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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
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* SciJava Common shared library for SciJava software.
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* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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package org.scijava.module.process;
import org.scijava.Context;
import org.scijava.Priority;
import org.scijava.command.Command;
import org.scijava.module.Module;
import org.scijava.module.ModuleInfo;
import org.scijava.module.ModuleItem;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;
/**
* The service preprocessor automatically populates module inputs that implement
* {@link Service}.
*
* Services are obtained from this preprocessor instance's application context.
*
*
* Many modules (e.g., most {@link Command}s) use @{@link Parameter}-annotated
* service fields, resulting in those parameters being populated when the
* SciJava application context is injected (via {@link Context#inject(Object)}.
* However, some modules may have service parameters which are programmatically
* generated (i.e., returned directly as inputs from {@link ModuleInfo#inputs()}
* and as such not populated by context injection. E.g., this situation is the
* case for scripts, since module inputs are parsed from the script header
* rather than declared via the @{@link Parameter} annotation. In such cases, we
* need this service preprocessor to fill in the service values.
*
*
* @author Curtis Rueden
*/
@Plugin(type = PreprocessorPlugin.class, //
priority = 2 * Priority.VERY_HIGH_PRIORITY)
public class ServicePreprocessor extends AbstractPreprocessorPlugin {
// -- ModuleProcessor methods --
@Override
public void process(final Module module) {
for (final ModuleItem input : module.getInfo().inputs()) {
if (!input.isAutoFill()) continue; // cannot auto-fill this input
final Class type = input.getType();
if (Service.class.isAssignableFrom(type)) {
// input is a service
@SuppressWarnings("unchecked")
final ModuleItem serviceInput =
(ModuleItem) input;
setServiceValue(getContext(), module, serviceInput);
}
if (type.isAssignableFrom(getContext().getClass())) {
// input is a compatible context
final String name = input.getName();
module.setInput(name, getContext());
module.resolveInput(name);
}
}
}
// -- Helper methods --
private void setServiceValue(final Context context,
final Module module, final ModuleItem input)
{
final S service = context.getService(input.getType());
input.setValue(module, service);
module.resolveInput(input.getName());
}
}