| /* |
| * 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.db.filter; |
| |
| import java.io.IOException; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.ColumnDefinition; |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.db.marshal.ReversedType; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| |
| public abstract class AbstractClusteringIndexFilter implements ClusteringIndexFilter |
| { |
| static final Serializer serializer = new FilterSerializer(); |
| |
| protected final boolean reversed; |
| |
| protected AbstractClusteringIndexFilter(boolean reversed) |
| { |
| this.reversed = reversed; |
| } |
| |
| public boolean isReversed() |
| { |
| return reversed; |
| } |
| |
| protected abstract void serializeInternal(DataOutputPlus out, int version) throws IOException; |
| protected abstract long serializedSizeInternal(int version); |
| |
| protected void appendOrderByToCQLString(CFMetaData metadata, StringBuilder sb) |
| { |
| if (reversed) |
| { |
| sb.append(" ORDER BY ("); |
| int i = 0; |
| for (ColumnDefinition column : metadata.clusteringColumns()) |
| sb.append(i++ == 0 ? "" : ", ").append(column.name).append(column.type instanceof ReversedType ? " ASC" : " DESC"); |
| sb.append(')'); |
| } |
| } |
| |
| private static class FilterSerializer implements Serializer |
| { |
| public void serialize(ClusteringIndexFilter pfilter, DataOutputPlus out, int version) throws IOException |
| { |
| AbstractClusteringIndexFilter filter = (AbstractClusteringIndexFilter)pfilter; |
| |
| out.writeByte(filter.kind().ordinal()); |
| out.writeBoolean(filter.isReversed()); |
| |
| filter.serializeInternal(out, version); |
| } |
| |
| public ClusteringIndexFilter deserialize(DataInputPlus in, int version, CFMetaData metadata) throws IOException |
| { |
| Kind kind = Kind.values()[in.readUnsignedByte()]; |
| boolean reversed = in.readBoolean(); |
| |
| return kind.deserializer.deserialize(in, version, metadata, reversed); |
| } |
| |
| public long serializedSize(ClusteringIndexFilter pfilter, int version) |
| { |
| AbstractClusteringIndexFilter filter = (AbstractClusteringIndexFilter)pfilter; |
| |
| return 1 |
| + TypeSizes.sizeof(filter.isReversed()) |
| + filter.serializedSizeInternal(version); |
| } |
| } |
| } |