| /* |
| * |
| * 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.transform; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.PartitionColumns; |
| import org.apache.cassandra.db.rows.*; |
| |
| import static org.apache.cassandra.utils.Throwables.merge; |
| |
| public abstract class BaseRows<R extends Unfiltered, I extends BaseRowIterator<? extends Unfiltered>> |
| extends BaseIterator<Unfiltered, I, R> |
| implements BaseRowIterator<R> |
| { |
| |
| private Row staticRow; |
| |
| public BaseRows(I input) |
| { |
| super(input); |
| staticRow = input.staticRow(); |
| } |
| |
| // swap parameter order to avoid casting errors |
| BaseRows(BaseRows<?, ? extends I> copyFrom) |
| { |
| super(copyFrom); |
| staticRow = copyFrom.staticRow; |
| } |
| |
| public CFMetaData metadata() |
| { |
| return input.metadata(); |
| } |
| |
| public boolean isReverseOrder() |
| { |
| return input.isReverseOrder(); |
| } |
| |
| public PartitionColumns columns() |
| { |
| return input.columns(); |
| } |
| |
| public DecoratedKey partitionKey() |
| { |
| return input.partitionKey(); |
| } |
| |
| public Row staticRow() |
| { |
| return staticRow == null ? Rows.EMPTY_STATIC_ROW : staticRow; |
| } |
| |
| |
| // ************************** |
| |
| |
| @Override |
| protected Throwable runOnClose(int length) |
| { |
| Throwable fail = null; |
| Transformation[] fs = stack; |
| for (int i = 0 ; i < length ; i++) |
| { |
| try |
| { |
| fs[i].onPartitionClose(); |
| } |
| catch (Throwable t) |
| { |
| fail = merge(fail, t); |
| } |
| } |
| return fail; |
| } |
| |
| @Override |
| void add(Transformation transformation) |
| { |
| transformation.attachTo(this); |
| super.add(transformation); |
| |
| // transform any existing data |
| if (staticRow != null) |
| staticRow = transformation.applyToStatic(staticRow); |
| next = applyOne(next, transformation); |
| } |
| |
| @Override |
| protected Unfiltered applyOne(Unfiltered value, Transformation transformation) |
| { |
| return value == null |
| ? null |
| : value instanceof Row |
| ? transformation.applyToRow((Row) value) |
| : transformation.applyToMarker((RangeTombstoneMarker) value); |
| } |
| |
| @Override |
| public final boolean hasNext() |
| { |
| Stop stop = this.stop; |
| while (this.next == null) |
| { |
| Transformation[] fs = stack; |
| int len = length; |
| |
| while (!stop.isSignalled && !stopChild.isSignalled && input.hasNext()) |
| { |
| Unfiltered next = input.next(); |
| |
| if (next.isRow()) |
| { |
| Row row = (Row) next; |
| for (int i = 0 ; row != null && i < len ; i++) |
| row = fs[i].applyToRow(row); |
| next = row; |
| } |
| else |
| { |
| RangeTombstoneMarker rtm = (RangeTombstoneMarker) next; |
| for (int i = 0 ; rtm != null && i < len ; i++) |
| rtm = fs[i].applyToMarker(rtm); |
| next = rtm; |
| } |
| |
| if (next != null) |
| { |
| this.next = next; |
| return true; |
| } |
| } |
| |
| if (stop.isSignalled || stopChild.isSignalled || !hasMoreContents()) |
| return false; |
| } |
| return true; |
| } |
| } |