import java.util.Iterator;



import javax.xml.XMLConstants;

import javax.xml.namespace.NamespaceContext;



// Map prefixes to Namespace URIs

public class APINameSpaceContext implements NamespaceContext 

{

   static final String WEB_NAMESPACE =  "http://schemas.microsoft.com/LiveSearch/2008/04/XML/web";

   static final String API_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/element";

   static final String SPELL_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/spell";

   static final String RS_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/relatedsearch";

   static final String PB_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/phonebook";

   static final String MM_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/multimedia";

   static final String AD_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/ads";

   static final String IA_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/instantanswer";

   static final String NEWS_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/news";

   static final String ENCARTA_NAMESPACE = "http://schemas.microsoft.com/LiveSearch/2008/04/XML/encarta";



   public String getNamespaceURI(String prefix) 

   {

      if (prefix == null) throw new NullPointerException("Null prefix");

      else if ("api".equals(prefix)) return API_NAMESPACE;

      else if ("web".equals(prefix)) return WEB_NAMESPACE;

      return XMLConstants.NULL_NS_URI;

   }

   

   // This method isn't necessary for XPath processing.

   public String getPrefix(String uri) 

   {

      throw new UnsupportedOperationException();

   }

   

   public Iterator getPrefixes(String arg0) 

   {

      throw new UnsupportedOperationException();

   }

}

public Stream<String> lines() {

        Iterator<String> iter = new Iterator<String>() {

            String nextLine = null;



            @Override

            public boolean hasNext() {

                if (nextLine != null) {

                    return true;

                } else {

                    try {

                        nextLine = readLine();

                        return (nextLine != null);

                    } catch (IOException e) {

                        throw new UncheckedIOException(e);

                    }

                }

            }



            @Override

            public String next() {

                if (nextLine != null || hasNext()) {

                    String line = nextLine;

                    nextLine = null;

                    return line;

                } else {

                    throw new NoSuchElementException();

                }

            }

        };

        return StreamSupport.stream(Spliterators.spliteratorUnknownSize(

                iter, Spliterator.ORDERED | Spliterator.NONNULL), false);

    }

    public void validateRangeIterators() {

        SortedRangeSet srs1 = new SortedRangeSet("1-10");

        Iterator i1 = srs1.rangeIterator();

        assert i1.hasNext() : "We should have one Range instance in our iterator.";

        assert ((Range) i1.next()).toRepresentation().equals("1-10");

        assert !i1.hasNext() : "There should be only one instance in our iterator.";

        SortedRangeSet srs2 = new SortedRangeSet("1-5,8,10-15");

        Iterator i2 = srs2.rangeIterator();

        assert i2.hasNext() && i2.next() instanceof Range

            && i2.hasNext() && i2.next() instanceof Range

            && i2.hasNext() && i2.next() instanceof Range

            && !i2.hasNext() : "There should be exactly three Range instances in our iterator.";

        SortedRangeSet srs3 = new SortedRangeSet("");

        assert !srs3.iterator().hasNext() : "Iterator should be empty.";

    }