Example usage for org.apache.commons.collections.iterators EmptyIterator INSTANCE

Introduction

In this page you can find the example usage for org.apache.commons.collections.iterators EmptyIterator INSTANCE.

Prototype

Iterator INSTANCE

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Document

Singleton instance of the iterator.

Usage

From source file:edu.cornell.mannlib.vitro.webapp.dao.jena.EmptyReifier.java

@Override
public ExtendedIterator<Triple> findEither(TripleMatch arg0, boolean arg1) {
    return WrappedIterator.create(EmptyIterator.INSTANCE);
}

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From source file:edu.cornell.mannlib.vitro.webapp.dao.jena.EmptyReifier.java

@Override
public ExtendedIterator<Triple> findExposed(TripleMatch arg0) {
    return WrappedIterator.create(EmptyIterator.INSTANCE);
}

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From source file:com.phoenixst.collections.AbstractSingletonCollection.java

public Iterator iterator() {
    return isEmpty() ? EmptyIterator.INSTANCE : new IteratorImpl(this);
}

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From source file:com.intel.hadoop.graphbuilder.demoapps.wikipedia.linkgraph.LinkGraphTokenizer.java

@Override
public Iterator<Edge<StringType, EmptyType>> getEdges() {
    if (links.isEmpty())
        return EmptyIterator.INSTANCE;

    elist.clear();// w w  w. java 2  s.co  m
    Iterator<String> iter = links.iterator();
    while (iter.hasNext()) {
        elist.add(new Edge<StringType, EmptyType>(new StringType(title), new StringType(iter.next()),
                EmptyType.INSTANCE));
    }
    return elist.iterator();
}

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From source file:com.phoenixst.collections.CartesianProduct.java

/**
 *  Returns an <code>Iterator</code> over the elements of the
 *  product of the specified collections with the left one
 *  controlling the outer loop.  This factory method is preferable
 *  when the left collection is more expensive to use than the
 *  right one.//from   w w w . ja v a  2 s .c  o m
 */
public static final Iterator leftIterator(Collection left, Collection right) {
    if (left == null) {
        throw new IllegalArgumentException("Left operand is null.");
    }
    if (right == null) {
        throw new IllegalArgumentException("Right operand is null.");
    }
    Iterator leftIter = left.iterator();
    // We have to check for this case, because passing an empty
    // right collection to the Iterator constructor would result
    // in incorrect behavior for hasNext() as it is written.  The
    // alternative is a more complex Iterator implementation.
    if (!leftIter.hasNext() || right.isEmpty()) {
        return EmptyIterator.INSTANCE;
    }
    return new LeftIterator(leftIter, right);
}

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From source file:com.bah.culvert.tableadapters.HBaseLocalTableAdapter.java

@Override
public Iterator<Result> get(Get get) {
    // Get the range list
    List<CRange> culvertRangeList = get.getRanges();

    // Only scan the tables if we have a range
    if (culvertRangeList.size() > 0) {

        List<Result> results = new ArrayList<Result>();

        // Get the reference to the HRegion
        HRegion hregion = null;/* www. ja  v a2 s. c  o m*/
        try {
            hregion = ((RegionCoprocessorEnvironment) this.ENDPOINT.getEnvironment()).getRegion();
        } catch (Exception e) {
            throw new RuntimeException(this.getTableName() + " Unable to get HRegion", e);
        }
        try {
            // Loop through the ranges
            for (CRange cr : culvertRangeList) {
                Scan scan = new Scan(cr.getStart(), cr.getEnd());
                // add columns to the scanner
                for (CColumn cc : get.getColumns()) {
                    scan.addColumn(cc.getColumnFamily(), cc.getColumnQualifier());
                }
                InternalScanner scanner = hregion.getScanner(scan);
                try {
                    List<KeyValue> curVals = new ArrayList<KeyValue>();
                    boolean hasMore = false;
                    do {
                        curVals.clear();
                        hasMore = scanner.next(curVals);
                        KeyValue kv = curVals.get(0);
                        results.add(new Result(kv.getRow(), new CKeyValue(kv.getKey(), kv.getFamily(),
                                kv.getQualifier(), kv.getTimestamp(), kv.getValue())));
                    } while (hasMore);
                } finally {
                    scanner.close();
                }
            }
        } catch (IOException e) {
            throw new RuntimeException(this.getTableName() + " Failed to iterate through table", e);
        }

        return results.iterator();
    }
    // There were no ranges in the list, so return an empty iterator
    return EmptyIterator.INSTANCE;
}

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From source file:com.phoenixst.collections.CartesianProduct.java

/**
 *  Returns an <code>Iterator</code> over the elements of the
 *  product of the specified collections with the right one
 *  controlling the outer loop.  This factory method is preferable
 *  when the right collection is more expensive to use than the
 *  left one.//  www  .  ja va2s  .  c om
 */
public static final Iterator rightIterator(Collection left, Collection right) {
    if (left == null) {
        throw new IllegalArgumentException("Left operand is null.");
    }
    if (right == null) {
        throw new IllegalArgumentException("Right operand is null.");
    }
    Iterator rightIter = right.iterator();
    // We have to check for this case, because passing an empty
    // left collection to the Iterator constructor would result
    // in incorrect behavior for hasNext() as it is written.  The
    // alternative is a more complex Iterator implementation.
    if (!rightIter.hasNext() || left.isEmpty()) {
        return EmptyIterator.INSTANCE;
    }
    return new RightIterator(left, rightIter);
}

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From source file:com.modelsolv.kaboom.model.resource.nativeImpl.RDMPropertyCollection.java

@SuppressWarnings("unchecked")
@Override
public Iterator<RDMProperty> iterator() {
    return isEmpty() ? EmptyIterator.INSTANCE : rdmProperties.iterator();
}

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From source file:de.csw.expertfinder.ExpertFinder.java

/**
 * Returns an iterator over all super classes of the class specified by the
 * given uri or an empty iterator if no such class exists or if it has no
 * super classes.//from ww w.  j a  v a 2s  .co  m
 * 
 * @param uri
 * @return an iterator over all super classes of the class specified by the
 *         given uri or an empty iterator if no such class exists or if it
 *         has no super classes.
 */
@SuppressWarnings("unchecked")
public Iterator<OntClass> getSuperClasses(String uri) {
    OntModel model = OntologyIndex.get().getModel();
    OntClass clazz = model.getOntClass(uri);
    if (clazz != null) {
        return clazz.listSuperClasses(true);
    }

    return EmptyIterator.INSTANCE;
}

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From source file:com.intel.hadoop.graphbuilder.demoapps.wikipedia.docwordgraph.WordCountGraphTokenizer.java

@Override
public Iterator<Edge<StringType, StringType>> getEdges() {
    if (counts.isEmpty())
        return EmptyIterator.INSTANCE;

    ArrayList<Edge<StringType, StringType>> elist = new ArrayList<Edge<StringType, StringType>>(counts.size());
    Iterator<Entry<String, Integer>> iter = counts.entrySet().iterator();
    while (iter.hasNext()) {
        Entry<String, Integer> e = iter.next();
        elist.add(new Edge<StringType, StringType>(new StringType(id), new StringType(e.getKey()),
                new StringType(e.getValue().toString())));
    }//from w  ww .  jav a 2 s  .c  o  m
    return elist.iterator();
}

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