import java.
io.
File;
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import java.
lang.
reflect.
Method;
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public class CommandLineProcessor
{');
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public static final String METHOD_SET_FILE =
"setFile";
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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 int m_fileNo =
0;
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public void execute
(String[] args,
Object client
) {');
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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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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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} 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
(client, arg
);
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} else {');
document.write(' argIndex = setOption
(client, optionName, args, argIndex
);
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}');
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} else {');
document.write(' setFile
(client, arg
);
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}');
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}');
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}');
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protected void setFile
(Object client,
String fileName
) {');
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Method method = getMethod
(client, METHOD_SET_FILE,
new Class[] { Integer.
TYPE,
File.
class });
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if (method ==
null) {');
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throw new Exception("Client \'" + client.
getClass().
getName() +
"\' has no method " + METHOD_SET_FILE
);
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}');
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try {');
document.write(' method.
invoke(client,
new Object[] { new Integer(m_fileNo++
),
new File(fileName
) });
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} catch (Throwable t
) {');
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throw new Exception("Error updating file option", t
);
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}');
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}');
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protected int setOption
(Object client,
String optionName,
String[] args,
int argIndex
) {');
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String methodName =
"setOption" + optionName.
substring(0,
1).
toUpperCase() + optionName.
substring(1);
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Method method = getMethod
(client, methodName,
new Class[] { String.
class });
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if (method !=
null) {');
document.write(' invokeOptionSetter
(client, method,
new Object[] { getArg
(optionName, args, argIndex,
"value expected") }, optionName
);
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return argIndex
+1;
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}');
document.write(' method = getMethod
(client, methodName,
new Class[0]);
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if (method !=
null) {');
document.write(' invokeOptionSetter
(client, method,
new Object[0], optionName
);
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return argIndex;
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}');
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throw new Exception("Unexpected option \'" + optionName +
"\'");
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}');
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protected void invokeOptionSetter
(Object client,
Method method,
Object[] args,
String optionName
) {');
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try {');
document.write(' method.
invoke(client, args
);
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} catch (Throwable t
) {');
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throw new Exception("Error updating option \'" + optionName +
"\'", t
);
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}');
document.write('
}');
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protected Method getMethod
(Object client,
String name,
Class[] argTypes
) {');
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Class clazz = client.
getClass();
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try {');
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return clazz.
getMethod(name, argTypes
);
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} catch (NoSuchMethodException nsme
) {');
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return null;
');
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} catch (Throwable t
) {');
document.write('
throw new Exception("Error accessing method " + name +
" of class \'" + clazz.
getName() +
"\'", t
);
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}');
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}');
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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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}');
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return args
[argIndex
];
');
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}');
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protected Exception newException
(String optionName,
String errorMessage
) {');
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return new Exception("Invalid option \'" + optionName +
"\': " + errorMessage
);
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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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}');
document.write('
}');
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.
execute(args, ftpCopy
);
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');
document.write(' ftpCopy.
copy();
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}');
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public static class DummyFtpCopyUtility
{');
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protected boolean appendMode;
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protected String host;
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protected File sourceFile;
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public void setOptionAppend
() {');
document.write(' appendMode =
true;
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}');
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public void setOptionHost
(String value
) {');
document.write(' host = value;
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}');
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public void setFile
(int fileNo,
File value
) {');
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if (fileNo >
1) {');
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throw new CommandLineProcessor.
Exception("Too many files specified. Extra file: \'" + value +
"\'");
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document.write('
}');
document.write(' sourceFile = value;
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document.write('
}');
document.write('
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public void copy
() {');
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if (sourceFile ==
null || host ==
null) {');
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System.
out.
println("Host and source file must be specified");
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} else {');
document.write('
System.
out.
println("About to copy " + sourceFile +
" to " + host
);
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if (appendMode
) {');
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System.
out.
println("Append mode enabled");
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document.write('
}');
document.write('
}');
document.write('
}');
document.write('
}');
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');
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} ');
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