private static void printOperatorUsage(String name) {
OperationRegistry operationRegistry = JAI.getDefaultInstance().getOperationRegistry();
OperationDescriptor descriptor =
(OperationDescriptor) operationRegistry.getDescriptor(OperationDescriptor.class, name);
if (descriptor == null) {
System.out.println("Unknown operation '" + name + "'");
return;
}
String[][] resources = descriptor.getResources(Locale.getDefault());
String globalName = resources[0][1];
String description = resources[3][1];
String[] sourceNames = descriptor.getSourceNames();
Class[] sourceTypes = descriptor.getSourceClasses("rendered");
ParameterListDescriptor parameterListDescriptor =
descriptor.getParameterListDescriptor("rendered");
String[] paramNames = parameterListDescriptor.getParamNames();
Class[] paramTypes = parameterListDescriptor.getParamClasses();
StringBuilder text = new StringBuilder();
text.append("Usage: ");
text.append(globalName);
text.append('(');
StringBuilder paramListText = new StringBuilder();
if (sourceNames != null) {
for (String sourceName : sourceNames) {
if (paramListText.length() > 0) {
paramListText.append(", ");
}
paramListText.append(sourceName);
}
}
if (paramNames != null) {
for (String paramName : paramNames) {
if (paramListText.length() > 0) {
paramListText.append(", ");
}
paramListText.append(paramName);
Object defaultValue = parameterListDescriptor.getParamDefaultValue(paramName);
if (defaultValue != ParameterListDescriptor.NO_PARAMETER_DEFAULT) {
paramListText.append("=");
paramListText.append(format(defaultValue));
}
}
}
text.append(paramListText);
text.append(')');
text.append('\n');
text.append("Description: ");
text.append(description);
text.append('\n');
text.append("Arguments:\n");
if (sourceNames != null) {
for (int i = 0; i < sourceNames.length; i++) {
String sourceName = sourceNames[i];
Class sourceType = sourceTypes[i];
text.append(" ");
text.append(sourceName);
text.append(": ");
text.append("A source.");
text.append(" (" + sourceType.getName() + ")");
text.append('\n');
}
}
if (paramNames != null) {
for (int i = 0; i < paramNames.length; i++) {
String paramName = paramNames[i];
Class paramType = paramTypes[i];
text.append(" ");
text.append(paramName);
text.append(": ");
text.append(resources[6 + i][1]);
text.append(" (" + paramType.getName() + ")");
text.append('\n');
}
}
System.out.println(text);
}
