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Java API for XML Processing Reference Implementation
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/*
* $Id: GetOpt.java,v 1.10 2010-11-01 04:34:14 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.cmdline.getopt;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
/**
* GetOpt is a Java equivalent to the C getopt() library function
* discussed in man page getopt(3C). It provides command line
* parsing for Java applications. It supports the most rules of the
* command line standard (see man page intro(1)) including stacked
* options such as '-sxm' (which is equivalent to -s -x -m); it
* handles special '--' option that signifies the end of options.
* Additionally this implementation of getopt will check for
* mandatory arguments to options such as in the case of
* '-d ' it will throw a MissingOptArgException if the
* option argument '' is not included on the commandline.
* getopt(3C) does not check for this.
* @author G Todd Miller
*/
public class GetOpt{
public GetOpt(String[] args, String optString){
theOptions = new ArrayList();
int currOptIndex = 0;
theCmdArgs = new ArrayList();
theOptionMatcher = new OptionMatcher(optString);
// fill in the options list
for(int i=0; i 2){
// stacked options found, such as '-shm'
// iterate thru the tokens after the dash and
// add them to theOptions list
for(int j=1; j', if current option parsed is 'd' then
* getOptionArg() would return ''.
* @return String - argument for current parsed option.
* @param none
*/
public String getOptionArg(){
String retval = null;
String tmp = theCurrentOption.getArgument();
char c = theCurrentOption.getArgLetter();
if(theOptionMatcher.hasArg(c)){
retval = tmp;
}
return retval;
}
/**
* gets list of the commandline arguments. For example, in command
* such as 'cmd -s -d file file2 file3 file4' with the usage
* 'cmd [-s] [-d ] ...', getCmdArgs() would return
* the list {file2, file3, file4}.
* @return String[] - list of command arguments that may appear
* after options and option arguments.
* @params none
*/
public String[] getCmdArgs(){
String[] retval = new String[theCmdArgs.size()];
int i=0;
for(ListIterator it=theCmdArgs.listIterator(); it.hasNext();){
retval[i++] = (String)it.next();
}
return retval;
}
private Option theCurrentOption = null;
private ListIterator theOptionsIterator;
private List theOptions = null;
private List theCmdArgs = null;
private OptionMatcher theOptionMatcher = null;
///////////////////////////////////////////////////////////
//
// Inner Classes
//
///////////////////////////////////////////////////////////
// inner class to model an option
class Option{
private char theArgLetter;
private String theArgument = null;
public Option(char argLetter) { theArgLetter = argLetter; }
public void setArg(String arg) {
theArgument = arg;
}
public boolean hasArg() { return (theArgument != null); }
public char getArgLetter() { return theArgLetter; }
public String getArgument() { return theArgument; }
} // end class Option
// inner class to query optString for a possible option match,
// and whether or not a given legal option takes an argument.
//
class OptionMatcher{
public OptionMatcher(String optString){
theOptString = optString;
}
public boolean match(char c){
boolean retval = false;
if(theOptString.indexOf(c) != -1){
retval = true;
}
return retval;
}
public boolean hasArg(char c){
boolean retval = false;
int index = theOptString.indexOf(c)+1;
if (index == theOptString.length()){
// reached end of theOptString
retval = false;
}
else if(theOptString.charAt(index) == ':'){
retval = true;
}
return retval;
}
private String theOptString = null;
} // end class OptionMatcher
}// end class GetOpt