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package eu.dnetlib.dhp.common.java;
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import java.lang.reflect.Constructor;
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import org.apache.commons.cli.CommandLine;
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/**
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* Handles parsing the command line arguments provided by the Oozie
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* to create a {@link Process}
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* @author Mateusz Kobos
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*
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*/
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public class CmdLineParserForProcessConstruction {
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public Process run(CommandLine cmdLine){
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String[] args = cmdLine.getArgs();
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if(args.length != 1){
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throw new CmdLineParserException("The name of the class has "+
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"to be specified as the first agrument");
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}
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String className = args[0];
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String[] constructorParams = cmdLine.getOptionValues(
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CmdLineParser.constructorPrefix);
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if(constructorParams == null){
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constructorParams = new String[0];
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}
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try {
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Class<?> processClass = Class.forName(className);
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Constructor<?> processConstructor = null;
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if(constructorParams.length == 0){
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try{
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processConstructor = processClass.getConstructor();
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return (Process) processConstructor.newInstance();
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} catch(NoSuchMethodException ex){
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}
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}
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processConstructor = processClass.getConstructor(String[].class);
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return (Process) processConstructor.newInstance(
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(Object)constructorParams);
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} catch (Exception e) {
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throw new CmdLineParserException(String.format(
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"Problem while creating class \"%s\"", className), e);
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}
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}
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}
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