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add command line parameter parser function. #1

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29 changes: 29 additions & 0 deletions src/main/java/DojoMain.java
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package com.liucj.learn.meetup;

import java.util.Arrays;

public class DojoMain {
public static void main(String[] args) {

System.out.println("args is:");
System.out.println(Arrays.toString(args));

System.out.println();
System.out.println("init parameter starting...");
ParameterParser.parser(args);

System.out.println();
System.out.println("process is starting...");
Thread demoThread = new Thread(new ServiceDemo());
demoThread.start();

try {
demoThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}

System.out.println();
System.out.println("process ended.");
}
}
105 changes: 105 additions & 0 deletions src/main/java/ParameterParser.java
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package com.liucj.learn.meetup;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class ParameterParser {
public static final String PARAMETER_L = "l";
public static final String PARAMETER_P = "p";
public static final String PARAMETER_D = "d";

public static HashMap<String, ParameterType> parametersConfig = new HashMap<>();
public static ConcurrentMap<String, Object> parameters = new ConcurrentHashMap<String, Object>();

static {
parametersConfig.put(PARAMETER_L, new ParameterType(PARAMETER_L, true, String.class.getSimpleName()));
parametersConfig.put(PARAMETER_P, new ParameterType(PARAMETER_P, false, Integer.class.getSimpleName()));
parametersConfig.put(PARAMETER_D, new ParameterType(PARAMETER_D, false, String.class.getSimpleName()));

parameters.put(PARAMETER_L,Boolean.valueOf(false));
parameters.put(PARAMETER_P,Integer.valueOf(0));
parameters.put(PARAMETER_D, "");
}

public static void parser(String[] args) {
List<String> argList = Arrays.asList(args);
// System.out.println("args is:");
// argList.forEach(System.out::println);
Iterator<String> it = argList.iterator();
boolean getNext = true;
String key = null;
String parameter = null;
String value = null;
while (it.hasNext()) {
if (getNext) {
key = it.next();
}
getNext = true;
parameter = key;
if (parameter.startsWith("-")) {
parameter = parameter.substring(1);
if (parametersConfig.containsKey(parameter)) {
// System.out.println("init parameter for " + parameter);
if (it.hasNext()) {
value = it.next();
if (!value.startsWith("-")) {
if (parametersConfig.get(parameter).isPosition()) {
System.out.println("parameter " + parameter + " don't need a value!");
System.exit(-1);
} else {
if (parametersConfig.get(parameter).getType().equals(String.class.getSimpleName())) {
parameters.put(parameter, (String) value);
} else if (parametersConfig.get(parameter).getType().equals(Integer.class.getSimpleName())) {
parameters.put((parameter), Integer.valueOf(value));
} else {
parameters.put(parameter, value);
}
System.out.println("init parameter:"+parameter+ " using value:"+value);
}
} else {
key = value;
if (parametersConfig.get(parameter).isPosition()) {
parameters.put(parameter, Boolean.valueOf(true));
System.out.println("init parameter:"+parameter+ " using value:true");
getNext = false;
} else {
System.out.println("parameter " + parameter + " must hava a value!");
System.exit(-1);
}
}
} else {
if (parametersConfig.get(parameter).isPosition()) {
parameters.put(parameter, Boolean.valueOf(true));
System.out.println("init parameter:"+parameter+ " using value:true");
} else {
System.out.println("parameter " + parameter + " must hava a value!");
System.exit(-1);
}
}
} else {
System.out.println("parameter error,parameter " + parameter + " is not valid!");
System.exit(-1);
}
} else {
System.out.println("parameter error,parameter " + parameter + " must start with - !");
System.exit(-1);
}
}
}

public static boolean getParameterL() {
return (Boolean) parameters.get(PARAMETER_L);
}

public static int getParameterP() {
return (int) parameters.get(PARAMETER_P);
}

public static String getParameterD() {
return (String) parameters.get(PARAMETER_D);
}
}
39 changes: 39 additions & 0 deletions src/main/java/ParameterType.java
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package com.liucj.learn.meetup;

import java.lang.reflect.Type;

public class ParameterType {
public String name;
public boolean position;
public String type;

public ParameterType(String name, boolean position, String type) {
this.name = name;
this.position = position;
this.type = type;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public boolean isPosition() {
return position;
}

public void setPosition(boolean position) {
this.position = position;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}
}
25 changes: 25 additions & 0 deletions src/main/java/ServiceDemo.java
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package com.liucj.learn.meetup;

public class ServiceDemo implements Runnable {
@Override
public void run() {
if (ParameterParser.getParameterL()) {
System.out.println("parameter " + ParameterParser.PARAMETER_L + " is true");
} else {
System.out.println("parameter " + ParameterParser.PARAMETER_L + " is false");
}

if (ParameterParser.getParameterP() != 0) {
System.out.println("parameter " + ParameterParser.PARAMETER_P + " is " + ParameterParser.getParameterP());
} else {
System.out.println("parameter " + ParameterParser.PARAMETER_P + " is default value 0");
}

if (ParameterParser.getParameterD() == null ||
ParameterParser.getParameterD().equals("")) {
System.out.println("parameter " + ParameterParser.PARAMETER_D + " is default value blank");
}else {
System.out.println("parameter " + ParameterParser.PARAMETER_D + " is " + ParameterParser.getParameterD());
}
}
}