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:org.zkybase.api.mapper.ApplicationMapperTestCase.java

private void setUpTestObjects() {
    this.applicationEntityIterator = new Iterator<ApplicationNode>() {
        private int count = APP_COUNT;

        @Override//from  w  w w  .j a  v  a  2  s.  c o m
        public boolean hasNext() {
            return (count-- > 0);
        }

        @Override
        public ApplicationNode next() {
            return applicationEntity;
        }

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

    when(applicationEntities.iterator()).thenReturn(applicationEntityIterator);

    when(applicationEntity.getId()).thenReturn(APPLICATION_ID);
    when(applicationEntity.getName()).thenReturn(APPLICATION_NAME);

    when(applicationDto.getId()).thenReturn(APPLICATION_ID);
    when(applicationDto.getName()).thenReturn(APPLICATION_NAME);
}

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From source file:com.netflix.astyanax.thrift.ThriftAllRowsImpl.java

/**
 * Each call to .iterator() returns a new context starting at the beginning
 * of the column family.//from w  w  w.  ja  v a 2 s . c  o  m
 */
@Override
public Iterator<Row<K, C>> iterator() {
    return new Iterator<Row<K, C>>() {
        private KeyRange range;
        private org.apache.cassandra.thrift.KeySlice lastRow;
        private List<org.apache.cassandra.thrift.KeySlice> list = null;
        private Iterator<org.apache.cassandra.thrift.KeySlice> iter = null;
        private boolean bContinueSearch = true;
        private boolean bIgnoreTombstones = true;

        {
            String startToken = query.getStartToken() == null ? partitioner.getMinToken()
                    : query.getStartToken();
            String endToken = query.getEndToken() == null ? partitioner.getMaxToken() : query.getEndToken();

            range = new KeyRange().setCount(query.getBlockSize()).setStart_token(startToken)
                    .setEnd_token(endToken);

            if (query.getIncludeEmptyRows() == null) {
                if (query.getPredicate().isSetSlice_range()
                        && query.getPredicate().getSlice_range().getCount() == 0) {
                    bIgnoreTombstones = false;
                }
            } else {
                bIgnoreTombstones = !query.getIncludeEmptyRows();
            }
        }

        @Override
        public boolean hasNext() {
            // Get the next block
            while (iter == null || (!iter.hasNext() && bContinueSearch)) {
                if (lastRow != null) {
                    // Determine the start token for the next page
                    String token = partitioner.getTokenForKey(ByteBuffer.wrap(lastRow.getKey()));
                    if (query.getRepeatLastToken()) {
                        // Start token is non-inclusive
                        range.setStart_token(partitioner.getTokenMinusOne(token));
                    } else {
                        range.setStart_token(token);
                    }
                }

                // Get the next block of rows from cassandra, exit if none returned
                list = query.getNextBlock(range);
                if (list == null || list.isEmpty()) {
                    return false;
                }

                // Since we may trim tombstones set a flag indicating whether a complete
                // block was returned so we can know to try to fetch the next one
                bContinueSearch = (list.size() == query.getBlockSize());

                // Trim the list from tombstoned rows, i.e. rows with no columns
                iter = list.iterator();
                if (iter == null || !iter.hasNext()) {
                    return false;
                }

                KeySlice previousLastRow = lastRow;
                lastRow = Iterables.getLast(list);

                if (query.getRepeatLastToken() && previousLastRow != null) {
                    iter.next();
                    iter.remove();
                }

                if (iter.hasNext() && bIgnoreTombstones) {
                    // Discard any tombstones
                    while (iter.hasNext()) {
                        KeySlice row = iter.next();
                        if (row.getColumns().isEmpty()) {
                            iter.remove();
                        }
                    }

                    // Get the iterator again
                    iter = list.iterator();
                }
            }
            return iter.hasNext();
        }

        @Override
        public Row<K, C> next() {
            org.apache.cassandra.thrift.KeySlice row = iter.next();
            return new ThriftRowImpl<K, C>(columnFamily.getKeySerializer().fromBytes(row.getKey()),
                    ByteBuffer.wrap(row.getKey()), new ThriftColumnOrSuperColumnListImpl<C>(row.getColumns(),
                            columnFamily.getColumnSerializer()));
        }

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

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From source file:com.bigdata.rdf.sail.webapp.client.EntityContentProvider.java

@Override
public Iterator<ByteBuffer> iterator() {
    try {//from ww  w  . j a  v  a 2  s .c  o  m
        final InputStream instr;

        if (m_entity.isStreaming()) {
            instr = m_entity.getContent();
        } else {
            // If Apache Entity does not stream then we need to double buffer to an output stream - not ideal
            final ByteArrayOutputStream streambuf = new ByteArrayOutputStream();
            m_entity.writeTo(streambuf);

            instr = new ByteArrayInputStream(streambuf.toByteArray());
        }

        return new Iterator<ByteBuffer>() {

            boolean eof = false;
            int bufindex = 0;

            @Override
            public boolean hasNext() {
                return !eof;
            }

            @Override
            public ByteBuffer next() {
                final byte[] buf = new byte[1024];
                try {
                    final int rdlen = instr.read(buf);

                    // System.out.println("Returning ByteBuffer[" + bufindex++ + "] length: " + rdlen);

                    if (rdlen == -1) {
                        eof = true;
                        return ByteBuffer.wrap(buf, 0, 0);
                    } else {
                        return ByteBuffer.wrap(buf, 0, rdlen);
                    }
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    } catch (Exception e) {
        throw new RuntimeException("Unexpected", e);
    }
}

---

From source file:de.zib.gndms.kit.configlet.PublishConfiglet.java

/**
 *  Updates {@link PublishConfiglet#publishingSites} with the newest publishers. Should be invoked by {@link PublishConfiglet#update}
 *//*from  w ww .  ja va2s .  c  om*/
private void configPublishingSites() {
    try {
        final ConfigProvider mapConfig = getMapConfig().getDynArrayOption("publishers");
        publishingSites = new Iterable<String>() {
            public Iterator<String> iterator() {
                final Iterator<String> keys = mapConfig.dynArrayKeys();
                return new Iterator<String>() {
                    public boolean hasNext() {
                        return keys.hasNext();
                    }

                    public String next() {
                        return mapConfig.getOption(keys.next(), "").trim();
                    }

                    public void remove() {
                        keys.remove();
                    }
                };
            }
        };
    } catch (ParseException e) {
        getLog().warn(e);
    } catch (MandatoryOptionMissingException e) {
        getLog().warn(e);
    }
}

---

From source file:CollectionUtilities.java

public static Iterator singletonIterator(final Object item) {
    return new Iterator() {
        private boolean gotItem = false;

        public boolean hasNext() {
            return !this.gotItem;
        }/*from w  w w . ja  v  a 2s .  c om*/

        public Object next() {
            if (this.gotItem) {
                throw new NoSuchElementException();
            }
            this.gotItem = true;
            return item;
        }

        public void remove() {
            if (!this.gotItem) {
                this.gotItem = true;
            } else {
                throw new NoSuchElementException();
            }
        }
    };
}

---

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

private Iterator<RawElement> toRawElements(final List<Object> list) {
    final int size = list.size();

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

        @Override/*  w w  w . j  a  va  2  s .c om*/
        public boolean hasNext() {
            return index < size;
        }

        @Override
        public RawElement next() {
            if (index >= size) {
                throw new NoSuchElementException();
            }
            return new ListElement(index++, list);
        }
    };
}

---

From source file:org.dataconservancy.archive.impl.elm.fs.FsMetadataStore.java

public Iterable<Metadata> getAll(final String... types) {

    final List<String> accepted = Arrays.asList(types);

    return new Iterable<Metadata>() {

        @SuppressWarnings("unchecked")
        public Iterator<Metadata> iterator() {

            final Iterator<File> fileIterator = FileUtils.iterateFiles(new File(getBaseDir()), getSuffix(),
                    true);//from   ww  w  . j ava  2 s .c  o m

            return new Iterator<Metadata>() {

                private Metadata next;

                {
                    advanceNext();
                }

                public boolean hasNext() {
                    return next != null;
                }

                public Metadata next() {
                    Metadata toReturn = next;
                    advanceNext();
                    return toReturn;
                }

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

                private void advanceNext() {

                    while (fileIterator.hasNext()) {
                        File candidate = fileIterator.next();
                        Metadata m = new FsMetadata(candidate);
                        if (accepted.isEmpty() || accepted.contains(m.getType())) {
                            next = m;
                            return;
                        }
                    }
                    next = null;
                }
            };
        }
    };
}

---

From source file:io.druid.data.input.impl.AbstractTextFilesFirehoseFactory.java

@Override
public Firehose connect(StringInputRowParser firehoseParser, File temporaryDirectory) throws IOException {
    if (objects == null) {
        objects = ImmutableList.copyOf(Preconditions.checkNotNull(initObjects(), "initObjects"));
    }/*ww w.j av  a  2  s.  c  om*/
    final Iterator<T> iterator = objects.iterator();
    return new FileIteratingFirehose(new Iterator<LineIterator>() {
        @Override
        public boolean hasNext() {
            return iterator.hasNext();
        }

        @Override
        public LineIterator next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            final T object = iterator.next();
            try {
                return IOUtils.lineIterator(wrapObjectStream(object, openObjectStream(object)), Charsets.UTF_8);
            } catch (Exception e) {
                LOG.error(e, "Exception reading object[%s]", object);
                throw Throwables.propagate(e);
            }
        }
    }, firehoseParser);
}

---

From source file:at.molindo.notify.model.BeanParams.java

@Override
public Iterator<ParamValue> iterator() {
    return new Iterator<ParamValue>() {

        private final Iterator<PropertyDescriptor> _iter = getDescriptorsIter();
        private ParamValue _next = findNext();

        private ParamValue findNext() {
            while (_iter.hasNext()) {
                PropertyDescriptor pd = _iter.next();
                if (pd.getWriteMethod() == null || pd.getReadMethod() == null) {
                    continue;
                }/* w w w  .ja va  2s  .c om*/
                Object value = invoke(pd.getReadMethod());
                if (value == null) {
                    continue;
                }
                return Param.p(pd.getPropertyType(), pd.getName()).paramValue(value);
            }
            return null;
        }

        @Override
        public boolean hasNext() {
            return _next != null;
        }

        @Override
        public ParamValue next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            ParamValue next = _next;
            _next = findNext();
            return next;
        }

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

---

From source file:org.languagetool.dev.errorcorpus.PedlerCorpus.java

@Override
public Iterator<ErrorSentence> iterator() {
    return new Iterator<ErrorSentence>() {
        @Override//  w  w w  . j  a v a 2  s.c  om
        public boolean hasNext() {
            return pos < lines.size();
        }

        @Override
        public ErrorSentence next() {
            String line = lines.get(pos++);
            ErrorSentence sentence = getIncorrectSentence(line);
            return sentence;
        }

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

---

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