + ob.getClass().getName());
                continue;
            }
            DbRecord<?> rec = (DbRecord<?>) ob;
            Long lp = rec.getPkAsLong();
            if (lp == null) {
                LOG.warn("History; Unsafed PK in history: " + entity.getClass().getName() + "." + pd.getName() + "["
                        + idx + "]" + ob.getClass().getName());
                continue;
            }
            pkSet.put(lp, ob.getClass());
            ++idx;
        }
        idx = 0;
        List<HistProp> hpret = new ArrayList<>();
        for (Map.Entry<Long, Class<?>> me : pkSet.entrySet()) {
            HistProp hp = new HistProp();
            hp.setName(me.getValue().toString());
            hp.setType(col.getClass().getName() + "<" + me.getValue().getName() + ">");
            hp.setValue(me.getValue().toString());
            hpret.add(hp);
            ++idx;
        }
        return hpret;
    }

}