/* Copyright (c) 2008 Google Inc.
*
* Licensed 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 sample.util;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* A simple class that provides utilities to ease command line parsing.
*
*
*/
public class SimpleCommandLineParser {
private Map<String,String> argMap;
/**
* Initializes the command line parser by parsing the command line
* args using simple rules.
* <p>
* The arguments are parsed into keys and values and are saved into
* a HashMap. Any argument that begins with a '--' or '-' is assumed
* to be a key. If the following argument doesn't have a '--'/'-' it
* is assumed to be a value of the preceding argument.
*/
public SimpleCommandLineParser(String[] arg) {
argMap = new HashMap<String,String>();
for (int i = 0; i < arg.length ; i++) {
String key;
if (arg[i].startsWith("--")) {
key = arg[i].substring(2);
} else if(arg[i].startsWith("-")) {
key = arg[i].substring(1);
} else {
argMap.put(arg[i], null);
continue;
}
String value;
int index = key.indexOf('=');
if (index == -1) {
if (((i+1) < arg.length) &&
(arg[i+1].charAt(0) != '-')) {
argMap.put(key, arg[i+1]);
i++;
} else {
argMap.put(key, null);
}
} else {
value = key.substring(index+1);
key = key.substring(0, index);
argMap.put(key, value);
}
}
}
/**
* Returns the value of the first key found in the map.
*/
public String getValue(String ... keys) {
for(int key_i = 0; key_i < keys.length; key_i++) {
if(argMap.get(keys[key_i]) != null) {
return argMap.get(keys[key_i]);
}
}
return null;
}
/**
* Returns true if any of the given keys are present in the map.
*/
public boolean containsKey(String ... keys) {
Set<String> keySet = argMap.keySet();
for (Iterator<String> keysIter = keySet.iterator(); keysIter.hasNext();) {
String key = keysIter.next();
for (int key_i = 0; key_i < keys.length; key_i++) {
if (key.equals(keys[key_i])) {
return true;
}
}
}
return false;
}
}