| /* |
| * 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.cassandra.cql3.restrictions; |
| |
| import java.nio.ByteBuffer; |
| import java.util.*; |
| |
| import com.google.common.collect.BoundType; |
| import com.google.common.collect.ImmutableRangeSet; |
| import com.google.common.collect.Range; |
| import com.google.common.collect.RangeSet; |
| |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.cql3.statements.Bound; |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.dht.IPartitioner; |
| import org.apache.cassandra.dht.Token; |
| import org.apache.cassandra.exceptions.InvalidRequestException; |
| |
| import static org.apache.cassandra.cql3.statements.Bound.END; |
| import static org.apache.cassandra.cql3.statements.Bound.START; |
| |
| /** |
| * <code>Restriction</code> decorator used to merge non-token restriction and token restriction on partition keys. |
| */ |
| final class TokenFilter extends ForwardingPrimaryKeyRestrictions |
| { |
| /** |
| * The decorated restriction |
| */ |
| private PrimaryKeyRestrictions restrictions; |
| |
| /** |
| * The restriction on the token |
| */ |
| private TokenRestriction tokenRestriction; |
| |
| /** |
| * Partitioner to manage tokens, extracted from tokenRestriction metadata. |
| */ |
| private final IPartitioner partitioner; |
| |
| @Override |
| protected PrimaryKeyRestrictions getDelegate() |
| { |
| return restrictions; |
| } |
| |
| @Override |
| public boolean isOnToken() |
| { |
| // if all partition key columns have non-token restrictions, we can simply use the token range to filter |
| // those restrictions and then ignore the token range |
| return restrictions.size() < tokenRestriction.size(); |
| } |
| |
| public TokenFilter(PrimaryKeyRestrictions restrictions, TokenRestriction tokenRestriction) |
| { |
| this.restrictions = restrictions; |
| this.tokenRestriction = tokenRestriction; |
| this.partitioner = tokenRestriction.metadata.partitioner; |
| } |
| |
| @Override |
| public List<ByteBuffer> values(QueryOptions options) throws InvalidRequestException |
| { |
| return filter(restrictions.values(options), options); |
| } |
| |
| @Override |
| public NavigableSet<Clustering> valuesAsClustering(QueryOptions options) throws InvalidRequestException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public PrimaryKeyRestrictions mergeWith(Restriction restriction) throws InvalidRequestException |
| { |
| if (restriction.isOnToken()) |
| return new TokenFilter(restrictions, (TokenRestriction) tokenRestriction.mergeWith(restriction)); |
| |
| return new TokenFilter(super.mergeWith(restriction), tokenRestriction); |
| } |
| |
| @Override |
| public boolean isInclusive(Bound bound) |
| { |
| return tokenRestriction.isInclusive(bound); |
| } |
| |
| @Override |
| public boolean hasBound(Bound b) |
| { |
| return tokenRestriction.hasBound(b); |
| } |
| |
| @Override |
| public List<ByteBuffer> bounds(Bound bound, QueryOptions options) throws InvalidRequestException |
| { |
| return tokenRestriction.bounds(bound, options); |
| } |
| |
| @Override |
| public NavigableSet<Slice.Bound> boundsAsClustering(Bound bound, QueryOptions options) throws InvalidRequestException |
| { |
| return tokenRestriction.boundsAsClustering(bound, options); |
| } |
| |
| /** |
| * Filter the values returned by the restriction. |
| * |
| * @param values the values returned by the decorated restriction |
| * @param options the query options |
| * @return the values matching the token restriction |
| * @throws InvalidRequestException if the request is invalid |
| */ |
| private List<ByteBuffer> filter(List<ByteBuffer> values, QueryOptions options) throws InvalidRequestException |
| { |
| RangeSet<Token> rangeSet = tokenRestriction.isSlice() ? toRangeSet(tokenRestriction, options) |
| : toRangeSet(tokenRestriction.values(options)); |
| |
| return filterWithRangeSet(rangeSet, values); |
| } |
| |
| /** |
| * Filter out the values for which the tokens are not included within the specified range. |
| * |
| * @param tokens the tokens range |
| * @param values the restricted values |
| * @return the values for which the tokens are not included within the specified range. |
| */ |
| private List<ByteBuffer> filterWithRangeSet(RangeSet<Token> tokens, List<ByteBuffer> values) |
| { |
| List<ByteBuffer> remaining = new ArrayList<>(); |
| |
| for (ByteBuffer value : values) |
| { |
| Token token = partitioner.getToken(value); |
| |
| if (!tokens.contains(token)) |
| continue; |
| |
| remaining.add(value); |
| } |
| return remaining; |
| } |
| |
| /** |
| * Converts the specified list into a range set. |
| * |
| * @param buffers the token restriction values |
| * @return the range set corresponding to the specified list |
| */ |
| private RangeSet<Token> toRangeSet(List<ByteBuffer> buffers) |
| { |
| ImmutableRangeSet.Builder<Token> builder = ImmutableRangeSet.builder(); |
| |
| for (ByteBuffer buffer : buffers) |
| builder.add(Range.singleton(deserializeToken(buffer))); |
| |
| return builder.build(); |
| } |
| |
| /** |
| * Converts the specified slice into a range set. |
| * |
| * @param slice the slice to convert |
| * @param options the query option |
| * @return the range set corresponding to the specified slice |
| * @throws InvalidRequestException if the request is invalid |
| */ |
| private RangeSet<Token> toRangeSet(TokenRestriction slice, QueryOptions options) throws InvalidRequestException |
| { |
| if (slice.hasBound(START)) |
| { |
| Token start = deserializeToken(slice.bounds(START, options).get(0)); |
| |
| BoundType startBoundType = toBoundType(slice.isInclusive(START)); |
| |
| if (slice.hasBound(END)) |
| { |
| BoundType endBoundType = toBoundType(slice.isInclusive(END)); |
| Token end = deserializeToken(slice.bounds(END, options).get(0)); |
| |
| if (start.equals(end) && (BoundType.OPEN == startBoundType || BoundType.OPEN == endBoundType)) |
| return ImmutableRangeSet.of(); |
| |
| if (start.compareTo(end) <= 0) |
| return ImmutableRangeSet.of(Range.range(start, |
| startBoundType, |
| end, |
| endBoundType)); |
| |
| return ImmutableRangeSet.<Token> builder() |
| .add(Range.upTo(end, endBoundType)) |
| .add(Range.downTo(start, startBoundType)) |
| .build(); |
| } |
| return ImmutableRangeSet.of(Range.downTo(start, |
| startBoundType)); |
| } |
| Token end = deserializeToken(slice.bounds(END, options).get(0)); |
| return ImmutableRangeSet.of(Range.upTo(end, toBoundType(slice.isInclusive(END)))); |
| } |
| |
| /** |
| * Deserializes the token corresponding to the specified buffer. |
| * |
| * @param buffer the buffer |
| * @return the token corresponding to the specified buffer |
| */ |
| private Token deserializeToken(ByteBuffer buffer) |
| { |
| return partitioner.getTokenFactory().fromByteArray(buffer); |
| } |
| |
| private static BoundType toBoundType(boolean inclusive) |
| { |
| return inclusive ? BoundType.CLOSED : BoundType.OPEN; |
| } |
| } |