org.apache.stanbol.entityhub.servicesapi.util.AdaptingIterator java code examples

Iterator<Triple> resultTripleIterator = resultGraph.filter(FIELD_QUERY_RESULT_SET,
  FIELD_QUERY_RESULT, null);
Iterator<RdfRepresentation> resultIterator = new AdaptingIterator<Triple,RdfRepresentation>(
    resultTripleIterator, new AdaptingIterator.Adapter<Triple,RdfRepresentation>() {

@Override
public final A next() {
  hasNext(); //call hasNext (to init next Element if not already done)
  if(!hasNext){
    throw new NoSuchElementException();
  } else {
    A current = next;
    next = null;
    hasNext = null;
    return current;
  }
}
/**

@Override
public final boolean hasNext() {
  if(hasNext == null){ // only once even with multiple calls
    next = prepareNext();
    hasNext = next != null;
  }
  return hasNext;
}

Iterator<Triple> resultTripleIterator = resultGraph.filter(FIELD_QUERY_RESULT_SET,
  FIELD_QUERY_RESULT, null);
Iterator<RdfRepresentation> resultIterator = new AdaptingIterator<Triple,RdfRepresentation>(
    resultTripleIterator, new AdaptingIterator.Adapter<Triple,RdfRepresentation>() {

@Override
public final boolean hasNext() {
  if(hasNext == null){ // only once even with multiple calls
    next = prepareNext();
    hasNext = next != null;
  }
  return hasNext;
}

@Override
public final A next() {
  hasNext(); //call hasNext (to init next Element if not already done)
  if(!hasNext){
    throw new NoSuchElementException();
  } else {
    A current = next;
    next = null;
    hasNext = null;
    return current;
  }
}
/**

@Override
public Iterator<Text> getText(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(new IRI(field)),
      new Literal2TextAdapter<Literal>(),
      Text.class);
}

@Override
public Iterator<Object> get(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<RDFTerm, Object>(graphNode.getObjects(new IRI(field)),
      new Resource2ValueAdapter<RDFTerm>(),Object.class);
}

@Override
public Iterator<Reference> getReferences(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<IRI,Reference>(
      graphNode.getIRIObjects(new IRI(field)),
      new IRI2ReferenceAdapter(),Reference.class);
}

@Override
public Iterator<Object> get(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<RDFTerm, Object>(graphNode.getObjects(new IRI(field)),
      new Resource2ValueAdapter<RDFTerm>(),Object.class);
}

@Override
public Iterator<Reference> getReferences(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<IRI,Reference>(
      graphNode.getIRIObjects(new IRI(field)),
      new IRI2ReferenceAdapter(),Reference.class);
}

@Override
public Iterator<Text> get(String field, String...languages) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(new IRI(field)),
      new Literal2TextAdapter<Literal>(languages),
      Text.class);
}

@Override
public Iterator<Text> getText(String field) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(new IRI(field)),
      new Literal2TextAdapter<Literal>(),
      Text.class);
}

@Override
public Iterator<Text> get(String field, String...languages) {
  if(field == null){
    throw new IllegalArgumentException("The parsed field MUST NOT be NULL");
  } else if(field.isEmpty()){
    throw new IllegalArgumentException("The parsed field MUST NOT be Empty");
  }
  return new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(new IRI(field)),
      new Literal2TextAdapter<Literal>(languages),
      Text.class);
}

@Override
public Iterator<String> getFieldNames() {
  return new AdaptingIterator<IRI, String>(graphNode.getProperties(),
      new Resource2StringAdapter<IRI>(), String.class);
}

@Override
public Iterator<String> getFieldNames() {
  return new AdaptingIterator<IRI, String>(graphNode.getProperties(),
      new Resource2StringAdapter<IRI>(), String.class);
}

  return new AdaptingIterator<IRI, T>(
      graphNode.getIRIObjects(fieldIRI),
      new IRIAdapter<T>(),
      type);
} else if(Reference.class.isAssignableFrom(type)){
  return (Iterator<T>) new AdaptingIterator<IRI,Reference>(
      graphNode.getIRIObjects(fieldIRI),
      new IRI2ReferenceAdapter(),Reference.class);
} else if(Text.class.isAssignableFrom(type)){
  return (Iterator<T>)new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(fieldIRI),
      new Literal2TextAdapter<Literal>(),
      Text.class);
} else { //support for Literals -> Type conversions
  return new AdaptingIterator<Literal, T>(
      graphNode.getLiterals(fieldIRI),
      new LiteralAdapter<Literal, T>(),

resultIt = new AdaptingIterator<Entity,Representation>(site.findEntities(query).iterator(),
    new AdaptingIterator.Adapter<Entity,Representation>() {
      @Override

Iterator<Representation> representationIterator = new AdaptingIterator<SolutionMapping, Representation>(
    result, new AdaptingIterator.Adapter<SolutionMapping, Representation>() {

  return new AdaptingIterator<IRI, T>(
      graphNode.getIRIObjects(fieldIRI),
      new IRIAdapter<T>(),
      type);
} else if(Reference.class.isAssignableFrom(type)){
  return (Iterator<T>) new AdaptingIterator<IRI,Reference>(
      graphNode.getIRIObjects(fieldIRI),
      new IRI2ReferenceAdapter(),Reference.class);
} else if(Text.class.isAssignableFrom(type)){
  return (Iterator<T>)new AdaptingIterator<Literal, Text>(
      graphNode.getLiterals(fieldIRI),
      new Literal2TextAdapter<Literal>(),
      Text.class);
} else { //support for Literals -> Type conversions
  return new AdaptingIterator<Literal, T>(
      graphNode.getLiterals(fieldIRI),
      new LiteralAdapter<Literal, T>(),

Javadoc

Uses the parsed Adapter to convert values of type T to values of type A. If an instance of T can not be converted to A, than such values are filtered. This means that this implementation can be used for both filtering and converting of values of the base iterator. In fact the FilteringIterator is implemented based on this class.

Note that Iterator#remove() only works as long as Iterator#hasNext() was not called to determine if there are further elements. The reason for that is, that in order to filter elements of the parent iterator Iterator#next() has to be called to check weather any further element is valid against the used Filter. This call to Iterator#next() causes the parent Iterator to switch to the next element, meaning that after that the remove() method would delete a different element. To avoid that this Iterator throws an IllegalStateException in such cases. If the parent Iterator does not support remove() at all an UnsupportedOperationException is thrown.

Most used methods

<init>
Constructs an instance based on an iterator of type T, an adapter and the target type
hasNext
prepareNext

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How to useAdaptingIterator in org.apache.stanbol.entityhub.servicesapi.util

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How to use
AdaptingIterator
in
org.apache.stanbol.entityhub.servicesapi.util