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package org.apache.lucene.benchmark.byTask.tasks;
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* Copyright 2005 The Apache Software Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.benchmark.byTask.PerfRunData;
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import org.apache.lucene.util.Version;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.StringTokenizer;
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import java.lang.reflect.Constructor;
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* Create a new {@link org.apache.lucene.analysis.Analyzer} and set it it in the getRunData() for use by all future tasks.
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public class NewAnalyzerTask extends PerfTask {
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private List<String> analyzerClassNames;
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public NewAnalyzerTask(PerfRunData runData) {
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analyzerClassNames = new ArrayList<String>();
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public static final Analyzer createAnalyzer(String className) throws Exception{
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final Class<? extends Analyzer> clazz = Class.forName(className).asSubclass(Analyzer.class);
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// first try to use a ctor with version parameter (needed for many new Analyzers that have no default one anymore
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Constructor<? extends Analyzer> cnstr = clazz.getConstructor(Version.class);
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return cnstr.newInstance(Version.LUCENE_CURRENT);
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} catch (NoSuchMethodException nsme) {
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// otherwise use default ctor
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return clazz.newInstance();
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public int doLogic() throws IOException {
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String className = null;
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if (current >= analyzerClassNames.size())
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className = analyzerClassNames.get(current++);
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if (className == null || className.equals(""))
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className = "org.apache.lucene.analysis.standard.StandardAnalyzer";
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if (className.indexOf(".") == -1 || className.startsWith("standard."))//there is no package name, assume o.a.l.analysis
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className = "org.apache.lucene.analysis." + className;
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getRunData().setAnalyzer(createAnalyzer(className));
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System.out.println("Changed Analyzer to: " + className);
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} catch (Exception e) {
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throw new RuntimeException("Error creating Analyzer: " + className, e);
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* Set the params (analyzerClassName only), Comma-separate list of Analyzer class names. If the Analyzer lives in
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* org.apache.lucene.analysis, the name can be shortened by dropping the o.a.l.a part of the Fully Qualified Class Name.
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* Example Declaration: {"NewAnalyzer" NewAnalyzer(WhitespaceAnalyzer, SimpleAnalyzer, StopAnalyzer, standard.StandardAnalyzer) >
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* @param params analyzerClassName, or empty for the StandardAnalyzer
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public void setParams(String params) {
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super.setParams(params);
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for (StringTokenizer tokenizer = new StringTokenizer(params, ","); tokenizer.hasMoreTokens();) {
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String s = tokenizer.nextToken();
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analyzerClassNames.add(s.trim());
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* @see org.apache.lucene.benchmark.byTask.tasks.PerfTask#supportsParams()
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public boolean supportsParams() {