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package eu.dnetlib.data.mapreduce.util;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import com.google.common.collect.Maps;
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import org.apache.hadoop.hbase.util.Bytes;
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import org.apache.hadoop.mapreduce.Mapper.Context;
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import com.google.common.collect.Lists;
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import com.google.protobuf.InvalidProtocolBufferException;
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import eu.dnetlib.data.proto.OafProtos.Oaf;
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import eu.dnetlib.data.transform.OafEntityMerger;
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public class UpdateMerger {
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private static final String UPDATE_MERGER = "UPDATE_MERGE";
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private static final String N_MERGES = "N_MERGES";
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@SuppressWarnings("rawtypes")
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public static Oaf mergeBodyUpdates(final Context context, final Map<byte[], byte[]> map) throws InvalidProtocolBufferException {
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final Map<String, byte[]> stringMap = Maps.newHashMap();
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for(Entry<byte[], byte[]> e : map.entrySet()) {
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stringMap.put(Bytes.toString(e.getKey()), e.getValue());
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}
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return doMerge(context, stringMap);
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}
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public static Oaf mergeBodyUpdates(final Map<String, byte[]> map) throws InvalidProtocolBufferException {
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return doMerge(null, map);
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}
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private static Oaf doMerge(final Context context, final Map<String, byte[]> map)
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throws InvalidProtocolBufferException {
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final byte[] value = map.get(DedupUtils.BODY_S);
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if (value == null) return null;
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Oaf.Builder builder = Oaf.newBuilder(Oaf.parseFrom(value));
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final List<String> keys = Lists.newArrayList();
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// we fetch all the body updates
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for (final String o : map.keySet()) {
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if (o.startsWith("update_")) {
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keys.add(o);
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}
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}
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if (!keys.isEmpty()) {
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// we merge all the sorted updates with the body
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Collections.sort(keys);
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for (final String k : keys) {
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final Oaf update = Oaf.parseFrom(map.get(k));
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// System.out.println("\n\nBODY: \n" + body.build().toString());
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// System.out.println("UPDATE: \n" + update.toString());
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builder.mergeFrom(update);
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// System.out.println("UDPATED BODY: \n" + body.build().toString() + "\n\n");
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}
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builder = OafEntityMerger.merge(builder);
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if (context != null) {
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context.getCounter(UPDATE_MERGER, N_MERGES).increment(keys.size());
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}
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}
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return builder.build();
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}
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}
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