| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.uima.cas.impl; |
| |
| import java.util.Comparator; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.uima.UIMAFramework; |
| import org.apache.uima.cas.FSIterator; |
| import org.apache.uima.cas.FeatureStructure; |
| import org.apache.uima.internal.util.Misc; |
| import org.apache.uima.jcas.cas.TOP; |
| |
| /** |
| * Low-level FS iterator. Returns FS references, instead of FS objects. |
| * |
| * @see org.apache.uima.cas.FSIterator |
| * |
| */ |
| public interface LowLevelIterator<T extends FeatureStructure> extends FSIterator<T> { |
| |
| /** |
| * Return the current FS reference. |
| * |
| * @return The current FS reference. |
| * @exception NoSuchElementException |
| * Iff the iterator is not valid. |
| */ |
| default int ll_get() throws NoSuchElementException { |
| return get()._id(); |
| }; |
| |
| /** |
| * Try to position the iterator so that the current element is greater than or equal to |
| * <code>fsRef</code>, and previous elements are less than <code>fsRef</code>. This may |
| * invalidate the iterator. If fsRef can not be compared to FSs in the index, the results are |
| * undefined. |
| * |
| * @param fsRef |
| * The FS reference the iterator should be set to. |
| */ |
| default void moveTo(int fsRef) { |
| moveTo(ll_getIndex().getCasImpl().ll_getFSForRef(fsRef)); |
| } |
| |
| |
| |
| /** |
| * @return The size of the index. In case of copy-on-write, this returns the size of the |
| * index at the time the iterator was created, or at the last moveTo, moveToFirst, or moveToLast. |
| * To get the current index size, use ll_getIndex().getSize() |
| */ |
| int ll_indexSizeMaybeNotCurrent(); |
| |
| /** |
| * Get the index for just the top most type of this iterator (excludes subtypes). |
| * |
| * @return The index. |
| */ |
| LowLevelIndex<T> ll_getIndex(); |
| |
| /** |
| * @return an estimate of the maximum span over all annotations (end - begin) |
| */ |
| int ll_maxAnnotSpan(); |
| |
| /** |
| * @return true if one or more of the underlying indexes this iterator goes over, has been updated |
| * since initialization or resetting operation (moveToFirst/Last/feature_structure). |
| * This includes empty iterators becoming non-empty. |
| */ |
| boolean isIndexesHaveBeenUpdated(); |
| |
| /** |
| * Internal use |
| * @return true if the iterator was refreshed to match the current index |
| */ |
| boolean maybeReinitIterator(); |
| |
| |
| /* (non-Javadoc) |
| * @see org.apache.uima.cas.FSIterator#moveToFirst() |
| */ |
| @Override |
| default void moveToFirst() { |
| maybeReinitIterator(); |
| moveToFirstNoReinit(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.uima.cas.FSIterator#moveToLast() |
| */ |
| @Override |
| default void moveToLast() { |
| maybeReinitIterator(); |
| moveToLastNoReinit(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.uima.cas.FSIterator#moveTo(org.apache.uima.cas.FeatureStructure) |
| */ |
| @Override |
| default void moveTo(FeatureStructure fs) { |
| maybeReinitIterator(); |
| moveToNoReinit(fs); |
| } |
| |
| |
| /** |
| * Internal use |
| * same as moveToFirst, but won't reset to use current contents of index if index has changed |
| */ |
| void moveToFirstNoReinit(); |
| |
| /** |
| * Internal use |
| * same as moveToLast, but won't reset to use current contents of index if index has changed |
| */ |
| void moveToLastNoReinit(); |
| |
| /** |
| * Internal use |
| * same as moveTo(fs), but won't reset to use current contents of index if index has changed |
| * @param fs the fs to use as the template identifying the place to move to |
| */ |
| void moveToNoReinit(FeatureStructure fs); |
| |
| /** |
| * @return the comparator used by this iterator. It is always a withoutID style, and may be |
| * either a withType or NoType style. |
| */ |
| Comparator<TOP> getComparator(); |
| |
| default void ll_remove() { |
| LowLevelIndex<T> idx = ll_getIndex(); |
| if (null == idx) { |
| UIMAFramework.getLogger().warn("remove called on UIMA iterator but iterator not over any index"); |
| } else { |
| idx.getCasImpl().removeFsFromIndexes(get()); |
| } |
| } |
| |
| |
| /** |
| * an empty iterator |
| */ |
| static final LowLevelIterator<FeatureStructure> FS_ITERATOR_LOW_LEVEL_EMPTY = new LowLevelIterator_empty(); |
| |
| /** |
| * Internal use constants |
| */ |
| static final boolean IS_ORDERED = false; |
| |
| /** |
| * @return false if this iterator is over an unordered collection or set or bag |
| */ |
| default boolean isMoveToSupported() { return false; } |
| } |