Example usage for com.google.common.collect Iterators transform

Introduction

In this page you can find the example usage for com.google.common.collect Iterators transform.

Prototype

public static <F, T> Iterator<T> transform(final Iterator<F> fromIterator,
        final Function<? super F, ? extends T> function)

Source Link

Document

Returns an iterator that applies function to each element of fromIterator .

Usage

From source file:com.google.enterprise.connector.ldap.LdapPersonRepository.java

@Override
public Iterator<LdapPerson> iterator() throws SnapshotRepositoryRuntimeException {
    final Function<JsonDocument, LdapPerson> f = new LoggingFunction();
    return Iterators.transform(personFetcher.iterator(), f);
}

From source file:org.apache.fluo.core.log.TracingColumnScanner.java

@Override
public Iterator<ColumnValue> iterator() {
    return Iterators.transform(cs.iterator(), cv -> {
        log.trace("txid: {} scanId: {} next()-> {} {} {}", txid, scanId, encRow,
                Hex.encNonAscii(cv.getColumn()), Hex.encNonAscii(cv.getValue()));
        return cv;
    });//from w w w  .  ja  va  2  s.c o m
}

From source file:org.apache.crunch.impl.spark.fn.FlatMapPairDoFn.java

@Override
public Iterable<T> call(Iterator<Tuple2<K, V>> input) throws Exception {
    ctxt.initialize(fn, null);//from ww w.ja va2  s.  c o  m
    return new CrunchIterable<Pair<K, V>, T>(fn, Iterators.transform(input, GuavaUtils.<K, V>tuple2PairFunc()));
}

From source file:org.seedstack.seed.web.internal.security.shiro.SimpleFilterChainResolver.java

public FilterChain getChain(ServletRequest request, ServletResponse response, final FilterChain originalChain) {
    String path = WebUtils.getPathWithinApplication(WebUtils.toHttp(request));
    for (final String pathPattern : chains.keySet()) {
        if (patternMatcher.matches(pathPattern, path)) {
            return new SimpleFilterChain(originalChain,
                    Iterators.transform(Iterators.forArray(chains.get(pathPattern)),
                            (Function<ShiroWebModule.FilterKey, Filter>) input -> injector
                                    .getInstance(input.getKey())));
        }/*from w ww .  j  ava2  s.  co m*/
    }
    return null;
}

From source file:org.apache.mahout.fpm.pfpgrowth.convertors.TransactionIterator.java

public TransactionIterator(Iterator<Pair<List<T>, Long>> transactions,
        final Map<T, Integer> attributeIdMapping) {
    transactionBuffer = new int[attributeIdMapping.size()];
    delegate = Iterators.transform(transactions, new Function<Pair<List<T>, Long>, Pair<int[], Long>>() {
        @Override/*www . j  a va2s  .  c o m*/
        public Pair<int[], Long> apply(Pair<List<T>, Long> from) {
            int index = 0;
            if (from == null) {
                return null;
            }
            for (T attribute : from.getFirst()) {
                if (attributeIdMapping.containsKey(attribute)) {
                    transactionBuffer[index++] = attributeIdMapping.get(attribute);
                }
            }
            int[] transactionList = new int[index];
            System.arraycopy(transactionBuffer, 0, transactionList, 0, index);
            return new Pair<int[], Long>(transactionList, from.getSecond());
        }
    });
}

From source file:com.palantir.atlasdb.keyvalue.impl.RowResults.java

public static <T> Iterator<RowResult<T>> viewOfEntries(
        Iterator<Map.Entry<byte[], SortedMap<byte[], T>>> mapEntries) {
    Function<Entry<byte[], SortedMap<byte[], T>>, RowResult<T>> f = createRowResultFunction();
    return Iterators.transform(mapEntries, f);
}

From source file:com.cg.mapreduce.fpgrowth.mahout.fpm.convertors.TransactionIterator.java

public TransactionIterator(Iterator<Pair<List<T>, Long>> transactions,
        final Map<T, Integer> attributeIdMapping) {
    transactionBuffer = new int[attributeIdMapping.size()];
    delegate = Iterators.transform(transactions, new Function<Pair<List<T>, Long>, Pair<int[], Long>>() {
        @Override//from www  .  j a v  a  2  s .  c  om
        public Pair<int[], Long> apply(Pair<List<T>, Long> from) {
            if (from == null) {
                return null;
            }
            int index = 0;
            for (T attribute : from.getFirst()) {
                if (attributeIdMapping.containsKey(attribute)) {
                    transactionBuffer[index++] = attributeIdMapping.get(attribute);
                }
            }
            int[] transactionList = new int[index];
            System.arraycopy(transactionBuffer, 0, transactionList, 0, index);
            return new Pair<int[], Long>(transactionList, from.getSecond());
        }
    });
}

From source file:com.anjuke.romar.mahout.similarity.file.RomarFileSimilarityIterator.java

private RomarFileSimilarityIterator(DataFileIterator fileIterator, final SimilarityBuilder<T> builder) {
    _delegate = Iterators.transform(fileIterator, new Function<byte[], T>() {
        public T apply(byte[] input) {
            ByteBuffer buffer = ByteBuffer.wrap(input);
            return builder.create(buffer.getLong(), buffer.getLong(), buffer.getDouble());
        }//from   w w  w  .  j a va2s .c o m
    });
}

From source file:org.apache.fluo.core.log.TracingCellScanner.java

@Override
public Iterator<RowColumnValue> iterator() {
    return Iterators.transform(wrappedScanner.iterator(), rcv -> {
        log.trace("txid: {} scanId: {} next()-> {} {}", txid, scanId, Hex.encNonAscii(rcv.getRowColumn()),
                Hex.encNonAscii(rcv.getValue()));
        return rcv;
    });/*from  w  w w. j  a v  a2  s . c om*/
}

From source file:org.apache.parquet.cli.json.AvroJsonReader.java

public AvroJsonReader(InputStream stream, Schema schema) {
    this.stream = stream;
    this.schema = schema;
    this.model = GenericData.get();
    this.iterator = Iterators.transform(AvroJson.parser(stream), new Function<JsonNode, E>() {
        @Override//from   ww  w  . j  a  v  a  2  s .c  om
        @SuppressWarnings("unchecked")
        public E apply(@Nullable JsonNode node) {
            return (E) AvroJson.convertToAvro(model, node, AvroJsonReader.this.schema);
        }
    });
}