/*
* 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;
}
}