Package org.apache.uima.cas.impl

Class FsIndex_snapshot<T extends FeatureStructure>

  • All Implemented Interfaces:
    java.lang.Iterable<T>, java.util.Collection<T>, java.util.Comparator<FeatureStructure>, FSIndex<T>, LowLevelIndex<T>
    public class FsIndex_snapshot<T extends FeatureStructure>
extends java.util.AbstractCollection<T>
implements LowLevelIndex<T>, java.util.Comparator<FeatureStructure>
    Implementation of light-weight wrapper of normal indexes, which support special kinds of iterators base on the setting of IteratorExtraFunction

    • Field Detail

      • comparatorWithoutId

        private final java.util.Comparator<TOP> comparatorWithoutId

      • comparatorNoTypeWithoutId

        private final java.util.Comparator<TOP> comparatorNoTypeWithoutId

    • Constructor Detail

      • FsIndex_snapshot

        public FsIndex_snapshot​(FsIndex_iicp<T> wrapped,
                        java.util.Comparator<TOP> comparatorWithoutId,
                        java.util.Comparator<TOP> comparatorTypeWithoutId)

    • Method Detail

      • getType

        public Type getType()
        Description copied from interface: FSIndex
        Return the type of feature structures this index contains.
        Specified by:
        getType in interface FSIndex<T extends FeatureStructure>
        Returns:
        The type of feature structures in this index.

      • contains

        public boolean contains​(FeatureStructure fs)
        Description copied from interface: FSIndex

        Check if the index contains an element equal to the given feature structure according to the comparators defined for this index. For bag indexes (which have no comparators), the equality test means the identical feature structure. Note that this is in general not the same as feature structure identity.

        The element is used as a template, and may be a supertype of the type of the index, as long as the keys specified for this index can be accessed.

        Specified by:
        contains in interface FSIndex<T extends FeatureStructure>
        Parameters:
        fs - A Feature Structure used a template to match for equality with the FSs in the index.
        Returns:
        true if the index contains such an element.

      • find

        public T find​(FeatureStructure fs)
        Description copied from interface: FSIndex
        Find an entry in the index "equal to" the given feature structure according to the comparators specified for this index. Note that this is in general not the same as feature structure identity. For BAG indexes, it is identity, for others it means the found feature structure compares equal with the parameter in terms of the defined comparators for the index. If there are multiple different FSs in the index which compare equal with the given feature structure, an arbitrary one is returned. This differs from the moveTo(fs) operation which guarantees to move to the first feature structure occurring in the index in this case.
        Specified by:
        find in interface FSIndex<T extends FeatureStructure>
        Parameters:
        fs - A Feature Structure used a template to match with the Feature Structures in the index. It must have the keys needed to do the compare as specified for the index that it's in.
        Returns:
        A FS equal to the template argument, or null if no such FS exists.
        See Also:
        FSIterator.moveTo(FeatureStructure)

      • iterator

        public LowLevelIterator<T> iterator()
        Description copied from interface: LowLevelIndex
        Return an iterator over the index. The position of the iterator will be set to return the first item in the index. If the index is empty, the iterator position will be marked as invalid.
        Specified by:
        iterator in interface java.util.Collection<T extends FeatureStructure>
        Specified by:
        iterator in interface FSIndex<T extends FeatureStructure>
        Specified by:
        iterator in interface java.lang.Iterable<T extends FeatureStructure>
        Specified by:
        iterator in interface LowLevelIndex<T extends FeatureStructure>
        Specified by:
        iterator in class java.util.AbstractCollection<T extends FeatureStructure>
        Returns:
        An FSIterator positioned at the beginning, or an invalid iterator.

      • iterator

        public LowLevelIterator<T> iterator​(boolean orderNotNeeded,
                                    boolean ignoreType)
        Description copied from interface: LowLevelIndex
        Internal use, used by select framework. Return an iterator over the index. The position of the iterator will be set to return the first item in the index. If the index is empty, the iterator position will be marked as invalid.
        Specified by:
        iterator in interface LowLevelIndex<T extends FeatureStructure>
        Parameters:
        orderNotNeeded - if true, skips work while iterating to keep iterators over multiple types in sync.
        ignoreType - if true, the comparator used for moveTo leftmost operations will ignore typeOrder keys, if the index happens to define these
        Returns:
        An FSIterator positioned at the beginning, or an invalid iterator.

      • getIndexingStrategy

        public int getIndexingStrategy()
        Description copied from interface: FSIndex
        Return the indexing strategy.
        Specified by:
        getIndexingStrategy in interface FSIndex<T extends FeatureStructure>
        Returns:
        One of SORTED_INDEX, BAG_INDEX or SET_INDEX.

      • withSnapshotIterators

        public FSIndex<T> withSnapshotIterators()
        Description copied from interface: FSIndex
        Creates a shared copy of this FSIndex configured to produce snapshot iterators that don't throw ConcurrentModificationExceptions.
        Specified by:
        withSnapshotIterators in interface FSIndex<T extends FeatureStructure>
        Returns:
        a light-weight copy of this FSIndex, configured such that any iterator created using it will be a snapshot iterator - one where a snapshot is made of the state of the index at the time the iterator is created, and where subsequent modifications to the underlying index are allowed, but don't affect the iterator (which iterates over the read-only snapshot). Iterators produced with this won't throw ConcurrentModificationExceptions.

      • size

        public int size()
        Description copied from interface: FSIndex
        Return the number of feature structures in this index.
        Specified by:
        size in interface java.util.Collection<T extends FeatureStructure>
        Specified by:
        size in interface FSIndex<T extends FeatureStructure>
        Specified by:
        size in class java.util.AbstractCollection<T extends FeatureStructure>
        Returns:
        The number of FSs in this index.

      • compare

        public int compare​(FeatureStructure o1,
                   FeatureStructure o2)
        Description copied from interface: FSIndex
        Compare two feature structures according to the ordering relation of the index. If the input feature structures are not of the type of the index or a supertype, the result is undefined. Because the indexes compare might use only features defined in supertypes, the arguments being compared could be supertypes of the indexed type.
        Specified by:
        compare in interface java.util.Comparator<T extends FeatureStructure>
        Specified by:
        compare in interface FSIndex<T extends FeatureStructure>
        Parameters:
        o1 - the first Feature Structure to compare
        o2 - the second Feature Structure to compare
        Returns:
        -1 if fs1 < fs2; 0 if fs1 = fs2; 1 else.

      • ll_iterator

        public LowLevelIterator<T> ll_iterator​(boolean ambiguous)
        Description copied from interface: LowLevelIndex
        Get a low-level, FS reference iterator. This iterator can be disambiguated. This means that only non-overlapping annotations will be returned. Non-annotation FSs will be filtered in this mode.
        Specified by:
        ll_iterator in interface LowLevelIndex<T extends FeatureStructure>
        Parameters:
        ambiguous - When set to false, iterator will be disambiguated.
        Returns:
        An iterator for this index.

      • ll_compare

        public int ll_compare​(int ref1,
                      int ref2)
        Description copied from interface: LowLevelIndex
        Compare two Feature structures, referred to by IDs
        Specified by:
        ll_compare in interface LowLevelIndex<T extends FeatureStructure>
        Parameters:
        ref1 - -
        ref2 - -
        Returns:
        -

      • getComparator

        public java.util.Comparator<TOP> getComparator()
        Specified by:
        getComparator in interface LowLevelIndex<T extends FeatureStructure>
        Returns:
        a comparator used by this index to compare Feature Structures For sets, the equal is used to determine set membership For sorted, the comparator is the sort order (this comparator is without the ID)

      • ll_maxAnnotSpan

        public int ll_maxAnnotSpan()
        Specified by:
        ll_maxAnnotSpan in interface LowLevelIndex<T extends FeatureStructure>
        Returns:
        for annotation indexes, an conservative estimate the maximum span between begin and end The value may be larger than actual.