Example usage for java.util Iterator Iterator

Introduction

In this page you can find the example usage for java.util Iterator Iterator.

Prototype

Iterator

Source Link

Usage

From source file:Main.java

/**
 * Concatenates multiple iterables into a single iterable. The iterator exposed by the returned
 * iterable does not support {@link Iterator#remove()} even if the input iterables do.
 *
 * @throws NullPointerException if {@code iterables} or any of its elements are {@code null}
 *//*from   ww w.j a va2  s.c  o m*/
public static <T> Iterable<T> concat(List<Iterable<T>> iterables) {
    for (Iterable<T> iterable : iterables) {
        Objects.requireNonNull(iterable);
    }
    return new Iterable<T>() {
        @Override
        public Iterator<T> iterator() {
            if (iterables.size() == 0) {
                return Collections.emptyIterator();
            }
            return new Iterator<T>() {
                Iterator<Iterable<T>> cursor = iterables.iterator();
                Iterator<T> currentIterator = cursor.next().iterator();

                private void advance() {
                    while (!currentIterator.hasNext() && cursor.hasNext()) {
                        currentIterator = cursor.next().iterator();
                    }
                }

                @Override
                public boolean hasNext() {
                    advance();
                    return currentIterator.hasNext();
                }

                @Override
                public T next() {
                    advance();
                    return currentIterator.next();
                }
            };
        }

    };
}

From source file:OneItemSet.java

public Iterator<E> iterator() {
    return new Iterator() {
        public boolean hasNext() {
            return hasNxt;
        }//ww  w . j  a  va2s  . c  o  m

        public E next() {
            if (hasNxt) {
                hasNxt = false;
                return item;
            }
            throw new NoSuchElementException();
        }

        public void remove() {
            item = null;
        }

        boolean hasNxt = true;
    };
}

From source file:com.github.jferard.pgloaderutils.loader.CSVRecordCleanerExample.java

@Override
public Iterable<String> cleanRecord(final CSVRecord record) {
    return new Iterable<String>() {
        @Override//from www  .j a v  a 2s . co  m
        public Iterator<String> iterator() {
            return new Iterator<String>() {
                private int i = 0;

                @Override
                public boolean hasNext() {
                    return this.i < record.size();
                }

                @Override
                public String next() {
                    String s = record.get(this.i);
                    if (this.i == 11 || this.i == 12 || this.i == 16) // numbers
                        s = s.replaceAll(",", "."); // from continental to US

                    this.i++;
                    return s;
                }

                @Override
                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
        }
    };
}

From source file:org.datalorax.populace.core.walk.inspector.ArrayInspector.java

@Override
public Iterator<RawElement> getElements(final Object instance, final Inspectors inspectors) {
    Validate.isTrue(instance.getClass().isArray(), "Expected array type, got: " + instance.getClass());
    final int length = Array.getLength(instance);

    return new Iterator<RawElement>() {
        int index = 0;

        @Override//from   ww  w  . j  av a  2 s . c  o m
        public boolean hasNext() {
            return index != length;
        }

        @Override
        public RawElement next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            return new ArrayElement(index++, instance);
        }
    };
}

From source file:edu.byu.nlp.util.Iterables2.java

/**
 * @param labeled//from w ww.j  av a 2s  .com
 * @param unlabeled
 * @return
 */
public static <F, S> Iterable<Pair<F, S>> pairUp(final Iterable<? extends F> first,
        final Iterable<? extends S> second) {
    return new Iterable<Pair<F, S>>() {
        @Override
        public Iterator<Pair<F, S>> iterator() {
            return new Iterator<Pair<F, S>>() {

                private final Iterator<? extends F> firstIt = first.iterator();
                private final Iterator<? extends S> secondIt = second.iterator();

                @Override
                public boolean hasNext() {
                    return firstIt.hasNext() && secondIt.hasNext();
                }

                @Override
                public Pair<F, S> next() {
                    return Pair.<F, S>of(firstIt.next(), secondIt.next());
                }

                @Override
                public void remove() {
                    firstIt.remove();
                    secondIt.remove();
                }
            };
        }
    };
}

From source file:com.kylinolap.cube.invertedindex.InvertedIndexCLI.java

public static Iterable<Pair<ImmutableBytesWritable, ImmutableBytesWritable>> readSequenceKVs(
        Configuration hconf, String path) throws IOException {
    final Reader reader = new Reader(hconf, SequenceFile.Reader.file(new Path(path)));
    return new Iterable<Pair<ImmutableBytesWritable, ImmutableBytesWritable>>() {
        @Override/*from   w ww .j  a  va 2 s .  c o m*/
        public Iterator<Pair<ImmutableBytesWritable, ImmutableBytesWritable>> iterator() {
            return new Iterator<Pair<ImmutableBytesWritable, ImmutableBytesWritable>>() {
                ImmutableBytesWritable k = new ImmutableBytesWritable();
                ImmutableBytesWritable v = new ImmutableBytesWritable();
                Pair<ImmutableBytesWritable, ImmutableBytesWritable> pair = new Pair<ImmutableBytesWritable, ImmutableBytesWritable>(
                        k, v);

                @Override
                public boolean hasNext() {
                    boolean hasNext = false;
                    try {
                        hasNext = reader.next(k, v);
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    } finally {
                        if (hasNext == false) {
                            IOUtils.closeQuietly(reader);
                        }
                    }
                    return hasNext;
                }

                @Override
                public Pair<ImmutableBytesWritable, ImmutableBytesWritable> next() {
                    return pair;
                }

                @Override
                public void remove() {
                    throw new UnsupportedOperationException();
                }
            };
        }
    };
}

From source file:net.shipilev.fjptrace.util.PairedList.java

@Override
public Iterator<Pair> iterator() {
    return new Iterator<Pair>() {
        int i = 0;

        @Override// w w w. j  a v a 2 s.c o m
        public boolean hasNext() {
            return i < index;
        }

        @Override
        public Pair next() {
            Pair r = new Pair(k1[i], k2[i]);
            i++;
            return r;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}

From source file:com.thoughtworks.studios.journey.utils.IterableUtils.java

public static <T> Iterable<T> uniqueBy(final Function<T, Object> function, final Iterable<T> iterable) {
    return new Iterable<T>() {
        @Override//from   www . j a va  2 s .  com
        public Iterator<T> iterator() {
            final Iterator<T> iterator = iterable.iterator();

            return new Iterator<T>() {
                Set<Object> keys = new HashSet<>();
                T nextItem;

                @Override
                public boolean hasNext() {
                    while (iterator.hasNext()) {
                        nextItem = iterator.next();
                        if (keys.add(function.apply(nextItem))) {
                            return true;
                        }
                    }

                    return false;
                }

                @Override
                public T next() {
                    if (nextItem == null && !hasNext()) {
                        throw new NoSuchElementException();
                    }

                    return nextItem;
                }

                @Override
                public void remove() {
                }
            };
        }
    };
}

From source file:la.alsocan.jsonshapeshifter.bindings.ArrayConstantBinding.java

@Override
public Iterator<JsonNode> getValue(JsonNode payload, List<Integer> context) {
    return new Iterator<JsonNode>() {

        private int count = 0;

        @Override//from w ww .  jav a  2  s. c o  m
        public boolean hasNext() {
            return count < nbIterations;
        }

        @Override
        public JsonNode next() {
            count++;
            return NullNode.instance;
        }
    };
}

From source file:WeakHashSet.java

/**
 * Returns an iterator over the elements in this set.  The elements
 * are returned in no particular order./*www .  ja  va  2 s  . c  o m*/
 *
 * @return an Iterator over the elements in this set.
 */
public Iterator iterator() {
    // remove garbage collected elements
    processQueue();

    // get an iterator of the superclass WeakHashSet
    final Iterator i = super.iterator();

    return new Iterator() {
        public boolean hasNext() {
            return i.hasNext();
        }

        public Object next() {
            // unwrap the element
            return getReferenceObject((WeakReference) i.next());
        }

        public void remove() {
            // remove the element from the HashSet
            i.remove();
        }
    };
}