| /* |
| * 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.uima.analysis_engine.impl; |
| |
| import org.apache.uima.analysis_engine.AnalysisEngineProcessException; |
| import org.apache.uima.analysis_engine.metadata.FixedFlow; |
| import org.apache.uima.analysis_engine.metadata.FlowConstraints; |
| import org.apache.uima.cas.CAS; |
| import org.apache.uima.flow.CasFlowController_ImplBase; |
| import org.apache.uima.flow.CasFlow_ImplBase; |
| import org.apache.uima.flow.FinalStep; |
| import org.apache.uima.flow.Flow; |
| import org.apache.uima.flow.FlowControllerContext; |
| import org.apache.uima.flow.SimpleStep; |
| import org.apache.uima.flow.Step; |
| import org.apache.uima.resource.ResourceInitializationException; |
| |
| /** |
| * Test FlowController that drops any segment whose document text is "DROP". Otherwise uses linear |
| * flow. |
| */ |
| public class SegmentDroppingFlowController extends CasFlowController_ImplBase { |
| String[] mSequence; |
| |
| public void initialize(FlowControllerContext aContext) throws ResourceInitializationException { |
| super.initialize(aContext); |
| FlowConstraints flowConstraints = aContext.getAggregateMetadata().getFlowConstraints(); |
| mSequence = ((FixedFlow) flowConstraints).getFixedFlow(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.apache.uima.flow.CasFlowController_ImplBase#computeFlow(org.apache.uima.cas.CAS) |
| */ |
| public Flow computeFlow(CAS aCAS) throws AnalysisEngineProcessException { |
| FixedFlowObject ffo = new FixedFlowObject(aCAS, 0); |
| ffo.setCas(aCAS); |
| return ffo; |
| } |
| |
| class FixedFlowObject extends CasFlow_ImplBase { |
| private int currentStep; |
| |
| private boolean wasSegmented = false; |
| |
| /** |
| * Create a new fixed flow starting at step <code>startStep</code> of the fixed sequence. |
| * |
| * @param cas |
| * aCAS |
| * |
| * @param startStep |
| * index of mSequence to start at |
| */ |
| public FixedFlowObject(CAS cas, int startStep) { |
| setCas(cas); |
| currentStep = startStep; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.apache.uima.flow.Flow#next() |
| */ |
| public Step next() throws AnalysisEngineProcessException { |
| // drop any segment whose document text is "DROP" |
| if ("DROP".equals(getCas().getCurrentView().getDocumentText())) { |
| return new FinalStep(true); |
| } |
| |
| if (currentStep >= mSequence.length) { |
| return new FinalStep(); // this CAS has finished the sequence |
| } |
| // If CAS was segmented, do not continue with flow. The individual segments |
| // are processed further but the original CAS is not. |
| if (wasSegmented) { |
| return new FinalStep(); |
| } |
| |
| // otherwise, we just send the CAS to the next AE in sequence. |
| return new SimpleStep(mSequence[currentStep++]); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.apache.uima.flow.CasFlow_ImplBase#newCasProduced(CAS, String) |
| */ |
| public Flow newCasProduced(CAS newCas, String producedBy) throws AnalysisEngineProcessException { |
| // record that the input CAS has been segmented (affects its subsequent flow) |
| wasSegmented = true; |
| // start the new segment CAS from the next node after the Segmenter that produced it |
| int i = 0; |
| while (!mSequence[i].equals(producedBy)) |
| i++; |
| return new FixedFlowObject(newCas, i + 1); |
| } |
| } |
| } |