Java BTreeSet.empty方法代码示例

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
public NavigableSet<ClusteringBound> buildBound(boolean isStart, boolean isInclusive)
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    if (size == 0)
        return BTreeSet.of(comparator, isStart ? ClusteringBound.BOTTOM : ClusteringBound.TOP);

    ByteBuffer[] newValues = size == elements.length
                           ? elements
                           : Arrays.copyOf(elements, size);

    return BTreeSet.of(comparator, ClusteringBound.create(ClusteringBound.boundKind(isStart, isInclusive), newValues));
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
public NavigableSet<Clustering> build()
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    CBuilder builder = CBuilder.create(comparator);

    if (elementsList.isEmpty())
        return BTreeSet.of(builder.comparator(), builder.build());

    BTreeSet.Builder<Clustering> set = BTreeSet.builder(builder.comparator());
    for (int i = 0, m = elementsList.size(); i < m; i++)
    {
        List<ByteBuffer> elements = elementsList.get(i);
        set.add(builder.buildWith(elements));
    }
    return set.build();
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
/**
 * Builds the <code>clusterings</code>.
 *
 * @return the clusterings
 */
public NavigableSet<Clustering> build()
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    CBuilder builder = CBuilder.create(comparator);

    if (elementsList.isEmpty())
        return BTreeSet.of(builder.comparator(), builder.build());

    BTreeSet.Builder<Clustering> set = BTreeSet.builder(builder.comparator());
    for (int i = 0, m = elementsList.size(); i < m; i++)
    {
        List<ByteBuffer> elements = elementsList.get(i);
        set.add(builder.buildWith(elements));
    }
    return set.build();
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
public NavigableSet<Slice.Bound> buildBound(boolean isStart, boolean isInclusive)
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    CBuilder builder = CBuilder.create(comparator);

    if (elementsList.isEmpty())
        return BTreeSet.of(comparator, builder.buildBound(isStart, isInclusive));

    // Use a TreeSet to sort and eliminate duplicates
    BTreeSet.Builder<Slice.Bound> set = BTreeSet.builder(comparator);

    for (int i = 0, m = elementsList.size(); i < m; i++)
    {
        List<ByteBuffer> elements = elementsList.get(i);
        set.add(builder.buildBoundWith(elements, isStart, isInclusive));
    }
    return set.build();
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
@Override
public NavigableSet<Slice.Bound> boundsAsClustering(Bound bound, QueryOptions options) throws InvalidRequestException
{
    MultiCBuilder builder = MultiCBuilder.create(comparator);
    int keyPosition = 0;
    for (Restriction r : restrictions)
    {
        ColumnDefinition def = r.getFirstColumn();

        if (keyPosition != def.position() || r.isContains())
            break;

        if (r.isSlice())
        {
            r.appendBoundTo(builder, bound, options);
            return builder.buildBoundForSlice(bound.isStart(),
                                              r.isInclusive(bound),
                                              r.isInclusive(bound.reverse()),
                                              r.getColumnDefs());
        }

        r.appendBoundTo(builder, bound, options);

        if (builder.hasMissingElements())
            return BTreeSet.empty(comparator);

        keyPosition = r.getLastColumn().position() + 1;
    }

    // Everything was an equal (or there was nothing)
    return builder.buildBound(bound.isStart(), true);
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
/**
 * Returns the requested clustering columns.
 *
 * @param options the query options
 * @return the requested clustering columns
 */
public NavigableSet<Clustering> getClusteringColumns(QueryOptions options)
{
    // If this is a names command and the table is a static compact one, then as far as CQL is concerned we have
    // only a single row which internally correspond to the static parts. In which case we want to return an empty
    // set (since that's what ClusteringIndexNamesFilter expects).
    if (cfm.isStaticCompactTable())
        return BTreeSet.empty(cfm.comparator);

    return clusteringColumnsRestrictions.valuesAsClustering(options);
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
public NavigableSet<ClusteringBound> buildBoundForSlice(boolean isStart,
                                                    boolean isInclusive,
                                                    boolean isOtherBoundInclusive,
                                                    List<ColumnDefinition> columnDefs)
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    CBuilder builder = CBuilder.create(comparator);

    if (elementsList.isEmpty())
        return BTreeSet.of(comparator, builder.buildBound(isStart, isInclusive));

    // Use a TreeSet to sort and eliminate duplicates
    BTreeSet.Builder<ClusteringBound> set = BTreeSet.builder(comparator);

    // The first column of the slice might not be the first clustering column (e.g. clustering_0 = ? AND (clustering_1, clustering_2) >= (?, ?)
    int offset = columnDefs.get(0).position();

    for (int i = 0, m = elementsList.size(); i < m; i++)
    {
        List<ByteBuffer> elements = elementsList.get(i);

        // Handle the no bound case
        if (elements.size() == offset)
        {
            set.add(builder.buildBoundWith(elements, isStart, true));
            continue;
        }

        // In the case of mixed order columns, we will have some extra slices where the columns change directions.
        // For example: if we have clustering_0 DESC and clustering_1 ASC a slice like (clustering_0, clustering_1) > (1, 2)
        // will produce 2 slices: [BOTTOM, 1) and (1.2, 1]
        // So, the END bound will return 2 bounds with the same values 1
        ColumnDefinition lastColumn = columnDefs.get(columnDefs.size() - 1);
        if (elements.size() <= lastColumn.position() && i < m - 1 && elements.equals(elementsList.get(i + 1)))
        {
            set.add(builder.buildBoundWith(elements, isStart, false));
            set.add(builder.buildBoundWith(elementsList.get(i++), isStart, true));
            continue;
        }

        // Handle the normal bounds
        ColumnDefinition column = columnDefs.get(elements.size() - 1 - offset);
        set.add(builder.buildBoundWith(elements, isStart, column.isReversedType() ? isOtherBoundInclusive : isInclusive));
    }
    return set.build();
}
 

import org.apache.cassandra.utils.btree.BTreeSet; //导入方法依赖的package包/类
/**
 * Builds the <code>Slice.Bound</code>s for slice restrictions.
 *
 * @param isStart specify if the bound is a start one
 * @param isInclusive specify if the bound is inclusive or not
 * @param isOtherBoundInclusive specify if the other bound is inclusive or not
 * @param columnDefs the columns of the slice restriction
 * @return the <code>Slice.Bound</code>s
 */
public NavigableSet<Slice.Bound> buildBoundForSlice(boolean isStart,
                                                    boolean isInclusive,
                                                    boolean isOtherBoundInclusive,
                                                    List<ColumnDefinition> columnDefs)
{
    built = true;

    if (hasMissingElements)
        return BTreeSet.empty(comparator);

    CBuilder builder = CBuilder.create(comparator);

    if (elementsList.isEmpty())
        return BTreeSet.of(comparator, builder.buildBound(isStart, isInclusive));

    // Use a TreeSet to sort and eliminate duplicates
    BTreeSet.Builder<Slice.Bound> set = BTreeSet.builder(comparator);

    // The first column of the slice might not be the first clustering column (e.g. clustering_0 = ? AND (clustering_1, clustering_2) >= (?, ?)
    int offset = columnDefs.get(0).position();

    for (int i = 0, m = elementsList.size(); i < m; i++)
    {
        List<ByteBuffer> elements = elementsList.get(i);

        // Handle the no bound case
        if (elements.size() == offset)
        {
            set.add(builder.buildBoundWith(elements, isStart, true));
            continue;
        }

        // In the case of mixed order columns, we will have some extra slices where the columns change directions.
        // For example: if we have clustering_0 DESC and clustering_1 ASC a slice like (clustering_0, clustering_1) > (1, 2)
        // will produce 2 slices: [BOTTOM, 1) and (1.2, 1]
        // So, the END bound will return 2 bounds with the same values 1
        ColumnDefinition lastColumn = columnDefs.get(columnDefs.size() - 1);
        if (elements.size() <= lastColumn.position() && i < m - 1 && elements.equals(elementsList.get(i + 1)))
        {
            set.add(builder.buildBoundWith(elements, isStart, false));
            set.add(builder.buildBoundWith(elementsList.get(i++), isStart, true));
            continue;
        }

        // Handle the normal bounds
        ColumnDefinition column = columnDefs.get(elements.size() - 1 - offset);
        set.add(builder.buildBoundWith(elements, isStart, column.isReversedType() ? isOtherBoundInclusive : isInclusive));
    }
    return set.build();
}