| /* |
| * 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.index.sasi.analyzer.filter; |
| |
| /** |
| * A single task or set of work to process an input |
| * and return a single output. Maintains a link to the |
| * next task to be executed after itself |
| */ |
| public abstract class FilterPipelineTask<F, T> |
| { |
| private String name; |
| public FilterPipelineTask<?, ?> next; |
| |
| protected <K, V> void setLast(String name, FilterPipelineTask<K, V> last) |
| { |
| if (last == this) |
| throw new IllegalArgumentException("provided last task [" + last.name + "] cannot be set to itself"); |
| |
| if (this.next == null) |
| { |
| this.next = last; |
| this.name = name; |
| } |
| else |
| { |
| this.next.setLast(name, last); |
| } |
| } |
| |
| public abstract T process(F input) throws Exception; |
| |
| public String getName() |
| { |
| return name; |
| } |
| } |