// This file was automatically generated with the command: 

 //     java org.galagosearch.tupleflow.typebuilder.TypeBuilderMojo ...

 package org.galagosearch.core.types;

 import org.galagosearch.tupleflow.Utility;

 import org.galagosearch.tupleflow.ArrayInput;

 import org.galagosearch.tupleflow.ArrayOutput;

 import org.galagosearch.tupleflow.Order;   

 import org.galagosearch.tupleflow.OrderedWriter;

 import org.galagosearch.tupleflow.Type; 

 import org.galagosearch.tupleflow.TypeReader;

 import org.galagosearch.tupleflow.Step; 

 import org.galagosearch.tupleflow.IncompatibleProcessorException;

 import org.galagosearch.tupleflow.ReaderSource;

 import java.io.IOException;             

 import java.io.EOFException;

 import java.io.UnsupportedEncodingException;

 import java.util.ArrayList;

 import java.util.Arrays;   

 import java.util.Comparator;

 import java.util.PriorityQueue;

 import java.util.Collection;

 public class NumberedLink implements Type<NumberedLink> {

     public long source;

     public long destination; 

     public NumberedLink() {}

     public NumberedLink(long source, long destination) {

         this.source = source;

         this.destination = destination;

     }  

     public String toString() {

             return String.format("%d,%d",

                                    source, destination);

     } 

     public Order<NumberedLink> getOrder(String... spec) {

         if (Arrays.equals(spec, new String[] { "+source" })) {

             return new SourceOrder();

         }

         if (Arrays.equals(spec, new String[] { "+destination" })) {

             return new DestinationOrder();

         }

         return null;

     } 

     public interface Processor extends Step, org.galagosearch.tupleflow.Processor<NumberedLink> {

         public void process(NumberedLink object) throws IOException;

         public void close() throws IOException;

     }                        

     public interface Source extends Step {

     }

     public static class SourceOrder implements Order<NumberedLink> {

         public int hash(NumberedLink object) {

             int h = 0;

             h += Utility.hash(object.source);

             return h;

         } 

         public Comparator<NumberedLink> greaterThan() {

             return new Comparator<NumberedLink>() {

                 public int compare(NumberedLink one, NumberedLink two) {

                     int result = 0;

                     do {

                         result = + Utility.compare(one.source, two.source);

                         if(result != 0) break;

                     } while (false);

                     return -result;

                 }

             };

         }     

         public Comparator<NumberedLink> lessThan() {

             return new Comparator<NumberedLink>() {

                 public int compare(NumberedLink one, NumberedLink two) {

                     int result = 0;

                     do {

                         result = + Utility.compare(one.source, two.source);

                         if(result != 0) break;

                     } while (false);

                     return result;

                 }

             };

         }     

         public TypeReader<NumberedLink> orderedReader(ArrayInput _input) {

             return new ShreddedReader(_input);

         }    

         public TypeReader<NumberedLink> orderedReader(ArrayInput _input, int bufferSize) {

             return new ShreddedReader(_input, bufferSize);

         }    

         public OrderedWriter<NumberedLink> orderedWriter(ArrayOutput _output) {

             ShreddedWriter w = new ShreddedWriter(_output);

             return new OrderedWriterClass(w); 

         }                                    

         public static class OrderedWriterClass extends OrderedWriter< NumberedLink > {

             NumberedLink last = null;

             ShreddedWriter shreddedWriter = null; 

             public OrderedWriterClass(ShreddedWriter s) {

                 this.shreddedWriter = s;

             }

             public void process(NumberedLink object) throws IOException {

                boolean processAll = false;

                if (processAll || last == null || 0 != Utility.compare(object.source, last.source)) { processAll = true; shreddedWriter.processSource(object.source); }

                shreddedWriter.processTuple(object.destination);

                last = object;

             }           

             public void close() throws IOException {

                 shreddedWriter.close();

             }

             public Class<NumberedLink> getInputClass() {

                 return NumberedLink.class;

             }

         } 

         public ReaderSource<NumberedLink> orderedCombiner(Collection<TypeReader<NumberedLink>> readers, boolean closeOnExit) {

             ArrayList<ShreddedReader> shreddedReaders = new ArrayList();

             for (TypeReader<NumberedLink> reader : readers) {

                 shreddedReaders.add((ShreddedReader)reader);

             }

             return new ShreddedCombiner(shreddedReaders, closeOnExit);

         }                  

         public NumberedLink clone(NumberedLink object) {

             NumberedLink result = new NumberedLink();

             if (object == null) return result;

             result.source = object.source; 

             result.destination = object.destination; 

             return result;

         }                 

         public Class<NumberedLink> getOrderedClass() {

             return NumberedLink.class;

         }                           

         public String[] getOrderSpec() {

             return new String[] {"+source"};

         }

         public static String getSpecString() {

             return "+source";

         }

         public interface ShreddedProcessor extends Step {

             public void processSource(long source) throws IOException;

             public void processTuple(long destination) throws IOException;

             public void close() throws IOException;

         }    

         public interface ShreddedSource extends Step {

         }                                              

         public static class ShreddedWriter implements ShreddedProcessor {

             ArrayOutput output;

             ShreddedBuffer buffer = new ShreddedBuffer();

             long lastSource;

             boolean lastFlush = false;

             public ShreddedWriter(ArrayOutput output) {

                 this.output = output;

             }                        

             public void close() throws IOException {

                 flush();

             }

             public void processSource(long source) {

                 lastSource = source;

                 buffer.processSource(source);

             }

             public final void processTuple(long destination) throws IOException {

                 if (lastFlush) {

                     if(buffer.sources.size() == 0) buffer.processSource(lastSource);

                     lastFlush = false;

                 }

                 buffer.processTuple(destination);

                 if (buffer.isFull())

                     flush();

             }

             public final void flushTuples(int pauseIndex) throws IOException {

                 while (buffer.getReadIndex() < pauseIndex) {

                     output.writeLong(buffer.getDestination());

                     buffer.incrementTuple();

                 }

             }  

             public final void flushSource(int pauseIndex) throws IOException {

                 while (buffer.getReadIndex() < pauseIndex) {

                     int nextPause = buffer.getSourceEndIndex();

                     int count = nextPause - buffer.getReadIndex();

                     output.writeLong(buffer.getSource());

                     output.writeInt(count);

                     buffer.incrementSource();

                     flushTuples(nextPause);

                     assert nextPause == buffer.getReadIndex();

                 }

             }

             public void flush() throws IOException { 

                 flushSource(buffer.getWriteIndex());

                 buffer.reset(); 

                 lastFlush = true;

             }                           

         }

         public static class ShreddedBuffer {

             ArrayList<Long> sources = new ArrayList();

             ArrayList<Integer> sourceTupleIdx = new ArrayList();

             int sourceReadIdx = 0;

             long[] destinations;

             int writeTupleIndex = 0;

             int readTupleIndex = 0;

             int batchSize;

             public ShreddedBuffer(int batchSize) {

                 this.batchSize = batchSize;

                 destinations = new long[batchSize];

             }                              

             public ShreddedBuffer() {    

                 this(10000);

             }                                                                                                                    

             public void processSource(long source) {

                 sources.add(source);

                 sourceTupleIdx.add(writeTupleIndex);

             }                                      

             public void processTuple(long destination) {

                 assert sources.size() > 0;

                 destinations[writeTupleIndex] = destination;

                 writeTupleIndex++;

             }

             public void resetData() {

                 sources.clear();

                 sourceTupleIdx.clear();

                 writeTupleIndex = 0;

             }                  

             public void resetRead() {

                 readTupleIndex = 0;

                 sourceReadIdx = 0;

             } 

             public void reset() {

                 resetData();

                 resetRead();

             } 

             public boolean isFull() {

                 return writeTupleIndex >= batchSize;

             }

             public boolean isEmpty() {

                 return writeTupleIndex == 0;

             }                          

             public boolean isAtEnd() {

                 return readTupleIndex >= writeTupleIndex;

             }           

             public void incrementSource() {

                 sourceReadIdx++;  

             }                                                                                              

             public void autoIncrementSource() {

                 while (readTupleIndex >= getSourceEndIndex() && readTupleIndex < writeTupleIndex)

                     sourceReadIdx++;

             }                 

             public void incrementTuple() {

                 readTupleIndex++;

             }                    

             public int getSourceEndIndex() {

                 if ((sourceReadIdx+1) >= sourceTupleIdx.size())

                     return writeTupleIndex;

                 return sourceTupleIdx.get(sourceReadIdx+1);

             }

             public int getReadIndex() {

                 return readTupleIndex;

             }   

             public int getWriteIndex() {

                 return writeTupleIndex;

             } 

             public long getSource() {

                 assert readTupleIndex < writeTupleIndex;

                 assert sourceReadIdx < sources.size();

                 return sources.get(sourceReadIdx);

             }

             public long getDestination() {

                 assert readTupleIndex < writeTupleIndex;

                 return destinations[readTupleIndex];

             }                                         

             public void copyTuples(int endIndex, ShreddedProcessor output) throws IOException {

                 while (getReadIndex() < endIndex) {

                    output.processTuple(getDestination());

                    incrementTuple();

                 }

             }                                                                           

             public void copyUntilIndexSource(int endIndex, ShreddedProcessor output) throws IOException {

                 while (getReadIndex() < endIndex) {

                     output.processSource(getSource());

                     assert getSourceEndIndex() <= endIndex;

                     copyTuples(getSourceEndIndex(), output);

                     incrementSource();

                 }

             }  

             public void copyUntilSource(ShreddedBuffer other, ShreddedProcessor output) throws IOException {

                 while (!isAtEnd()) {

                     if (other != null) {   

                         assert !other.isAtEnd();

                         int c = + Utility.compare(getSource(), other.getSource());

                         if (c > 0) {

                             break;   

                         }

                         output.processSource(getSource());

                         copyTuples(getSourceEndIndex(), output);

                     } else {

                         output.processSource(getSource());

                         copyTuples(getSourceEndIndex(), output);

                     }

                     incrementSource();  

                 }

             }

             public void copyUntil(ShreddedBuffer other, ShreddedProcessor output) throws IOException {

                 copyUntilSource(other, output);

             }

         }                         

         public static class ShreddedCombiner implements ReaderSource<NumberedLink>, ShreddedSource {   

             public ShreddedProcessor processor;

             Collection<ShreddedReader> readers;       

             boolean closeOnExit = false;

             boolean uninitialized = true;

             PriorityQueue<ShreddedReader> queue = new PriorityQueue<ShreddedReader>();

             public ShreddedCombiner(Collection<ShreddedReader> readers, boolean closeOnExit) {

                 this.readers = readers;                                                       

                 this.closeOnExit = closeOnExit;

             }

             public void setProcessor(Step processor) throws IncompatibleProcessorException {  

                 if (processor instanceof ShreddedProcessor) {

                     this.processor = new DuplicateEliminator((ShreddedProcessor) processor);

                 } else if (processor instanceof NumberedLink.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((NumberedLink.Processor) processor));

                 } else if (processor instanceof org.galagosearch.tupleflow.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((org.galagosearch.tupleflow.Processor<NumberedLink>) processor));

                 } else {

                     throw new IncompatibleProcessorException(processor.getClass().getName() + " is not supported by " + this.getClass().getName());                                                                       

                 }

             }                                

             public Class<NumberedLink> getOutputClass() {

                 return NumberedLink.class;

             }

             public void initialize() throws IOException {

                 for (ShreddedReader reader : readers) {

                     reader.fill();                                        

                     if (!reader.getBuffer().isAtEnd())

                         queue.add(reader);

                 }   

                 uninitialized = false;

             }

             public void run() throws IOException {

                 initialize();

                 while (queue.size() > 0) {

                     ShreddedReader top = queue.poll();

                     ShreddedReader next = null;

                     ShreddedBuffer nextBuffer = null; 

                     assert !top.getBuffer().isAtEnd();

                     if (queue.size() > 0) {

                         next = queue.peek();

                         nextBuffer = next.getBuffer();

                         assert !nextBuffer.isAtEnd();

                     }

                     top.getBuffer().copyUntil(nextBuffer, processor);

                     if (top.getBuffer().isAtEnd())

                         top.fill();                 

                     if (!top.getBuffer().isAtEnd())

                         queue.add(top);

                 }              

                 if (closeOnExit)

                     processor.close();

             }

             public NumberedLink read() throws IOException {

                 if (uninitialized)

                     initialize();

                 NumberedLink result = null;

                 while (queue.size() > 0) {

                     ShreddedReader top = queue.poll();

                     result = top.read();

                     if (result != null) {

                         if (top.getBuffer().isAtEnd())

                             top.fill();

                         queue.offer(top);

                         break;

                     } 

                 }

                 return result;

             }

         } 

         public static class ShreddedReader implements Step, Comparable<ShreddedReader>, TypeReader<NumberedLink>, ShreddedSource {      

             public ShreddedProcessor processor;

             ShreddedBuffer buffer;

             NumberedLink last = new NumberedLink();         

             long updateSourceCount = -1;

             long tupleCount = 0;

             long bufferStartCount = 0;  

             ArrayInput input;

             public ShreddedReader(ArrayInput input) {

                 this.input = input; 

                 this.buffer = new ShreddedBuffer();

             }                               

             public ShreddedReader(ArrayInput input, int bufferSize) { 

                 this.input = input;

                 this.buffer = new ShreddedBuffer(bufferSize);

             }

             public final int compareTo(ShreddedReader other) {

                 ShreddedBuffer otherBuffer = other.getBuffer();

                 if (buffer.isAtEnd() && otherBuffer.isAtEnd()) {

                     return 0;                 

                 } else if (buffer.isAtEnd()) {

                     return -1;

                 } else if (otherBuffer.isAtEnd()) {

                     return 1;

                 }

                 int result = 0;

                 do {

                     result = + Utility.compare(buffer.getSource(), otherBuffer.getSource());

                     if(result != 0) break;

                 } while (false);                                             

                 return result;

             }

             public final ShreddedBuffer getBuffer() {

                 return buffer;

             }                

             public final NumberedLink read() throws IOException {

                 if (buffer.isAtEnd()) {

                     fill();             

                     if (buffer.isAtEnd()) {

                         return null;

                     }

                 }

                 assert !buffer.isAtEnd();

                 NumberedLink result = new NumberedLink();

                 result.source = buffer.getSource();

                 result.destination = buffer.getDestination();

                 buffer.incrementTuple();

                 buffer.autoIncrementSource();

                 return result;

             }           

             public final void fill() throws IOException {

                 try {   

                     buffer.reset();

                     if (tupleCount != 0) {

                         if(updateSourceCount - tupleCount > 0) {

                             buffer.sources.add(last.source);

                             buffer.sourceTupleIdx.add((int) (updateSourceCount - tupleCount));

                         }

                         bufferStartCount = tupleCount;

                     }

                     while (!buffer.isFull()) {

                         updateSource();

                         buffer.processTuple(input.readLong());

                         tupleCount++;

                     }

                 } catch(EOFException e) {}

             }

             public final void updateSource() throws IOException {

                 if (updateSourceCount > tupleCount)

                     return;

                 last.source = input.readLong();

                 updateSourceCount = tupleCount + input.readInt();

                 buffer.processSource(last.source);

             }

             public void run() throws IOException {

                 while (true) {

                     fill();

                     if (buffer.isAtEnd())

                         break;

                     buffer.copyUntil(null, processor);

                 }      

                 processor.close();

             }

             public void setProcessor(Step processor) throws IncompatibleProcessorException {  

                 if (processor instanceof ShreddedProcessor) {

                     this.processor = new DuplicateEliminator((ShreddedProcessor) processor);

                 } else if (processor instanceof NumberedLink.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((NumberedLink.Processor) processor));

                 } else if (processor instanceof org.galagosearch.tupleflow.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((org.galagosearch.tupleflow.Processor<NumberedLink>) processor));

                 } else {

                     throw new IncompatibleProcessorException(processor.getClass().getName() + " is not supported by " + this.getClass().getName());                                                                       

                 }

             }                                

             public Class<NumberedLink> getOutputClass() {

                 return NumberedLink.class;

             }                

         }

         public static class DuplicateEliminator implements ShreddedProcessor {

             public ShreddedProcessor processor;

             NumberedLink last = new NumberedLink();

             boolean sourceProcess = true;

             public DuplicateEliminator() {}

             public DuplicateEliminator(ShreddedProcessor processor) {

                 this.processor = processor;

             }

             public void setShreddedProcessor(ShreddedProcessor processor) {

                 this.processor = processor;

             }

             public void processSource(long source) throws IOException {  

                 if (sourceProcess || Utility.compare(source, last.source) != 0) {

                     last.source = source;

                     processor.processSource(source);

                     sourceProcess = false;

                 }

             }  

             public void resetSource() {

                  sourceProcess = true;

             }                                                

             public void processTuple(long destination) throws IOException {

                 processor.processTuple(destination);

             } 

             public void close() throws IOException {

                 processor.close();

             }                    

         }

         public static class TupleUnshredder implements ShreddedProcessor {

             NumberedLink last = new NumberedLink();

             public org.galagosearch.tupleflow.Processor<NumberedLink> processor;                               

             public TupleUnshredder(NumberedLink.Processor processor) {

                 this.processor = processor;

             }         

             public TupleUnshredder(org.galagosearch.tupleflow.Processor<NumberedLink> processor) {

                 this.processor = processor;

             }

             public NumberedLink clone(NumberedLink object) {

                 NumberedLink result = new NumberedLink();

                 if (object == null) return result;

                 result.source = object.source; 

                 result.destination = object.destination; 

                 return result;

             }                 

             public void processSource(long source) throws IOException {

                 last.source = source;

             }   

             public void processTuple(long destination) throws IOException {

                 last.destination = destination;

                 processor.process(clone(last));

             }               

             public void close() throws IOException {

                 processor.close();

             }

         }     

         public static class TupleShredder implements Processor {

             NumberedLink last = new NumberedLink();

             public ShreddedProcessor processor;

             public TupleShredder(ShreddedProcessor processor) {

                 this.processor = processor;

             }                              

             public NumberedLink clone(NumberedLink object) {

                 NumberedLink result = new NumberedLink();

                 if (object == null) return result;

                 result.source = object.source; 

                 result.destination = object.destination; 

                 return result;

             }                 

             public void process(NumberedLink object) throws IOException {                                                                                                                                                   

                 boolean processAll = false;

                 if(last == null || Utility.compare(last.source, object.source) != 0 || processAll) { processor.processSource(object.source); processAll = true; }

                 processor.processTuple(object.destination);                                         

             }

             public Class<NumberedLink> getInputClass() {

                 return NumberedLink.class;

             }

             public void close() throws IOException {

                 processor.close();

             }                     

         }

     } 

     public static class DestinationOrder implements Order<NumberedLink> {

         public int hash(NumberedLink object) {

             int h = 0;

             h += Utility.hash(object.destination);

             return h;

         } 

         public Comparator<NumberedLink> greaterThan() {

             return new Comparator<NumberedLink>() {

                 public int compare(NumberedLink one, NumberedLink two) {

                     int result = 0;

                     do {

                         result = + Utility.compare(one.destination, two.destination);

                         if(result != 0) break;

                     } while (false);

                     return -result;

                 }

             };

         }     

         public Comparator<NumberedLink> lessThan() {

             return new Comparator<NumberedLink>() {

                 public int compare(NumberedLink one, NumberedLink two) {

                     int result = 0;

                     do {

                         result = + Utility.compare(one.destination, two.destination);

                         if(result != 0) break;

                     } while (false);

                     return result;

                 }

             };

         }     

         public TypeReader<NumberedLink> orderedReader(ArrayInput _input) {

             return new ShreddedReader(_input);

         }    

         public TypeReader<NumberedLink> orderedReader(ArrayInput _input, int bufferSize) {

             return new ShreddedReader(_input, bufferSize);

         }    

         public OrderedWriter<NumberedLink> orderedWriter(ArrayOutput _output) {

             ShreddedWriter w = new ShreddedWriter(_output);

             return new OrderedWriterClass(w); 

         }                                    

         public static class OrderedWriterClass extends OrderedWriter< NumberedLink > {

             NumberedLink last = null;

             ShreddedWriter shreddedWriter = null; 

             public OrderedWriterClass(ShreddedWriter s) {

                 this.shreddedWriter = s;

             }

             public void process(NumberedLink object) throws IOException {

                boolean processAll = false;

                if (processAll || last == null || 0 != Utility.compare(object.destination, last.destination)) { processAll = true; shreddedWriter.processDestination(object.destination); }

                shreddedWriter.processTuple(object.source);

                last = object;

             }           

             public void close() throws IOException {

                 shreddedWriter.close();

             }

             public Class<NumberedLink> getInputClass() {

                 return NumberedLink.class;

             }

         } 

         public ReaderSource<NumberedLink> orderedCombiner(Collection<TypeReader<NumberedLink>> readers, boolean closeOnExit) {

             ArrayList<ShreddedReader> shreddedReaders = new ArrayList();

             for (TypeReader<NumberedLink> reader : readers) {

                 shreddedReaders.add((ShreddedReader)reader);

             }

             return new ShreddedCombiner(shreddedReaders, closeOnExit);

         }                  

         public NumberedLink clone(NumberedLink object) {

             NumberedLink result = new NumberedLink();

             if (object == null) return result;

             result.source = object.source; 

             result.destination = object.destination; 

             return result;

         }                 

         public Class<NumberedLink> getOrderedClass() {

             return NumberedLink.class;

         }                           

         public String[] getOrderSpec() {

             return new String[] {"+destination"};

         }

         public static String getSpecString() {

             return "+destination";

         }

         public interface ShreddedProcessor extends Step {

             public void processDestination(long destination) throws IOException;

             public void processTuple(long source) throws IOException;

             public void close() throws IOException;

         }    

         public interface ShreddedSource extends Step {

         }                                              

         public static class ShreddedWriter implements ShreddedProcessor {

             ArrayOutput output;

             ShreddedBuffer buffer = new ShreddedBuffer();

             long lastDestination;

             boolean lastFlush = false;

             public ShreddedWriter(ArrayOutput output) {

                 this.output = output;

             }                        

             public void close() throws IOException {

                 flush();

             }

             public void processDestination(long destination) {

                 lastDestination = destination;

                 buffer.processDestination(destination);

             }

             public final void processTuple(long source) throws IOException {

                 if (lastFlush) {

                     if(buffer.destinations.size() == 0) buffer.processDestination(lastDestination);

                     lastFlush = false;

                 }

                 buffer.processTuple(source);

                 if (buffer.isFull())

                     flush();

             }

             public final void flushTuples(int pauseIndex) throws IOException {

                 while (buffer.getReadIndex() < pauseIndex) {

                     output.writeLong(buffer.getSource());

                     buffer.incrementTuple();

                 }

             }  

             public final void flushDestination(int pauseIndex) throws IOException {

                 while (buffer.getReadIndex() < pauseIndex) {

                     int nextPause = buffer.getDestinationEndIndex();

                     int count = nextPause - buffer.getReadIndex();

                     output.writeLong(buffer.getDestination());

                     output.writeInt(count);

                     buffer.incrementDestination();

                     flushTuples(nextPause);

                     assert nextPause == buffer.getReadIndex();

                 }

             }

             public void flush() throws IOException { 

                 flushDestination(buffer.getWriteIndex());

                 buffer.reset(); 

                 lastFlush = true;

             }                           

         }

         public static class ShreddedBuffer {

             ArrayList<Long> destinations = new ArrayList();

             ArrayList<Integer> destinationTupleIdx = new ArrayList();

             int destinationReadIdx = 0;

             long[] sources;

             int writeTupleIndex = 0;

             int readTupleIndex = 0;

             int batchSize;

             public ShreddedBuffer(int batchSize) {

                 this.batchSize = batchSize;

                 sources = new long[batchSize];

             }                              

             public ShreddedBuffer() {    

                 this(10000);

             }                                                                                                                    

             public void processDestination(long destination) {

                 destinations.add(destination);

                 destinationTupleIdx.add(writeTupleIndex);

             }                                      

             public void processTuple(long source) {

                 assert destinations.size() > 0;

                 sources[writeTupleIndex] = source;

                 writeTupleIndex++;

             }

             public void resetData() {

                 destinations.clear();

                 destinationTupleIdx.clear();

                 writeTupleIndex = 0;

             }                  

             public void resetRead() {

                 readTupleIndex = 0;

                 destinationReadIdx = 0;

             } 

             public void reset() {

                 resetData();

                 resetRead();

             } 

             public boolean isFull() {

                 return writeTupleIndex >= batchSize;

             }

             public boolean isEmpty() {

                 return writeTupleIndex == 0;

             }                          

             public boolean isAtEnd() {

                 return readTupleIndex >= writeTupleIndex;

             }           

             public void incrementDestination() {

                 destinationReadIdx++;  

             }                                                                                              

             public void autoIncrementDestination() {

                 while (readTupleIndex >= getDestinationEndIndex() && readTupleIndex < writeTupleIndex)

                     destinationReadIdx++;

             }                 

             public void incrementTuple() {

                 readTupleIndex++;

             }                    

             public int getDestinationEndIndex() {

                 if ((destinationReadIdx+1) >= destinationTupleIdx.size())

                     return writeTupleIndex;

                 return destinationTupleIdx.get(destinationReadIdx+1);

             }

             public int getReadIndex() {

                 return readTupleIndex;

             }   

             public int getWriteIndex() {

                 return writeTupleIndex;

             } 

             public long getDestination() {

                 assert readTupleIndex < writeTupleIndex;

                 assert destinationReadIdx < destinations.size();

                 return destinations.get(destinationReadIdx);

             }

             public long getSource() {

                 assert readTupleIndex < writeTupleIndex;

                 return sources[readTupleIndex];

             }                                         

             public void copyTuples(int endIndex, ShreddedProcessor output) throws IOException {

                 while (getReadIndex() < endIndex) {

                    output.processTuple(getSource());

                    incrementTuple();

                 }

             }                                                                           

             public void copyUntilIndexDestination(int endIndex, ShreddedProcessor output) throws IOException {

                 while (getReadIndex() < endIndex) {

                     output.processDestination(getDestination());

                     assert getDestinationEndIndex() <= endIndex;

                     copyTuples(getDestinationEndIndex(), output);

                     incrementDestination();

                 }

             }  

             public void copyUntilDestination(ShreddedBuffer other, ShreddedProcessor output) throws IOException {

                 while (!isAtEnd()) {

                     if (other != null) {   

                         assert !other.isAtEnd();

                         int c = + Utility.compare(getDestination(), other.getDestination());

                         if (c > 0) {

                             break;   

                         }

                         output.processDestination(getDestination());

                         copyTuples(getDestinationEndIndex(), output);

                     } else {

                         output.processDestination(getDestination());

                         copyTuples(getDestinationEndIndex(), output);

                     }

                     incrementDestination();  

                 }

             }

             public void copyUntil(ShreddedBuffer other, ShreddedProcessor output) throws IOException {

                 copyUntilDestination(other, output);

             }

         }                         

         public static class ShreddedCombiner implements ReaderSource<NumberedLink>, ShreddedSource {   

             public ShreddedProcessor processor;

             Collection<ShreddedReader> readers;       

             boolean closeOnExit = false;

             boolean uninitialized = true;

             PriorityQueue<ShreddedReader> queue = new PriorityQueue<ShreddedReader>();

             public ShreddedCombiner(Collection<ShreddedReader> readers, boolean closeOnExit) {

                 this.readers = readers;                                                       

                 this.closeOnExit = closeOnExit;

             }

             public void setProcessor(Step processor) throws IncompatibleProcessorException {  

                 if (processor instanceof ShreddedProcessor) {

                     this.processor = new DuplicateEliminator((ShreddedProcessor) processor);

                 } else if (processor instanceof NumberedLink.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((NumberedLink.Processor) processor));

                 } else if (processor instanceof org.galagosearch.tupleflow.Processor) {

                     this.processor = new DuplicateEliminator(new TupleUnshredder((org.galagosearch.tupleflow.Processor<NumberedLink>) processor));

                 } else {

                     throw new IncompatibleProcessorException(processor.getClass().getName() + " is not supported by " + this.getClass().getName());                                                                       

                 }

             }                                

             public Class<NumberedLink> getOutputClass() {

                 return NumberedLink.class;

             }

             public void initialize() throws IOException {

                 for (ShreddedReader reader : readers) {

                     reader.fill();                                        

                     if (!reader.getBuffer().isAtEnd())

                         queue.add(reader);

                 }   

                 uninitialized = false;

             }

             public void run() throws IOException {

                 initialize();

                 while (queue.size() > 0) {

                     ShreddedReader top = queue.poll();

                     ShreddedReader next = null;

                     ShreddedBuffer nextBuffer = null; 

                     assert !top.getBuffer().isAtEnd();

                     if (queue.size() > 0) {

                         next = queue.peek();

                         nextBuffer = next.getBuffer();

                         assert !nextBuffer.isAtEnd();

                     }

                     top.getBuffer().copyUntil(nextBuffer, processor);

                     if (top.getBuffer().isAtEnd())

                         top.fill();                 

                     if (!top.getBuffer().isAtEnd())

                         queue.add(top);

                 }              

                 if (closeOnExit)

                     processor.close();

             }

             public NumberedLink read() throws IOException {

                 if (uninitialized)

                     initialize();

                 NumberedLink result = null;

                 while (queue.size() > 0) {

                     ShreddedReader top = queue.poll();

                     result = top.read();

                     if (result != null) {

                         if (top.getBuffer().isAtEnd())

                             top.fill();

                         queue.offer(top);

                         break;

                     } 

                 }

                 return result;

             }

         } 

         public static class ShreddedReader implements Step, Comparable<ShreddedReader>, TypeReader<NumberedLink>, ShreddedSource {      

             public ShreddedProcessor processor;

             ShreddedBuffer buffer;

             NumberedLink last = new NumberedLink();         

             long updateDestinationCount = -1;

             long tupleCount = 0;

             long bufferStartCount = 0;  

             ArrayInput input;

             public ShreddedReader(ArrayInput input) {

                 this.input = input; 

                 this.buffer = new ShreddedBuffer();

             }                               

             public ShreddedReader(ArrayInput input, int bufferSize) { 

                 this.input = input;

                 this.buffer = new ShreddedBuffer(bufferSize);

             }

             public final int compareTo(ShreddedReader other) {

                 ShreddedBuffer otherBuffer = other.getBuffer();

                 if (buffer.isAtEnd() && otherBuffer.isAtEnd()) {

                     return 0;                 

                 } else if (buffer.isAtEnd()) {

                     return -1;

                 } else if (otherBuffer.isAtEnd()) {

                     return 1;

                 }

                 int result = 0;

                 do {

                     result = + Utility.compare(buffer.getDestination(), otherBuffer.getDestination());

                     if(result != 0) break;

                 } while (false);                                             

                 return result;

             }

             public final ShreddedBuffer getBuffer() {

                 return buffer;

             }                

             public final NumberedLink read() throws IOException {

                 if (buffer.isAtEnd()) {

                     fill();             

                     if (buffer.isAtEnd()) {

                         return null;

                     }

                 }

                 assert !buffer.isAtEnd();

                 NumberedLink result = new NumberedLink();

                 result.destination = buffer.getDestination();

                 result.source = buffer.getSource();

                 buffer.incrementTuple();

                 buffer.autoIncrementDestination();

                 return result;

             }           

             public final void fill() throws IOException {

                 try {   

                     buffer.reset();

                     if (tupleCount != 0) {

                         if(updateDestinationCount - tupleCount > 0) {

                             buffer.destinations.add(last.destination);

                             buffer.destinationTupleIdx.add((int) (updateDestinationCount - tupleCount));

                         }

                         bufferStartCount = tupleCount;

                     }

                     while (!buffer.isFull()) {

                         updateDestination();

                         buffer.processTuple(input.readLong());

                         tupleCount++;

                     }

                 } catch(EOFException e) {}

             }

             public final void updateDestination() throws IOException {