/**
* 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.solr.update.processor;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.util.plugin.PluginInfoInitialized;
import org.apache.solr.core.PluginInfo;
import org.apache.solr.core.SolrCore;
import java.util.List;
/**
* Manages a chain of UpdateRequestProcessorFactories.
* <p>
* Chain can be configured via solrconfig.xml:
* </p>
* <pre>
* <updateRequestProcessors name="key" default="true">
* <processor class="PathToClass1" />
* <processor class="PathToClass2" />
* <processor class="solr.LogUpdateProcessorFactory" >
* <int name="maxNumToLog">100</int>
* </processor>
* <processor class="solr.RunUpdateProcessorFactory" />
* </updateRequestProcessors>
* </pre>
*
* @see UpdateRequestProcessorFactory
* @since solr 1.3
*/
public final class UpdateRequestProcessorChain implements PluginInfoInitialized
{
private UpdateRequestProcessorFactory[] chain;
private final SolrCore solrCore;
public UpdateRequestProcessorChain(SolrCore solrCore) {
this.solrCore = solrCore;
}
public void init(PluginInfo info) {
List<UpdateRequestProcessorFactory> list = solrCore.initPlugins(info.getChildren("processor"),UpdateRequestProcessorFactory.class,null);
if(list.isEmpty()){
throw new RuntimeException( "updateRequestProcessorChain require at least one processor");
}
chain = list.toArray(new UpdateRequestProcessorFactory[list.size()]);
}
public UpdateRequestProcessorChain( UpdateRequestProcessorFactory[] chain , SolrCore solrCore) {
this.chain = chain;
this.solrCore = solrCore;
}
public UpdateRequestProcessor createProcessor(SolrQueryRequest req, SolrQueryResponse rsp)
{
UpdateRequestProcessor processor = null;
UpdateRequestProcessor last = null;
for (int i = chain.length-1; i>=0; i--) {
processor = chain[i].getInstance(req, rsp, last);
last = processor == null ? last : processor;
}
return last;
}
public UpdateRequestProcessorFactory[] getFactories() {
return chain;
}
}