import java.
util.
Map;
');
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import java.
util.
HashMap;
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import java.
io.
File;
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');
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public class CommandLineProcessor
{');
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');
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public static final String ARG_PREFIX1 =
"--";
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public static final String ARG_PREFIX2 =
"//";
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protected Map m_optionExtractors =
new HashMap();
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protected FileOption m_fileSetter =
null;
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protected int m_fileIndex =
0;
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');
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public void registerOption
(String optionName,
Option handler
) {');
document.write(' addExtractor
(optionName,
new OptionExtractor
(handler
));
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}');
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public void registerOption
(String optionName, StringOption handler
) {');
document.write(' addExtractor
(optionName,
new StringOptionExtractor
(handler
));
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}');
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');
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public void registerFiles
(FileOption handler
) {');
document.write(' m_fileSetter = handler;
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}');
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public void registerOption
(String optionName, IntOption handler
) {');
document.write(' addExtractor
(optionName,
new IntOptionExtractor
(handler
));
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}');
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');
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public void execute
(String[] args
) {');
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boolean optionsAllowed =
true;
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int argIndex =
0;
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while (argIndex < args.
length) {');
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String arg = args
[argIndex++
];
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if (optionsAllowed
) {');
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if (ARG_PREFIX1.
equals(arg
) || ARG_PREFIX2.
equals(arg
)) {');
document.write(' optionsAllowed =
false;
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document.write('
continue;
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}');
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String optionName;
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if (arg.
startsWith(ARG_PREFIX1
)) {');
document.write(' optionName = arg.
substring(ARG_PREFIX1.
length());
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document.write('
} else if (arg.
startsWith(ARG_PREFIX2
)) {');
document.write(' optionName = arg.
substring(ARG_PREFIX2.
length());
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} else {');
document.write(' optionName =
null;
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}');
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if (optionName ==
null) {');
document.write(' setFile
(arg
);
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} else {');
document.write(' Extractor extractor =
(Extractor
) m_optionExtractors.
get(optionName
);
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if (extractor ==
null) {');
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throw new Exception("Unexpected option \'" + optionName +
"\'");
');
document.write('
}');
document.write(' argIndex = extractor.
execute(optionName, args, argIndex
);
');
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}');
document.write('
} else {');
document.write(' setFile
(arg
);
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}');
document.write('
}');
document.write('
}');
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');
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protected void setFile
(String value
) {');
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if (m_fileSetter ==
null) {');
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throw new Exception("Unexpected file name: \'" + value +
"\'");
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document.write('
}');
document.write(' m_fileSetter.
execute(++m_fileIndex,
new File(value
));
');
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}');
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protected void addExtractor
(String optionName, Extractor extractor
) {');
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if (m_optionExtractors.
containsKey(optionName
)) {');
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throw new Exception("Duplicated option name: \'" + optionName +
"\'");
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document.write('
}');
document.write(' m_optionExtractors.
put(optionName, extractor
);
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}');
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public static class Exception extends java.
lang.
RuntimeException {');
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public Exception (String message
) {');
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super(message
);
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}');
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public Exception (String message,
Throwable nested
) {');
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super(message,nested
);
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}');
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}');
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public interface Option {');
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void execute
(String option
) throws Exception;
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}');
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public interface StringOption
{');
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void execute
(String option,
String value
) throws Exception;
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}');
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public interface IntOption
{');
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void execute
(String option,
int value
) throws Exception;
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}');
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public interface FileOption
{');
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void execute
(int fileNo,
File value
) throws Exception;
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document.write('
}');
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protected abstract class Extractor
{');
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public abstract int execute
(String optionName,
String[] args,
int argIndex
) throws Exception;
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protected String getArg
(String optionName,
String[] args,
int argIndex,
String errorMessage
) {');
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if (argIndex >= args.
length) {');
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throw newException
(optionName, errorMessage
);
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document.write('
}');
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return args
[argIndex
];
');
document.write('
}');
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protected Exception newException
(String optionName,
String errorMessage
) {');
document.write('
return new Exception("Invalid option \'" + optionName +
"\': " + errorMessage
);
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}');
document.write('
');
document.write('
}');
document.write('
');
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protected class OptionExtractor
extends Extractor
{');
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protected Option m_handler;
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public OptionExtractor
(Option handler
) {');
document.write(' m_handler = handler;
');
document.write('
}');
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public int execute
(String optionName,
String[] args,
int argIndex
) {');
document.write(' m_handler.
execute(optionName
);
');
document.write('
return argIndex;
');
document.write('
}');
document.write('
}');
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');
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protected class StringOptionExtractor
extends Extractor
{');
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protected StringOption m_handler;
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public StringOptionExtractor
(StringOption handler
) {');
document.write(' m_handler = handler;
');
document.write('
}');
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public int execute
(String optionName,
String[] args,
int argIndex
) {');
document.write(' m_handler.
execute(optionName, getArg
(optionName, args, argIndex,
"string value expected"));
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document.write('
return argIndex +
1;
');
document.write('
}');
document.write('
}');
document.write('
');
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protected class IntOptionExtractor
extends Extractor
{');
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protected IntOption m_handler;
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public IntOptionExtractor
(IntOption handler
) {');
document.write(' m_handler = handler;
');
document.write('
}');
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public int execute
(String optionName,
String[] args,
int argIndex
) {');
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String textValue = getArg
(optionName, args, argIndex,
"integer value expected");
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int value;
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try {');
document.write(' value =
Integer.
parseInt(textValue
);
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} catch (Throwable t
) {');
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throw newException
(optionName,
"Invalid int argument");
');
document.write('
}');
document.write(' m_handler.
execute(optionName, value
);
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return argIndex +
1;
');
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}');
document.write('
}');
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} import java.
io.
File;
');
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public class Test
{');
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public static void main
(String[] args
) throws Exception {');
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final DummyFtpCopyUtility ftpCopy =
new DummyFtpCopyUtility
();
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');
document.write(' CommandLineProcessor clp =
new CommandLineProcessor
();
');
document.write(' clp.
registerOption("append",
new CommandLineProcessor.
Option() {');
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public void execute
(String option
) {');
document.write(' ftpCopy.
appendMode =
true;
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}');
document.write('
});
');
document.write(' clp.
registerOption("host",
new CommandLineProcessor.
StringOption() {');
document.write('
public void execute
(String option,
String value
) {');
document.write(' ftpCopy.
host = value;
');
document.write('
}');
document.write('
});
');
document.write(' clp.
registerOption("maxSize",
new CommandLineProcessor.
IntOption() {');
document.write('
public void execute
(String option,
int value
) {');
document.write(' ftpCopy.
maxFileSize = value;
');
document.write('
}');
document.write('
});
');
document.write(' clp.
registerFiles(new CommandLineProcessor.
FileOption() {');
document.write('
public void execute
(int fileNo,
File value
) {');
document.write('
if (fileNo >
1) {');
document.write('
throw new CommandLineProcessor.
Exception("Too many files specified. Extra file: \'" + value +
"\'");
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document.write('
}');
document.write(' ftpCopy.
sourceFile = value;
');
document.write('
}');
document.write('
});
');
document.write(' clp.
execute(args
);
');
document.write('
');
document.write(' ftpCopy.
copy();
');
document.write('
}');
document.write('
');
document.write('
public static class DummyFtpCopyUtility
{');
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protected boolean appendMode;
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protected String host;
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protected int maxFileSize =
0;
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protected File sourceFile;
');
document.write('
');
document.write('
public void copy
() {');
document.write('
if (sourceFile ==
null || host ==
null) {');
document.write('
System.
out.
println("Host and source file must be specified");
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document.write('
} else {');
document.write('
System.
out.
println("About to copy " + sourceFile +
" to " + host
);
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document.write('
if (appendMode
) {');
document.write('
System.
out.
println("Append mode enabled");
');
document.write('
}');
document.write('
if (maxFileSize >
0) {');
document.write('
System.
out.
println("Max file size: " + maxFileSize
);
');
document.write('
}');
document.write('
}');
document.write('
}');
document.write('
}');
document.write('
');
document.write('
} java -cp . Test --host localhost Foobar.txt
');
document.write('java -cp . Test --host localhost Foobar.txt --append
');
document.write('java -cp . Test --host localhost Foobar.txt --append --maxSize 1024
');
document.write('java -cp . Test --host localhost --append --maxSize 1024 -- --Foo--
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document.write('