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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.solr.update.processor;
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import java.io.IOException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.apache.solr.update.AddUpdateCommand;
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import org.apache.solr.update.CommitUpdateCommand;
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import org.apache.solr.update.DeleteUpdateCommand;
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import org.apache.solr.update.MergeIndexesCommand;
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import org.apache.solr.update.RollbackUpdateCommand;
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* This is a good place for subclassed update handlers to process the document before it is
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* indexed. You may wish to add/remove fields or check if the requested user is allowed to
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* update the given document...
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* Perhaps you continue adding an error message (without indexing the document)...
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* perhaps you throw an error and halt indexing (remove anything already indexed??)
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* By default, this just passes the request to the next processor in the chain.
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public abstract class UpdateRequestProcessor {
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protected final Logger log = LoggerFactory.getLogger(getClass());
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protected final UpdateRequestProcessor next;
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public UpdateRequestProcessor( UpdateRequestProcessor next) {
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public void processAdd(AddUpdateCommand cmd) throws IOException {
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if (next != null) next.processAdd(cmd);
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public void processDelete(DeleteUpdateCommand cmd) throws IOException {
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if (next != null) next.processDelete(cmd);
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public void processMergeIndexes(MergeIndexesCommand cmd) throws IOException {
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if (next != null) next.processMergeIndexes(cmd);
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public void processCommit(CommitUpdateCommand cmd) throws IOException
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if (next != null) next.processCommit(cmd);
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public void processRollback(RollbackUpdateCommand cmd) throws IOException
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if (next != null) next.processRollback(cmd);
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public void finish() throws IOException {
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if (next != null) next.finish();